Processes in Waste Water Treatment Plants
Today, thanks to the German chemical engineer and hygiene pioneer Max von Pettenkofer, we are in the position to offer treated water in the best quality. Typically, the waste water originates from domestic, municipal or industrial use as well as from rainfall. It contains dissolved and undissolved substances, which can be of organic or inorganic origin. In some cases, waste water also contains heavy metals and salts, which are dissolved in the water. In today´s state of the art waste water treatment plants, the waste water has to pass through many different stages like mechanical, biological and sludge treatment.
Stage 2: Biological treatment
The next stage is the biological treatment, here micro-organisms – anaerobic, anoxic and aerobic bacteria – serve to decompose dissolved substances contained in the waste water. The process is divided into 2 steps:
- Denitrification and nitrification phase
- Final clarification
Stage 3: Sludge treatment
The last stage is the sludge treatment. This sludge comprises primary sludge, secondary sludge and grease. Primary sludge is mainly composed of faeces. The terms secondary or excess sludge define excess micro-organisms that are removed from the treated water after the final clarification stage. The different types of sludge can either be treated together or separately.
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