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Industrial treatment method of high-concentration arsenic-containing wastewater

An industrial treatment, high-concentration technology, applied in gaseous discharge wastewater treatment, water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problems of incomplete purification of wastewater, difficult to achieve, secondary pollution, etc., and achieve low cost. , good purification effect, small amount of sludge

Active Publication Date: 2016-04-20
CHONGQING YUANDA WATER SERVICE
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Problems solved by technology

[0008] In order to solve the existing industrial methods of treating high-concentration arsenic-containing wastewater, the amount of sludge produced is large, which is easy to cause secondary pollution; the wastewater is not purified thoroughly, and it is difficult to meet the total arsenic discharge limit of 0.2 in the national vanadium industry pollutant discharge standard GB26452-2011 mg / L standard requirements and other issues, the present invention proposes an industrial treatment method for high-concentration arsenic-containing wastewater

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  • Industrial treatment method of high-concentration arsenic-containing wastewater
  • Industrial treatment method of high-concentration arsenic-containing wastewater

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specific Embodiment 1

[0038] An industrial treatment method for high-concentration arsenic-containing wastewater, comprising the following steps:

[0039] S1. Advanced oxidation: the arsenic-containing wastewater is oxidized in an ozone aeration device, and the trivalent arsenic in the arsenic-containing wastewater is oxidized to pentavalent arsenic;

[0040] S2. Primary flocculation and sedimentation: the oxidized arsenic-containing wastewater enters the flocculation sedimentation tank, and iron sulfate is added according to the molar ratio of iron to arsenic of 1:1, and reacts for 5 minutes; according to the molar ratio of calcium and arsenic of 3:1, calcium hydroxide is added to react 50min;

[0041] S3, primary sedimentation separation: separate the calcium arsenic slag from the liquid once;

[0042] S4. Secondary flocculation and precipitation: the liquid separated from calcium and arsenic slag is subjected to secondary flocculation and precipitation, and the calcium and arsenic friction

[00...

specific Embodiment 2

[0048] An industrial treatment method for high-concentration arsenic-containing wastewater, comprising the following steps:

[0049] S1. Advanced oxidation: the arsenic-containing wastewater is oxidized in an ozone aeration device, and the trivalent arsenic in the arsenic-containing wastewater is oxidized to pentavalent arsenic;

[0050] S2. First-level flocculation and precipitation: the oxidized arsenic-containing wastewater enters the flocculation sedimentation tank, and iron sulfate is added according to the molar ratio of iron to arsenic of 3:1, and reacts for 30 minutes; 30min;

[0051] S3, primary sedimentation separation: separate the calcium arsenic slag from the liquid once;

[0052] S4. Secondary flocculation precipitation: the liquid separated from the calcium-arsenic slag is subjected to secondary flocculation precipitation, and calcium hydroxide is added according to the calcium-arsenic molar ratio of 2.5:1, and reacted for 30 minutes;

[0053] S5, secondary se...

specific Embodiment 3

[0057] An industrial treatment method for high-concentration arsenic-containing wastewater, comprising the following steps:

[0058] S1. Advanced oxidation: the arsenic-containing wastewater is oxidized in an ozone aeration device, and the trivalent arsenic in the arsenic-containing wastewater is oxidized to pentavalent arsenic;

[0059] S2. First-level flocculation and precipitation: the oxidized arsenic-containing wastewater enters the flocculation sedimentation tank, and iron sulfate is added according to the molar ratio of iron and arsenic of 2:1, and reacted for 15 minutes; and calcium hydroxide is added according to the molar ratio of calcium and arsenic of 2:1, Reaction 20min;

[0060] S3, primary sedimentation separation: separate the calcium arsenic slag from the liquid once;

[0061] S4. Secondary flocculation precipitation: the liquid separated from the calcium-arsenic slag is subjected to secondary flocculation precipitation, and calcium hydroxide is added accordi...

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Abstract

The invention provides an industrial treatment method of high-concentration arsenic-containing wastewater. The industrial treatment method comprises the following steps: putting the arsenic-containing wastewater into an oxidization device; oxidizing trivalent arsenic into pentavalent arsenic by adopting high-grade oxidization; adopting two grades of flocculation and sedimentation and two grades of settlement and separation: adopting ultrafiltration membrane treatment, electric flocculation treatment and terminal flocculation and sedimentation; detecting that treated discharged water reaches standard requirements and then discharging. The industrial treatment method of the high-concentration arsenic-containing wastewater, provided by the invention, has the beneficial technical effects that the method is simple and low in cost, the amount of produced sludge is small and secondary pollution is not caused; a purification effect is good, and the total arsenic content in the treated wastewater is smaller than or equal to 0.2mg / L and reaches standards of Discharge Standards of Pollutants for National Vanadium Industry GB26452-2011.

Description

technical field [0001] The invention relates to an industrial wastewater treatment method, in particular to an industrial treatment method for high-concentration arsenic-containing wastewater. Background technique [0002] In various industrial production processes, various industrial wastewater will be produced, which need to be treated before being discharged; otherwise, it will cause environmental pollution. For example: Selective Catalytic Reduction flue gas denitrification technology (SCR for short) is the preferred technology adopted by thermal power plants to further control NOx emissions after low-nitrogen combustion technology, because of its high denitrification rate (up to 90%). widely used. However, the denitrification catalyst commonly used in SCR technology is V 2 o 5 / TiO 2 Based catalyst, due to the trace amount of arsenic in coal combustion, the gaseous As in high temperature flue gas 2 o 3 It will cause arsenic poisoning of the denitrification catalys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F101/20C02F103/18
CPCC02F1/444C02F1/463C02F1/52C02F1/72C02F9/00C02F2101/20C02F2103/18
Inventor 胡蓉王旭东李锐张占梅
Owner CHONGQING YUANDA WATER SERVICE