Virtual tour of Salher’s sewage treatment plant for a dairy industry

Salher is a benchmark in the industrial water treatment sector. Its latest plant of this type is designed to treat wastewater generated in the manufacture of dairy products and, thanks to a membrane technology system, to reuse the treated water for cleaning the plant.

This new WWTPI aims to reduce pollutant loads to the values required for discharge into a municipal sewer. This line of water treatment is based on the following phases:

• After pumping and pre-treatment by rotary sieve, the incoming raw water will be conditioned.
• The second phase corresponds to the physico-chemical treatment and consists of a dissolved air flotation (DAF), which consists of a flocculation tube, a scraper, a polyelectrolyte preparation plant, a reagent dosing system and a feed pump.
• The water reaches its third phase by pumping to the biological treatment, where organic matter (BOD5 and COD) and nitrogenous matter (Nt) will be removed in two stages. The first stage is used to condition the water and develop the biological process and is carried out in an anoxic tank and in an aerobic tank with reactors in civil works. This stage also has a cooling system consisting of a heat exchanger and a cooling tower, the purpose of which is to maintain, if necessary, suitable temperature conditions for the good development of the bacterial population. The second corresponds to surface ultrafiltration with external cross-flow MBR membrane technology.
• Finally, the treated water is accumulated in a tank, ready to be reused in the cleaning processes of the treatment plant.