Denitrification purification method for wastewater containing high concentration nitrate ions

A nitrate ion, high-concentration technology, applied in the field of water treatment, can solve the problems of inability to meet the discharge water quality, low nitrate ion removal rate, etc., and achieve the effect of facilitating operation and management and increasing impact load resistance.

Active Publication Date: 2013-10-16
上海宝汇环境科技有限公司
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the removal rate of nitrate ions in the biochemical treatment of wastewater is low, which cannot meet the requirements of the discharge water quality. In order to overcome the above shortcomings, a method for denitration and purification of wastewater containing high-concentration nitrate ions is provided

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  • Denitrification purification method for wastewater containing high concentration nitrate ions
  • Denitrification purification method for wastewater containing high concentration nitrate ions

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[0034] The present invention is described in detail below in conjunction with accompanying drawing:

[0035] All reagents used in the examples are commercially available.

[0036] The water volume of a steel pickling wastewater is 100m 3 / h, after neutralization and precipitation pretreatment, the water quality is pH=7.5, Cr 6+ =0.2~0.5mg / L, T-Fe=1~5mg / L, T-Zn=0.5~2mg / L, Ca 2+ =800~1200mg / L, F - =5~10mg / L, NO 3 - =1000~2000mg / L, the nitrate-containing wastewater is passed through such as figure 1 The denitrification purification method for wastewater containing high-concentration nitrate ions shown is purified. The denitrification and purification method for wastewater containing high-concentration nitrate ions sequentially includes a regulating tank, a mixed flocculation tank, a physical and chemical sedimentation tank, a pH adjustment tank, a first-stage anoxic pond, a second-stage anoxic pond, an aerobic pond, and a biochemical In the sedimentation tank, the first-st...

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Abstract

The invention belongs to the technical field of water treatments, and particularly relates to a denitrification purification method for wastewater containing high concentration nitrate ions. The method comprises that denitrification bacterial adopts a carbon source as an electron donor in an anoxic tank filled with nitrate-containing wastewater to convert nitrate ions into nitrogen gas and concurrently produce a large amount of alkalinity, wherein the anoxic tank comprises a first-segment anoxic tank and a second-segment anoxic tank, effluent of the first-segment anoxic tank enters the second-segment anoxic tank, and an acid regulation agent is poured at the front end of the second-segment anoxic tank to adjust the system to achieve weak alkality. According to the technical scheme, the acid regulation agent is poured at the front end of the second-segment anoxic tank to control alkality of the system and easily carry out a denitrification reaction of the second-segment anoxic tank, a removal rate of the nitrate ions is substantially increased and a biochemical reaction effect in the anoxic tank is substantially improved through the second-segment anoxic tank, and drainage requirements are met.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for denitration and purification of wastewater containing high-concentration nitrate radicals. Background technique [0002] As an industry with high energy consumption and high emissions, the iron and steel industry bears a major responsibility in the work of energy conservation and emission reduction advocated by the global low-carbon economy. In the current situation of scarcity of fresh water resources and global advocacy of low-carbon economy, the discharge standards of wastewater are becoming more and more stringent. From the 1st, the direct discharge target of total nitrogen in wastewater will be below 15mg / L. [0003] When nitric acid and hydrofluoric acid are used as pickling medium in the pickling process section of a steel factory, the wastewater is affected by the pickling medium and contains a large amount of NO 3 - , heavy metal ions,...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 石驰王万俊张建忠
Owner 上海宝汇环境科技有限公司
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