Piggery Wastewater By Anaerobic Digestion And Post-processing Techniques

We always face the problem to solve the problem that is waste water from piggery is difficult to treat due to it has higher organic waste contained in it, in this paper will adapt anaerobic digestion and aerobic digestion process, observed the renting time influence the degree of the anaerobic digestion , different treatment process for influent of anaerobic digester treatment influence aerobic digestion effect, base on this , make sure to use the anaerobic digestion + adding influent waste water+ SBR integrated technology process, and also put this process into the poggery waste water treatment, after experiment, get the result as following:The longer rentation time of anaerobic digestion of piggery waste water, the rate of COD removed is higher , but the worse effect of NH4-N removed , meanwhile the influent of waste water ,and degrade the waste , organic fermentation, when PH value lower than 6.0, it maybe impact treatment effect after the anaerobic digestion .Adapting SBR process to treat effluent from piggery waste anaerobic digestion directly,the effect become worse, can not reach the discharge standard ,through adding ration effluent, can improve greatly rear treatment, NH4 and COD removed rate can reach 93.7% and 89.0% prospectively. and economy is feasible . if adding FeSO4 NaoH AND Na2S into rear treatment process, even it can improve effect of NH4-N removed , but whole treatment effect is not ideal, the rate of COD removed will decreaseAdding 30%-50% influent piggery waste into anaerobic digester will be suitable , and the value of BOD /TN in mixture liquid will be -3.80, and ration of BOD/COD will increase from 0.19 to 0.39-0.50, under this condition, the rate of COD and NH4-N removed both can reach 92.2%and 98.2%, it increase the water quality of effluent.This paper put forward innovatively to adding piggery waste water into anaerobic digestion to improve ratio of BOD/COD , further to improve aerobic digestion effect, and set up preliminary process for piggery waste treatment, such as anaerobic +aerobic process, the research method and conclusion have reference value for further research and practice.