System and process for recycling and zero emission of ammonium sulfate-containing wastewater

Abstract

The invention relates to a system and process for recycling and zero emission of ammonium sulfate-containing wastewater. The ammonium sulfate-containing wastewater is firstly subjected to an evaporation pretreatment system and then subjected to evaporation treatment by an evaporator, evaporated concentrated solution is subjected to crystallization treatment to obtain an ammonium sulfate crystallization product, and generated mother liquor enters the evaporator again for evaporation concentration; wastewater in a storage tank is transported to a RO pretreatment system for pH adjustment, quartzsand filtration, activated carbon filtration and security filter filtration; the filtered wastewater enters a secondary RO treatment system, fresh water generated by RO can meet the reuse standard andbe reused in production; concentrated water generated by the RO is further concentrated by an electrodialysis system, fresh water generated by electrodialysis enters the RO pretreatment system to adjust pH, and concentrated water enters an evaporation system for treatment. The system realizes wastewater treatment and wastewater reuse, fully utilizes water resources and reduces production cost.

Description

technical field [0001] The invention relates to the technical field of resource recycling of hazardous waste, in particular to a system and process for resource recycling of ammonium sulfate-containing wastewater and zero discharge. Background technique [0002] In recent years, the impact of ammonia nitrogen wastewater on the environment has attracted worldwide attention. Due to the shortage of water resources, the recycling and harmless treatment of ammonia nitrogen wastewater has become increasingly urgent. At present, in the prior art, the common treatment methods of ammonium sulfate wastewater are as follows: evaporation concentration method, redox method, ion exchange method, A / O biological method, membrane separation method, stripping method and air stripping method, etc. [0003] It mainly has the following defects: [0004] (1) The evaporation and concentration method does not fully consider the complexity of the wastewater components. If the ammonium sulfate wast...

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Problems solved by technology

Chlorine oxidation consumes a large amount of chlorine and is prone to secondary pollution. Catalyst regeneration in catalytic oxidation is also prone to secondary pollution

[0006] (3) The ion exchange resin used in the ion exchange method needs to be regenerated frequently, the drug consumption is large, and the operating cost is high

[0007] (4) The A / O biological method has a good treatment effect and no secondary pollution, but requires a high concentration of organic matter in the wastewater, and cannot directly treat the ammonium sulfate wastewater discharged from the chemical industry

[0008] (5) Membrane separation method uses hollow fiber membrane to separate NH 3 Separation, by-products are generated through HCl absorption, the treatment effect is good, but the disadvantage is that the equipment depreciation is fast, the cost is high, and the operating cost is high

[0009] (6) Blow-off method uses air to blow off under alkaline conditions, so that volatile substances such as ammonia nitrogen are continuously transferred from the liquid phase to the gas phase. The traditional blow-off method has the disadvantages of secondary pollution and high energy consumption

[0010] (7) The gas stripping method utilizes steam under alkaline conditions to remove NH 3 Extraction, with the advantages of small footprint, flexible operation, and high denitrification rate, is currently the mainstream method for treating ammonia nitrogen-containing wastewater, but this method is not suitable for the treatment of weakly acidic ammonium sulfate wastewater

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