【作者】 洪荷芳；

【导师】 李正山；

【作者基本信息】 四川大学 ， 环境工程， 2004， 硕士

【摘要】 目前城市污水处理厂大多采用活性污泥法降解COD、BOD，技术成熟，但是由于该方法的工艺过程中因微生物增殖而排出大量剩余污泥。这种污泥浓缩性差，需经分离、稳定、消化、脱水等处理过程，最终用于填埋、焚烧或农业利用。污泥中的有毒有害物质直接影响人体健康和安全，对环境造成二次污染，污泥处理费用高，因此完全有必要进行污泥减量方面的研究。 本论文采用臭氧-高效复合菌系统对污泥减量新技术进行研究。重点研究污泥浓度和臭氧量对污泥减量效果的影响；污泥回流比和高效复合菌对污泥减量效果和水质的影响；以及臭氧氧化污泥减量的机理。 研究结果表明，采用臭氧-高效复合菌系统实现污泥减量在理论上是正确的，在实际上是可行的。污泥经过臭氧氧化，菌胶团变得疏松，丝状菌网状结构被挤压破坏，密度降低，细胞量明显减少，细胞质溶出，细胞内部结构遭到破坏；污泥浓度和臭氧量均会影响污泥减量效果，并且存在最佳污泥浓度和臭氧量。当SV％=40，O₂=20L／h时，污泥去除率最高，达到67.95％，此时臭氧量为0.15gO₃／gMLSS，污泥浓度随时间的变化关系为： S=3209.60e-0.1428t其中：S——MLSS浓度，mg／L；e——指数常数；t——时间，h。臭氧-高效复合菌污泥减量系统能够连续循环。当污泥回流比r=0.1时，能有效地达到污泥去除效果。未投加高效复合菌时出水COD_Cr略超出污水处理厂二级出水水质标准，此时O₃量为0.24gO₃／gMLSS；而投加高效复合菌时出水COD_Cr能够达到国家二级出水水质标准，此时O₃量为0.23gO₃／gMLSS。NH₃-N浓度和浊度达到国家一级排放标准。四川大学硕f学位论文 臭氧一高效复合菌污泥减量新技术对于解决污泥问题具有理论和实际指导意义，对指导工程设计具有重要的参考价值。 关键词:臭氧高效复合菌污泥减量活性污泥法更多还原

【Abstract】 Abstract-At present municipal sewage treatment plants reduce COD and BOD using activated sludge process mostly.But much excess sludge is produced in the process because of microbe breading.This kind of sludge can condensed poorly and is used for covering,burning and agriculture after parting,stabilization,digestion and dehydration. The toxicant,injurant will do harm to health and safety,can pollute the environment once more,and it is expensive to treat.lt is necessary to study a new process of sludge reduction.Thesis studied the new technology of sludge reduction with ozone- effective composite bacteria, from effect of sludge concentration and ozone dosage on sludge reduction,sludge circumfluence rate and effective composite bacteria on sludge reduction and water quality and the theory of sludge reduction with ozonation.Studies shown that,it was correct theoretically and feasible practically.After ozonation,zooglea became loose ,filosea was broken,the amount of cell was decreased evidently,cytoplasm was dissoluted and the inner framework was destroyed.Sludge concentration and ozone dosage also affected the sludge reduction and there was best value. When S V%=40, O2=20L/h, rate of sludge reduction was high,reaching 67.95% and O3=0.15gO3/gMLSS.The relation of sludge concentration and time wasS=3209.60e-0.1428t, in which,S--sludge concentration,mg/L,e--index constants--time. h.The system of ozone-effective composite bacteria could circulate well. When sludge circumfluence rate was 0.1,sludge was reduced effectively.CODcr went beyond 2nd standard of sewage treatment plant a little in water quality without effective composite bacteria,while O3=0.24gO3/gMLSS.And CODCr could reach 2nd standard of sewage treatment plant in water quality with effective composite bacteria,while O3=0.23gO3/gMLSS. NH3-N and concentration of particles reached lnd standard of sewage treatment plant.There is significance to study new technology of ozone-effective composite bacteria to reduce sludge in theory and practice.lt can supply reference and guide for engineering design.更多还原