Medium composite type artificial wetland sewage processing system and method

Abstract

The invention discloses an effluent processing system and method of dielectric compound artificial wetland, which is characterized by the following: removing solid suspension in the effluent; setting sedimenting pond of effluent elevating pump with wetland plant, multi-layer dielectric layer, liner, substrate, water collecting device, distribution device to connect sedimenting pond, control well of wetland level and self-control system of wetland water distribution; setting fine stone, sand and rough stone as multi-layer dielectric layer; improving aerobic processing efficiency of effluent.

Description

technical field [0001] The invention relates to sewage treatment technology, in particular to a technology for sewage treatment using a media composite artificial wetland. Background technique [0002] In the current artificial wetland sewage treatment technology, it occupies a large area and has a good decontamination effect. In the Chinese utility model patent with the patent application number 02208448.7, the name is artificial wetland plant bed, due to the use of peat as the plant Growth medium, and only through the absorption of plants to remove pollutants in water, greatly reducing the ability to remove pollutants in sewage, and industrial wastewater has its special substance content (slightly acidic, or alkaline, or high metal content ), its process treatment is not targeted and does not have universal applicability. The land use area is large, the practical applicability is not high, and there is no economic benefit. In the Chinese utility model patent with the pat...

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Problems solved by technology

The technical disadvantages of this method are: 1) If the aeration tank is not well controlled during operation, it is easy to generate odor and affect the surrounding environmental sanitation. This is mainly because the aeration tank operates under anaerobic conditions, resulting in Odor gases such as hydrogen sulfide and feces are produced; 2) When the requirements for phosphorus and nitrogen removal are high, the activated sludge method cannot effectively remove nitrogen; 3) The sludge yield is high, and the heart part of the activated sludge method is exposed The air tank will generate a large amount of sludge, and the content of organic matter in the sludge is high, which brings more problems to the final stabilization and disposal of the sludge; 4) The operation and maintenance technology is difficult, especially for small and medium-sized sewage Treatment plants, due to large fluctuations in water quantity and quality, are prone to shock loads, resulting in sludge swelling and resulting in operational failure

[0004] In addition, this method also has economic disadvantages, that is, expensive infrastructure and operating costs: the sewage treatment plant using the activated sludge method can only reduce the treatment cost per ton of water if it is built on a certain scale, which results in the need to build a large sewage treatment plant , that is, the capital cost of one-time investment is very high; the operating cost is also very high, and the annual operating cost of an activated sludge process is about 10% of its capital investment (for example, a sewage treatment plant with a capacity of 100,000 tons / day, its infrastructure The investment is 150 million yuan, and its annual operating cost is about 12-15 million yuan) so some cities in our country have built sewage treatment plants, but they can't run, or can't run completely, the reason is the lack of operating funds

[0005] In general, the disadvantages of the conventional centralized sewage treatment process are: high one-time infrastructure investment, high daily operating costs, more demand for supporting facilities, inability to achieve point pollution point treatment, easy to generate odor and cause air pollution, deodorization The effect of phosphorus and nitrogen removal is not very good (only 20-40% in conventional), and the daily maintenance technology is difficult;

[0006] A constructed wetland sewage treatment station built in South China has greatly reduced its sewage treatment capacity due to its immature basic technical concept and improper selection of materials for its substrate. The hidden danger of pretreatment is that as the use time increases, more and more chemical agents are deposited in the matrix, which will destroy the working principle of the constructed wetland, resulting in a continuous decline in the decontamination capacity of the constructed wetland, and chemical secondary pollution of water quality and soil. , does not have long-term effective use, and its investment and operating costs are also greatly increased

[0007] The problems of other existing constructed wetlands are: low decontamination efficiency per unit area, large land occupation, low effective utilization rate of land, no long-term use, and some secondary pollution problems have not been properly solved (such as odor, water quality, etc.) and soil chemical secondary pollution), higher investment costs

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