Ammonia-nitrogen wastewater treatment device and method

Abstract

The invention provides an ammonia -nitrogen wastewater treatment device which comprises a filtering device, an alkalization tank, a removal device and a circulating pump, the filtering device, the alkalization tank, the removal device and the circulating pump are sequentially connected to form a circulating structure, and the removal device comprises a shell wall, an absorption liquid inlet pipe, an absorption liquid outlet pipe and a separation membrane. An input cavity is formed between the shell wall and the separation membrane, an absorption cavity is formed in the separation membrane, the absorption cavity is filled with acidic absorption liquid, and the separation membrane layer is a hydrophobic separation membrane; and the device is reasonable and simple in structural arrangement, can effectively remove, enrich and recover ammonia nitrogen in wastewater, and has the characteristics of low investment, small occupied area, no secondary pollution and high absorption efficiency, and the ammonia nitrogen is converted into ammonium salt through absorption and can be recycled.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to an ammonia nitrogen wastewater treatment device and method. Background technique [0002] With the rapid development and growth of chemical fertilizer, petrochemical, pharmaceutical, food and other industries, the resulting high ammonia nitrogen wastewater has also become one of the constraints on the development of the industry. Ammonia nitrogen is one of the important causes of pollution, especially the high concentration of ammonia nitrogen wastewater. The discharge of a large amount of ammonia nitrogen wastewater into the water body not only causes the eutrophication of the water body, causes the water body to be black and smelly, but also increases the difficulty and cost of water treatment, and even has a toxic effect on humans and organisms. [0003] The current treatment methods mainly include stripping method, precipitation method, chemical oxidation method,...

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Problems solved by technology

[0002] With the rapid development and growth of chemical fertilizer, petrochemical, pharmaceutical, food and other industries, the resulting high ammonia nitrogen wastewater has also become one of the constraints on the development of the industry. Ammonia nitrogen is one of the important causes of pollution, especially the high concentration of ammonia nitrogen wastewater. The discharge of a large amount of ammonia nitrogen wastewater into the water body not only causes the eutrophication of the water body, causes the water body to be black and smelly, but also increases the difficulty and cost of water treatment, and even has a toxic effect on humans and organisms.

[0003] The current treatment methods mainly include stripping method, precipitation method, chemical oxidation method, and biological denitrification method. The stripping method uses the gas-liquid equilibrium relationship between the gas phase concentration and the liquid phase concentration of ammonia nitrogen to separate, but the power consumption is too large; the precipitation method Removing ammonia nitrogen in wastewater by adding a precipitant requires a large amount of precipitant, and the effluent does not meet the discharge standard, so secondary treatment is required; the chemical oxidation method uses a strong oxidant to oxidize ammonia nitrogen into nitrogen, but residual chlorine removal facilities must be attached. Additional costs are added; the biological denitrification method uses microorganisms to convert ammonia nitrogen into nitrogen, which occupies a large area and has strict requirements for pretreatment of effluent; common high-concentration ammonia nitrogen wastewater treatment methods are inseparable from high investment and high operating costs. Treatment process

[0004] Compared with traditional processes such as stripping, the superhydrophobic membrane ammonia removal process has the advantages of low investment, low operating costs, less land occupation, no secondary pollution, ammonia nitrogen can be recycled into ammonium salts through absorption, no scaling, and high removal rate High, easy operation and maintenance, etc. The hydrophobic membrane is the key to the process. On the one hand, the transmission flux is limited. On the other hand, the low surface energy substances on the surface of the superhydrophobic material are easy to degrade under environmental stimuli, and the superhydrophobic surface structure is easy. Damaged by mechanical friction or scraping and loses its superhydrophobic properties

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