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Electromembrane coupling type dyeing waste water deep treatment and component recycling method

A printing and dyeing wastewater and advanced treatment technology, which is applied in textile industry wastewater treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of long process flow, achieve short process flow, and solve the problem of limited water supply or sewage discharge problem effect

Inactive Publication Date: 2017-03-22
HOHAI UNIV
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  • Application Information

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Problems solved by technology

This invention can solve the problem of up-to-standard discharge and reuse of printing and dyeing wastewater, but the process is long, and there are problems such as regeneration after adsorbent saturation and disposal after disposal.

Method used

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  • Electromembrane coupling type dyeing waste water deep treatment and component recycling method

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Experimental program
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Embodiment

[0036] The effluent from the secondary settling tank of a biochemical treatment system in a textile printing and dyeing enterprise was used as raw water. The water quality: pH6.9, CODcr 215mg / L, chroma 120.

[0037] (1) Electro-oxidation treatment: wastewater at a current density of 11.5mA / cm 2 1. Under the condition of the tank voltage of 6.5V, after being treated by the electro-oxidation device, the water retention time is 30min, and the effluent water quality: pH is 7.17, CODcr is 76 mg / L, and the chromaticity is 30.

[0038] (2) Submerged ultrafiltration treatment: the ultrafiltration membrane is made of polyvinylidene fluoride (PVDF) hollow fiber membrane, the rated pore size is 0.01μm, the ultrafiltration pressure is 0.15-0.20MPa, the water temperature is 26-28℃, and the recovery of water The rate is 90%.

[0039] Ultrafiltration effluent quality: pH is 7.15, CODcr is 70mg / L, chroma is 20, which meets the requirements of simple reuse water and chroma for printing and dy...

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Abstract

The invention discloses an electromembrane coupling type dyeing waste water deep treatment and component recycling method. According to the method, electrooxidation and membrane system treatment are carried out on outlet water of a secondary sedimentation tank of a dyeing waste water biochemical treatment system. The membrane treatment system comprises submerged ultrafiltration (SMF) and reverse osmosis (RO) filtration. Compared with the prior art, the method has the beneficial effects that the treatment process of the method is short, and the quantity of water for recycling components and final water discharging quantity can be flexibly controlled according to enterprise actual water discharging quantity, water using requirements and pollutant discharging indexes; and at the same time, RO membrane concentrated water can directly meet the emission threshold requirements of the table 2 in Discharge Standard of Water Pollutants for Dyeing and Finishing of Textile Industry (GB4287-2012) and does not need to be treated again, the water supply or pollutant discharging limitation problem of textile dyeing enterprises is effectively solved, and enterprise water saving and emission reduction purposes are achieved.

Description

technical field [0001] The invention belongs to the technical field of printing and dyeing wastewater treatment, and relates to an electro-membrane coupling type printing and dyeing wastewater advanced treatment and quality separation and reuse method. Background technique [0002] The textile printing and dyeing industry is a typical large water consumer and sewage discharger. With the implementation of the "Discharge Standard for Water Pollutants in the Textile Dyeing and Finishing Industry" (GB4287-2012), the requirements for wastewater discharge in the textile printing and dyeing industry have been further increased. A lot of efforts have been made. At present, the printing and dyeing wastewater basically adopts the physical-chemical-biochemical-advanced treatment and discharge process, and the most used technology for advanced treatment is air flotation. This technology can basically meet the discharge requirements for enterprises that implement indirect discharge standa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F101/30C02F103/30
CPCC02F1/441C02F1/444C02F1/4672C02F9/00C02F2101/308C02F2103/30
Inventor 李继洲郑梦洁
Owner HOHAI UNIV
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