Treatment of Excess Sludge by Microwave Assisted Activated Carbon Fiber
Excess sludge was treated by microwave assisted catalytic oxidation using activated carbon fiber as catalysts which has strong microwave-absorbing and recycle ability.Results indicated that microwave irradiation combined with activated carbon fiber increased the lysis of excess sludge.In the optimal operation of 700 W microwave irradiation power,microwave irradiation time of 60 s and activated carbon fiber dosage of 0.32 g/g SS,the sludge dissolving rate increased to 30.9%,which was doubled compared with the simple microwave treatment.In the operation,more microbial extracellular polymeric substances(EPS) were decomposed,and more intracellular matters were released to liquid phase.Concentration of SCOD increased from 380 mg/L to 2 400 mg/L,concentration of TN,TP increased by 3.1 and 2.1 times respectively than single microwave processing,the protein contents and total sugar contents also increased significantly.Part of organic nitrogen was mineralized by oxidants to NH4+-N from 10mg/L to 82 mg/L.