Sewage treatment design

Sewage treatment project is an important part of urban municipal construction, industrial enterprise construction or sewage treatment. Its construction must be carried out according to the national capital construction procedures. The current capital construction procedures are generally divided into several steps: project proposal, project feasibility study, project engineering design, project and equipment bidding, project construction, completion acceptance, operation commissioning and standard acceptance. These construction steps basically include the whole process of project construction, and they can also be divided into three stages.

The first phase of the project project phase. At this stage, the necessity and feasibility of the project construction shall be analyzed according to the requirements of the municipal planning or environmental protection department. This stage is centered on the determination of the project. Generally, the construction unit or the design and research unit entrusted by it prepares the project proposal and the project feasibility study report. The project can be established through the demonstration of the national planning department, investment bank or enterprise planning department. For some small-scale projects, only the sewage treatment project plan design is prepared, and the project can be established through the demonstration of the investment department. The second stage of engineering construction phase. Including engineering design, engineering and equipment bidding, engineering construction, completion and acceptance process. Preliminary work of design The preliminary work of design is mainly feasibility study, which is expressed in the form of documents of feasibility study report (large and important projects) or engineering scheme design (small and simple projects). It mainly demonstrates the necessity of sewage treatment project, the advancement and reliability of process technology, and the economic rationality of the project, so as to provide scientific basis for the construction of the project. The feasibility study report is an important basis for national investment decision-making, and the main contents are as follows.

① General Discussion Project preparation basis, natural environmental conditions (geography, meteorology, hydrogeology), urban social and economic overview or enterprise production and operation overview; current situation of urban or enterprise drainage system, pollution source composition, sewage discharge status, sewage water quality status, project Construction principles and construction scope, construction scale of sewage treatment plant, sewage treatment requirements objectives (design inlet water and outlet water quality).

② engineering scheme sewage treatment plant site selection and land use; sewage treatment process scheme comparison (comparison scheme process technology and overall design, process structure and equipment analysis, technical and economic comparison), treatment water outlet (reuse water depth treatment process selection); engineering short-term and long-term combination of problems; energy saving, safety production and environmental protection, recommended scheme design (plan and elevation design of sewage sludge and reuse water treatment process system, main process equipment and electrical automatic control, civil engineering, public works and auxiliary facilities); production organization and labor capacity.

③ Principles and basis for project investment estimation and financing project investment estimation; project investment estimation table; financing and use plan.

④ Project schedule.

⑤ General economic evaluation (project scope and processing capacity, total investment, source of funds and use plan); annual operating cost estimate; financial evaluation. Research conclusions, problems and recommendations.