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Method and device for deeply treating heavy metal wastewater

A technology for advanced treatment and heavy metals, applied in water/sewage treatment, flotation water/sewage treatment, neutralization water/sewage treatment, etc. Wide application range, high separation efficiency and simple process

Active Publication Date: 2014-01-29
GO HIGHER ENVIRONMENT GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide an efficient and reliable advanced treatment method for heavy metal wastewater in view of the defects of complex process, small membrane operating flux, serious pollution, frequent cleaning, and high energy consumption in the existing membrane heavy metal wastewater treatment technology With the device, the heavy metal wastewater is directly treated on the spot

Method used

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  • Method and device for deeply treating heavy metal wastewater

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Embodiment 1

[0033] Example 1: Wastewater from an electroplating factory is treated with the method and device of the present invention, the treatment capacity is 10t / d, the surfactant is sodium lauryl sulfate and nonylphenol polyoxyethylene ether, ultrafiltration The average flux of membrane produced water has been maintained at 210L / m 2 .h; the reversing period of electrocoagulation is 20ms, and the removal rate of heavy metals is over 98%. The specific influent water quality and effluent water quality are shown in Table 1.

[0034] Table 1 Water quality before and after treatment of heavy metal waste liquid

[0035] project Raw water (mg / L) Water after treatment (mg / L) Cr 6+ 50-90 <0.2

Embodiment 2

[0036] Example 2: The heavy metal waste liquid of a certain chemical plant is treated by using the method and device of the present invention. The specific influent water quality and effluent water quality are shown in Table 2. The treatment capacity is 20t / d, the device has been in stable operation for 3 months, and the average flux of membrane produced water has been maintained at 150L / m 2 .h, the heavy metal removal rate remained above 98%.

[0037] Table 2 Influent and effluent water quality of heavy metal waste liquid

[0038] Test items Raw water (mg / L) Water after treatment (mg / L) pH 1.6-2.4 6-9 SS 2100-2700 <10

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Abstract

The invention provides a method and device for deeply treating heavy metal wastewater. Heavy metal wastewater flows into a chemical reaction tank after being adjusted by medicating in an adjusting tank; a surfactant is added into the chemical reaction tank; particle size of heavy metals and micromolecule pollutants is increased through combined action of anionic and nonionic surfactants; after ultrafiltration separation, permeated liquor is exhausted or recycled by reaching standards through air flotation; concentrated liquor is electrically flocculated by adopting high-voltage pulses, and effluent reaches emission standards or is recycled for a production process. The heavy metal wastewater treated by the method disclosed by the invention has stable effluent water quality; meanwhile, power consumption is low and is only 1 / 5-1 / 20 that of a common electrolytic process.

Description

technical field [0001] The invention relates to a treatment method and device for heavy metal wastewater, in particular to a method and device for advanced treatment of heavy metal wastewater, belonging to wastewater treatment technology and integrated equipment. Background technique [0002] Heavy metal wastewater mainly comes from non-ferrous metal mining and dressing industry, chemical raw material and chemical product manufacturing industry, and non-ferrous metal smelting and rolling processing industry. The discharge of heavy metals in these three industries accounts for nearly 80% of the total discharge, and its wastewater discharge accounts for the total. 16% of emissions. Traditionally, the methods for treating industrial wastewater with heavy metal ions mainly include the following: chemical precipitation, ion exchange, and physical adsorption. Or in a more manageable form, the final disposal of these substances is usually landfill. [0003] Membrane separation te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F1/66C02F1/24C02F1/44C02F1/463C02F101/20
Inventor 陈福泰杨艳褚永前
Owner GO HIGHER ENVIRONMENT GRP CO LTD
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