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Treatment method of high-concentration resin desorption liquid after deep purification of wastewater

A technology for deep purification and disposal methods, applied in chemical instruments and methods, special compound water treatment, oxidized water/sewage treatment, etc., can solve the problems of high operating costs, high membrane production costs, and large investment in ozone oxidation construction. good handling effect

Active Publication Date: 2011-05-11
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Fenton oxidation has high requirements on pH, and ozone oxidation has the disadvantages of large construction investment and high operating cost.
Membrane filtration also has the disadvantages of high membrane production cost and easy pollution.
Therefore, it is difficult to treat the desorption liquid efficiently and economically by a single treatment process, and it is necessary to use a combination of various processes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] After biochemical treatment of printing and dyeing wastewater, the biochemical tail water is further treated with anion exchange resin to produce a large amount of resin desorption liquid, and the nanofiltration retentate obtained after the resin desorption liquid is passed through the nanofiltration membrane (TOC content is 3000mg / L, pH =9.0-10.5) with 1% (w / w) FeCl 3 ·6H 2 O solution, carried out Coagulation and sedimentation , take the coagulation supernatant for Fenton oxidation, add FeSO 4 ·7H 2 The amount of O is 0.1% (w / w), the amount of 30% hydrogen peroxide solution is 1% (w / w), react for 3 hours, and then mix the oxidized solution after Fenton oxidation with calcium hydroxide emulsion Coagulate and precipitate, adjust the pH=8.5 and then precipitate for 0.5h. The removal rate of TOC in the treated solution is 60%. The treatment liquid obtained after coagulation of calcium hydroxide enters the activated sludge system for further treatment. The influent COD...

Embodiment 2

[0026] 5% (w / w) Al 2 (SO 4 ) 3 18H 2 O solution, carry out coagulation precipitation, take the coagulation supernatant for Fenton oxidation, add FeSO 4 ·7H 2 The amount of O is 0.5% (w / w), the amount of 30% hydrogen peroxide solution is 1% (w / w), react for 3 hours, and then adjust the pH of the oxidized solution after Fenton oxidation to 9.5 with sodium hydroxide solution After precipitation for 0.5h, the removal rate of TOC in the treated solution was 80%. The treatment liquid obtained after coagulation with sodium hydroxide enters the activated sludge system for further treatment. The influent COD is 200mg / L, and the volume of the treatment solution added is 1‰. After 12 hours of treatment, the removal rate of effluent COD is 40%. After repeated experiments, it is proved that the treatment liquid can be returned to the biochemical system of the biochemical tail water section for further biodegradation, and the circulation treatment of the high-concentration desorption ...

Embodiment 3

[0028] The nanofiltration retentate (TOC content: 3000mg / L, pH=9.5-10) obtained by passing the resin desorption liquid through the nanofiltration membrane was treated with 1% (w / w) FeSO 4 ·7H 2 O solution, carry out coagulation and precipitation, take the coagulation supernatant for ozone oxidation, the concentration of ozone introduced is 3mg / L, react for 3h, and then coagulate the oxidation solution after ozone oxidation with calcium hydroxide emulsion Precipitation, adjust pH=10.5 and then precipitate for 0.5h, the removal rate of TOC of the solution after treatment is 65%, BOD 5 / COD cr improved to 0.41. The treatment liquid obtained after coagulation of calcium hydroxide enters the activated sludge system for further treatment. The influent COD is 400mg / L, and the volume of the treatment solution added is 5‰. After 18 hours of treatment, the removal rate of effluent COD is 65%. After repeated experiments, it is proved that the treatment liquid can be returned to the b...

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Abstract

The invention discloses a treatment method of a high-concentration resin desorption liquid after the deep purification of wastewater, belonging to the field of resin desorption liquid treatment. The method comprises the following steps of: intercepting a high-concentration desorption liquid treated with anion exchange resin by using a nanofiltration membrane to obtain high-concentration nanofiltration intercepted liquid and nanofiltration penetrating liquid, wherein the nanofiltration penetrating liquid can be reused as a desorption agent after being oxidized; adding a coagulating agent into the produced high-concentration nanofiltration intercepted liquid to carry out coagulating sedimentation; carrying out Fenton oxidation or ozone oxidation on the supernatant liquid after coagulating sedimentation; adding alkaline liquid into the solution for further coagulating sedimentation after reaction; and returning the liquid after coagulating sedimentation back to the biochemical system of the biochemical tail water stage for further biological degradation. The high-concentration intercepted liquid treated by the method provided by the invention can return back for biological degradation, and the circular treatment of the high-concentration desorption liquid is realized. The method saves treatment cost, avoids secondary pollution and realizes the harmlessness, the reduction and the recycling of the resin desorption liquid.

Description

technical field [0001] The invention relates to a disposal method of resin desorption liquid, specifically, a disposal method of high-concentration resin desorption liquid based on anion exchange resin after deep purification of wastewater. Background technique [0002] Since the reform and opening up, my country's fine chemical industry has developed rapidly and has made important contributions to the take-off of the national economy. However, the wastewater discharged from this industry often has the characteristics of complex components, high concentration, high toxicity, deep color, and difficult biodegradation. The system and the environment have caused serious pollution. Finding a suitable method to effectively treat these wastewaters has become a top priority. [0003] Biotechnology is the most economical technology for wastewater treatment, but after biotechnology, there are still residual products of microbial metabolism and decomposition, toxic substances that cann...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/44C02F1/72
CPCC02F1/42C02F1/442C02F1/78C02F2305/026C02F1/5245C02F1/722C02F1/725C02F3/12C02F9/00Y02W10/10C02F1/72C02F2209/06C02F1/5236C02F1/52C02F2305/02C02F3/1215C02F1/5209
Inventor 李爱民许玲范俊姜笔存蒋淡宁
Owner NANJING UNIV
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