Continuous reactor with anaerobic micro-organism to disintegrate excess sludge

摘要

Secondary pollution caused by excess sludge generated by sewage treatment continues to elicit an increasing amount of concern. To reduce the discharge of excess sludge in the process of sewage treatment, a continuous reactor with anaerobic micro-organism was designed and utilized to disintegrate excess sludge. After disintegrating for 360 h in this reactor, the volume of which was 4 L, the disintegration efficiency of excess sludge reached 50%. When the hydraulic retention time was 3 d, the concentrations of COD, NH4+-N, TP, protein, and polysaccharide increased from 72 mg L-1, 0.04 mg L-1, 0.005 mg L-1, 42.94 mg L-1 and 22.69 mu g L-1 (0 h) to 3103 mg L-1, 3.11 mg L-1, 3.88 mg L-1, 37.32 mg L-1, and 83.78 mu g L-1 (360 h), respectively. When the hydraulic retention time was 4 d, the concentrations of COD, NH4+-N, TP, protein, and polysaccharide were all higher than that when the hydraulic retention time was 3 d. All these indexes rose with the anaerobic time, and rose with the increase in hydraulic retention time. Results showed that the continuous reactor with anaerobic micro-organism has a good effect on excess sludge disintegration.