News

water treatment fair Holland Gorinchem Event Hall

Aqua Nederland 2018 - Gorinchem Event Halls - March 13, 14 and 15

Visit us at stand J112 (Task Läckeby) at the Aqua Nederland fair at the Gorinchem Event halls on March 13, 14 and 15, 2018. Have a closer look at our Läckeby sludge/sludge and sludge/water heat exchangers, and at our well-known Roto-Sieve drum screens range (full scales on the stand).

Were? Gorinchem Event Halls Franklinweg 2, 4207 HZ Gorinchem, The Netherlands - stand J112.

Opening hours: Tuesday March 13, Wednesday March 14, Thursday March 15: daily from 10 to 18 h.

Download your free e-ticket through this link (entrance is free for 2)

Aqua Nederland 2017 Gorinchem

Aqua Nederland 2017 - Gorinchem Event Halls - March 21, 22 and 23

Visit us at stand 198 (Task Läckeby) at the Aqua Nederland fair at the Gorinchem Event halls on March 21, 22 and 23, 2017. This year, we're focusing on the Läckeby sludge/sludge and sludge/water heat exchangers, next to our well-known Roto-Sieve drum screens range (full scales on the stand).

Were? Evenementenhal Franklinweg 2, 4207 HZ Gorinchem, the Netherlands - stand 198.

Opening hours: Tuesday March 21, Wednesday March 22, Thursday March 23: daily from 12 to 20 h.

Download your free e-ticket through this link (entrance is free for 2)

wastewater reuse reverse osmosis after membrane bioreactor

Wastewater reuse industrial - RO after MBR

Special techniques : advanced wastewater reuse – combined RO (reverse osmosis) and MBR (membrane bio reactors) installation – cost saving measures

Water is getting more and more expensive anywhere in the world. Companies are paying more and more for waste water disposal. This is leading to an increasing demand for reuse of waste water, certainly for the big water consumers, such as slaughter houses, laundries, food and beverage industry, cosmetic industry, textile industry, etc.).

Inserting a RO installation in addition to a MBR unit, is allowing to reuse a substantial part of the wastewater (approx. 60 to 80 %) in the production process. For the companies concerned the savings on water supply and wastewater disposal are considerable, allowing to recover the investment relatively soon. Knowing that water cost will continue to increase for companies all over the world, measures taken to reduce this water cost to the maximum are absolutely crucial. The exploitation cost for such a combined RO – MBR installation, according to the customer’s specific needs, can e.g. only represent a third of the cost of city water.

For each specific project there is a previous feasibility check, by means of performance and dimensioning test on site. Whenever appropriate a test installation is installed for a lost check-up. The final full scale installation is entirely custom-made, in function of the wastewater type, the aimed quality for reuse and taking into account the economic aspects of the project. The MBR unit in container, as well as the RO unit mounted on skid, come as compact entities, easy to integrate in an existing water treatment environment. The RO installation is fully automated and completely remote controlled.

We dispose of 30 years of knowhow in the field of membrane technology and can present four specific references so far (at the end of 2015 to first installation has been put into service successfully, 3 more installations are to follow at the beginning of 2016).

More information in the water section - membrane filtration

Task Environmental Engineering at the Aqua Netherlands fair

Aqua Nederland 2016 - Gorinchem Event halls - March 15, 16 and 17, 2016

Visit us at stand 242 (Task Läckeby Products) at the Aqua Nederland fair at the Gorinchem Event halls on March 15, 16 and 17, 2016. We are exhibiting the Roto-Sieve rotating drum screens and the Läckeby Products sludge/sludge and sludge/water heat exchangers.

Where? Evenementenhal Franklinweg 2, 4207 HZ Gorinchem, Nederland - stand 242

Opening hours: Tuesday March 15, Wednesday March 16, Thursday March 17: daily from 12 to 20 h

Download your free e-ticket through this link

Wet gas scrubbing in emission treatment compared to other methods of emission treatment

In the field of air pollution control several techniques are at our disposal : gas scrubbing (physical, chemical), biofiltration, bioscrubbing, biotricklingfiltration, activated carbon filtration and post combustion (thermal – catalytic). Obviously, every method has its own application area, advantages as well as disadvantages, all at a different cost, depending on the circumstances.

Gas scrubbing

The base product for gas scrubbing is usually water, with or without additional chemicals. It's a relatively simple process, which, in contradiction to biological processes, is well controllable. Gas scrubbing can be used for small as well as for quite big air flows and when the pollutants are well soluble in water, such as HCl, NH3, alcohols …. Oxidative scrubbers, usually treating the pollutants (among others mercaptans) by means of sodium hypochlorite or hydrogen peroxide are also frequently used. A gas scrubber can take a relatively high charge of scrubbing water and gas, still maintaining an acceptable energy level. Furthermore, the cleaning process can be executed in a relatively compact shape. Single waste gas treatment can be done in a counterflow scrubber. For airflows exceeding 80.000 -100.000 m³/h a crossflow scrubber will usually be more appropriate. Airflows requiring a multiple treatment will preferrably be sent through a multistage cross and/or counterflow scrubber, which - logically - will have a compact and cost advantageous construction. Gas scrubbers are most often made of synthetic material due to the aggressivity of the pollutants and the chemicals used. Stainless steel scrubbers will also be used, but less frequently.

Gas scrubbing processes can perfectly be followed by monitoring parameters such as pH, rH, conductivity, gasdetection, flow,…. Gas scrubbing processes can be exactly controlled. Performance is predictable and guaranteed.

It is very difficult to specify in which cases gas scrubbing can be used, but it certainly isn't exagerated to put that in certainly 40-60 % of the cases gas scrubbing will be the best solution. Gas scrubbers will always be “custom made” and adapted to construction site situation and circumstances. Furthermore in most of the cases the polluting circumstances will not allow a commonplace and standardized solution. Most often, specialised advice regarding measurements and pilot plant testing is required. Pilot plant information is quite simple to inter- or extrapolate in order to obtain a reliable operational system. Disregarding such advice will certainly increase the risk of a mis-investment. Dedicating 10 % of the forecasted investment to preliminary investigations will always be a responsible decision in order to optimize the performance of the total investment.

Advantages of wet gas scrubbing :

  • relatively simple and well controllable - also for bigger gas volumes to be treated
  • low energy consumption
  • compact - space saving
  • predictable and guaranteed performance

Activated carbon filtration

Activated carbon filtration is a so-called  adsorption technique, allowing the activated carbon to adsorb the pollutants present in the emission flow. This emission treatment method will be frequently used to eliminate solvents from waste gas. The necessary installations vary from quite simple to more complex, according to the present explosion or fire risks. Usually the activated carbon saturated with pollutants will be collected by an authorized waste collector and recycled or incinerated. In some cases the activated carbon will be recycled at site, frequently with steam. About 10-20 % of the waste gas can be treated with activated carbon filtration.

Post combustion

Post combustion is a very effective method, leaving in most cases only a remainder of carbon dioxide and water, but it is unsuitable for most anorganic pollutants. In all cases where hydrochloric acid and/or sulphur dioxide are part of the combustion products, an ulterior wet scrubbing will be necessary. The risk of explosion is basically always present at any combustion process. Post combustion can be very expensive when there is no possibility of heat reclycing and/or use of a catalyst. At an autotherm process the energy consumption will be low to very low. Post combustion will also be rather expensive at air flows larger than 5.000 m³/hour. For an estimate of 5% of the cases post combustion will be appropriate.

Biological emission treatment

Very well known are biofilters used for odour control. These biofilters are to be run and maintained very carefully. Recent development in connection to biofilters are among others the universal use of synthetic material, a special inoculated biomass, the addition of moderators and a good preliminary treatment and humidification. Bioscrubbers are often used in combination with an activated sludge basin in waste water treatment. The biotricklingfilter is another version of the biofilter, allowing a better control of the process by adding nutrients and by a pH correction of the circulating humidification water. The pollutants to remove with this equipment have to be well soluble in water and biologically decomposable in a reasonably short period. The eliminative performance of biological systems is an elastic notion and strongly depends upon circumstances such as : charges, temperature, humidity, biological decomposition... These so-called microbiological treatment techniques remain rather sensitive and in many cases difficult to control. At the start up and after a calamity a considerable readaptation period of the microbiology has to be taken into account. For certain agricultural applications (such as composting) biofilters are a very succesful solution. In approximately 15 % of the cases biological systems will be used.

Multidisciplinar approach

A pollution problem caused by industrial emissions cannot be solved with a technical proposal only. Investments in this area don't save anything or don't lead to any extra revenue. Part from a plan following points have to be seriously taken into consideration :

  • the service and maintenance costs
  • the cost of additives
  • the recycling or collection cost of all remainders
  • the energy cost
  • the investment cost

As in many cases the adage "best is not cheapest" will go. The higher the quality and the reliability level of the installation the lower the exploitation cost will be. At the purchase of a gas treatment installation future developments at site have to be anticipated, in the area of gouvernmental regulations and in the area of production capacity, which will require the installation to take a higher charge.

Task Environmental Engineering at the Aqua Netherlands fair

Aqua Netherlands 2015 - Event Hall Gorinchem - March 17, 18 and 19, 2015

Visit us at stand 118 at the Aqua Nederland trade fair at the Evenementenhal in Gorinchem on March 17, 18 and 19, 2015. We are exhibiting the Roto-Sieve drums screens and Läckeby Products sludge/sludge and sludge/water heat exchangers.

Where ? Evenementenhal Franklinweg 2, 4207 HZ Gorinchem, the Netherlands

Opening hours: Tuesday March 17th: from 10 to 18h, Wednesday March 18th: from 13 to 21h, Thursday March 19th: from 10 to 18h

Download your free e-ticket through this link

Task Environmental Engineering at the Eurofinish fair

Eurofinish 2013 - Flanders Expo - October 23 and 24, 2013

Visit us at the Suparator stand F022 at the Eurofinish 2013 trade fair on October 23 and 24, 2013 at the Flanders Expo site in Ghent. The entire stand will be build around the Suparator oil separators.

Where? Flanders Expo, Hall 1, Maaltekouter 1, 9051 Ghent

Opening hours : from 10 am to 8pm on October 23, 2013 and from 10am to 6pm on October 24, 2013

Task Environmental Engineering at the Econext fair

Econext - Antwerp Expo - April 17 and 18, 2013

Visit us at the Econext trade show in the Antwerp Expo Halls on April 17 and 18, 2013 (Hall 3 - stand A3002). The Econext trade fair is the new meeting place for ecology and technology.

Online pre-registration : www.econext.be - free access. Opening hours : from 10 am to 6 pm on Wednesday April 17, and from 10 am to 7 pm on Thursday April 18.

Location ? Antwerp Expo, Hall 1,2 & 3, Jan Van Rijswijcklaan 191, 2020 Antwerp

Task Environmental Engineering at the Eurofinish Fair

Eurofinish 2011 - Flanders Expo Ghent - September 27, 28 and 29, 2011

Visit us at the Suparator stand 8133 at the Eurofinish 2011 trade fair on September 27,28 and 29, 2011 at the Flanders Expo site in Ghent. The entire stand will be build around the Suparator oil separators.

Where? Flanders Expo, Hall 1, Maaltekouter 1, 9051 Ghent

Opening hours : from 10 am to 6pm, Wednesday to 8pm

Preregistration : www.eurofinish.be - free entrance.

Task Environmental Engineering at the Industry and Environment fair

Industry and Environment Exhibition Antwerp expo - March 30 and 31, 2011

We hope to welcome you at stand H010 (daily from 10 to 17 h).
Free entrance - preregistration by clicking on the banner, or send a short mail to info@task.be and we arrange for free entrance cards with pleasure..

test scrubber pilot gas scrubber for emission treatment and odor control

Pilot gas scrubber odor control and air pollution control

Last year Task Environmental Engineering has been investing in a brandnew pilot gas scrubber for the treatment of industrial emissions.

The pilot gas scrubber consists of a twostage stacked column in polypropylene, provided with the necessary dosing pumps, pH and redox measurement and control circuits. The installation can be operated as a one or two stage gas scrubbing unit, with several possible combinations of acid, alkaline or oxidative stages.

The gas scrubbing installation is also provided with an emission ventilator placed downstream, after the column, allowing a simple and easy evaluation of the treated gas emission. The most important operating parameters, such as pH are constantly registered, for wireless transfer by datalogger to be consulted anywhere in the world.

As a general rule, the pilot gas scrubbing installation is put at disposal of the customer on a rental base for a period of 4 weeks.

During this test period Task is of course following up the installation, at site and at a distance through wireless communication by datalogger. Task can also put basic measurement equipment at disposal of the customer, for basic gas emission sampling. For very specific sampling and analysis Task is calling in the assistance of specialized companies in this area.

After completion of the tests an evaluation will follow ; the discussion of the results with the customer will lead, if relevant, to a full scale project proposal. The pilot testing stage has several important advantages, for the customer as well as for ourselves, as well as for a potential contractor. Many preliminary questions will be answered, the tests are providing the customer and ourselves a guarantee regarding the feasability of the desired results. For more info call +32 (15) 24 21 15 or find out more on the pilot scrubber page.

Task Environmental Engineering Heist-op-den-Berg Belgium

Task is moving

Task Environmental Engineering moved to its new offices on February 10, 2009. New address : Kerkhofstraat 33, 2220 Heist-op-den-Berg, Belgium. Phone, fax and e-mail unchanged.

ultrafiltration and oil separation for reuse of process water

Process water treatment - membane filtration Caradon Radiators

Task is helping Henrad (Caradon Radiators) with an environmental friendly installation - membrane technolology/membrane filtration

(Aquarama June 2008)

Radiator manufacturer Henrad, part of the Caradon group, is attaching great importance to environmental friendly production methods. In its production plant in Herentals the company aims to respect the environment in all possible areas and to make the work floor as healthy and as pleasantly as possible for its collaborators. In order to render the teststage of the radiators as economical and as ecological as possible, Henrad contacted Task three years ago. Task, specialized in environmental engineering and directed by Stefaan Kovács, has worked out a satisfying solution in close collaboration with Henrad's project leader.

Henrad's project leader is not only responsible for the company buildings and the larger infrastructue, but is also continuously engaged in all kinds of environment related subjects. It's in this capacity that he could state that waste water flows the company produced could be optimized.

“It was especially during the testing of the radiators that the situation was subject to improvement”, he is explaining. “Our products are submerged in a testing tank, where they are put under pressure with compressed air, to allow us to detect possible leaks. However, we noticed that these testing tanks got quickly polluted. This is quite logic, because the radiators, made of large steel plates, continue to carry traces of oil from the welding robots. These oil traces were causing microbiological pollution of the testing tanks. That way, the water got trouble. Which is a problem, because we need clear water for optimal testing conditions, where our people can visually detect the leaks. Clear water is also necessary to prevent corrosion of the radiators and is better for our collaborator's health.”

Thorough audit

Henrad was solving the problem by changing the water in the testing tanks almost daily. Only, this procedure was consuming 40 to 50 m³ of water on a daily basis. Which led to an enormous wastewater stream. “Ending all up in our traditional waste water treatment installation, having to treat several other waste water streams as well.”

In order to continue to meet the severe environmental standards, Henrad decided not to discharge the water any longer, but to recycle it. After having consulted several partners, the company found their way to Task. “We had been collaborating with this company earlier”, continues the projectleader. “Earlier they provided us with an installation for the production of our process water. Being satisfied about their intervention, we were confident to collaborate again.”

The first contact with Task goes back to the beginning  2005. After a thorough audit and extended lab tests, both parties took their time for a thorough evaluation of the problem and its possible solutions.“ After a thorough evaluation of all the offers received, a decision was taken at the end of 2006. Henrad finally choose an installation based on ultrafiltration technology", Stefaan Kovács ads. “The choice of the membranes, but also preparation of the water was of crucial importance to get a perfectly functioning water treatment installation. Based on the test results Task proposed a crossflow ultrafiltration installation, based on a batch driven filtration process, allowing to further concentrate the waste water a number of times." The installation has been designed for a capacity of 1000 li of permeate per hour, but the actual performance score of the installation reaches the double of these values.

Fluid integration

The polluted water enters the working tank with a COD value of 500 ppm and is then further concentrated with a factor 30 to 50. The COD value of the permeate is below 50, the microbiological desinfection of the water is completed at the same time as well. The bright green colour of the permeate is due to the corrosion inhibitor added, which is necessary to protect the tested radiators.

“The concentrate is collected in a tank which is periodically emptied and collected. Henrad isn't obliged any longer to discharge it's wastewater stream. The permeate is collected in the permeate tank, waiting for re-use  in the testing tanks. The energetic consumption of the entire installation is approx. 7,5 kW. The installation works fully automated, PLC-controlled according to Henrad's standards. The system is entirely custom-made  and perfectly integrated in the production process. It has been installed in the production hall.”

Experience

The installation was started up at the beginning of 2007 and thus has been functioning without interruption for more than a year now. “The system is running fully automatically and without any problem”, Henrad's project leader clarifies. “Which is not that obvious, because it often are the small details deciding on how succesfully an installation will function. I'm following the machine on a daily basis. Thanks to the very open communication with Task right from the start, I already was familiar with the system even before it was installed. We then started from zero and now can dispose of an installation entirely adapted to our production process. This environmental progress was crucial to us, but on top of that, the system is saving us money in two other areas. We don't have to pump up water any longer and we don't have to discharge the water from the testing tanks. This way, the discharge taxes the company has to pay are a lot lower than before.”

“The smooth functioning of this kind of installations depends for a great deal on the internal follow-up by the customer”, Stefaan Kovács says. “The responsible staff at Henrad's is very professional and keeps the membranes in an optimal condition, which is very important because those are the heart of the entire installation.

Custom-made solutions

Task Environmental Engineering, located in Heist-op-den-Berg, has been managed since 11 years by Stefaan Kovács, who can show 22 years of experience in the environmental business. The company is specialized in emission treatment, wastewater treatment and odour control for small and mid-size companies. “We take care of the entire problem : from design up to realization, through a conceptual and precise made-to-measure job. We can distinguish ourselves in the realization of special environmental projects ; we attach a lot of importance to the choice of the materials and to the after sales services that this kind of "special" installations are requiring."

Task has no obligations to it's equipment suppliers nor is it part of a bigger holding, which might impose certain purchase obligations. “This independance is giving us the opportunity to find the most suitable solutions for each customer and to choose the best price worthy materials. We attach a lot of importance to the training of the customer's operating staff, to assure a good functioning installation in the long run and in the best possible circumstances.”

Task also has strong references in the area of complete renovation and/or optimization of existing wastewater and emission treatment plants. “More and more, we get customers who have realized after a number of years that the installation chosen previously does not meet the actual standards any longer. It often happens that the old installation cannot cope with the recent production increase. An optimization and/or renovation becomes unavoidable. As far as possible we try to keep a maximum of existing elements, in order to keep the cost as low as possible aiming to obtain the proposed and required result.”

Biorotor : underestimated wastewater treatment equipment

THE UNDERESTIMATED BIOROTOR - A classic staple with a new twist

(Ecomagazine June 2008)

For more than 10 years now, animal park Planckendael has been proving that is was an ideal solution to opt for a biorotor for the waste water treatment of its animal hospital. Unfortunately, there are only few Belgian companies to follow its example. And that's a pity, because in the long run, the advantages cannot be neglected.

Planckendael is a young , spacious and open walking park with large animal accomodations, well integrated in the landscape. Some parts of the park remain untouched, allowing the visitor to find wild plants and flowers throughout the year. Durable management is an important issue for the domain's board (rewarded in 2004 by the VBO - Association of Belgian companies - with the Reward for best Environmental Management).

And since more than 15 years Prof. Rik Van de Werf, University Teacher Environmental Care at the Erasmus College of Higher  Education and University Teacher Environmental Techniques at the VUB University of Brussels, is playing an important role in this field. Because it was he who conceived in 1994 an installation for the purification of the waste water originating from an important part of the animal accomodations, from the sanitary facilities in the park, the animal kitchen and the restaurant.

From wastewater up to drinking water

Three years later the domain's board came knocking at the professor's door once more. Because Planckendael was forced to find a solution for the waste water coming from the breeding birdhouse. This was discharged into a side channel of the Barebrook, but new regulations now called for water treatment. After thorough analysis of the situation Prof. Rik Van de Werf came to the conclusion that the combination of a biorotor with a constructed wetland was the best solution. He is explaining why : “This system is offering a high resistance to fluctuations in the degree of pollution : necessary for this kind of application as in summer there are more jung birds in the cage, and thus also more polluting manure than in winter. Besides, this solution is taking hardly any space. And that was a welcome bonus, as we only had 100 m2 at our disposal.”

But what is it all about?

The biorotor consists of a cylinder with a rotating spindle holding circular discs. “65 in total”, Prof. Van de Werf clarifies. “At one end, the wastewater flows in, at the other end the purified water flows out. Between all those circular discs, there is a porous, synthetic filling. Each pore has a well-defined surface. Small of course, but when you add the surface of all pores, you'll get a very large total surface. About a third of each disc is hanging into the polluted water. When the spindle is turning, the wet part of the disc reaches a bit above the water surface. This way, it reaches not only the wastewater, but gets also a little bit of oxygen into the pores and to the micro-organisms growing within. These microbes nourrish themselves with the pollutants from the wastewater, thus purifying it. After a while they will produces sludge plates between the discs, who will eventually detach and fall into the water in big lumps, catched by a downstream sandfilter to separate them from the water.”

As the wastewater is not sufficiently filtered after the biorotor treatment, the water is then conducted through the sandfilter into a helophyte field (only 1,5 meter away). Prof. Van de Werf explains: “Helophytes are plants, growing partly under water, just like reed. The water is slowly rippling through the root area of the field. On the roots of the plants micro-organisms are growing, feeding themselves with the dirt in the water. Those who don't do this are disadvantaged and will compete with those who do and thus absorb more nutrients.  The pollutants processed in their metabolism will produce several substances serving at their turn as food for the helophytes. The plants itself produce oxygen, which will be led through the hollow stalks to the bacteria, allowing them to breathe. This way, plants and micro-organisms are helping each other and together they are extracting the pollutants from the water.”

Ecologically sound and economically operated system

This is an ecologically sound and very economically operated system : the purification of the water is obtained in a completely natural way, the required energy (rotation of the spindle) is reduced to an absolute minimum. The question is, of course, why this system isn't adopted on a much larger scale. Because a biorotor such as in Planckendael isn't used that much, certainly not in an industrial environment.

Stefaan Kovacs, Manager of Task Environmental Engineering, who installed the wastewater treatment plant as conceived by Prof. Van de Werf, is commenting. “In an industrial environment mainly systems with activated sludge are used. Water is then mixed with micro-organisms in large aeration tanks, resulting in sludge flakes who will be separated from the water in decantation tanks. A biorotor is also functioning according to this principle of sludge on a support. Activated sludge systems are generally cheaper in purchase (especially for residential and small-scale applications) than a biorotor and do not require a second, separate step to purify the water entirely from all its nutrients. The activated sludge system as well as the biorotor system in their base configuration are often not sufficient to purify the water entirely. On the other hand, the advantage of the activated sludge concept is that the necessary extra purification can, in most cases, be integrated in an existing installation, what is cheaper than adding another module, which would be the case with a biorotor. An example of extra purification, easy to integrate in an activated sludge system is in case of phosphor and nitrogen removal from industrial wastewater.  The phosphor can for instance be removed by adding certain chemicals such as iron or aluminium chloride whilst nitrogen is removed in a microbiological way.

Nevertheless, I think that these two disadvantages are largely compensated by the advantages of the biorotor. The aeration of the biorotor is obtained in a natural way, without the use of a compressor for air injection, all that is needed is one single motor to get the spindle with the discs moving. An activated sludge system, on the contrary, is requiring several electronically steered and fully automatic air pumps for the aeration of the water, which will result in a 10 times higher energy consumption. The biorotor installation requires hardly any maintenance and the installation's principle is quite simple, so that a possible problem can be quickly solved. This lower operation cost for the aeration of the biorotors can make it a more economic system in the long run, compared to other purification systems. And then I haven't even mentioned that a biorotor hardly requires any space at all... I think industry has a far too restricted view on the biorotors' advantages, especially those in the long term. Industries with biodegradable wastewater in particular, could better seriously consider a biorotor solution. Think for instance about agricultural companies and the food processing industry, such as vegetable processing companies.”

Also for relatively small municipal wastewater treatment plants, such as residential areas out of reach, campings and so on, a biorotor can offer an interesting alternative.

www.planckendael.be

jet aeration submerged aeration system for deep bassins

Jet aeration systems by Task Environmental Engineering

(from Milieugids (Belgium) ed. 2007)

Recently Task Environmental Engineering, specialized in the realization of industrial emission treatment and wastewater treatment plants, has installed a number of jet aeration installations at the plants of Vanheede Environment Group (Sodecom Quévy), Recyc-Oil in Wielsbeke and Shanks Flanders (Ghent site).

The most specific feature of the jet aeration system is the unequaled operational reliability and the very long life time cycle; Task has been succesfully implementing this system for more than 10 years.

The submerged jet aerators are mixing air with mixed liquor, which is subsequently injected in the wastewater. The actual jet aeration systems are usually mounted at a height of 75 cm up to 120 cm above the tank bottom (against 30 cm in the past) . This is resulting in considerable savings in the field of investment and energy cost of the surpressors.

The jets don't inject horizontally, the way the traditional systems do, but at a downward angle of 15 tot 30 °, depending on the tank configuration.

Remarkable for the jet aeration system is the absence of moving or wearing parts in the aeration tank, as well as the absence of mixers during the denitrification periods.

The jets are typically realized in glass reinforced polyester, the supports and other fasteners in stainless steel 316.

More information on the jet aeration page

emission treatment and odor control unit waste processing industry multistage gas scrubbers

Odor control and emission treatment Shanks Vlaanderen Roeselare

(published in several technical/professional journals and -websites - November 2002)

Task Environmental Engineering in Heist-op-den-Berg recently realised a complete multistage industrial emission treatment plant for one of the most known and most experienced waste collectors and - processors, Shanks-Sobry in Roeselare.

Shanks placed the order with Task Environmental Engineering further to a very thorough evaluation of several Belgian and foreign suppliers.

This emission treatment unit , a multistage gas scrubbing installation has a capacity of approx. 35.000 m³/h, treating industrial emission effluents coming from several sources within the company.

The complete odour control unit has been operational since november 2002 .

Task Environmental Engineering has achieved with this realization a very important reference in the field of industrial emission treatment.

For more information concerning industrial emission treatment and odour control techniques, please consult our website www.task.be, air-odor

odor control air treatment and odor treatment air scrubber

Odor control Indaver - Vlar Grimbergen

(published in several professional/technical journals and -websites - August 2002)

Task Environmental Engineering in Heist-op-den-Berg (Belgium) realised an odour control unit to treat the emissions produced by the composting plant of Indaver – Vlar Compost in Grimbergen Belgium. The installation combines a scrubber unit, heat exchanger and cooling tower for the treatment of emissions at a flow rate of 120.000 m³/h.

The installation was taken into service on May 28, allowing for a thorough testing and evaluation during the first months. The initial evaluation is showing that the physical and chemical design criteria are met without any problem. The installation will be further evaluated during the months to come with regard to its odour elimination capacities. It is Indaver-Vlar Compost’s goal to reduce the olfactif impact of its composting activities to an acceptable level for the industry and inhabitants of the surrounding area.

For more information with regard to odour control and emission treatment, please consult the air-odor section of this website