Research On Integrated Technology And Equipment Of Municipal Solid Waste And Sewage Sludge Treatment

With the deepening of the extent to deal with and the increasing of treatment rate, the amount of generated sludge also increased, and the sludge issue has become one of the environment issue affecting urban development. Thus, properly handling and disposal of sludge is necessary,and after anaerobic digestion sludge dewatering landfill is the main approach. Similarly, with the constantly advancing urbanization, the output of domestic refuse is also increasing, and The organic matter content increases with the improvement of people's living standard, and waste composting (digestion) is the domestic refuse processing technology (stabilization). It can reduce trash volume, kill pathogenic microbes and improve performance, produce biogas garbage (anaerobic conditions), etc. After composted it can use again, and it is energy saving and emission reduction, and it can achieve the purpose of recycling economy, and it has been much concerned. This paper refers composting of domestic refuse and TISID technology, and designs domestic refuse and sewage sludge integrating treatment reactors. Experimental studies have been done to its operation efficiency, and according to the results the reactor is optimized.Effective volume of the reactors is 420L, and effective volume of the sludge storage is 220L. The reacter designs with the feeding rate of 30%, and using sludge gradually cultivation, the reacter starts with the feeding rate of 10%; effective volume of the rsfuse storage is 200L, and the refuse is processed with anaerobic fermentation. Test inspects operation conditions of startup stage in the integrated reactor. Results show that pH of the rsfuse storage is 3-5. Acid fermented is more active, but the alkaline fermentation is restrained. Garbage fermentation time to mature need 100 days, and compost product cannot use, but fermentation can produce more gas(gas production increase gradually, the most 25L/d), it can give gas complement mixing for sludge; anaerobic digestion of the sludge storage also influences by temperature, and appeares more serious acidification phenomenon, and the basicity is insufficient in storage, and methanogens activity is restrained, and VS/TS drops from 0.4~0.8 to 0.3~0.45, and VSS removal rate is between 0.18~0.25. It shows that sludge digestion performance is volatile, and continuous operation condition is not ideal, and sludge anaerobic digestion is not good. Experimental study of integration in the start-up phase reactor operating conditions, the results show that the waste storage pH maintained at between 3 to 5, more active acid fermentation, but the basic fermentation was inhibited, garbage fermentation time needed to mature more than 100 days required , and the compost product can not be used, but the fermentation can produce more gas (gas production increases, the maximum a 25L/d), added to stir the sludge storage gas; sludge anaerobic digestion of the same positions affected by temperature than large, there has been more severe acidification, alkalinity storage warehouse insufficient activity of methanogenic bacteria was inhibited, VS/TS only from 0.4 to 0.8 down to 0.3~0.45, VSS removal rate of 0.18~0.25 shows the performance of sludge digestion and volatile storage, continuous operating conditions are not ideal, did not meet a better effect anaerobic digestion. In summary, the refuse of the integrated reactor is treated by anaerobic fermentation, and the treatment effect is not incompatible with the reactor designed.Through the analysis to operation results of the integrated reactor and regarding to reactor flaws, the reactor was optimized, and operation performance to the optimized reactor is studied. Effective volume of Optimized reactor is 710L, and effective volume of the sludge storage is 220L. And using sludge gradually cultivation, the reacter starts with the feeding rate of 10%; effective volume of the rsfuse storage is 600L, and the refuse is processed with anaerobic fermentation. Through test results, when the rsfuse storage is ventiled to 0.20 m3/min.m3, ferment producing hot can make rsfuse storage quickly reach above 30℃, and the time of refuse fermentation to mature needs only 20~30 days. PH of the rsfuse storage is at 6-7, and although somewhat fluctuations, it still can ensure the fermentation of reaction smooth. Temperature of the sludge in 5 days reaches above 30℃, and it is with conditions of Temperature anaerobic digestion, and with startup of the reactor pH maintain between 6.5~7.5, basicity is between 800~2500mg/L, and it shows that reactor methanogens is more active and anaerobic digestion is in good condition. When mixing number 2 times/d (30min/times) and Volume load for 0.65～1.31 KgCOD/m3.d, moisture content drops to 93%, and it shows concentration effect is good. Through VS/TS drops from 0.45~0.69 to 0.38~0.43 and organics removal rate is above 40%, it shows that organics removal rate is high and row mud effect is good. In summary, the reactor operation condition is very good, and it meet the need of anaerobic digestion.