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Thesis Advisor吴振斌
Degree Grantor中国科学院水生生物研究所
Place of Conferral水生生物研究所
Keyword膜生物反应器 复合废水 化学除磷 硫酸铝
Abstract膜生物反应器技术以占地面积小、处理高效、操作简单而广泛应用于高浓度及难降解污水的处理中。它对有机物、悬浮固体的去除效果甚佳,但处理后的出水氮(N)、磷(P)浓度偏高。化学除磷具有操作简便而且除磷效果好的优点。 一体式膜生物反应器(SMBR)作为对象,分别对SMBR在优化条件下的运行效果、化学絮凝剂的筛选以及硫酸铝对MBR化学强化除磷的效果等方面开展研究工作,为MBR的化学除磷提供了理论依据。 具体结果如下: 1、在活性污泥浓度7.0±0.5g/L,曝气量6±0.5m3/h,泵抽吸/暂停时间比为4:1,污泥停留时间25~30d,温度在25~35℃的最优工况条件下,综合污水经处理后主要指标可达到一级排放标准(GB18918-2002),但对P的平均去除率只有55.6%,出水磷浓度大于1mg/L。 2、通过对硫酸铝(Al2(SO4)3)、氯化铁(FeCl3)、聚合氯化铝(PAC)、聚丙烯酰胺(PAM)的强化除磷效果研究,结果表明硫酸铝的预处理效果最稳定,且效果较好;仪器的最佳操作条件为快搅200rpm1~2分钟;硫酸铝的化学除磷主要是以SRP和PP去除为主。 3、通过连续投加硫酸铝,开展了MBR系统对复合废水的化学强化除磷研究,结果发现:系统对磷的去除率显著提高,出水的TP的浓度稳定在1.0mg/L以下,均达到一级排放标准(GB18918-2002);MBR系统对COD、NH3-N、TN的平均去除率分别为97%、96.6%、67.7%。
Other AbstractThe membrane bioreactor (MBR) technology, which has the advantages of small footprint, high treatment effect and easy management, was widely applied to the high concentration and non-biodegraded wastewaters. However, its low removal rates of nitrogen and phosphorus hinder its wide application in some circumstances. The chemical measurements for removing phosphorus were easy for application and could improve the phosphorus removal rate effectively. The submerged membrane bioreactor (SMBR) was chosen as the typical representative. The removal efficiencies for MBR under optimal operational conditions, the studies of optimal chemical coagulant, together with the effects of Al2 (SO4)3 on the purification effects of wastewater in a continuous SMBR system, were studied. The exact results were as following: Firstly, under the optimal operational conditions(MLSS=7g·L-1, JV = 10L·m-2·h-1, Qgas=6m3·h-1, tp/tb= 4min/min, Ar/Ad=1.7m2/m2, temperature=25~35℃), most of the chemical parameters of the effluent in the SMBR could meet with the requirements for Class I of integrated wastewater discharge standard(GB18918-2002), while the average removal rate of TP was only 55.6% , and the phosphorus concentration of effluent was over 1mg/L. Secondly, four different coagulants: Al2 (SO4)3, FeCl3, PAC and PAM were studied for their phosphorus removal abilities in batch test. It showed that Al2 (SO4)3 was the best choice for the removal of phosphorus, with the advantages of stable and high treatment performance. The optimal operating condition was mixed with 200 rpm in 1-2 minutes; and the main forms for removal of phosphorus were SRP and PP. Thirdly, the removal effects of phosphorus in the SMBR was studied by continuous addition of certain concentration of Al2 (SO4)3, the results indicated that the addition of Al2 (SO4)3 could significantly improve the removal ability for phosphorus, and the concentrations of phosphorus in the effluent during the experimental period were within 1mg/L, which met with the requirements for Class I of integrated wastewater discharge standard (GB18918-2002). Meanwhile, the average removal rates of COD, ammonia and TN were 97%, 96.6% and 67.7%, respectively.
Document Type学位论文
Recommended Citation
GB/T 7714
袁莉英. 膜生物反应器化学强化除磷研究[D]. 水生生物研究所. 中国科学院水生生物研究所,2008.
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