Treatment method for high-stability complexing heavy metal waste water

A technology with strong stability and treatment method, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. , high efficiency and low processing cost

Inactive Publication Date: 2012-02-15
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advanced Fenton method has mild reaction conditions, high treatment efficiency, and a wide range of applications. It has been used to degrade various organic wastewater, such

Method used

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  • Treatment method for high-stability complexing heavy metal waste water
  • Treatment method for high-stability complexing heavy metal waste water
  • Treatment method for high-stability complexing heavy metal waste water

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1: Ni-EDTA complex wastewater

[0031] Take 100 ml at room temperature containing 50.00 mg / L Ni 2+ Ni-EDTA wastewater, adjust the pH to 2.5, add 0.2 g zero-valent iron and 0.8 ml 4.4 mol / L H 2 O 2 , Stir the reaction for 60 minutes. Add sodium hydroxide precipitant to the reaction solution until the pH is 11.5, flocculate and stir for 10 minutes, set it aside, take the supernatant and measure the remaining nickel ion concentration of 0.85 mg / L. The COD value of the solution is from the initial 252 It is reduced to 53 mg / L, and the total iron ion concentration remaining in the solution is 0.01 mg / L.

Example Embodiment

[0032] Example 2: Cu-EDTA complexing heavy metal wastewater

[0033] Take 100 ml at room temperature containing 50.00 mg / LCu 2+ Of Cu-EDTA wastewater, adjust the pH to 2.6, add 0.2 g zero-valent iron and 0.6 ml 4.4 mol / L H 2 O 2 , Stir the reaction for 60 minutes. Add sodium hydroxide precipitant to the reacted solution to pH 10, flocculate and stir for 10 minutes, clean it, take the supernatant and measure the remaining copper ion concentration of 0.25 mg / L, and the remaining total iron ion concentration in the solution Not detected.

Example Embodiment

[0034] Example 3: Cr-EDTA complex wastewater

[0035] Take 100 ml at room temperature containing 50.00 mg / LCu 2+ Cu-EDTA wastewater, adjust the pH to 2.4, add 0.4 g zero-valent iron and 0.8 ml 4.4 mol / L H 2 O 2 , Stir the reaction for 60 minutes. Add sodium hydroxide precipitant to the reaction solution to pH 9.5, flocculate and stir for 10 minutes, clean it, take the supernatant to measure the remaining chromium ion concentration of 1.3 mg / L, and the remaining total iron ion concentration in the solution 0.03 mg / L.

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Abstract

The invention discloses a treatment method for high-stability complexing heavy metal waste water, which comprises two steps that: firstly, zerovalent iron and hydrogen peroxide are added into the waste water so that the complexing heavy metal is decomposed into free heavy metal, organic complexing agents are degraded into small molecular substances, then, hydroxide precipitation agents are added into the waste water, and heavy metal ions are formed into precipitates and are removed. The method can be used for treating the high-stability complexing heavy metal waste water, the heavy metal can be discharged in a way of reaching the standard, simultaneously, the chemical oxygen demand (COD) index can be effectively reduced, the treatment cost is low, the secondary pollution can not be caused, and the economic benefits can be improved.

Description

technical field [0001] The invention relates to a treatment method for complex heavy metal wastewater with strong stability. Background technique [0002] With the accelerated development of industrialization, the rapid development of modern industries such as IT, electroplating, electronics, metallurgy, mining, and chemical industry has produced a large amount of heavy metal wastewater. Heavy metal pollutants are non-degradable and long-term, and especially have direct harm to human health. Statistics show that my country produces about 40 billion tons of industrial wastewater every year, of which heavy metal wastewater accounts for about 60%. The discharge of these wastewater into rivers and lakes not only seriously pollutes surface water and groundwater, causes a sharp decline in the total amount of global available water resources, but also increases the content of heavy metals in the soil, which ultimately endangers human health. [0003] How to effectively control he...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 付丰连谢丽萍
Owner GUANGDONG UNIV OF TECH
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