Treatment of municipal wastewater by anaerobic digestion was investigated. A new process is described here, where anaerobic digestion of municipal wastewater is the main step for removal of organic matter, resulting in much lower sludge production. Steps for removal nutrients are also included. The suggested process contains the following steps: 1) The organic matter is primarily removed through anaerobic degradation using high-rate reactors. 2) For nitrogen removal. the Anammox process or physico-chemical methods will be applied. 3) For phosphorus removal, bilogical process will be used. 4) On-line volatile fatty acids (VFA) monitoring and control will ensure optimum utilization of VFA's for P removal and biogas production. 4) Thermal hydrolysis for treatment of residual sludge will be used for further decreasing the amount of excess sludge. Batch experiments showed that sewage could be inhibitoy for the anaerobic process if digested undiluted. The highest methane potential was found with filtrated sewage, unfiltrated sewage gave biogas potentials, which were 4-6 times lower, depending on the temperature. Size distribution of the granules showed that the biggest granules had the highest hydrolytic activity and no substrate limitation was observed for the used granules. Experiment with UASB reactors showed COD removal efficiencies between 49-82 for the toal COD and 25-99 for the soluble COD. No significant differences were observed between reactor performance at 22 and 37 degree C.
|Publication status||Published - 2002|
|Event||3rd International Symposium on Anaerobic Digestion of Solid Wastes - Munich, Germany|
Duration: 18 Sep 2002 → 20 Sep 2002
Conference number: 3
|Conference||3rd International Symposium on Anaerobic Digestion of Solid Wastes|
|Period||18/09/2002 → 20/09/2002|