Activated sludge method according to the treatment process is pided into: AB method, SBR method, oxidation ditch method, common aeration method, A / A / O method, A / O method, each with its own characteristics。

   Analysis of the quality of the sewage can be seen 1) influent water quality BOD / COD value of 0。45, the main pollutants for organic matter can be biodegradable, biodegradable, and heavy metals and refractory substances are not exceeded; 2) water pollution is more serious , Water BOD, COD, SS and other indicators of urban sewage is about 1。7 times the average。 According to the local operation of several medium-sized sewage treatment plant engineering process survey, and for the characteristics of the sewage water, combined with water requirements。 In order to ensure that the water quality standards to achieve the premise of maximizing the economic benefits, so the design of the use of biochemical treatment, that is, A2 / O activated sludge method。 The NH3-N concentration of the water body is low, so the requirement of denitrification process is not high, the empirical verification A2 / O activated sludge method can meet the nitrification level of the water body, and the treated water can be reused。

   This design is mainly for the industrial park of sewage, in order to facilitate the collection of sewage from the factory, and in order to save the plant construction land, it will increase the pressure booster pump set in the factory area, the plant is no longer set up to enhance the pump room。 Sewage into the plant after the sewage treatment of structures and processes are as follows:

   1) from the inlet into the sewage treatment system, the thickness of the grid filter trapped in the sewage particle size of the larger solid pollutants;

   2) into the grit chamber to remove the smaller particle size but larger physical particles;

   3) into the primary settling tank for physical settlement, remove part of the SS and insoluble BOD, COD and other suspended substances;

   4) into the A2 / O bioreactor tank, the pool is to remove the sewage BOD, COD, SS, TN, TP the main structure;

   5) into the secondary sedimentation tank, through the secondary settling tank treatment, to achieve mud separation, part of the activated sludge reflux, water outflow into the next treatment structure, the remaining sludge discharge:

   6) through the secondary sedimentation tank out of the water into the disinfection of chlorine, for chlorine disinfection treatment。

   7) The sludge produced in the above-mentioned structures is allowed to enter the sludge concentration tank and the sludge is concentrated, and then sludge cake is formed by the sludge dewatering workshop。

   8) clean water disinfection by disinfection, to meet the water quality requirements, and finally discharged into the nearby rivers。

   In addition to the process design, the design also calculates the detailed parameters of the structure, and equipment selection。 Finally complete the plant floor plan, structure design drawings, elevation drawings and other CAD drawings。 Specific design calculation content attached to the text below, a variety of CAD drawings also included as a map into this design。

目录

第一章 绪论 6

1 设计题目 6

2 设计原始资料 7

3 设计内容 7

4 设计要求 7

5 文献依据 7

第二章 工艺流程 8

1 工艺方案分析 8

2 工艺流程