Method for cooperatively treating potassium ferricyanide-containing wastewater by utilizing ferric trichloride etching waste liquid

A ferric chloride etching and co-processing technology, applied in ceramic wastewater treatment, chemical instruments and methods, filtration treatment, etc., can solve the problem of high cost of ferric chloride etching waste liquid, high cost of potassium ferricyanide wastewater, High requirements for operation and operation, to achieve the effects of good environmental and social benefits, convenient management, and low operating costs

Pending Publication Date: 2020-04-03
惠州TCL环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It mainly solves the following problems currently existing: (1) The cost of treating ferric chloride etching waste liquid by conventional methods is high; (2) The cost of treating waste water containing potassium ferricyanide is high by conventional methods; high processing cost

Method used

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  • Method for cooperatively treating potassium ferricyanide-containing wastewater by utilizing ferric trichloride etching waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take 11.4t of ferricyanide-containing potassium ferricyanide wastewater from a glass product manufacturing enterprise. After analyzing the ferricyanide content in the raw material solution is about 0.512% (w%); an electronics factory ferric chloride etching waste liquid Fe 2+ Content about 21.3% (w%), Cu 2+ The content is about 0.3% (w%), and it is treated by means of blending-coagulation sedimentation-solid-liquid separation-evaporation desalination-biochemical combination process.

[0021] After coagulation and precipitation treatment, the addition ratio (w / w) of ferric chloride etching waste liquid and potassium ferricyanide wastewater is controlled at 3:8 for pH adjustment and coagulation treatment. Acid radical content is about 3.48mg / L, Cu 2+ The content is about 2.16mg / L, and the removal rate of ferricyanate is about 99.9%. Ferricyanate ions and Cu in distilled water after three-effect evaporative desalination 2+ None were detected.

Embodiment 2

[0023] Take 7.43 tons of potassium ferricyanide wastewater from a factory, and analyze the content of ferricyanide in the raw material solution to be about 0.306% (w%); adopt the average value adjustment-coagulation precipitation-solid-liquid separation-evaporation desalination-biochemical combination process.

[0024] After coagulation and precipitation treatment, the addition ratio (w / w) of ferric chloride etching waste liquid and potassium ferricyanide wastewater is controlled at 5:8 for pH adjustment and coagulation treatment. Acid radical content about 0.15mg / L, Cu 2+ The content is about 15.3mg / L, and the removal rate of ferricyanate is about 99.9%. Ferricyanate ions and Cu in distilled water after three-effect evaporative desalination 2+ None were detected.

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Abstract

The invention relates to a method for cooperatively treating potassium ferricyanide-containing wastewater by utilizing ferric trichloride etching waste liquid. The method comprises the following steps: (1) mean value blending and coagulating sedimentation: carrying out pH adjustment, coagulation flocculation and sedimentation on potassium ferricyanide-containing wastewater by utilizing a large amount of H < + >, Cu < 2 + > and Fe < 2 + > contained in ferric trichloride etching waste liquid; (2) solid-liquid separation: carrying out solid-liquid separation on ferrous ferricyanide and copper ferricyanide precipitates formed by ferricyanide ions in the potassium ferricyanide-containing wastewater by adopting a filter press, sending an obtained filter cake to a metal sludge treatment section,collecting an obtained filtrate, and sending the filtrate to an evaporation desalting device; (3) evaporating and desalting: evaporating, concentrating, crystallizing and desalting an obtained filtered clear liquid by using a triple-effect evaporator; and (4) biochemical treatment: mixing condensed distilled water after distillation treatment of the triple-effect evaporator with domestic sewage toenter a UCT-MBR combined process biochemical treatment system. According to the method, non-toxic and harmless treatment of the ferric trichloride etching waste liquid and the potassium ferricyanidewastewater is realized, and environmental pollution is avoided.

Description

technical field [0001] The invention belongs to the technical field of harmless treatment and resource utilization of hazardous waste, and in particular relates to a method for co-processing waste water containing potassium ferricyanide by utilizing ferric chloride etching waste liquid. Background technique [0002] When glass processing enterprises make products, such as glass lenses, glass watch cases, mobile phone glass screens, etc., the glass products need a cleaning process after silk screen printing. The detergent usually uses a mixed solution of potassium ferricyanide, which causes the production process of the enterprise A certain amount of waste water containing potassium ferricyanide is produced. Such wastewater pollutants are mainly COD Cr , potassium ferricyanide and SS, the wastewater is alkaline and has poor biodegradability. Although this type of production wastewater has few water pollutants and a small amount of water, the concentration of pollutants is h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/20
CPCC02F9/00C02F1/66C02F1/5236C02F1/5245C02F1/04C02F1/001C02F3/00C02F3/30C02F2101/20C02F2101/203C02F2103/12
Inventor 曾辉李红玲黄显延蒋思宏
Owner 惠州TCL环境科技有限公司
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