sludge2energy A way to energy self-sufficient sewage treatment plants


Co-incineration costs less, but on the other hand monoincineration provides the option of phosphorus recovery. Another factor in favour of incineration is the fact that it allows to recover the amount of energy consumed for sludge transport, dewatering and drying. It is an innovative concept of decentralised sludge utilisation by generation and use of thermal and electrical energy.The plant on WWTP Straubing is designed for 200,000 PE and presently treats about 35,000 m3 wastewater per day. After anaerobic sludge treatment and dewatering by means of centrifuges this is an annual volume of almost 9,000 t sludge dewatered to on average 28-29 % DR. The thermal energy content of dried sludge is a substantial value for the creation of an energy balance. The thermal value of dried sludge with 65% dry residue is comparable with brown coal and provides 1,020 kWh of energy. With according boiler efficiency, about 800 kWh of thermal energy can be generated. After deduction of further thermal losses in the micro gas turbine about 700 kWh of thermal energy effectively remain for the drying process. With a thermal energy consumption of about 565 kWh for the drying process there is even a surplus of energy available.

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