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Method for processing heavy-metal complexed wastewater through Fenton reinforced iron-chip internal electrolysis process

An internal electrolysis and heavy metal technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., to reduce organic load and treatment difficulty, reduce consumption, and save resources

Inactive Publication Date: 2011-05-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a new method for efficiently treating heavy metal complex wastewater rich in complexing agents such as EDTA for the defects of the existing complex wastewater treatment process

Method used

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  • Method for processing heavy-metal complexed wastewater through Fenton reinforced iron-chip internal electrolysis process
  • Method for processing heavy-metal complexed wastewater through Fenton reinforced iron-chip internal electrolysis process
  • Method for processing heavy-metal complexed wastewater through Fenton reinforced iron-chip internal electrolysis process

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Example 1: Treatment of EDTA-complexed copper wastewater by electrolytic fluidized bed in iron filings combined with Fenton oxidation

[0018] Soak cast iron chips with a particle size of 0.7mm in detergent and degrease them at 80°C for 20 minutes, then soak them in 1% hydrochloric acid for 0.5 minutes to remove surface oxides, rinse them with clean water, and dry them for later use. Then mix 20g of cast iron shavings after the above-mentioned activation pretreatment and 20g of activated carbon particles with a particle size of 1.2mm and add them into the fluidized bed reactor, then adjust the pH of the wastewater to 1.5 and then pass it into the fluidized bed. Dosing 0.06mol / LNa 2 SO 4 The solution is used as the electrolyte, the mechanical stirring speed is 80r / min, the flow rate of the waste water is controlled so that the residence time of the hydraulic power in the inner electrolysis reactor is 20min; then the inner electrolysis water is passed into the Fenton rea...

Embodiment 2

[0023] Example 2: Treatment of EDTA-complexed copper wastewater by internal electrolysis fixed bed combined with Fenton oxidation method

[0024] Soak the wire-like iron shavings in sodium hydroxide with a mass concentration of 9% and degrease at 100°C for 0.5h, then soak in hydrochloric acid with a volume fraction of 2% for 0.5h to remove surface oxides, rinse with clean water and dry spare. 80 g of filiform iron shavings and 20 g of activated carbon with a particle size of 4.5 mm are packed into the electrolytic fixed bed in iron filings after the above-mentioned activation pretreatment. Adjust the pH of the wastewater to 3.5 and pass it into the fixed-bed reactor, adopt the pulse water inlet method and intermittent aeration method, control the flow rate of the inlet water to maintain the hydraulic retention time of the wastewater at 60min, and pass the fixed-bed effluent into the Fenton reactor to measure The concentration of ferrous ions in the water is 330mg / L, then add ...

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Abstract

The invention discloses a method for processing heavy-metal complexed wastewater through a Fenton reinforced iron-chip internal electrolysis process. The method comprises the following steps of: filling an internal electrolysis filler into an iron-chip internal electrolysis reactor, then introducing the wastewater into the reactor after regulating the pH value of the wastewater to 1.5-3.5, adding a Na2SO4 solution, controlling dissolved oxygen to be not higher than 3.0mg / L, and controlling the flow speed of the introduced wastewater; then introducing the discharged water of the internal electrolysis reactor into a Fenton reactor, maintaining the ferrous concentration in the water to be 300-750mg / L, adding H2O2 according to the mass concentration ratio of H2O2 to Fe2+ of 2.0-7.0, and sufficiently reacting for 60-120 minutes under the condition of controlling the pH value to be 2.5-5.5; and regulating the pH value of the discharged water to 9.0-10.0, standing and settling, and separating mud from the water. According to the method disclosed by the invention, the operation is simple and convenient, the sewage biodegradability can be markedly improved, the difficulty and the organic load of subsequent processing are greatly reduced, and the cost is saved.

Description

technical field [0001] The invention relates to an advanced oxidation treatment process for toxic, harmful and difficult-to-biodegrade industrial waste water, in particular to a method for treating heavy metal complex waste water by a Fenton-enhanced iron chip internal electrolysis process, which is suitable for treating printed circuit boards (PCBs), Heavy metal complex wastewater rich in organic complexing agents such as EDTA in electroplating, pigment, metal processing and other industries. Background technique [0002] Heavy metal complex wastewater mainly comes from electroplating, printed circuit boards, pigments, metal processing and other production industries. Common complexing agents include EDTA, ethylenediamine, tartaric acid, citric acid, etc. They coordinate with heavy metal ions such as copper and nickel to form very stable soluble complexes and become the main pollutants of complexed wastewater. The removal of complexed heavy metal ions is difficult, and it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/62
Inventor 胡勇有鞠峰
Owner SOUTH CHINA UNIV OF TECH
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