Anaerobic Co-Digestion of Domestic Solid Waste and Wastewater of Disperse Rural Households in Taihu Lake Basin

The technology of anaerobic fermentation for biogas production using domestic decayable solid waste from rural disperse households as base substance and flowing domestic wastewater from the households as nutrient distributor is developed to realize co-disposition of the two types of waste in the rural area.Tests of the technology show that the use of the wastewater increased biogas generation from the solid waste.The treatment of filling of wastewater once every 5 days is higher in cumulative biogas production than the treatment of filling of wastewater once every 3 days.With the water filling rate set at 100 mL,the methane concentration in the digester was 2.4 times(P>0.05,n=6) higher in the treatment of filling of wastewater once every 3 days than in the control(filling of distilled water) and the cumulative methane production was 4.9 times higher in the former than in the latter in 45 days.Methane accumulation in the digester was in direct proportion to wastewater filling rate.With the wastewater filling rate increasing from 50 to 150 mL,methane accumulation increased by 2.1-4.5 times.The outflow from the digester was>10 g·L^-1 in CODCr ca 600 mg·L^-1 in TN and ca 100 mg·L^-1 in TP.So it can be used as liquid fertilizer for direct application in the farm fields.