给水排水 免费毕业论文
摘要：通过试验发现生物系统用排除剩余污泥方式除磷的给水排水 免费毕业论文能力有限，当进水TP≥5mg/L时要保证出水TP≤0.5mg/L是困难的给水排水 免费毕业论文。采用活性污泥外循环方式对释磷的污泥进行回流，通过提高SBR系统污泥浓度的方式来提高除磷能力的试验表明：当MLSS=5g/L、循环污泥量=1/8系统污泥总量时，在进水TP≤11mg/L、TN=45mg/L的情况下仍能保证出水总磷达到一级排放标准，而且该系统出水NH3-N≤3.6mg/L，对总氮去除率≥86%，同时获得了最佳的除磷和脱氮效果。
关键词：活性污泥 污泥外循环 SBR系统 除磷 脱氮
中图分类号：X703
文献标识码：
A
文章编号：1000-4602(2002)05-0001-05
Biological Phosphorus Removal
Capability in SBR System Using External Recycle of
Activated Sludge
JI Fangying,LUO
Guyuan,YANG Qin,LUO Ning
(School of Urban Construction and
Environmental Engineering,Chongqing University
,Chongqing 400045,China)
Abstract：It was found through test that
there is limited capability for phosphorus remova l by
means of excess sludge wastage in biological system,and
it is difficult for effluent to achieve TP≤0.5mg/L in
the case of influent of TP≥5mg/L. A test was made in
which the phosphorus-released sludge was returned by
means of external recycle of activated sludge and
phosphorus removal capability was impr oved by
increasing sludge concentration in SBR system.The
results show that when MLSS is 5mg/L,and recycled sludge
quantity is 1/8 of total sludge amount i n the system
with TP≤11mg/L and TN=45mg/L in influent,total
phosphoru s in effluent can certainly reach the grade 1
of integrated wastewater discharge standard with
NH3-N≤3.6mg/L and TN removal rate≥86% in
effluent,and th us obtaining the optimal result in
simultaneous removal of phosphorus and nitrog
en.
Keywords:activated sludge;external
recycle of sludge;SBR system;phosphorus removal;
nitrogen removal
目前生物除磷的效果不够理想，通过分析发现：①根据生物除磷理论，要获得好的除磷效
果通常需控制较短泥龄［1］，而目前城市污水的有机物浓度越来越低，在短泥龄的情况下生物系统MLSS也较低，从而导致排除的剩余污泥总量少，磷的绝对去除量难以提高。早在1959年Srinzth的研究就证明了除磷速率和污泥浓度有关，Finstein也认为当污泥
浓度较高时生物系统除磷效率更高，因此如何提高系统污泥浓度是一个值得关注的问题。②系统泥龄短、污泥浓度低的生物条件不利于硝化和反硝化反应的顺利进行，因此在生物系统
中尤其是SBR系统往往不可能同时获得最佳的除磷脱氮效果；③富磷污泥以及污泥浓缩池上清液的妥善处置还是一个亟待解决的问题。
笔者拟采用间歇进出水、间歇曝气的SBR工艺，利用活性污泥外循环技术，通过提高污泥浓度的方式来提高系统的除磷能力，最终实现生物除磷脱氮效果最佳的目的。
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