1. When rainwater and sewage are separated, the sewage will be conveyed to the sewage treatment station for treatment;
2. When rainwater and sewage are combined, the combined sewage will be conveyed to the sewage treatment station for treatment; in front of the sewage treatment station, it is appropriate to set up the intercepting well to exclude the combined sewage in rainy seasons;
3. The sewage treatment station can adopt biochemical treatment technologies such as artificial wetland, biofiltration tank or stabilizing ponds, etc., and can also adopt other treatment technologies which have engineering examples or mature experiences according to the local conditions. Local conditions, the use of other treatment technologies with engineering examples or mature experience.
Artificial wetland is suitable for treating pure domestic sewage or combined rainwater and sewage, covering a large area, and it is suitable to adopt two-stage tandem connection; the plane shape of biofilter is suitable to adopt circular or rectangular shape. The filler should be firm, corrosion-resistant, high-strength, with large specific surface area and high porosity, and it is suitable to use inorganic filter materials such as gravel, pebbles, slag and coke.
Geography and technical conditions allow, village sewage can be considered to use wasteland, waste land and pits, depressions and other stabilization ponds treatment system. Used for secondary treatment of stabilization pond system, the scale of treatment should not be greater than 5000m3 / d.
The effluent from the sewage treatment station should be consistent with the current national standards, "urban wastewater treatment plant pollutant discharge standards," the relevant provisions of the national standard; effluent from the sewage treatment station for irrigation, should be consistent with the current national standards, "Agricultural Irrigation Water Quality Standards," the relevant provisions of the national standard. Sewage treatment and utilization of many methods, the choice of options should consider the following factors:
1, environmental protection requirements for the degree of treatment of sewage;
2, the amount of sewage and water quality;
3, investment capacity. Sewage treatment technology, is the use of various methods to separate the pollutants contained in the sewage, or pollutants into harmless substances, so that the sewage is purified.
Extended information:
The contents of the trial operation of sewage treatment works:
(1) through the trial run to test the quality of civil construction, equipment and installation works, the establishment of the relevant equipment file material, the relevant machinery, equipment and instrumentation design reasonableness, operation operation precautions and other recommendations.
(2) some general or specialized equipment with load operation, and test its capacity. Such as pumps to enhance the flow and head, blower air volume, pressure, temperature, noise and vibration, aeration equipment oxygenation capacity or oxygen utilization rate, scraping (row) mud mechanical stability, the effect of protective devices, scraping (row) mud effect.
Trial run of sewage treatment project requirements:
(1) single treatment structure trial run, required to achieve the design of the treatment effect, especially the use of biological treatment works, to cultivate (domestication) out of the microbial sludge, and to achieve the effect of the treatment on the basis of finding the best operating process parameters.
(2) on the basis of trial operation of individual facilities, the joint operation and acceptance of the entire project. Ensure that the sewage treatment can meet the discharge standards.?
Baidu Encyclopedia - Wastewater Treatment