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Zero-discharge method for strong brine containing high-concentration heavy metals

A technology of heavy metals and concentrated brine, applied in chemical instruments and methods, water pollutants, water softening, etc., can solve the problems of small water volume, difficult treatment, high pollution, etc.

Inactive Publication Date: 2017-09-15
JIANGSU TIANYING ENVIRONMENTAL PROTECTION ENERGY COMPLETE EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems of heavy metal-rich high-salt wastewater produced by waste incineration power plants after treatment, high pollution, small water volume, and difficult to handle, the present invention proposes a zero-discharge method for high-concentration heavy metal-rich high-salt wastewater

Method used

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  • Zero-discharge method for strong brine containing high-concentration heavy metals

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Experimental program
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Effect test

Embodiment 1

[0033] As shown in the figure, the treatment system for near-zero discharge of heavy metal-rich high-salt wastewater includes a sequential heavy metal step-by-step precipitation pretreatment system, wastewater softening system, and membrane filtration system (internal pressure, single-tube microfiltration membrane module) ) and evaporation crystallization system, heavy metal step-by-step precipitation system is used to remove heavy metal ions in high-salt wastewater step by step; wastewater softening system is used to remove calcium and magnesium ions in high-salt wastewater; membrane filtration system is used to treat high-salt wastewater after pretreatment Wastewater is filtered; the evaporation and crystallization system evaporates and crystallizes the high-salt wastewater after membrane filtration to obtain industrial salt and distilled water; during wastewater treatment, the wastewater flows through the above devices in sequence.

[0034] The heavy metal step-by-step preci...

Embodiment 2

[0042] The entire process was tested with 26 tons of treated water per day:

[0043] The high-salt wastewater rich in heavy metals in a power plant has a sodium chloride content of 6.2%, a potassium chloride content of 8.2%, a zinc content of 15.4g / L, a lead content of 5.6g / L, a copper content of 1.7g / L, and a nickel content of 0.1g / L, the cadmium content is 0.2g / L, the calcium content is 1.5g / L, and the chemical oxygen demand COD is 10mg / L.

[0044] Step-by-step precipitation of heavy metals + heavy metal scavenger treatment: After flocculation and precipitation of pH 9.0 to 10.0 in reaction sedimentation tank 1 with 10%wt sodium hydroxide solution, the effluent of reaction sedimentation tank 1 enters reaction sedimentation tank 2, and its pH The value is adjusted to 11.0-12.0 for flocculation and sedimentation. The effluent of reaction sedimentation tank 2 enters the heavy metal capture system, and TMT-18 heavy metal capture agent 2.6kg / d is added. After the heavy metal cap...

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Abstract

The invention discloses a zero-discharge method for strong brine containing high-concentration heavy metals. The zero-discharge method comprises the following steps: firstly, precipitation of heavy metals; secondly, softening; thirdly, tubular micro-filtration; fourthly, evaporation and crystallization. The zero-discharge method for the strong brine containing the high-concentration heavy metals, disclosed by the invention, is characterized in that in effluent obtained by fractional precipitation, namely evaporated and crystallized incoming water, the content of zinc is smaller than 1.0mg / L, the content of lead is smaller than 1.0mg / L, the content of cadmium is smaller than 1.0mg / L, the content of copper is smaller than 0.5mg / L, and the content of nickel is smaller than 1.0mg / L. In heavy metal sludge precipitated by the method disclosed by the invention, the contents of zinc and lead are high; the method can be used for recovering zinc oxide and lead oxide; in an evaporation and crystallization system disclosed by the invention, the salt separating rate is higher than or equal to 95 percent, the recovery rate of water is higher than or equal to 95 percent, and salts obtained by evaporating and crystalizing can be used as industrial salts for selling; distilled water is recycled for backwash of a water treatment system, medicine preparation and the like. According to the zero-discharge method disclosed by the invention, resources are recovered to the maximum extent while the difficult problems of high pollution and difficulty in discharge of high-salinity wastewater rich in the heavy metals generated by post treatment of a garbage power plant are solved, and near-zero discharge is realized.

Description

technical field [0001] The invention relates to a method for zero discharge of concentrated brine with high concentration of heavy metals, belonging to the field of wastewater treatment. Background technique [0002] The high-salt wastewater rich in heavy metals mainly comes from the post-treatment process of waste incineration power plants. Since the waste contains a variety of heavy metals and a large amount of sodium chloride and potassium chloride, the content of heavy metals and chloride salts in the wastewater generated after post-treatment is much higher than conventional High-salt wastewater (salt content > 1%), electroplating wastewater, etc. With the rapid development of the waste incineration power generation industry, the waste water generated after post-processing will inevitably become one of the main sources of pollution. [0003] Heavy metals are the main pollutants in waste water treated after incineration. They are mainly zinc, lead, and copper, with so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01G9/02C01G21/02C02F103/18C02F101/20
CPCC02F9/00C01G9/02C01G21/02C02F1/048C02F1/444C02F1/52C02F1/62C02F1/66C02F5/02C02F2101/20C02F2103/18
Inventor 吕丽娜田君国李要建李军陈竹严圣军
Owner JIANGSU TIANYING ENVIRONMENTAL PROTECTION ENERGY COMPLETE EQUIP CO LTD
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