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Treatment method for simultaneously removing fluorine and silicon compounds in wastewater

A treatment method and a technology of silicon compounds, which are applied in multi-stage water treatment, water/sewage treatment, water treatment parameter control, etc., can solve the problem of difficult simultaneous removal of fluoride ions and silicates, high concentrations of fluoride ions and silicates, Unstable effluent quality and other problems, to achieve the effect of resource utilization of fluoride, easy purchase, and dense sedimentation performance

Inactive Publication Date: 2020-01-14
北京中持净水材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the removal of silicate in wastewater, lime is often used in combination with magnesium and aluminum agents for removal in industry, but only about 60% of colloidal silicon can be removed; for the removal of dissolved silicon, not only a large dosage of chemicals is required , and there are defects such as harsh removal conditions and low removal efficiency
[0005] However, when the wastewater contains pollutants such as fluoride ions and silicates at the same time, the conventional metal oxide or hydroxide coagulation precipitation method is mainly used, but the fluoride ions and silicates in the water are not only difficult to be removed simultaneously, Moreover, the concentration of fluoride ions and silicates in the treated water body is relatively high, and the quality of the effluent water is also unstable, and there is a great environmental risk

Method used

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  • Treatment method for simultaneously removing fluorine and silicon compounds in wastewater
  • Treatment method for simultaneously removing fluorine and silicon compounds in wastewater
  • Treatment method for simultaneously removing fluorine and silicon compounds in wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0035] First-order reaction: add 500-1500 mg / L lime emulsion to raw water with a silicate ion concentration of 192 mg / L and a fluoride ion concentration of 28.3 mg / L, stir well and then add 500-1000 mg / L magnesium chloride solution and 0.2 ~0.8‰(v / v) CSD solution, the resulting flocs were left to settle and then the silicate ion concentration and fluoride ion concentration in the supernatant were measured.

[0036] Secondary reaction: Add 2.0-4.0‰ (v / v) CSD agent to the supernatant after the first-order reaction, and measure the residual silicate ion concentration and fluoride in the supernatant after the flocs are left to settle. ion concentration.

Embodiment 2

[0038] First-order reaction: add 500-1500 mg / L lime emulsion to raw water with a silicate ion concentration of 192 mg / L and a fluoride ion concentration of 28.3 mg / L, stir well and then add 500-1000 mg / L magnesium oxide solution and 0.2~0.8‰(v / v) CSD solution, the resulting flocs were left to settle and then measured the silicate ion concentration and fluoride ion concentration in the supernatant. Wherein the magnesium chloride solution is replaced by the magnesium oxide solution.

[0039] Secondary reaction: Add 2-4‰ (v / v) CSD agent to the supernatant after the first-order reaction, and then measure the residual silicate ion concentration and fluoride in the supernatant after the flocs are left to settle. ion concentration.

[0040]Residual silicate ion concentration and fluoride ion concentration and removal rate contrast result are as follows in the supernatant of embodiment 1,2:

[0041] Table 1

[0042]

[0043] In order to further effectively remove silicate ions a...

Embodiment 3

[0045] Adjust the dosage of lime, magnesium chloride, and CSD agent, and the treatment results are shown in the table below:

[0046] Table 2

[0047]

[0048] After the primary and secondary reactions, the concentration of silicate ions and fluoride ions remaining in the waste water can meet the indicators of recycling water for enterprises, and also meet the direct discharge requirements stipulated in the "Discharge Standard of Pollutants for Inorganic Chemical Industry" (GB31573-2015) .

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Abstract

The invention relates to a treatment method for simultaneously removing fluorine and silicon compounds in wastewater. The treatment steps comprise the following steps: after preparing a solution withan appropriate concentration of a medicament including an industrial lime, magnesium chloride and a high-efficiency fluorine remover, adding the mixture solution into waste water containing fluorine and silicon compounds according to a certain sequence and dosage, performing the complexation, coagulation and adsorption of fluorine ions and silicate ions by means of mechanical stirring, static precipitation and the like, thus achieving the purpose of efficient and rapid removal of fluorine ions and silicate ions in wastewater, the residual amount of fluorine ions and silicate ions in the treated water can reach the standards for discharge and industrial water reuse. According to the invention, strong alkaline regenerated waste liquid is not generated in the removal process, sludge output and comprehensive treatment cost are reduced; at the same time, it has the advantages of simple dosage and high efficiency of simultaneous removal of fluoride ions and silicate ions.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a method for synchronously removing fluoride ions and silicates in waste water. Background technique [0002] Fluorine widely exists in natural water bodies and groundwater bodies around us, and is one of the essential trace elements in the human body. Drinking water with a fluoride ion concentration of 0.5-1.0 mg / L can effectively prevent dental caries, osteoporosis, and promote calcium, phosphorus, etc. Metabolism and promotes the conduction of nerve excitement and the metabolism of enzyme systems; when drinking water with a fluoride ion concentration higher than 5-10mg / L for a long time, it will cause serious harm to the development of human teeth, bones and infant brains . However, due to the massive discharge of industrial fluorine-containing wastewater from mining and smelting, coal chemical industry, electroplating, photovoltaic, chemical fertilizer, semiconductor and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F11/121C02F101/14
CPCC02F1/56C02F1/583C02F1/60C02F11/121C02F2101/14C02F2209/06C02F2301/046C02F2301/08
Inventor 王宁宁王恒张晨钰
Owner 北京中持净水材料技术有限公司
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