Wash Water

Backwash water generated in drinking and process water treatment is effectively treated in a compact wash water treatment scheme, producing a water quality which may be reused in the main production process and a residual concentrated sludge flow.

Wash Water

Water
Reuse

Most water treatment processes are producing waste water, which typically requires further treatment prior to discharge. Therefore options to treat this waste water with the aim to reuse often makes sense.

Cost
Effective

By reducing the wash water volumes and reducing the waste stream the overall water treatment process becomes more cost effective. Various techniques are available to implement a wash water treatment process effectively.

Sustainable solutions

By reducing the waste water flows in water treatment processes a more sustainable set-up is reached. The additional investment is small in comparison with the gains, often making a wash water scheme a no-brainer.

Approach

All water treatment plants produce wastewater. Sand filter backwash water is the largest wastewater component generated. Typically wash water contributes to one to ten percent of total drinking water production. Hence it is obvious to focus upon wash water reuse schemes. Implementing reuse schemes will simultaneously reduce net water intake.

Both discontinuous and continuous wash water reuse schemes are used in practice. The most optimal configuration depends on the actual release of wash water and the wash water storage facilities. Lamella clarifiers, using integrated coagulation and flocculation, showed to be reliable for backwash water treatment. Supplied as standard units, they are equipped with integrated hydraulic mixing and flocculation equipment, including sludge hoppers for simultaneous sludge thickening.

Features

Reliable and compact secondary treatment

A compact wash water treatment process typically consists of coagulation/flocculation, lamella settling and media filtration. Most often a disinfection stage is implemented to avoid cross contamination of the primary treatment process.

Cost effective

Wash water reuse is cost effective as the water to be treated already passed the primary water treatment process. Implementing a secondary wash water treatment process prevents this water to be discharged. It adds up to the net drinking/process water production.

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