文档介绍：摘要
根据兰州交通大学环境与市政工程学院下达的设计任务,对--市污水处理进行设计
计算。经综合考虑后,本设计主体处理构筑物采用三沟式氧化沟,经过处理后使污水达
到国家的二级排放标准。
通过市政管网收集的污水在通过粗格栅去除大的悬浮杂质后,由提升泵站将污水提
升到污水处理厂。在经过细格栅后,进入竖流式沉砂池将污水中较大的无机颗粒去除。
而后进入三沟式氧化沟,利用活性污泥对污水进行脱氮除磷,降低污水中的 BOD、COD。
处理后的污水进入接触池消毒,达到排放标准。对氧化沟内产生的污泥首先进入浓缩池
浓缩,在经带式压滤机压滤脱水后外运填埋。
设计中对整个处理流程的各主体构筑物如格栅、竖流式沉砂池、三沟式氧化沟、接
触池等进行了详细、系统的设计计算和说明。理论上给出了这个流程中 BOD、COD、的去
除率及脱氮除磷的效率。在泥路中,对浓缩池、脱水机进行设计计算和说明。再结合定
西市当地的地形和设计规范,对污水处理厂进行平面布置和高程计算,从而系统的确定
各处理构筑物的标高及布置。
污水经过各处理构筑物后,达标排放至农灌渠,从而缓解---市的用水危机,并改
善定西市的环境问题。
关键字:城市污水三沟式氧化沟生物处理脱氮除磷

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1
Abstract
According to the design mission in environment engineering college of the
Lanzhou Jiaotong Univesity, the calculation is carried out for the municipal
sewage in-----i city. After consideration, the triple oxidation ditch is adopted
in this design, the effluent is made to attain The Second Discharge Standard
Of The Nation.
After removing the miscellaneous in municipal sewage which is collected by
by the thick space grid . Then the municipal sewage is pumped to the
plant . After passing the thin bar, the municipal es into the sand
sinking pond to take off the large abiograin. Then entering to the triple
oxidation ditch, getting rid of the nitrogen and the phosphor byactiviated sludge,
at the same time BOD, COD is reduced. At last,es into the contact pool
to antisepsis,making the effluent be up to the standard of the discharge.
Collected in the triple oxidation ditch, the mud is sended to thicking tank first,
then it is pressed into piece by the straining dehydrate machine and carried
outside.
The major content of this design is about the calculation and introduction
of main structures such as pump station, grille, desilting basin, , contact tank,
thicking tank, the triple oxidation ditch ,sludge digestion clamer, sludge
impoundment in detail and systematically, which are parts of the procedure. The
removal efficiency of BOD,COD,denitrification and ph