A treatment system for waste water containing inorganic ammonium salts and a resource treatment method thereof

Abstract

The invention discloses an inorganic-ammonium-salt-containing wastewater treatment system and a recycling method thereof. The recycling method of the inorganic-ammonium-salt-containing wastewater treatment system comprises the following steps: (1) salt-containing wastewater to be treated passes through a grid to intercept large suspended substances; (2) the wastewater subjected to grid treatment enters a buffer pool; (3) a supernate of the buffer pool overflows to a regulating kettle; (4) the effluent water enters a filter; (5) the effluent water enters a buffer tank; (6) the effluent water of the buffer tank enters a preheater so as to be heated, and the heated salt-containing wastewater enters a tube side of an MVR (mechanical vapor recompression) evaporator; (7) cryocondensation effluent water enters a regulating tank; (8) the effluent water in the regulating tank enters an ammonia nitrogen removal system; (9) the effluent water of a Fenton oxidation pool enters a flocculating settling pool; (10) a supernate of the flocculating settling pool is discharged into a middle regulating pool; and (11) the effluent water of the middle regulating pool enters an SBR (sequencing batch reactor) pool. The method has the advantages of simple pretreatment, low solid waste output and favorable sewage purification effect, and can be used for efficiently recycling ammonium salts in the wastewater.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a treatment system for wastewater containing inorganic ammonium salts and a resource treatment method thereof. Background technique [0002] In large-scale industrial production, especially in printing and dyeing, dyestuff and pharmaceutical manufacturing industries, it is often accompanied by the generation and discharge of a large amount of inorganic ammonium salt wastewater. Usually, the ammonium salt content of high-concentration wastewater is as high as 10%, and low-concentration wastewater is also up to 1%. Left and right, if the ammonium salt wastewater is discharged directly, it will not only cause the eutrophication of the water body and bring serious harm to the environment, but also lead to a serious waste of resources. Recovery of ammonium salts in wastewater. [0003] The treatment methods of ammonium salt wastewater mainly include the following types:...

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Problems solved by technology

This process can effectively reduce the probability of sticky tubes caused by long-term operation of the evaporator, but it has the following disadvantages: (1) The pretreatment process is long, and the pH must be adjusted frequently, which increases the operating intensity; (2) The pH of the iron-carbon micro-electrolysis process The value is constantly increasing, and a certain amount of aeration is required at the same time, so the loss of ammonia nitrogen in the ammonium salt-containing wastewater is caused, the total nitrogen content of the recovered ammonium salt is reduced, and the escape of ammonia gas will cause secondary pollution of the surrounding environment; (3 ) After adjusting the pH value of the wastewater, iron-carbon micro-electrolysis and Fenton oxidation are carried out sequentially. Due to the large COD of wastewater and the large load of pretreatment, the output of iron sludge is large, the consumption of iron-carbon and hydrogen peroxide is large, and the operating cost is high.

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