【作者】 田大江；

【导师】 吕树光； 王立芳；

【作者基本信息】 华东理工大学 ， 环境工程， 2012， 硕士

【摘要】 吉林市某污水处理厂每年污水处理过程中产生剩余污泥约5000吨左右,污泥经浓缩脱水后填埋,这种方法并没有从根本上消除污染,且填埋场填满后,又要投资再建,费用较高。因此迫切需要开展剩余污泥减量化技术的研究,一方面可以大幅度减少污泥的危害,另一方面可以减轻污泥进一步处理与处置的难度和负担。针对上述问题,总结了目前国内外有关剩余污泥减量技术的应用及发展现状,并着重研究了污泥龄和投加酶制剂对剩余污泥产量的影响,同时验证了将延长污泥龄与投加酶制剂联合应用时的污泥减量效果,取得了以下成果：延长污泥龄能够实现剩余污泥的减量。保持污泥龄60天,可使剩余污泥减量14%,对系统出水COD、NH3-N略有影响,但影响程度很小,可忽略；可使系统的SVI明显升高,但SVI仍在合理范围内。保持污泥龄90天,可使剩余污泥减量27%,但系统出水COD明显升高。由此可见,延长污泥龄可实现剩余污泥减量的目的,虽然减量效果一般,但在一定程度上是一种可行的污泥减量方法。结合污泥减量效果及对系统出水水质的影响对两种酶制剂进行了筛选,结果表明：1#酶制剂的效果优于2#酶制剂。投加1#酶制剂能够实现剩余污泥的减量。酶制剂日投加量0.2mL/30L时污泥减量比例达19%,酶制剂日投加量0.4mL/30L时污泥减量比例达28%,酶制剂日投加量0.6mL/30L时污泥减量比例达30%。投加酶制剂后系统出水水质较好,COD、NH3-N较空白值有降低趋势。投加酶制剂可使系统的SVI略有降低。最佳酶制剂日投加量为0.4mL/30L。由此可见投加酶制剂对污泥减量效果明显,对系统出水水质有所提高,如果产业化则仅需在好氧池源头投加酶制剂即可,易于在现有装置上实现,是一种较理想的污泥减量方法。延长污泥龄并同时投加酶制剂能够更好地实现剩余污泥的减量,与污泥龄30天,未投加酶制剂的实验结果相比,保持污泥龄60天,投加酶制剂0.4mL/日的装置污泥减量比例为41%。减量效果显著。对系统出水COD、NH3-N的影响很小,可忽略。系统的SVI明显升高,但仍在合理范围内,不会对活性污泥性质及沉淀效果有影响。由此可见将污泥龄延长与投加酶制剂相结合的方法对该污水处理厂是一种切实可行的污泥减量方法。更多还原

【Abstract】 About 5000 tons of excess sludge is produced annually in one wastewater treatment plant in Jilin City. Currently the sludge is disposed of in landfill after dewatering. However, this approach does not eliminate the pollution fundamentally, and the invention is much costly when rebuilding a new landfill site. Therefore, it is an urgent need for developing excess sludge reduction technology from the points of significantly reducing the hazards of sludge in one hand, and reducing the difficulty and burden of further sludge treatment and disposal in another hand.Considering the above problems, this paper over reviewed the state of the art of current excess sludge reduction techniques in domestic and abroad, especially focused on the researches about the effects of long sludge retention time (SRT) and dosage of enzyme on excess sludge production. The results confirmed the effectiveness of sludge reduction by the combined techniques of extending SRT and enzyme addition. The main achievements from this research are as follows:Extending SRT can effectively reduce the excess sludge production. The 14%of excess sludge can be reduced when SRT is kept at 60 days compared to SRT of 30 days. The effluent COD and effluent NH3-N are slightly affected, but within the range of being neglected. Even the SVI of system is increased significantly, it is still in a reasonable range. When the SRT is kept at 90 days the excess sludge production can be reduced at 27%, but effluent COD is increased apparently. The above results indicate that extending SRT can reduce the excess sludge production,It showing a viable technique in sludge reduction to some extent.Two enzymes are selected by comparing the sludge reduction effect and effluent quality, the results show that 1# enzyme is better than 2# enzyme.1# enzyme can reduce the excess sludge production. Sludge reductions of 19%,28%and 30%can be achieved when enzyme dosage are 0.2mL,0.4mL and 0.6mL daily in a 30 liter aerated reactor. Effluent quality is better after adding enzyme since the effluent COD, effluent NH3-N and SVI are lower than the controlled one. The optimal enzyme dosage is 0.4mL. From the above investigation it clearly shows the sludge reduction effectiveness and improvement of the effluent quality by adding enzyme, suggesting an ideal sludge reduction technique with the easy modification of the existed facilities and simple operation by only adding enzyme in the source of the aerobic tank. Excess sludge reduction can be achieved much better with the SRT extention and enzyme addition combined. Compared to the control,41%sludge reduction can be reached when SRT is kept at 60 days and enzyme dosage at 0.4mL daily in 30L reactor. The sludge reduction effect is apparent with only slight increases of effluent COD and NH3-N. SVI of system is increased significantly, but still in the reasonable range. Therefore, it can be concluded that it is a practical technique for sludge reduction by combining SRT extention and enzyme addition techniques in wastewater treatment plant.更多还原