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Double-oxidation device and method for advanced treatment of electroplating wastewater

A technology for electroplating wastewater and advanced treatment, applied in metallurgical wastewater treatment, multi-stage water treatment, water/sewage treatment and other directions, can solve the problem of low COD removal efficiency, avoid strong acid corrosion, efficient degradation, high electrocatalytic performance Effect

Active Publication Date: 2020-07-31
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem of low COD removal efficiency in electroplating wastewater caused by the difficult degradation of iron complexes produced in the existing electrocatalytic Fenton oxidation process, the present invention provides a double oxidation device and method for advanced treatment of electroplating wastewater. The narrow channel electrochemical oxidation unit is connected in series after the electrocatalytic Fenton oxidation unit to break the iron complex and improve the COD removal efficiency

Method used

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  • Double-oxidation device and method for advanced treatment of electroplating wastewater
  • Double-oxidation device and method for advanced treatment of electroplating wastewater
  • Double-oxidation device and method for advanced treatment of electroplating wastewater

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Effect test

Embodiment 1

[0055] Electro-Fenton / electrochemical double oxidation coupling process was used to treat galvanizing wastewater in an electroplating enterprise.

[0056] The influent COD of galvanized wastewater is 1444mg / L. Zinc ion concentration is 8.1g / L; chloride ion concentration is 46g / L, pH=2.

[0057] Step 1. The water sample is pretreated by the chemical precipitation method. will be 2.5m 3 The galvanizing wastewater is poured into the middle pool 4, the pH value is adjusted to 8.0-9.0 with caustic soda, and allowed to settle for 1 hour. After being filtered by the plate and frame filter press 5, the water sample is injected into the double oxidation reaction tank 3, and the pH is adjusted to 3.0-4.0.

[0058] Step 2, electrocatalytic Fenton oxidation process: the galvanized production wastewater circulates in the double oxidation reaction tank 3 and the electrochemical oxidation unit 2 (the power supply of the electrochemical oxidation unit 2 is not turned on during the electroc...

Embodiment 2

[0079] The electro-Fenton / electrochemical double oxidation coupling process was used to treat the chromium plating production wastewater of an electroplating enterprise.

[0080] Influent COD of wastewater from chrome plating production is 2127mg / L. Chromium ion concentration is 7.7g / L; chloride ion concentration is 37g / L, pH=1.5.

[0081] Step 1. The water sample is pretreated by a redox method. will be 2.5m 3 The chrome-plating waste water is poured into the middle pool 4, and the water sample is yellow at this time, and sodium sulfite is added in the middle pool 4 until the water sample turns dark green and stops adding. Due to Cr in chrome plating wastewater 6+ It has strong oxidizing properties, which will greatly interfere with the electrocatalytic Fenton oxidation reaction, and will also corrode the tubular membrane electrode of the electrochemical oxidation unit 2, so it is necessary to remove the Cr 6+ reduced to Cr 3+ .

[0082] Step 2, using the chemical preci...

Embodiment 3

[0095] The electro-Fenton / electrochemical double oxidation coupling process was used to treat the tin-plating wastewater of an electroplating enterprise.

[0096] Influent COD of tinning production wastewater = 1643mg / L. The tin ion concentration is 9.6g / L; the chloride ion concentration is 39g / L, pH=1.7.

[0097] Step 1. The water sample is pretreated by the chemical precipitation method. will be 2.5m 3 The tin-plating waste water is poured into the intermediate pool 4, and the pH value is adjusted to 8.0-9.0 with caustic soda, and left to settle for 1 hour. After being filtered by the plate and frame filter press 5, the water sample is injected into the double oxidation reaction tank 3, and the pH is adjusted to 3.0-4.0.

[0098] Step 2, electrocatalytic Fenton oxidation process: the tin-plating production wastewater circulates in the double oxidation reaction tank 3 and the electrochemical oxidation unit 2 (the power supply of the electrochemical oxidation unit 2 is not tu...

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Abstract

The invention discloses a double-oxidation device and method for advanced treatment of electroplating wastewater, and belongs to the technical field of wastewater advanced treatment processes. The double-oxidation device for advanced treatment of electroplating wastewater comprises an electro-catalytic Fenton oxidation unit and a narrow-channel electrochemical oxidation unit which are sequentiallyconnected in series, wherein an anode of the narrow-channel electrochemical oxidation unit is a microporous tubular membrane electrode with a titanium-based ruthenium dioxide eutectic structure. Thenarrow-channel electrochemical oxidation unit is connected in series behind the electro-catalytic Fenton oxidation unit, so that a complex formed by iron and an organic acid organic matter degradationintermediate is subjected to complex breaking at the anode of narrow-channel electrochemical oxidation, and the COD removal efficiency is improved; meanwhile, aiming at the electroplating wastewater,the anode of the narrow-channel electrochemical oxidation unit adopts the microporous tubular membrane electrode with the titanium-based ruthenium dioxide eutectic structure, so that strong acid corrosion is avoided, hypochlorous acid can be formed to generate a synergistic oxidation reaction with electro-catalytic Fenton oxidation, and the COD removal efficiency is further improved.

Description

technical field [0001] The invention belongs to the technical field of wastewater advanced treatment technology, and more specifically relates to a double oxidation device and method for advanced treatment of electroplating wastewater. Background technique [0002] The electroplating industry is an industry related to the national economy and the people's livelihood, ranging from heavy equipment to small coins, lighter windshields, etc., all of which have undergone electroplating before they are released. COD in the electroplating process mainly comes from three aspects: electroplating pre-treatment process, electroplating process, and electroplating post-treatment process. COD in electroplating wastewater is mainly various additives and organic complexing agents contained in some plating species. These additives are multi-component high-carbon chain organic compounds. Generally speaking, the COD value in electroplating wastewater is not high, but due to the different types...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F1/461C02F1/72C02F103/16C02F101/34
CPCC02F1/001C02F1/4672C02F1/52C02F1/722C02F9/00C02F2101/34C02F2103/16C02F2301/08C02F2305/026
Inventor 韩卫清崔韬刘润戴君诚魏卡佳王连军刘晓东孙秀云李健生沈锦优
Owner NANJING UNIV OF SCI & TECH
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