An advanced treatment system and method for water reuse in fine chemical tail water

An advanced treatment, fine chemical technology, applied in water/sewage treatment, water/sewage multi-stage treatment, special compound water treatment, etc., can solve the problem of low removal efficiency of organic pollutants, and improve sustainability and degradation efficiency. improved effect

Active Publication Date: 2021-02-02
NANJING UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

[0005] Aiming at the problem of low organic pollutant removal efficiency in the treatment process of fine chemical tail water containing high salt and refractory organic matter in the prior art, the present invention provides an advanced treatment system for fine chemical tail water reuse and In the method, a double oxidation device formed by sequentially connected and interconnected electrocatalytic Fenton oxidation units and narrow channel electrochemical oxidation units is arranged, so that the complexes formed by electrocatalytic Fenton oxidation and iron ions are formed in the Broken network occurs in the narrow-channel electrochemical oxidation unit, which improves the Fenton oxidation efficiency of COD in fine chemical tail water containing high salt; further reverse osmosis treatment is used to realize the reuse of reclaimed water; The salt obtained by direct evaporation of water has low purity and cannot be used as a by-product salt. It can only be used as a problem for hazardous waste treatment. By setting up several stages of double oxidation devices, sedimentation tanks and reverse osmosis devices in series, multi-stage treatment can make COD is reduced to the reuse standard, and then the concentrated water after RO treatment is evaporated to obtain high-purity salt, which can be used as by-product salt to reduce the pressure of hazardous waste treatment in enterprises

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  • An advanced treatment system and method for water reuse in fine chemical tail water
  • An advanced treatment system and method for water reuse in fine chemical tail water
  • An advanced treatment system and method for water reuse in fine chemical tail water

Examples

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Effect test

Embodiment 1

[0063] The three-stage electrocatalytic Fenton / electrochemical double oxidation coupling device + reverse osmosis (RO) system combination process is used to treat the tail water of triazole nitrogen-containing heterocyclic compound pesticide production, and realize the full reuse of pesticide wastewater.

[0064] Pesticide production tail water inflow 500m 3 / d, COD=500mg / L, TDS concentration 4000mg / L.

[0065] A method for advanced treatment of pesticide tail water reuse, such as figure 2 Shown:

[0066] Step 1. At 500m 3 Add sulfuric acid to the pesticide tail water to adjust the pH to 3.0-4.0;

[0067] Step 2. Electrocatalytic Fenton oxidation process: Pesticide tail water is circulated in the double oxidation reaction tank, and at the same time, the electrocatalytic porous composite iron electrode is used to generate Fe 2+ , the electrocatalytic Fenton oxidation current density is 15mA / cm 2 , when the reaction time reaches 4h, open the electrochemical oxidation unit ...

Embodiment 2

[0087] In this embodiment, when the other conditions are basically the same as in Example 1, only different current densities are used in the electrochemical oxidation step: 5mA / cm 2 , 8mA / cm 2 、15mA / cm 2 、20mA / cm 2 、25mA / cm 2The COD removal efficiency of the primary treatment (step 1 to step 3) under the conditions (only the COD removal efficiency of the double oxidation process of the primary treatment is examined), such as image 3 As shown, when the current density is low, the 12hCOD removal efficiency of the pesticide tail water is relatively low; the current density is 8-15mA / cm 2 When , the COD removal efficiency of pesticide tail water is high, and when the current density is increased, the COD removal efficiency will decrease, and to a certain extent, with the increase of current density, the COD removal rate will gradually decrease.

Embodiment 3

[0089] Other conditions in this embodiment are basically the same as in Example 1, the difference is that only the COD removal efficiency of the double oxidation process of primary treatment is investigated, and the electrocatalytic Fenton oxidation current density in the electrocatalytic Fenton oxidation process of step 2 is respectively 5mA / cm 2 , 8mA / cm 2 、10mA / cm 2 、15mA / cm 2 、20mA / cm 2 、25mA / cm 2 , other process conditions are the same, the COD removal efficiency after primary treatment (step 1 to step 3), such as Image 6 As shown, in the 12h of "electrocatalytic Fenton oxidation - electrochemical oxidation", when the electrocatalytic Fenton current density rises from 5 to 20mA / cm 2 During the process, the COD removal rate continued to increase, and when the current density continued to rise from 20 to 25mA / cm 2 , the COD removal rate decreased slightly. This shows that when the Fe released in the system 2+ When the concentration is within a certain range, it can...

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Abstract

The invention discloses an advanced treatment system and method for water reuse in fine chemical industry tail water, and belongs to the technical field of fine chemical industry water reuse technology. The advanced treatment system includes several stages of double oxidation devices, sedimentation tanks and reverse osmosis devices connected in series; the double oxidation device includes electrocatalytic Fenton oxidation units and narrow channel electrochemical oxidation units connected in sequence and interconnected. The double oxidation device can efficiently remove COD in fine chemical tail water. After combined treatment with multi-stage double oxidation device and reverse osmosis device, the fresh water obtained can be reused as recycled industrial water. After the concentrated water is evaporated, the salt content is recrystallized. It can be used as by-product salt to realize near-zero discharge of enterprise wastewater and waste salt.

Description

technical field [0001] The invention belongs to the technical field of water reuse in fine chemical tail water, and more specifically relates to an advanced treatment system and method for water reuse in fine chemical tail water. Background technique [0002] Reclaimed Water Reuse, industrial wastewater undergoes advanced technical treatment to remove organic matter and salt in polluted water, reduce COD, TDS, conductivity, SS, hardness, and ammonia nitrogen in the water, and meet the quality standard for recycled water. [0003] In view of the unique refractory water quality characteristics of high-salt fine chemical production wastewater, the combined process approach of "anaerobic biochemistry (including anaerobic hydrolysis or anaerobic digestion)-aerobic biochemistry-wastewater advanced treatment" is generally adopted. At present, the latest treatment method is to introduce dissolved air flotation, electrocatalytic oxidation, ozone catalytic oxidation, iron-carbon micro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F9/10C02F101/34
CPCC02F1/04C02F1/441C02F1/4672C02F9/00C02F2001/007C02F2101/34C02F2301/08C02F2305/026
Inventor 韩卫清崔韬刘润魏卡佳李维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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