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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

Inactive Publication Date: 2009-04-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, these methods are mainly limited to the removal of sulfate radicals in brine in the chlor-alkali production process, and there are very few application research reports in the fields of metallurgy, mining and other industrial wastewater treatment.
In addition, there are also literature reports on the use of goethite, pillared montmorillonite, and roasted hydrotalcite to adsorb and remove sulfate ions in water. However, such methods are greatly affected by factors such as solution pH and operating temperature, and are still in the experimental research stage.

Method used

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  • Method for removing sulfate radical in waste water

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Effect test

Embodiment 1

[0015] with CaSO 4 ·2H 2 O, Na 2 SO 4 Simulated industrial SO with a concentration of 1720mg / L prepared with other reagents 4 2- waste water. take SO 4 2- The solution volume was 200ml, the reaction temperature was 25°C, and 1.24g Al(NO) was added. 3 ) 3 ·9H 2 O, adjust the pH of the solution to 10.5 with calcium hydroxide, stir for 90min, precipitate, filter, take the filtrate for analysis, SO 4 2- The concentration is 75.6 mg / L.

Embodiment 2

[0017] with CaSO 4 ·2H 2 O, Na 2 SO 4 Simulated industrial SO with a concentration of 1290mg / L prepared with other reagents 4 2- waste water. take SO 4 2- The solution volume was 200ml, the reaction temperature was 25°C, and 0.93g Al(NO) was added. 3 ) 3 ·9H 2 O, adjust the pH of the solution to 12.0 with calcium hydroxide, stir for 60 min, precipitate, filter, take the filtrate for analysis, SO 4 2- The concentration is 80.3 mg / L.

Embodiment 3

[0019] Take 5 L of lead and zinc smelting industrial wastewater of Zhuzhou Smelter Group with a sulfate ion concentration of 1720 mg / L, the reaction temperature is 30 ° C, and 31 g of Al (NO 3 ) 3 ·9H 2 O, adjust the pH of the solution to 11.0 with calcium hydroxide, stir for 60min, precipitate, take the supernatant for analysis, SO 4 2- The concentration is 82.7mg / L.

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58
Inventor 王云燕柴立元彭小玉舒余德王海鹰彭兵闵小波杨志辉黄燕
Owner CENT SOUTH UNIV
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