Efficient composite phosphorus removal type farmland tail water treatment system and preparation method thereof

Abstract

The invention discloses an efficient composite phosphorus removal type farmland tail water treatment system, which comprises a vegetation layer, a coarse sand layer and a reinforced phosphorus removallayer which are sequentially arranged from top to bottom. The vegetation layer comprises culture soil and vegetation; the coarse sand layer is laid at the bottom of the culture soil; the reinforced phosphorus removal layer comprises a plurality of reinforced phosphorus removal geocontainers and zeolite filled among the reinforced phosphorus removal geocontainers; the reinforced phosphorus removalgeocontainers are lumps formed by mixing sandstone, zero-valent iron, zero-valent aluminum, activated carbon powder and an additive and then performing wrapping with geotextile; wherein the weight percentages of the sandstone, the zero-valent iron, the zero-valent aluminum, the activated carbon powder and the additive are 70-80%, 4-6%, 3-6%, 7-12% and 3-8% respectively; meanwhile, the preparationmethod of the farmland tail water treatment system is improved, the sandstone, zero-valent iron, zero-valent aluminum, activated carbon powder and the additive are mixed according to a certain proportion and then the mixture is coated with geotextile to prepare the reinforced phosphorus removal geocontainers, thus effectively reducing the phosphorus content, suspended matters and other pollutantsin sewage.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to an efficient compound phosphorus removal type farmland tail water treatment system and a preparation method thereof. Background technique [0002] In agricultural production activities, due to reasons such as planting structure, fertilization, drug use, unreasonable management of farmland water, degradation of ecological functions of ditches, and non-recycling of waste, dissolved or solid pollutants, such as soil particles and nitrogen in farmland A large amount of organic or inorganic substances, such as phosphorus, rural poultry manure and domestic garbage, enter rivers, lakes, reservoirs and other places through farmland surface runoff, farmland drainage and underground seepage under the action of precipitation and runoff erosion from non-specific areas. Bays and other receiving water bodies lead to water pollution. [0003] Fertilizers used in agricultural production include ...

AI Technical Summary

Problems solved by technology

Among them, nitrogen and potassium fertilizers are easier to be absorbed by plants, and the absorption rate of phosphorus fertilizers by plants is much lower than that of nitrogen and potassium fertilizers. Therefore, unabsorbed phosphorus fertilizers are accumulated in the soil, and a small part of phosphorus fertilizers is decomposed by microorganisms in the soil. It may be washed into the water body with the rainfall. Once the phosphorus concentration in the water body is too high, it is easy to breed algae and cause eutrophication of the water quality, which will affect the safety of water supply.

Traditional farmland tail water treatment methods mainly use constructed wetland technology. However, although these facilities can effectively reduce indicators such as ammonia nitrogen and chemical oxygen demand (COD) in sewage, the effect on reducing total phosphorus indicators is very limited. Difficult to meet people's requirements for farmland tail water treatment

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