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Heavy metal wastewater treatment method

A treatment method and heavy metal technology, applied in water/sewage treatment, special compound water treatment, adsorption water/sewage treatment, etc., can solve problems such as unstable treatment effect, secondary pollution, and difficulty in ensuring stable and up-to-standard discharge of clean water. Achieve the effect of recyclable useful resources, thorough treatment and simple operation

Active Publication Date: 2016-08-24
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although these traditional treatment processes can remove heavy metals in wastewater, the treatment effect is not stable, and the quality of recovered clean water after treatment is still difficult to ensure stable and up-to-standard discharge, and it will also cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Contains heavy metal Mn 2+ mancozeb wastewater, Mn 2+ The content is 300mg / L, the salt content is 102044mg / L, and the COD=2500mg / L.

[0028] (1) Flocculation: adjust the pH value of the wastewater to 8-9, add 0.1% polyacrylamide (based on the quality of wastewater), the concentration of polyacrylamide is 0.3%, stir slowly for 15 minutes and then filter to obtain the filtrate.

[0029] (2) Adsorption: in the filtrate that step (1) obtains, add 0.3% gac (taking waste water quality as benchmark), filter after stirring and adsorbing 1h, record Mn 2+ The removal rate was 92.4%.

[0030] (3) Oxidation: add 0.1% hydrogen peroxide (based on waste water quality) in the filtrate, to remove ethylene thiourea (ETU) in the waste water, wherein the concentration of hydrogen peroxide is 30%, obtain treatment liquid 1, record treatment liquid 1 pH=10, COD=1324mg / L. In a weakly alkaline reaction system, the main oxidation product of ETU is ethylene urea (EU).

[0031] (4) Adsorptio...

Embodiment 2

[0035] Heavy metal Pb produced in the production process of lead-acid batteries 2+ The waste water, acid content is 18.6%, sodium sulfate content is 8%, COD=18740mg / L.

[0036] (1) Flocculation: adjust the pH value of the wastewater to 8-9, add 0.1% polyacrylamide (based on the quality of wastewater), the concentration of polyacrylamide is 0.3%, stir slowly for 15 minutes and then filter to obtain the filtrate.

[0037] (2) Adsorption: add 0.3% gac (taking waste water quality as benchmark) in the filtrate that step (1) obtains, suction filtration after stirring and adsorbing 1h, record Pb 2+ The removal rate was 90.1%.

[0038] (3) Oxidation: add 0.5% hydrogen peroxide (based on waste water quality) in filtrate, to remove the organic matter in waste water, wherein the concentration of hydrogen peroxide is 30%, obtains treatment liquid 1, records the pH=10 of treatment liquid 1 , COD=10253mg / L.

[0039] (4) Adsorption: Add 0.05% silane-modified graphene oxide (based on the q...

Embodiment 3

[0049] The ethylenediaminetetraacetic acid-modified graphene oxide (EDTA-GO) in the step (4) of Example 1 was eluted and regenerated for the adsorption of heavy metal ions again, this time Mn 2+ The removal rate is 98.2%.

[0050] Elution method: filter the adsorbed material with a 0.45 μm microporous filter, wash with deionized water to remove unadsorbed metal ions, then add it to 0.1mol / L hydrochloric acid, shake it on a shaker for 1 hour, and use Filter through a 0.45 μm microporous filter, wash with 0.1 mol / L hydrochloric acid, and then wash with deionized water.

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Abstract

The invention discloses a heavy metal wastewater treatment method. The method includes the steps that part of organic matter in wastewater is removed by means of the oxidation function of oxidant to obtain a treatment solution 1, then heavy metal in the treatment solution 1 is removed by means of the strong adsorption function of an absorbent to heavy metal ions in water to obtain a treatment solution 2, residual organic matter in the treatment solution 2 is degraded through photocatalytic reaction, free radicals extremely high in activity are generated by photocatalytic reaction, the free radicals have an excellent organic matter removal effect, and outflow water obtained after photocatalytic treatment can be reused. The treatment method is thorough in treatment, free of secondary pollution, capable of recycling useful resources and capable of achieving industrialization easily.

Description

technical field [0001] The invention relates to the field of waste water recycling and utilization, in particular to a treatment method for heavy metal waste water. Background technique [0002] Heavy metal wastewater refers to wastewater containing heavy metals discharged from industrial production processes such as mining and metallurgy, machinery manufacturing, chemical industry, electronics, and instrumentation. Heavy metal pollution of water bodies has become one of the most serious environments in the world today. [0003] At present, the commonly used technologies for heavy metal wastewater treatment are: [0004] ① Chemical method: chemical precipitation method, redox method, solvent extraction and separation. [0005] ②Physical and chemical methods: ion exchange method, adsorption method, membrane separation technology; [0006] ③ Biological method: phytoremediation, bioflocculation, biosorption. [0007] Although these traditional treatment processes can remove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F9/12C02F101/30C02F101/20C02F101/22
CPCC02F1/28C02F1/281C02F1/283C02F1/30C02F1/488C02F1/5245C02F1/5263C02F1/56C02F1/72C02F1/722C02F1/725C02F1/76C02F1/766C02F1/78C02F9/00C02F2101/20C02F2101/206C02F2101/22C02F2101/30C02F2305/023C02F2305/026C02F2305/10
Inventor 安俊芳陈磊吴勇前张静孔令鸟
Owner ZHEJIANG QICAI ECO TECH CO LTD
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