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设计总说明：本设计所涉及污水主要是来自该地区周围居民区的生活污水与一小型牲畜饲养场的饲养废水，污水量为1万m3/d，CODcr=800mg/L、BOD5=300mg/L、SS=500mg/L、NH3-N=40mg/L、TN=60mg/L、TP=5.0mg/L。22263
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经过对各生物法处理工艺的研究比较，确定采用A/O工艺以及当出水水质达不到排放标准时采用后续的三级处理，以达到脱氮、除磷、降解有机物，获到更加干净清澈的出水水质的目的。A/O生物反应池将反硝化段设置在系统的前面，以污水中的有机物为碳源，曝气池混合液中含有大量硝酸盐，通过内循环到回流，在缺氧池中脱氮；最后在混合反应池中加入硫酸亚铁药剂对残留的悬浮固体、胶体物质以及磷进一步处理反应，通过砂滤池过滤混合反应池中的沉淀物，达到进一步净化水质的目的。
根据确定的工艺流程，设计通过对格栅、平流式沉砂池、调节池、初沉池、A/O生物反应池、二沉池、混合反应池、砂滤池和污泥浓缩池等构筑物的主要尺寸的设计计算、水力损失计算及管路的计算，完成设计说明书、工艺流程图(含高层布置)、平面布置图和主体构筑物单体图。
本设计具有技术上可行、经济上合理的效果。投资费用为2315.75万元，运行费用439.9万元/年。每吨水处理费用为0.41元。本设计具有基建费用及运行费用较低，对现有设施的改造较容易，运行稳定，占地面积小，处理效果较好，二次污染少等优点，确保污水处理能够达标排放。污水处理构筑物整体布置紧凑、合理，以实用和美观相结合的总布成花园式污水处理厂，采用目前国内成熟、实用的处理工艺。论文网
城市污水经过该工艺处理以后，预计可达到《城镇污水处理厂污染物排放标准》(GB8978-2002)中的排放标准，即CODcr≦100mg/L；BOD5≦20mg/L；SS≦100mg/L；NH3-N≦8mg/L；TN≦20 mg/L； TP≦3 mg/L，每年削减向环境排放的COD为10220吨。达到消除污染、实现保护环境、造福人类的目的。
毕业论文关键词： 污水处理；A/O处理工艺；活性污泥法；脱氮
Optimized design of multistage biochemical treatment process for 10000m3/d of municipal sewage treatment engineering
General information of the design：This design is mainly involved in wastewater from domestic sewage in the region.The initial design plans: The amount of sewage is 10000 m3/ d. The indicator of waste water quality standard is CODcr=800mg/L、BOD5=300mg/L、SS=500mg/L、NH3-N=40mg/L、TN= 60mg/L、TP=5.0mg/L.
By comparing the research of several biology treating processes, the design uses the Anaerobic/Oxic Process and the following three stage treatment,to remove nitrogen,phosphorus,degradation of organic compounds,get more clean and clear of water quality.
Anaerobic/Oxic Process is mainly the denitrification reaction with organic substances as carbon source in wastewater, a lot of nitrate containing mixedliquid in the aeration tank, the inner circulation to the anoxic tank for denitrification in it.Finally,the addition of ferrous sulfate for suspended solids, chemical residues of colloids and phosphorus the further processing reaction in themixed reaction pool, then through the sand filter to mixed sediment, for further purify the water quality.
In accordance with the established process, the design selects the process parameters of structures (including the grating, the horizontal flow sedimentation tank, regulating tank,the primary settling tank,A/O biological reaction tank,secondary sedimentation tank,a mixed reaction tank,sand filter and sludge concentration tank) and calculates the main size,the hydraulic loss, and finished of introduction of design process,process flow diagram,factory layout and main monomer structure map.
The design is technically feasible and economically reasonable results. The project cost 23.15million yuan, invest-ment, operating costs 4.399million yuan/ year. Equivalent to the sewage treatment costs 0.41yuan/m3.The whole process designed can effectively save the project investments, reduce processing costs, reduce the space with a total investment of less stable, to ensure that emissions from waste-water reach the standard and it is a simple process.The design strictly follow countries related regulations,specification and standard which ensure that the processing water quality index reached the appropriate countries emissions standard,refered related design manual and other literature information;the layout of waterwater treatment device is compact and smooth ,meanwhile,it is supposed to reduce occupied area as far as possible,adhere to the total chief principles by combination of practical and beautiful phase,select simple process。
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