Nitrogen and phosphorus removal constructed wetland process technology

Abstract

The invention relates to the technical field of sewage constructed wetland treatment. According to a nitrogen and phosphorus removal constructed wetland process technology, a stabilization pond, a subsurface wetland, a deep purification pond and an enhanced phosphate removal unit are involved. The stabilization pond provides an anaerobic environment and is used for primary pretreatment of sewage, and large-molecular organic matter in water is converted into small-molecular organic matter. Water flowing out of the stabilization pond enters the subsurface wetland, the subsurface wetland is mainly used for removing COD in water and conducting nitration, and ammonia nitrogen is converted into nitrate nitrogen. Water flowing out of the subsurface wetland enters the deep purification pond, the deep purification pond provides an anoxic environment and is used for converting nitrate nitrogen into nitrogen, and nitrogen in water is removed. Water flowing out of the stabilization pond enters the enhanced phosphate removal unit, calcite filler is arranged in the enhanced phosphate removal unit, sewage flows through calcite, and phosphate and other ions in water chemically react with calcium ions to form phosphate precipitate to be finally removed. Through organic integration of the whole process, nitrogen and phosphorus removal of water is achieved on the basis of guaranteeing COD removal.

Description

Technical field: [0001] The invention relates to the field of sewage treatment, in particular to an artificial wetland treatment technology for sewage. technical background: [0002] At present, my country's water resource pollution is very serious. Many surface waters such as rivers and lakes have been polluted to varying degrees, which seriously restricts the sustainable development of my country's economy and endangers the health of the people. With the continuous increase of the country's investment in environmental protection, surface water environment governance and ecological restoration work is also gradually carried out in various places. Among them, the most widely used technology is artificial wetland technology. Due to the low investment, convenient operation and management, and good landscape ecological effect of artificial wetlands, it is very suitable for the treatment of rivers and lakes in large watersheds. [0003] At present, the commonly used constructed...

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Problems solved by technology

[0005] In order to solve the above problems, the present invention analyzes the artificial wetland technology commonly used in China at present, and combines the experience in the actual engineering of the company, mainly through the way of controlling the water depth, to build an aerobic and anoxic environment in the wetland. While achieving the removal of COD in the water body, the problem of low nitrogen removal rate in the constructed wetland technology is solved in a targeted manner. At the same time, on the basis of plant absorption and phosphorus removal, physical and chemical methods are added, that is, the calcite filler area is set. When the water flow When flowing through this area, the phosphate in the water body is equal to the calcium carbonate in the calcite to undergo a chemical reaction to form a stable phosphate precipitate, which can be removed from the water body and strengthen the phosphorus removal effect of the wetland

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