Study The Impact Of Residence Time And PH On Two-phase Anaerobic Digestion Of Sludge

As the rapid increase of the amount of sewage treatment, there are more and more municipal wastewater treatment plants, most of which basically don't have the appropriate sludge treatment as well as disposal facilities. In order to realize the goal that make the sludge harmless reduced, and recyclable, It's the very time to find a viable processing to complete the goal.Compare of the effective volume of 5L acidogenic reactors'efficiency when hydraulic residence time (HRT) were 2d, 4d, 6d. Hydrolysis and acidification results from good to bad were HRT = 4d> HRT = 6d> HRT = 2d. When HRTwas 4 days, the acidogenic reactor can achieve the highest SCOD proliferation times,which was 180 times to the original sludge. There were the highest content of acetic acid in these three acidogenic reactors, then followed by monoprop, butyric acid was at the least., Compare the treatment efficiency of two-phase anaerobic reactor, that HRT was 4 days of the acidogenic reactor in series with methanogenic reactor,to HRT = 25d of a single-phase reactor . The removal rate of organic material and gas production of the two-phase reactorwere higher than single-phase reactor, the average removal rates of VS could reach average removal was 35.78%,29.27%, gas production were156.36mL/gVS and 125.84mL/gVS.To further reduce the residence time and improve efficiency of two-phase anaerobic treatment process, then compare the efficiency of methanogenic phase reactor when HRT were16dand12d with single-phase reactor which HRT was 20 days. The removal rate of organic was 51.29%, 45.84% and 46.04%. Analyze the content of gas components,CH4were 69.47%, 69.29%, 66.63%, CO2were30.53%, 30.71%, 33.37%, The average gas production per unit mass, respectively were 253.13mL/gVS, 266.47mL/gVS and 106.31mL / gVS. The ability of create clean energy of the two-phase reactor was significantly higher than single-phase reactor, and the processing power and anti-impact load capabilities were stronger. Considering the capacity and economic costs, methanogenic phase's hydraulic retention time of 12 days of two-phase reactor is the optimal choice.In order to develop intensive treatment process for sludge,it's necessary to improve the effiency of the high solid content of hydrolysis acidification. Higher solid content of sludge dewatering Optimization of Hydrolysis results: When at 35℃, TS = 8%, F / M = 3, without adjustment the effect of hydrolysis acidification was the best. pH> 6.0, the dewatered sludge mainly was butyrate-type fermentation, acetic acid and butyric acid as the main fermentation product.