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PVA-containing desizing wastewater treatment method

A technology for desizing wastewater and treatment method, which is applied in textile industry wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of wastewater treatment impact, low BOD removal rate, etc. Cleaning treatment, COD and BOD removal rates are not high and efficient, and the effect of improving the treatment effect

Pending Publication Date: 2022-07-22
山东海景天环保科技股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for treating desizing wastewater containing PVA, to solve the problem of COD in the desizing wastewater mainly based on PVA in the printing and dyeing industry, the removal rate of BOD is not high, and it has a greater impact on other wastewater treatment. question

Method used

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  • PVA-containing desizing wastewater treatment method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A PVA-containing desizing wastewater treatment method, comprising the following steps:

[0031] S1. The desizing wastewater containing PVA enters the first-stage sewage coagulator, and PAC and / or decolorizing agent are added to the first-stage sewage coagulator for coagulation; The dosage of dosage is 500mg / L. The flocculation sedimentation enters the sludge thickening tank, and the supernatant enters the intermediate tank.

[0032] S2. The effluent from the first-stage sewage coagulator enters the Fenton oxidation system through the lift pump for oxidation; in the Fenton oxidation tower, H 2 O 2 The total dosage is 100mmol / L, the pH is controlled to 3.5, the amount of iron filings is 10g / L, the reaction time is 30min, the effluent PVA concentration is 0.94mg / L, the removal rate is 97%, the COD removal rate is 22.3%, BOD / COD From 0.12 of the original technology to 0.29, the biodegradability is improved.

[0033] S3. The effluent from the Fenton oxidation system ente...

Embodiment 2

[0037] A PVA-containing desizing wastewater treatment method, comprising the following steps:

[0038] S1. The desizing wastewater containing PVA enters the first-stage sewage coagulator, and PAC and / or decolorizing agent are added to the first-stage sewage coagulator for coagulation; The dosage of dosage is 500mg / L. The flocculation sedimentation enters the sludge thickening tank, and the supernatant enters the intermediate tank.

[0039] S2. The effluent from the first-stage sewage coagulator enters the Fenton oxidation system through the lift pump for oxidation; in the Fenton oxidation tower, H 2 O 2 The total dosage is 150mmol / L, the pH is controlled at 4, the amount of iron filings is 15g / L, the reaction time is 30min, the effluent PVA concentration is 0.9mg / L, the removal rate is 99%, the COD removal rate is 23.6%, BOD / COD From 0.12 of the original technology to 0.34, the biodegradability is improved.

[0040] S3. The effluent from the Fenton oxidation system enters ...

Embodiment 3

[0044] A PVA-containing desizing wastewater treatment method, comprising the following steps:

[0045] S1. The desizing wastewater containing PVA enters the first-stage sewage coagulator, and PAC and / or decolorizing agent are added to the first-stage sewage coagulator for coagulation; The dosage of the dosage is 800mg / L. The flocculation sedimentation enters the sludge thickening tank, and the supernatant enters the intermediate tank.

[0046] S2. The effluent from the first-stage sewage coagulator enters the Fenton oxidation system through the lift pump for oxidation; in the Fenton oxidation tower, H 2 O 2 The total dosage was 200mmol / L, the pH was controlled at 4, the amount of iron filings was 15g / L, the reaction time was 30min, the effluent PVA concentration was 0.89mg / L, the removal rate was 99.2%, the COD removal rate was 24.1%, and the BOD / COD From 0.12 of the original technology to 0.35, the biodegradability is improved.

[0047] S3. The effluent from the Fenton ox...

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Abstract

The invention relates to a PVA-containing desizing wastewater treatment method, and aims to solve the problems that PVA-based desizing water is complex in component, high in organic matter content and poor in biodegradability, and PVA-containing wastewater can cause other adverse effects on a receiving water body when being discharged to the receiving water body, PAC and / or a decolorizing agent are / is added into a first-stage sewage coagulation device, effluent enters a Fenton oxidation process system, and the wastewater enters a second-stage sewage coagulation device. The treatment technology comprises the following steps: carrying out secondary sewage coagulation on effluent obtained by carrying out oxidation reaction on H2O2 and scrap iron, carrying out secondary flocculation treatment by adding PAC and PAM, and carrying out SBR biological treatment. According to the technical scheme, the desizing wastewater is independently pretreated, the content of PVA and other organic matters in the desizing wastewater is greatly reduced, then the desizing wastewater is mixed with other printing and dyeing wastewater for treatment, and the treatment effect of the printing and dyeing wastewater can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment equipment, and in particular relates to a method for treating desizing wastewater containing PVA. Background technique [0002] Desizing wastewater is the use of chemicals to hydrolyze the pulp carried on the fabric to form soluble substances, which are then removed. The amount of water is small, but the concentration of pollutants is too high, and it contains various slurries, slurry decomposition products, lint, starch alkali and various auxiliaries, making the wastewater alkaline. The desizing wastewater mainly composed of polyvinyl alcohol (PVA) has complex composition, high organic content and poor biodegradability. The untreated wastewater containing PVA is directly diluted into the water body for treatment, which has a great impact on the subsequent biochemical treatment, and contains PVA. The discharge of wastewater to receiving water bodies will also cause other adverse effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/34C02F103/30
CPCC02F9/00C02F2103/30C02F2101/34C02F1/5236C02F1/722C02F1/56C02F2305/026C02F11/12C02F11/122C02F3/00
Inventor 孙建忠燕锡尧孙涛魏国强张英祁佳瑞刘文玉张冠军刘足华秦军
Owner 山东海景天环保科技股份公司