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污泥浓缩池：对污水中以剩余污泥为主体的，污泥浓度高且间隙中的水分不易排出，易腐败析出气体的剩余污泥进行浓缩沉淀。
经过该工艺的处理，出水水质达到《城镇污水处理厂污染物排放标准》（GB 18918－2002）中二级标准。
毕业论文关键词： 三沟式氧化沟；城市污水；出水达标
The design of treatment plant which can daily process 100,000 tons of municipal wastewater
General Description of Design：The significance of this design is to design a municipal wastewater treatment process design. The designed capacity of the water quality daily processing 100,000 tons of urban waste water and sewage treatment plants are as follows: CODcr ≤ 380mg / L, BOD5 ≤ 200mg / L, SS ≤ 310mg / L, NH3-N ≤ 40 mg / L, TN ≤ 60 mg / L, TP ≤ 5.0 mg / L. Wastewater treated effluent indicators required to achieve "urban sewage treatment plant pollutant discharge standard" (GB 18918-2002) in the secondary standard: CODcr ≤ 100mg / L, BOD5 ≤ 30mg / L, SS ≤ 30mg / L, NH3-N ≤ 25mg / L, TN ≤ 20mg / L, TP ≤ 2.0mg / L.
Design Standards:
"Urban sewage treatment plant pollutant discharge standard" (GB 18918-2002)
"Integrated Wastewater Discharge Standard" (GB 8978-2002)
"City sewage treatment plant sludge discharge standard" (CJ 3025-93)
"Sewage Treatment Plant Process Design Manual (Second Edition)"
"Urban sewage treatment plants outbuildings and ancillary equipment design standards" (CJJ 31-89)
Design Principles:
To ensure that the entire system can deal with long-term stable and efficient operation, my design’s choice for advanced is reliable technology and equipment. Under the premise of ensuring water quality standards, as much as possible to save infrastructure investment; in the selection process technology and equipment selection, the choice of management is simple, easy to operate and easy to equipment maintenance equipment; layout reasonable, compact, and try to save an area of ; make full use of the existing pipeline, the use of appropriate materials and technologies; renovation project using suitable pipe network optimization design method to optimize the pipeline layout.
Main technical data
This design uses three oxidation ditch process , it is actually still a continuous flow activated sludge process, just aeration , sedimentation processes in one set, and has run chronologically alternating rotation characteristics of its operating cycle can be treated water to be adjusted according to different , making it run operation tends to be more flexible and convenient . This process is simple , without a separate primary, secondary sedimentation tank and sludge reflux device , the oxidation ditch process of infrastructure investment and operating costs greatly reduced , and to some extent solves the large area of the oxidation ditch shortcomings.
The design specification includes comparison and selection process to determine the wastewater treatment process scheme , the main structure of the design, the overall arrangement of the sewage treatment plant and engineering economic analysis.
Sewage treatment used mainly : the sewage pumping station + grill + grill + fine + oxidation ditch aerated grit chamber + pool disinfection treatment process . Sludge Treatment mainly uses : + sludge dewatering sludge thickening treatment process .
Grill : grill equipment generally used for the treatment of sewage water channels or upgrade sump pump station at the entrance , the main role is to remove the larger suspended or sewage floating debris in order to reduce the processing load on subsequent treatment processes , and to protect the pump , piping, instrumentation and so on.
Sewage pumping station : It is an important part of the sewage system , is characterized by a continuous water flow , water flow is small, but the change amplitude, multi- pollutant content in water . Therefore , sump have enough flood storage volume design, and should consider alternate pump , in addition to minimizing design time environment pollution , the station to provide better management , maintenance conditions . It is generally set at the sewage treatment plant is used to upgrade sewage pumping station , is to provide water power for the subsequent process . Generally , sewage lifting height is tailwater elevation from the discharge of sewage treatment , minus the head loss , pushing down calculated.
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