Water treatment and water recovery with membranes

Membrane filtration is commonly used as a post-treatment technique on effluent, usually in the context of water recovery or reuse. However, in many cases this technique is used to treat specific wastewater and process water streams, such as oil emulsions.

Most filtration techniques can only filter undissolved particles from the water. Microfiltration and ultrafiltration can only remove suspended solids from the pretreated wastewater. Consequently, dissolved salts, dyes, metal ions (which affect the conductivity of the water) and sugars remain in the wastewater. As a result, this water cannot be reused in the production process. Only reverse osmosis (RO) allows salts, metal ions, etc. to be removed.

Reverse osmosis allows the highest degree of purification, physically, chemically, organically and bacteriologically. In wastewater treatment, reverse osmosis technology is used for the production of ultra-pure water for industrial process water, nitrate removal, desalination of brackish and seawater, … .

 

TASK proves time and again that we take all constructions and placements very seriously by meeting the required standards and obtaining the necessary certificates. We are therefore the right partner for carrying out your installation.

Advantages

  • reliable technology
  • less chemicals required
  • relatively easy follow-up
  • efficient use of energy

Cons

  • concentrate should be treated or collected

Membrane filtration: different types of membranes

There are several types of memebranes: tubular membranes, hollow-fiber membranes and spiral-wound membranes. Each type has its preferred field of application. The membranes must be and remain resistant to solvents, high temperatures and very different pH values. As a result, the new generation of membranes has also become increasingly efficient. Compared to the old generation of membranes, the replacement of membranes can be postponed longer and longer. Consequently, the high cost price of membranes can be compensated more and more.

Application areas of membrane techniques

  • oil emulsion separation
  • recycling of carwash water
  • treatment of wastewater from the cosmetics, food and beverage industry
  • reuse of process water
  • rainwater recovery
  • reuse of various effluents
  • liquid degassing

Water treatment for reuse of process and waste waters

Companies are paying more and more for the discharge of wastewaters. The need to maximize the reuse of these wastewaters is increasing, especially for companies where water plays a major role in the production process (slaughterhouses, laundries, cosmetics production, food and beverage industry, textiles, etc.).

Deploying an RO plant allows a substantial portion of wastewater to be reused in the production process. As a result, your company can save substantially on water and discharge costs. Consequently, the investment amount can be recovered relatively quickly. Moreover, the operating cost is often significantly lower than the purchase price of city water. For example, depending on the customer’s specific requirements, this is only one-third of the purchase price of city water.

For each specific project, the feasibility is checked in advance through efficiency and dimensioning tests on site. If necessary, a test installation is deployed. The final system is completely custom designed for the customer. This always depends on the type of wastewater, the intended quality for reuse and the economic aspects.

The RO unit is mounted on a skid to form a compact unit, easily integrated into an existing wastewater treatment plant. The RO plant is a fully automated unit, fully remote-controlled and controllable.

Liquid degassing

Membranes can also be used to degasify water and liquids. The oxygen content of various process waters can thus be reduced to ppb levels. In a degassing unit, the gases dissolved in the liquid are removed from the liquid by means of so-called membrane contactors. The gases that can be removed are not only oxygen but alsoCO2 and NH3. The degassing is done under vacuum, with or without a stripping gas. Liquid degassing with membranes allows a very compact installation to fit into an industrial environment, without large modification costs and/or space requirements for the customer. Significant savings can be made in operational costs. For example, an industrial nitrogen grade can be used instead of a pure (and more expensive) variant. On an annual basis, this can save you a lot of money! In an industrial environment, degassing membranes are mainly used in the following applications:

  • O2 removal in process water down to ppb level
  • CO2 removal from various process waters
  • Ammonia removal from various process waters
  • removal of gases from beverages/liquids in the food industry
  • corrosion control in industrial environment
  • controlled carbon dioxide and nitrogen addition to beverages

Our solutions

Whether it is a completely new installation, or the renovation or optimization of an existing installation, we offer you a correct solution, with an optimal price-quality ratio. Our installations are always seamlessly integrated into the existing situation of each production site. We aim for durable, low-maintenance and correctly dimensioned installations.

In addition, we provide thorough on-site training for maintenance personnel to ensure that the water treatment plant continues to run smoothly over the long term. Should problems nevertheless arise, we are always on standby for prompt intervention.

Our expertise in water treatment

Various companies from very different sectors ranging from waste processing and acquisition to food, from automotive industry to textiles, from animal feed producer to pharmaceutical industry, from metal processing industry to chemical industry, etc. have already called upon our expertise for the construction of water treatment installations and/or air purification and odor control installations. We can present one or more references for all the above-mentioned specialisations.

How do we work?

When you contact us for a problem with contaminated air, we will work with you to determine the nature of the contamination.

We take the necessary measurements and tests.

We propose a customized solution.

We install and commission the system.

We provide the necessary maintenance afterwards or train maintenance personnel on site.

If the source of pollution changes (e.g., due to changes in your production processes), we will optimize the air purification system as needed.

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