Biological flocculant for processing fluorine and calcium in wastewater and preparation and application methods thereof

A biological flocculant and wastewater treatment technology, which is applied in the field of environmental engineering, can solve the problems of nitrite ion easily exceeding the standard and causing cancer, difficulty in meeting discharge standards, high operation and maintenance costs, etc., to achieve improved treatment effect, fast sedimentation speed, and wide application range wide effect

Inactive Publication Date: 2013-09-04
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Membrane separation and ion exchange methods are complex in operation, high in operation and maintenance costs, and there is a risk of secondary pollution
The operation process of the adsorption method is simple, but it is generally only suitable for treating low-concentration fluorine-containing wastewater. The chemical precipitation method generates CaF by adding calcium salts. 2 Precipitation to achieve the purpose of defluoridation The concentration of fluorine in the treated wastewater can only be reduced to 15-20mg / L, which is difficult to meet the discharge standard, and artificial addition of lime will cause the increase of calcium and alkalinity in the water, and the generated sludge Large amount, slow sludge settling, difficult dehydration and other problems
[0004] Flocculation is a widely used method in water treatment, and iron-based flocculant is the most commonly used flocculant. At present, most of them are prepared by chemical oxidation, but strong oxidants are needed, the dosage is large, the reaction conditions are harsh, and the cost is high. ; When using a catalyst, its toxicity must be considered. The nitrite ion in the product is easy to exceed the standard and cause cancer, and there are by-products, which will cause secondary pollution.

Method used

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  • Biological flocculant for processing fluorine and calcium in wastewater and preparation and application methods thereof
  • Biological flocculant for processing fluorine and calcium in wastewater and preparation and application methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Set the initial pH value to 2.0, the initial Fe 2+ Inoculate the 9K culture medium with the bacterial solution with a concentration of 9g / L, adjust the pH value to 1.5 with 30% concentrated sulfuric acid during the cultivation process, transfer when the cultured bacterial solution turns red, repeat the inoculation and culture for 3 to 5 times, and cultivate the bacterial solution T1 , inoculate the bacterial solution T1 into the 9K medium, and gradually add FeSO 4 ·7H 2 O, making Fe 2+ After the concentration reaches 45g / L, transfer the cultured bacteria solution when it turns red, and then repeat the inoculation and culture for 3 to 5 times to obtain the bacterial solution T2, inoculate the bacterial solution T2 to (NH 4 ) 2 SO 4 The concentration is 0.5g / L and no Ca(NO 3 ) 2 9K culture medium, transfer when the culture liquid turns red, repeat inoculation and culture for 3 to 5 times, and obtain Thiobacillus ferrooxidans bacterial liquid T3;

[0029] The compos...

Embodiment 2

[0034] Take 200mL F － The concentration is 20mg·L -1 Under stirring conditions, 4 mL of the biological flocculant of Example 1 was added, reacted for 30 min, allowed to settle for 30 min, and the supernatant was taken to determine the residual fluoride ion concentration to be 4.96 mg / L.

Embodiment 3

[0036] Take 200mLCa 2+ For wastewater with a concentration of 520 mg / L, 4 mL of the biological flocculant of Example 1 was added under stirring conditions, reacted for 20 min, allowed to settle for 30 min, and the supernatant was taken to determine the residual Ca ion concentration to be 5.6 mg / L.

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Abstract

The invention relates to a biological flocculant for processing fluorine and calcium in wastewater and preparation and application methods thereof. A phosphoric-acid-modified iron-based biological flocculant is obtained through reacting a liquid iron-based biological flocculant with a phosphoric acid solution. The biological flocculant is clean, is free of secondary pollution, can be used for efficiently processing wastewater containing fluorine and calcium, particularly complex multi-metal wastewater containing fluorine and calcium, and can enable the concentration of all heavy metal ions and fluorine and calcium ions to meet the lead and zinc industrial pollutant emission standards (GB25466-2010).

Description

technical field [0001] The invention relates to a biological flocculant for treating fluorine and calcium in waste water and its preparation and application method, which is suitable for the treatment of fluorine-containing and calcium-containing waste water produced in technological processes such as fluorine-containing ore mining, non-ferrous metal smelting, aluminum processing, etc., and belongs to the environment engineering field. Background technique [0002] Fluorine-containing ore mining, non-ferrous metal smelting, chemical industry, glass, electroplating and other industries often contain high concentrations of fluoride ions in wastewater. High-concentration fluoride ions will aggravate the corrosion of production pipeline equipment, endanger production safety, and make it difficult to directly reuse purified water. Moreover, the discharge of high-concentration fluoride-containing wastewater will pollute the environment and seriously threaten the safety of drinking...

Claims

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Application Information

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IPC IPC(8): C02F1/52C12N1/36C12N1/20C12R1/01C02F101/14
Inventor 闵小波杨卫春柴立元杨志辉苗雨王辉
Owner CENT SOUTH UNIV
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