Ehrmann AG, Moscow, Russia
The production of joghurt at this plant also generates 600 m³ of waste waterper day. In order to minimize running costs a significant reduction of the sludge volume and the generation of biogas were envisaged.
After the solid matter has been separated the effluent flows into a stirred buffer tank where variations of flow, pH and fat content are balanced out. The tank is sufficiently sized for emergencies. The organic substances hydro-lize after pH’s adjustment. This is followed by flotation, which separates the lipophile substances from the effluent. A feed/treated effluent heat exchanger improves the energy balance of the treatment system. The main element of the treatment process is the Biomar® AKB reactor which creates a controlled anaerobic environment, in which the effluent is biologically cleaned. The biogas is used for the production of steam which can be used in the dairy process. The anaerobic treatment is followed by activated sludge treatment, which further reduces COD, BOD, nitrogen and phosphorus.
The effluent from this aerobic process meets high quality standards set by the municipal authorities.
The effluent then gravitates to the final clarification tank.  The process only produces small amounts of surplus sludge. Exhaust air is collected and mineralized in the activated sludge tank. A programmable logic controller (PLC) and a process visualization system support complete automatic operation. The plant fulfills all environmental requirements with regard to water, air and noise pollution.
 

space requirement	50 m x 30 m
control system	programmable control,
	process visualisation
methane reactor
volume	450 m3
material	stainless steel, isolated
biogas removal	> 1,200 m³/d
temperature outside	-35°C up to +40°C
process temperature	approx. +35°C

Mr Thomas H. Weißer
thomas.weißer(at)envirochemie.com
phone: +49 (0) 61 54 / 69 98 - 28