The first stage is the project establishment stage. At this stage, it is necessary to analyze the necessity and feasibility of project construction according to the requirements of urban municipal planning or environmental protection departments. At this stage, the project is defined as the center. Generally, the project proposal and feasibility study report are prepared by the construction unit or the design and research unit entrusted by it, and the project can only be approved through the demonstration of the national planning department, investment bank or enterprise planning department. For some small-scale projects, only the scheme design of sewage treatment project is compiled, and the project can be established through the demonstration of the investment department. The second stage is the construction stage. Including engineering design, engineering and equipment bidding, engineering construction, completion acceptance and other processes.
Preliminary work of design
The pre-design work is mainly feasibility study, expressed in the form of feasibility study report (large and important projects) or engineering scheme design (small and simple projects), which mainly demonstrates the necessity, technical advancement and reliability of sewage treatment projects and the economic rationality of the projects, and provides scientific basis for the construction of the projects. Feasibility study report is an important basis for national investment decision, and its main contents are as follows.
(1) General project preparation basis, natural environmental conditions (geography, meteorology, hydrogeology), urban socio-economic profile or enterprise production and operation profile; The present situation of drainage system, pollution source composition, sewage discharge status, sewage quality status, project construction principle and scope, construction scale of sewage treatment plant, sewage treatment requirements and objectives (designed inlet and outlet water quality) of a city or enterprise.
(2) the site selection and land use of the sewage treatment plant in the project plan; Comparison of sewage treatment process schemes (comparison of process technology and overall design, analysis of process structures and equipment, technical and economic comparison), water treatment outlet (selection of reclaimed water advanced treatment process); Short-term and long-term integration of the project; Energy-saving, safe production and environmental protection, recommended scheme design (plane 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 ability.
(3) the principles and basis of project investment estimation and financing project investment estimation; Engineering investment estimation table; Fund raising and use plan.
(4) the project schedule.
⑤ Summary of economic evaluation (project scale and processing capacity, total investment, source of funds and use plan); Annual operating cost estimation; Financial evaluation. ⑥ Research conclusions, existing problems and suggestions.
Preliminary design
The main purposes of the preliminary design are: ① to provide a basis for examination and approval, and to further demonstrate the technical advancement, reliability and economic rationality of the engineering scheme; (2) investment control, providing the project budget table. The total estimated value is the main basis for controlling investment, and the budget and final accounts cannot exceed this estimated value; (3) technical design, including the overall design of technology, architecture, power distribution system, instrument and automatic control, the design of some main units, and the demonstration and design of new technologies adopted by various disciplines; (4) Provide construction preparations for demolition, land acquisition, three links (water, electricity, roads) and one leveling (wall) and sign contracts with relevant departments; ⑤ Provide the ordering requirements of main equipment and materials, that is, the basis of technical specifications of equipment and main materials in the bidding contract, including the process requirements, performance, technical specifications and quantity of equipment and main materials in sewage, sludge, electrical and automatic control and laboratory tests. The tasks of the preliminary design include determining the project scale, construction purpose, investment benefit, design principles and standards, individual design of each major and design of main technological structures, project budget, scope and quantity of land requisition for demolition, possible problems and suggestions in construction drawing design. The preliminary design documents shall include design (calculation) specifications, quantities, main equipment and materials, preliminary design drawings and total project budget. The preliminary design documents shall meet the requirements of examination and approval, investment control, construction drawing design, construction preparation and equipment orders's work basis.
1. Preliminary design
(1) design basis ① approval document of feasibility study report; (2) Design power of attorney of the construction unit (Party A); (3) the consent and approval of other relevant departments; ④ List of design data provided by the construction unit (Party A) (name, source, unit and date).
(2) General situation and natural conditions of the city or enterprise ① The present situation and overall planning of the city, or the present situation and development of the production and operation of the enterprise. ② Information on natural conditions A. Meteorology, including temperature, humidity, rainfall, evaporation, freezing period, frozen soil depth, ice temperature, wind direction, etc. B. Hydrology, including function, geographical location, direction, water level, velocity, flow rate, etc. Distribution, depth and utilization of surface water and groundwater. Engineering geology, including geological borehole histogram, foundation bearing capacity, earthquake grade, etc. The area where the sewage treatment plant is under construction. ③ Relevant topographic data, including topographic maps of sewage treatment plants and related areas. ④ Present situation of urban sewage discharge and environmental pollution.
(3) The treatment requires that the sewage discharge should meet the national discharge standards or the requirements of the environmental protection department.
(4) Engineering design ① Design sewage treatment quality and quantity By analyzing the average flow, peak flow, current flow and expected flow of sewage in the drainage system, the design scale of sewage treatment plant (including 20 12 treatment capacity and total treatment capacity) is determined; According to the pollution situation of cities or enterprises, the design water quality index of sewage plant is determined on the basis of analyzing the main pollution sources (monitoring the pollution sources for a certain period of time when necessary) and the monitoring data of mixed sewage. (2) Description of site selection: According to the present situation of the city and the overall planning, specify the principles and reasons of site selection, and explain the topography, geology, land area and surrounding conditions of site selection (that is, three links and one leveling). (3) The description of process selection mainly explains the technological advancement and rationality of the selected process scheme. In particular, it is necessary to explain the superiority (technical and economic aspects) and reliability (technical aspects) of the new technology adopted. ④ Process design description explains the general design (plane and elevation layout) principle of the preliminary design of the selected process scheme, and explains the design (technical characteristics, design data, structural form and size) of the main process structures. (5) The main processing equipment describes the performance structure, materials and main dimensions of the main equipment, especially the technical characteristics, structural forms, principles and dimensions of the new technology equipment.
(5) Design description of auxiliary buildings (office, laboratory, control, power distribution, pharmacy, machine maintenance, etc.). ) and public works of the treatment plant (water supply, drainage, rubber tapping, roads and greening).
(6) Design description of automatic control and monitoring of the treatment plant
(7) The way out for sewage and sludge treatment plants
(8) Existing problems and countermeasures.
2. The bill of quantities includes concrete quantity, reinforced concrete soil quantity, building area, etc. All kinds of buildings (structures) involved in this project and the general plan of the factory.
3. List the equipment and main materials (name, specification, material and quantity) of this project.
4. The project budget book explains the basis of budget preparation, the market supply prices of equipment and main building materials, and other indirect costs. List the total budget table and the budget table of each unit. Explain the total investment of the project budget and its composition.
5. Design Drawings The overall design drawings (general drawing and system drawing) of various disciplines (process, architecture, electricity and automatic control) with the scale of (1:200) ~ (1:1000), and the design drawings of main process structures (plane and vertical) with the scale of (.