Method for removing sulfate radical in waste water

A sulfate radical and waste water technology, applied in the field of environmental engineering, can solve the problems of few applied research reports
CN101407356AInactive Publication Date: 2009-04-15CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CENT SOUTH UNIV
Publication Date
2009-04-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a sulfate radical wastewater treatment method by using a complex salt method, proposing that hydration aluminum nitrate and calcium hydroxide are taken as removing agents to remove the sulfate radical ions in the wastewater. Al (NO3)3 question mark 9H2O is added into metallurgy and mining industry sulfate radical wastewater with the initial concentration of 1300 to 2000mg / L according to the mol ratio of 0.8-1.1:1 of SO4<2-> / Al<3+>, reaction temperature is controlled at 20-40 DEG C, the pH value of the calcium hydroxide regulation system is 9-12, stirring reaction is carried out for 30-90min, SO4<2-> in the system, Ca<2+> and Al<3+> form compound Ca6Al2(SO4)3(OH)12 question mark 26H2O (ettringite) precipitation, then solid-liquid separation is carried out, and purifying water with water sulfate radical ion concentration of less than 100mg / L is obtained. The invention has the advantages of simple operation, high reaction speed, small temperature affect, highly-efficient treatment and the like.
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Description

technical field

[0001] The invention belongs to the field of environmental engineering and relates to a method for treating sulfate wastewater, in particular to a method for removing sulfate ions in wastewater by a double salt method. Background technique

[0002] A large amount of high-concentration sulfate wastewater exists in mining, metallurgy, food, and pharmaceutical industries. These wastewaters are directly discharged into water bodies without treatment, which will cause a series of hazards, such as: ① Corrosion of pipes. In all kinds of water pipes, it will directly reduce the resistance of water and increase corrosion, and indirectly affect the circulation of sulfate-reducing bacteria and the spread of biological corrosion; 2. Excessive sulfate radicals can cause foul odors in water bodies and affect the senses of water. Properties and use; ③ Excessive sulfate is not conducive to crop growth and salinization of the land; ④ Drinking water containing sulfate has a bi...

Claims

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