Method for treating high-ammonia-nitrogen waste water to serve as ammonia desulfurization agents or process water

Abstract

The invention belongs to the technical field of environmental engineering waste water treatment and relates to a method for treating high-ammonia-nitrogen waste water to serve as ammonia desulfurization agents or process water. The method includes the steps: a, hardness adjustment: taking high-ammonia-nitrogen waste water and adding alkali until the total hardness of the high-ammonia-nitrogen waste water is smaller than or equal to 450mg / L to obtain low-hardness waste water; b, addition of water purifying agents for treatment: adding the water purifying agents into the low-hardness waste water, and filtering after reaction is finished to obtain filtrate; c, desulfurization: taking the filtrate as the desulfurization agents to absorb sulfur dioxide so as to generate ammonium sulfate solution; taking the filtrate as process water for ammonia desulfurization. The method has the advantages that the problems of high cost and complexity in treatment process of the high-ammonia-nitrogen waste water are solved while ammonia and nitrogen in the high-ammonia-nitrogen waste water can be fully used for manufacturing ammonium sulfate fertilizers, recycling is realized, and comprehensive utilization of resources and cyclic economy are realized as well.

Description

Technical field [0001] The invention belongs to the technical field of environmental engineering wastewater treatment, and specifically relates to a method for treating high ammonia nitrogen wastewater as an ammonia desulfurizer or process water. Background technique [0002] In coal chemical enterprises, in the production of coal gas, water needs to be used to wash the coal gas to cool down and remove dust, which produces a large amount of washing wastewater-high ammonia nitrogen wastewater, which needs to be discharged or reused after treatment. [0003] The treatment methods for high-ammonia-nitrogen wastewater that meet the discharge standards usually include physical and chemical methods and biological treatment methods. For the removal of ammonia nitrogen from wastewater, physical methods include reverse osmosis, distillation (that is, steam stripping), ammonia stripping, and soil irrigation; chemical methods include ion exchange, breakpoint chlorination, production of ammoni...

AI Technical Summary

Problems solved by technology

The above methods have a long process flow, difficult operation, high investment and operating costs, and poor economy.

[0004] The reuse of high-ammonia nitrogen wastewater after treatment is mainly based on the requirements of the gas production process, and the wastewater is recycled after being treated with chemicals, slag and impurities. A pungent smell, causing environmental pollution

[0005] Most coal chemical enterprises have coal-fired boiler flue gas or other kiln flue gas that need to be desulfurized. When using the ammonia method for desulfurization, ammonia water is needed as a desulfurizer, which increases production costs.