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Low-cost comprehensive galvanizing wastewater treatment method

A technology that integrates wastewater and treatment methods. It is applied in metallurgical wastewater treatment, multi-stage water treatment, water/sewage treatment, etc. It can solve the problems of high cost of chemicals and complex resource utilization, achieve good decolorization effect and improve oxidation reaction efficiency. , the effect of low dosage

Pending Publication Date: 2021-12-03
广安德槿环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low pH of spent acid, Zn 2+ , Fe 2+ and Fe 3+ The content is high, and the alkali-adding precipitation method needs to consume a large amount of alkali, and the cost of the agent is too high; the negative pressure evaporation process needs to raise the water temperature to 70-80°C, and the operating electricity cost is about 500 yuan / m 3 ; and galvanized wastewater contains lead, manganese, zinc and other impurities, resource utilization is also extremely complicated

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  • Low-cost comprehensive galvanizing wastewater treatment method
  • Low-cost comprehensive galvanizing wastewater treatment method
  • Low-cost comprehensive galvanizing wastewater treatment method

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Embodiment 1

[0026] Example 1, such as figure 1 As shown, the low-cost galvanized comprehensive wastewater treatment system of the present invention is composed of limestone filter 1, iron-carbon inner electrolytic cell 2, coagulation sedimentation tank 3, oxidation reaction tank 4, pH adjustment tank 5, sedimentation tank 6 and sludge tank 7 composition.

[0027] The particle size of the limestone in the limestone filter 1 is 2-4mm. The outlet pipe of the limestone filter 1 is connected to the water inlet pipe of the iron-carbon inner electrolytic cell 2, and the iron-carbon inner electrolytic cell 2 is also provided with a cleaning liquid inlet pipe, and the outlet pipe of the iron-carbon inner electrolytic cell 2 is connected to the coagulation sedimentation tank 3 The water inlet pipe of the coagulation sedimentation tank 3 is connected with the water inlet pipe of the oxidation reaction tank 4. The water inlet pipe of the oxidation reaction tank 4 is also provided with a cooling wate...

Embodiment 2

[0029] Waste acid influent water quality:

[0030]

[0031] Cleaning wastewater influent water quality:

[0032]

[0033] Amount of waste acid 4m 3 / d, cleaning waste water is 10m 3 / d, cooling water is 20m 3 / d

[0034] The processing steps are as follows:

[0035] (1) Use a limestone filter to remove fine suspended matter, and at the same time, limestone reacts with acid to increase the pH value of wastewater to 2-3.

[0036] (2) The wastewater filtered by the limestone filter enters the iron-carbon inner electrolytic cell together with the plating piece cleaning wastewater, and iron flowers (also can be debris, which can be discarded in the factory processing process) are added in the iron-carbon inner electrolytic cell. The iron-carbon filler composed of iron flower) and granular activated carbon can increase the pH value of the wastewater from the iron-carbon internal electrolytic cell to 5-6.

[0037] (3) The wastewater from the iron-carbon internal electroly...

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Abstract

The invention discloses a low-cost comprehensive galvanizing wastewater treatment method. The method comprises the following steps: (1) removing fine suspended matters by using a limestone filter, and meanwhile, subjecting limestone to reacting with acid to increase the pH value of wastewater to 2-3; (2) allowing the wastewater to enter an iron-carbon internal electrolytic tank, and increasing the pH value of the wastewater to 5-6; (3) adding PAC and PAM into a coagulative precipitation tank, and discharging sediments at the bottom of the coagulative precipitation tank; (4) feeding the wastewater into an oxidation reaction tank, and oxidizing Fe<2+> into Fe<3+>; (5) feeding water discharged from the oxidation reaction tank into a pH value adjusting tank, and adding caustic soda flakes into the pH value adjusting tank to adjust the pH value to 7.2-7.8 so as to promote generation of Zn(OH)3 and Fe(OH)3; and (6) allowing water discharged from the pH value adjusting tank to enter a sedimentation tank, discharging sediments at the bottom of the sedimentation tank into a sludge tank, and discharging supernatant after the supernatant reaches the standard. The method is small in dosage, low in operation cost, capable of stably reaching the standard of effluent and suitable for wastewater treatment of electroplating enterprises.

Description

technical field [0001] The invention relates to a low-cost galvanizing comprehensive wastewater treatment method, which belongs to the technical field of sewage treatment. Background technique [0002] my country is a big manufacturing country, and a large amount of galvanizing wastewater will be produced in the process of galvanizing and anticorrosion. Galvanizing waste water includes waste acid, plating parts cleaning waste water and plating parts cooling water, among which waste acid contains acid, Zn 2+ , Fe 2+ , Fe 3+ etc. The waste acid is characterized by strong acidity (pH value 0.5-1.0), high COD concentration (about 10000mg / L), and high chroma. The pH value of the cleaning wastewater is 1.8-3.0, and the COD concentration is about 260-430mg / L. The pH of the cooling water of the plated parts is 6.5, and the COD is small and negligible. At present, the common treatment methods of galvanizing waste acid are alkali precipitation and negative pressure evaporation. ...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F103/16
CPCC02F9/00C02F1/001C02F1/66C02F1/46176C02F1/5281C02F1/5245C02F1/56C02F1/725C02F1/76C02F2001/007C02F2103/16C02F2209/06C02F2209/08C02F2209/02C02F2301/08
Inventor 刘启东龙辉
Owner 广安德槿环保科技有限公司
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