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Treatment method of industrial arsenic wastewater

A treatment method and wastewater technology, which are applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of increasing the cost of wastewater treatment, and achieve low treatment costs and reduced treatment costs. Effect

Inactive Publication Date: 2015-07-22
TONGLING CHEM IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the wastewater after alkali sulfide removal of arsenic can inactivate the biochemical bacteria that treat nitrogen and phosphorus-containing wastewater, the wastewater after alkali sulfide removal of arsenic cannot directly enter the biochemical treatment system for wastewater from the fertilizer process. Only then can it enter the biochemical treatment system, which increases the cost of wastewater treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Under normal temperature conditions, weigh 500g of industrial acid wastewater containing 4ppm of arsenic, add 1.8g of lime containing about 50% of effective CaO, and stir for 30min to precipitate various impurities such as calcium sulfate and generate most of the arsenic in the form of calcium arsenate. Obtain the slurry that pH is 6.5, filter and remove various impurities such as calcium sulfate and arsenic-containing filter residue, obtain a section of treated water containing arsenic about 1.2ppm; add polyferric sulfate and H 2 o 2 , the addition of polyferric sulfate is 0.2% of the weight of wastewater containing arsenic to be treated, H 2 o 2 The added amount is 0.2% of the weight of the arsenic-containing wastewater to be treated, stirred for 30 minutes, and the pH is controlled to be 5.0. The residual arsenic is precipitated in the form of iron arsenate, and the filter residue is removed by filtration. The obtained treated water is analyzed for arsenic As=0.40pp...

Embodiment 2

[0034] Under normal temperature conditions, weigh 500g of industrial acid wastewater containing 6ppm of arsenic, add 7.8g of calcium carbide slag, stir and react for 40min, various impurities such as calcium sulfate and most of the arsenic in the form of calcium arsenate are precipitated, and a material with a pH of 7.5 is obtained. Slurry, filtered to remove various impurities such as calcium sulfate and most of the arsenic filter residue, to obtain a section of treated water containing about 1.4ppm arsenic; then add polyferric sulfate and H 2 o 2 , the addition of polyferric sulfate is 0.6% of the weight of wastewater containing arsenic to be treated, H 2 o 2 The added amount is 0.8% of the weight of the arsenic-containing wastewater to be treated, stirred for 40 minutes, and the pH is controlled to be 6.6. The residual arsenic is precipitated in the form of iron arsenate, and the filter residue is removed by filtration. The obtained treated water is analyzed for arsenic As...

Embodiment 3

[0036] Under normal temperature conditions, weigh 500g of industrial acid waste water containing 12ppm of arsenic, add 2.8g of 10% NaOH solution, stir and react for 50min, precipitate various impurities such as calcium sulfate and generate most of the arsenic in the form of calcium arsenate, and obtain a pH of 8.0 slurry. Filter to remove various impurities such as calcium sulfate and most of the arsenic filter residue to obtain a stage of treated water containing about 2.8ppm arsenic; then add polyferric sulfate and H 2 o 2 , the addition of polyferric sulfate is 0.4% of the weight of wastewater containing arsenic to be treated, H 2 o 2 The added amount is 0.4% of the weight of the arsenic-containing wastewater to be treated, stirred for 50 minutes, and the pH is controlled to be 7.0. The residual arsenic is precipitated in the form of iron arsenate, and the filter residue is removed by filtration. The obtained treated water is analyzed for arsenic As=0.35ppm.

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Abstract

The invention relates to a treatment method of industrial arsenic wastewater, which comprises the following steps: neutralizing industrial arsenic wastewater with an antalkali to control the end pH value to be greater than or equal to 5.0, and carrying out solid-liquid separation to obtain primary treated water; adding polyferric sulfate and H2O2 into the primary treated water to control the end pH value to be greater than or equal to 5.0, wherein the polyferric sulfate accounts for 0.01-1 wt% of the arsenic wastewater to be treated, and the H2O2 accounts for 0.01-1 wt% of the arsenic wastewater to be treated; and carrying out solid-liquid separation on the product to obtain secondary treated water with the arsenium content of less than 0.5 ppm. The primary treatment adopts lime or any other antalkali, and thus, has the advantages of accessible raw material and low treatment cost. The secondary treatment adopts the H2O2 and polyferric sulfate as reagents, and can convert residual arsenium in the primary treated water into an insoluble ferric arsenate precipitate, thereby achieving the effect of deep dearsenication. The secondary treated water can be further treated by a sewage treatment cyclic utilization system, thereby reducing the subsequent treatment cost for arsenic wastewater.

Description

technical field [0001] The invention relates to a treatment method for industrial arsenic-containing wastewater, in particular to a treatment method for arsenic-containing wastewater discharged during the production process of industrial sulfuric acid. Background technique [0002] The current relatively mature and commonly used arsenic removal methods are coagulation method and adsorption method. The treatment of arsenic-containing wastewater in smelting and sulfuric acid industries mainly adopts the soda sulfide method. The principle is to achieve the purpose of arsenic removal through the reaction of soda sulfide and As in wastewater to form extremely insoluble arsenic sulfide, which is precipitated and separated. [0003] Many enterprises in the chemical fertilizer industry adopt the combination mode of mineral fertilizer production, that is, first use pyrite to produce sulfuric acid, and then use sulfuric acid and phosphate rock to react to produce ammonium phosphate an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 杨文斌
Owner TONGLING CHEM IND GRP
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