Sewage irrigation system of alternation of wetting and drying with nitrogen and phosphorus removing function

Abstract

The invention discloses a sewage irrigation system of alternation of wetting and drying with nitrogen and phosphorus removing function, wherein the sewage irrigation system of alternation of wetting and drying with nitrogen and phosphorus removing function comprises an irrigation system (1) and a pollution discharge system (2) arranged in the irrigation system (1); the pollution discharge system (2) comprises a sewage taking region (21), a carbon source layer (22), an anaerobic layer (23), a pollution discharge reaction layer (24), a filtering layer (25), a bracket layer (26) and a clean water discharge region (27) orderly arranged in a lateral canal (5) from the upper side to the lower side; the lateral canal (5) has slope, the slope of the pollution discharge system (2) is the same with the slope of the lateral canal (5); and the sewage taking region (21) is provided with a plurality of subsection water gate (28). The sewage irrigation system of alternation of wetting and drying with nitrogen and phosphorus removing function is reasonable in design, high effective in nitrogen and phosphorus removing operation and low in cost; the existing irrigation can be improved for saving the land, and the system is suitable for wide popularization and application.

Description

technical field [0001] The invention relates to a dry-wet alternate sewage irrigation system with the function of removing nitrogen and phosphorus, and belongs to the technical field of water conservancy engineering. Background technique [0002] The annual sewage discharge in the country is about 35 billion cubic meters, but the centralized treatment rate of urban sewage is only 16%. More than 80% of the urban sewage in the country is directly discharged to nearby water bodies without any effective collection and treatment. The amount of ammonia nitrogen discharge in domestic wastewater accounted for nearly 80% of the total emissions. [0003] According to the "National Groundwater Pollution Prevention and Control Plan" (2011-2020) promulgated by the State Council and the Ministry of Environmental Protection, long-term use of sewage irrigation in some areas of my country poses a hazard to farmland and groundwater environments. Ammonium nitrogen, nitrate nitrogen, and nitrit...

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide an irrigation system with sewage treatment capacity to ensure irrigation water quality, reduce farmland environmental pollution, and restore farmland ecology; further, the present invention simulates a paddy field system and utilizes the sewage system during irrigation and non-water The characteristics of alternating wet and dry naturally formed during the irrigation period to remove nitrogen and phosphorus; effectively deal with the problem of water eutrophication while saving costs; further, the present invention uses straw as a carbon source and filter layer, and comprehensively utilizes the nutrient in the irrigated field Straw, straw is easy to get, and the cost is low; further, the present invention can be transformed on the existing irrigation channels, which further saves the land, and realizes decontamination during the water delivery process; and the anaerobic layer of the present invention The expansion material is a material with a large thermal expansion coefficient, which uses the principle of thermal expansion and contraction to create anoxic conditions for anaerobic bacteria

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