The Design And Implementation Of Small-scale Sewage Treatment Works

In recent years, with the village of urban construction and development, ecology,miniaturization, and the construction of small and medium-sized sewage treatmentfacilities on a variety of sewage and wastewater situ treatment discharge standardsbecome the development trend of sewage treatment, to avoid large the concentrationof emissions of the scale of the ecological load on the receiving water bodies, alsohelp to wastewater reclamation and reuse, to facilitate the financing of investment ininfrastructure, in particular, is emerging in China with the development ofurbanization, many small and medium towns, the sewage collection and emissiondispersion and miniaturization characteristics.In this thesis, access and analyze large amounts of data based on the QingdaoPort Vocational and Technical College sewage，the Dongjiakou ore harbour sewage ofQingdao Port, Qingdao Fuwai Hospital sewage treatment works for example, theprogress of each project water quality, water requirements, technology selection,project investment, operating results and other aspects of the detailed analysis andcomparison of argumentation, in order to choose to provide reference for similarsmall-scale sewage treatment works program, the findings have big practical value.The main results are as follows:1、MBR process overall cost is higher, does not apply to the more backward andless developed regions; However, due to its efficient retention of the membrane, theprocess applies to the SS and ammonia removal requirements of the occasion.2、 the initial investment of CASS process is low, applies tighter capitalunderdeveloped areas; the same time as the main reaction occurred in a CASS cellbody, the process is suitable for long-term planning unit or region; due to its fixedtiming control operation, so poor adaptability of the substantial changes in the qualityand quantity, if water quality, quantity had a greater change, it should make somechange which based on the actual quantity or with a full-time technical staff adjust thePLC automatic control system timely; fixed aeration time and competition betweendifferent microbial growth of nitrifying bacteria are affected, the removal of nitrogen is less than ideal, where the more stringent nitrogen removal requirements forapplications you need to take other measures to strengthen its nitrogen removal.3、Biological contact oxidation process can used for somewhere water qualitydoes not have the special requirements, but the advantages of the process is when itput into operation after the run is relatively simple to control without professionaltraining running control personnel.4、Ports and other high water table or groundwater salinity higher occasions, notsuitable for the construction of the whole underground structures; in all the sewagetreatment engineering design, the flow of sewageshould make every effort to achievegravity flow.