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Technology for processing high-concentration organic wastewater in composite electrochemical method

A technology with high concentration of organic wastewater, applied in the field of composite technology, can solve the problems of high treatment cost and no obvious improvement in treatment efficiency, and achieve the effects of low operating cost, low chemical consumption, and improved biochemical properties

Active Publication Date: 2011-01-26
南京赛佳环保实业有限公司
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  • Application Information

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Problems solved by technology

[0011]Different oxidation treatment technologies have different characteristics and advantages and disadvantages. There are limitations in the application of a single treatment technology, and the patchwork of multi-process methods often leads to repeated adjustment of wastewater pH value, The treatment cost is too high and the treatment efficiency is not significantly improved, etc., the best treatment effect and the lowest treatment cost can be obtained by proper optimization combination and compound combination

Method used

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  • Technology for processing high-concentration organic wastewater in composite electrochemical method
  • Technology for processing high-concentration organic wastewater in composite electrochemical method

Examples

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Embodiment 1

[0044] Pyridine wastewater treatment. A fine chemical company produces 2-chloro-3-amino-4-picoline, raw water quality: COD 13700mg / L, NH 3 -N 1120mg / L, TP 142mg / L, pH 1.5-2.0. By adopting the composite electrochemical process of the present invention, the pH of the raw water meets the requirement of water inflow; it directly enters the oxidation treatment process. The distance between the cathode and anode plates of the multi-dimensional electrode electrolysis reactor is 100mm, and the current density of the reactor is 20mA / cm 2 , multi-dimensional electrocatalytic oxidation section treatment residence time 0.5 hours; micro-electrolysis coupling electro-Fenton oxidation section treatment residence time 1 hour; coagulation precipitation treatment section, add NaOH, adjust the pH value of wastewater to 8.0, and add PAM for coagulation reaction, Effluent after coagulation and sedimentation: COD 162mg / L, removal rate 88%, NH 3 -N 286mg / L, the removal rate is 74%, TP 1.5mg / L, th...

Embodiment 2

[0046] The production wastewater of a pesticide enterprise, the raw water COD is 22400mg / L, and the main pollutants are m-dichloropyridine and o-dichloropyridine. Using this composite electrochemical process to adjust the pH of the raw water to 3.0; enter the multi-dimensional electrocatalytic oxidation section for treatment, the distance between the cathode and anode plates of the multi-dimensional electrode electrolysis reactor is 150mm, and the electrolysis current density is controlled at 15mA / cm 2 , the residence time is 1 hour, and the pH of the effluent in this section is 3.3; then enter the micro-electrolysis coupled electric Fenton oxidation section for treatment, the reaction residence time is 1.5 hours, and the pH rises to 3.7; the coagulation precipitation treatment section, add Ca(OH) 2 Adjust the pH of the wastewater to 9.0, and add PAM for coagulation reaction. After coagulation and sedimentation treatment, the effluent COD is 3578mg / L, and the removal rate is 76...

Embodiment 3

[0048] Fine chemical EDTA (ethylenediaminetetraacetic acid) production wastewater, raw water COD 8800mg / L, pH 2.6. The pH of the raw water has been within the scope required by step A of the present invention, so the raw water can be directly entered into the multidimensional electrocatalytic oxidation section for processing, the distance between the cathode and anode plates of the multidimensional electrode electrolysis reactor is 125mm, and the electrolytic current density is controlled at 20mA / cm The time is 1.5 hours; the residence time of the micro-electrolysis coupling Fenton oxidation section is 2 hours, and the pH is about 4.0 during the treatment process; the coagulation precipitation treatment section, add Ca(OH) 2 Adjust the pH of the wastewater to 9.0, and add PAM for coagulation reaction. After coagulation and precipitation, the effluent: COD 2580mg / L, removal rate 70.6%. The raw water is light yellow and becomes colorless and transparent after treatment.

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Abstract

The invention relates to a technology for processing high-concentration organic wastewater in a composite electrochemical method, which comprises the main four steps of: pH adjustment, multidimensional electrocatalytic oxidization processing, micro coupling electric fenton reaction oxidation processing and coagulating sedimentation processing. The invention has the technical advantage that the technology has good breaking, chain scission, degradation effects to benzene ring organics, heterocyclic organics, polycyclic organics, macromolecule organics and sustaining organics, which have the most difficulty to degradation. Besides, the technology has no obvious selection to various kinds of high-concentration organic wastewater, has broad-spectrum processing effect, and is an effective measurement for pre-processing to high-concentration organic wastewater having difficulty to degradation. The invention is characterized in that the technology uses second-grade electrochemical processing equipment to realize third-grade advanced oxidation combination processing, effectively utilizes H2O2 and Fe2+ generated by the second-grade electrochemical processing equipment, and makes fenton oxidated and coupled in a micro reactor. During the technological processes, the oxidation capacity is strong to weak, and has reasonable distribution. The pH valve of wastewater does not need repeatedly adjusting. The invention has the obvious characteristics of low electric consumption, little medicine consumption, high processing efficiency, and good controllability.

Description

technical field [0001] The invention relates to a composite process for treating toxic, harmful, refractory and high-concentration organic wastewater by using an electrochemical combination technology, and belongs to the field of advanced oxidation technology for treating wastewater. Background technique [0002] Electrochemical method is an effective way to treat refractory organic pollutants in wastewater. This method is a research hotspot in high-concentration organic wastewater treatment technology. [0003] Wastewater discharged from industries such as pesticides, pharmaceuticals, fine chemicals, and dyes not only has a high concentration of organic matter, but also is highly toxic and non-biodegradable. Most of them are persistent organic compounds (POPs), which are extremely harmful to the environment and human body. They are called "three causes" (Teratogenic, carcinogenic, mutagenic) substances, environmental hormones (EDCs) substances, thus such pollutants become ...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F1/461C02F1/52C02F1/66C02F101/30
Inventor 刘秀宁汤捷杜小军林晨贾少伟
Owner 南京赛佳环保实业有限公司
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