Nano zero-valent ferrum based sewage treatment system, treatment method and preparation method of modified diatomite loaded nano zero-valent ferrum

Abstract

The invention discloses a nano zero-valent ferrum based sewage treatment system, a treatment method and a preparation method of modified diatomite loaded nano zero-valent ferrum. The treatment systemcomprises a reduction treatment tank, a flocculation basin, an efficient sedimentation tank, a filter and a clear water basin which are sequentially connected, wherein the reduction treatment tank isused for treating sewage in the tank through the modified diatomite loaded nano zero-valent ferrum in the tank; the flocculation basin is used for flocculating pollutants in the sewage in the tank through a flocculant; the efficient sedimentation tank has a structure for separating mud and water in the sewage passing through the efficient sedimentation tank; the filter has a structure for trappingthe pollutants in the sewage passing through the filter; the clear water basin is used for adjusting a pH value of the sewage in the clear water basin to reach emission standards. According to the scheme, the nano zero-valent ferrum can fully react with nitrate, and thus, the efficiency of removal of the nitrate is high; meanwhile, the system has no need of strictly controlling pH conditions of reaction and is wide in applicable range; in addition, the consumption of agents is lowered, the operating cost is greatly reduced, the reaction conditions are mild, the process is safe, the cost of investment is low, the process is simple, and the operating maintenance is simple and convenient.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a sewage treatment system based on nanometer zero-valent iron, a treatment method and a preparation method of modified nanometer zerovalent iron. Background technique [0002] At present, the nitrate treatment technologies in sewage mainly include physical and chemical methods, chemical reduction methods and biological methods. [0003] Physical and chemical methods mainly include ion exchange, reverse osmosis and electrodialysis, etc. Physical and chemical methods only transfer or concentrate pollutants, but cannot completely remove them, so they are limited in practice. In addition to the ion exchange method, other physical and chemical methods are usually used for the remediation of small-scale nitrate and nitrogen pollution, and the cost is high, while the ion exchange method denitrification is based on the same-sex ions on the anion exchanger and NO in water. 3- Exchange, so...

AI Technical Summary

Problems solved by technology

The main disadvantage of using the active metal reduction method to remove nitrate is to strictly control the pH value, the main product is ammonia nitrogen, and the nitrogen selectivity is low

The catalytic reduction method uses hydrogen as the reducing agent and metal as the catalyst to reduce nitrate to achieve the purpose of removal. The disadvantage of this method is that hydrogen is used as the reducing agent, which has high cost and high risk.

[0005] The biological method uses organic carbon sources as electron donors and NO 3- As an electron acceptor, the process of converting nitrate into nitrogen under the combined action of nitrous bacteria and nitric acid bacteria has the disadvantages of slow reaction, the need for organic matter as electron donors, complex process, troublesome operation and maintenance, etc.

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