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Device and method for improving biological treatment efficiency of trademark fabric production wastewater

A technology for biological treatment and production of wastewater, applied in the field of environmental protection, can solve problems such as high sludge output, low treatment efficiency, and large consumption of chemicals

Pending Publication Date: 2021-08-20
HUZHOU SINY LABEL MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high concentration of organic matter in wastewater and the presence of refractory organic matter, chemical methods such as coagulation sedimentation and advanced oxidation are generally used for treatment, which has the problems of large dosage of chemicals, high sludge output, and high cost of sewage treatment.
Biological treatment has the characteristics of low cost and wide application range of water quality, and is the mainstream process of sewage treatment. However, when treating refractory organic wastewater, there are problems of low treatment efficiency and difficulty in meeting discharge standards; in addition, due to the high alkalinity of wastewater treatment , a large amount of acid must be added to neutralize the alkalinity, and the adjustment of wastewater pH needs to consume a large amount of chemicals

Method used

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  • Device and method for improving biological treatment efficiency of trademark fabric production wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for improving the biological treatment efficiency of trademark fabric production wastewater, comprising the following steps:

[0038] (1) A trademark cloth production enterprise produces 450 t / d of finishing waste water in the production process, with a COD of about 4500 mg / L and a pH of 12, and a coating waste water of 500 t / d with a COD of about 2500 mg / L , the pH is 7.0, and the total antimony concentration is 2 mg / L. Such as figure 1 As shown, the finishing wastewater and coating wastewater are pretreated in the regulating tank-facultative tank-first-stage sedimentation tank respectively. Clean up the wastewater and add FeCl to the influent of the adjustment tank 2 , the dosage is 1.1 kg / t waste water. The hydraulic retention time of the coating wastewater in the regulating tank and the facultative tank were 24 h and 24 h, respectively. The hydraulic retention time of the treated wastewater in the regulating tank and the facultative tank were 32 h and 4...

Embodiment 2

[0044] A method for improving the biological treatment efficiency of trademark fabric production wastewater, comprising the following steps:

[0045] A trademark fabric manufacturer discharges 300 tons of coating wastewater and 300 tons of finishing wastewater every day. Such as figure 1 As shown, the COD of the finishing waste water is 4800 mg / L, the COD of the coating waste water is 3000 mg / L, and FeCl 2 The dosage is 1.3 kg / t wastewater, FeCl 2 The final pH was 10.6. The hydraulic retention time of the finishing wastewater in the regulating tank and the facultative tank are 48 h and 60 h respectively, and the pH of the effluent from the first-stage sedimentation is 8.2. The hydraulic retention time of the coating wastewater in the regulating tank and the facultative tank were 24 h and 32 h, respectively. 35% of the sludge in the first-level sedimentation tank of the coating wastewater is returned to the regulating tank, 20% is returned to the facultative tank, and 45% i...

Embodiment 3

[0047] use as figure 1 A treatment device for biological treatment to improve the biological treatment efficiency of trademark fabric production wastewater, including the following steps: Step 1): finishing wastewater and coating wastewater are subjected to quality-based pretreatment in a regulating tank, a facultative tank and a first-grade sedimentation tank respectively , add an appropriate amount of FeCl to the influent of the adjustment tank for wastewater treatment 2 ; Step 2): The sludge in the first-stage sedimentation tank in the two pretreatment processes is returned to the regulating tank and the facultative tank respectively, and part of it is discharged into the sludge thickening tank, and the sludge is dehydrated and then transported for disposal; Step 3) : Discharge the effluent from the first-stage sedimentation tank of the two pretreatment processes into the aerobic tank. The aerobic tank adopts the operation mode of combining aeration and static sedimentation...

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Abstract

The invention relates to a device and a method for improving biological treatment efficiency of trademark fabric production wastewater through sludge reduction. The device comprises a coating wastewater treatment system and a finishing wastewater treatment system which are connected in parallel, an outlet of the coating wastewater treatment system and an outlet of the finishing wastewater treatment system are respectively connected with an inlet of an aerobic tank, and an outlet of the aerobic tank is connected with an inlet of a second-stage sedimentation tank. The method comprises the following steps: (1) adding a proper amount of FeCl2 into inlet water of a regulating reservoir for finishing wastewater; (2) enabling sludge in a first-stage sedimentation tank in two pretreatment processes to flow back to the regulating reservoir and a facultative tank respectively; (3) discharging effluent of the first-stage sedimentation tank of the two pretreatment processes into an aerobic tank, wherein the aerobic tank adopts an aeration and static sedimentation combined operation mode; and (4), enabling part of the sludge in the second-stage sedimentation tank to flow back to the regulating reservoir for the coating wastewater and the finishing wastewater, and enabling part of the sludge to flow back to the aerobic tank. According to the method, the biological treatment efficiency of the wastewater can be improved while sludge reduction is achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a device and a method for improving biological treatment efficiency of trademark fabric production wastewater through sludge reduction. Background technique [0002] Label fabric production belongs to one of the subdivided fields of the textile printing and dyeing industry. It mainly produces coated and uncoated label fabrics for printing labels. The types of products include ordinary ribbons, dyed label belts, coated belts, polyester belts, and cotton belts. , non-woven belts, etc., are widely used in clothing, shoes and hats, bags, toys, bedding, travel products, gift packaging and other fields that require trademarks. The production of trademarked fabrics mainly includes spinning, warping, bleaching and dyeing, setting, coating, calendering and other processes. The wastewater generated not only contains pollutants such as dyes and pastes contained ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/20C02F101/30C02F103/30
CPCC02F9/00C02F2103/30C02F2001/007C02F3/30C02F2301/043C02F2303/06C02F1/66C02F2305/06C02F2101/20C02F2101/30C02F1/281C02F3/006
Inventor 吴丹丹吴翔强杨佳盛
Owner HUZHOU SINY LABEL MATERIAL
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