An experimental study on treatment of mixed sewage from villages and towns by combined process of electrocatalytic oxidation and MBBR
Electroctatlytic oxidation and MBBR combined process was adopted to treat mixed sewage from villages and towns waste transfer station and rural domestic sewage.Wastewater from waste transfer station was pretreated by electrocatalytic oxidation process;besides,the biochemical treatment of mixed sewage from villages and towns was carried out using MBBR process.The results showed that,under the condition that the electrolytic voltage was 20 V,the sodium chloride dosage was 10 mg/L,using electrolytic oxidation process to treat wastewa-ter with COD concentration of 1 089 mg/L and chroma of 500 times,the removal rates of chroma and COD reached 90.5%and 53.5%respectively within 120 min.Among all the quality indicators of the effluent water from MBBR process,except for total phosphorus and suspended solids,the mass concentrations of COD,ammonia nitrogen and total nitrogen all met the requirement of level A grade 1 in GB 18918-2002 Discharge standard of pollutants for municipal wastewater treatment plant.The removal rate of total phosphorus could be further im-proved through biochemical sludge discharge and chemical phosphorus removal;the removal rate of suspended solid could be further improved by setting a filter device.
electrocatalytic oxidationmoving bed biofilm reactorwastewater from wastes transfer stationrural domestic sewage