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Process for treating printing and dyeing wastewater through combination of MBR and membrane separation method

A technology of printing and dyeing wastewater and membrane separation method, which is applied in the field of membrane separation, can solve the problems of high salinity of effluent, failure to achieve water reuse, etc., and achieve the effect of reducing separation efficiency

Inactive Publication Date: 2018-01-30
安徽名创新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After using this method to treat wastewater, although most of the BOD, COD, SS, ammonia nitrogen, etc. in the wastewater can be removed, the salinity of the effluent is still high, which cannot meet the requirements of water reuse.

Method used

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  • Process for treating printing and dyeing wastewater through combination of MBR and membrane separation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A process for treating printing and dyeing wastewater in combination with MBR and membrane separation method, the specific process is:

[0024] (1) The printing and dyeing wastewater is directly pumped into the coagulation sedimentation tank, and the flocculant polymerized ferric chloride and carboxymethyl chitosan in the coagulation sedimentation tank work together to remove suspended solids or colloidal particles. Ferric chloride and 7mg carboxymethyl chitosan, wherein the wastewater is pumped into the sedimentation tank and first stirred for 20 minutes, so that the flocculant can absorb the suspended matter or colloidal particles in the wastewater, form and then statically settle for 2 hours;

[0025] (2) The supernatant from the upper part of the coagulation sedimentation tank is pumped into the activated carbon adsorption column, and the supernatant is pumped into the sepiolite adsorption column. The small particles of impurities in the supernatant are adsorbed on t...

Embodiment 2

[0029] A process for treating printing and dyeing wastewater in combination with MBR and membrane separation method, the specific process is:

[0030] (1) The printing and dyeing wastewater is directly pumped into the coagulation sedimentation tank, and the flocculant polyferric chloride and carboxymethyl chitosan in the coagulation sedimentation tank work together to remove suspended solids or colloidal particles, and add 40 mg of polymerized ferric chloride per liter of printing and dyeing wastewater Ferric chloride and 9mg carboxymethyl chitosan, wherein the wastewater is pumped into the sedimentation tank and stirred for 25 minutes at first, so that the flocculant can adsorb the suspended solids or colloidal particles in the wastewater, form and then statically settle for 2.5 hours;

[0031] (2) The supernatant from the upper part of the coagulation sedimentation tank is pumped into the sepiolite adsorption column, and the supernatant is pumped into the sepiolite adsorption...

Embodiment 3

[0035] A process for treating printing and dyeing wastewater in combination with MBR and membrane separation method, the specific process is:

[0036] (1) The printing and dyeing wastewater is directly pumped into the coagulation sedimentation tank, and the flocculant polymerized ferric chloride and carboxymethyl chitosan in the coagulation sedimentation tank work together to remove suspended solids or colloidal particles, and add 50 mg of polymer to each liter of printing and dyeing wastewater Ferric chloride and 15mg carboxymethyl chitosan, wherein the wastewater is pumped into the sedimentation tank and first stirred for 30 minutes, so that the flocculant can absorb the suspended matter or colloidal particles in the wastewater, form and then statically settle for 3 hours;

[0037] (2) The supernatant from the upper part of the coagulation sedimentation tank is pumped into the circulation adsorption column. The circulation adsorption column includes a sepiolite adsorption col...

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Abstract

The invention discloses a process for treating printing and dyeing wastewater through combination of MBR and a membrane separation method. The process comprises the concrete steps of directly pumpingthe printing and dyeing wastewater into a coagulative precipitation tank, and removing suspended solids or colloidal particles through a combined action of flocculating agents i.e. polymerization ferric chloride and carboxymethyl chitosan in the coagulative precipitation tank; pumping a supernate at the upper part of the coagulative precipitation tank into a cyclic adsorption column; feeding the supernate adsorbed by the cyclic adsorption column into a hydrolysis acidification pool, carrying out hydrolysis acidification to obtain secondary sewage, and converting dye molecules difficult to degrade into micromolecules easy to biodegrade under the action of a lot of hydrolytic bacteria and acid-forming bacteria in the hydrolysis acidification pool; pumping the secondary sewage into an aerobiotic MBR reactor, wherein water obtained after treatment can be directly discharged. According to the process provided by the invention, the printing and dyeing wastewater is flocculent precipitated, adsorbed and acidized, and is then filtered and separated through a hollow fiber membrane module in the MRR reactor, the separated macromolecule organic matters are degraded through microorganisms in the reactor, and the obtained treatment water can be discharged directly.

Description

technical field [0001] The invention belongs to the field of membrane separation and relates to a process for treating printing and dyeing wastewater by combining MBR and membrane separation. Background technique [0002] Printing and dyeing wastewater has the characteristics of large water volume, high content of organic pollutants, deep color, high alkalinity, and large changes in water quality. It is a difficult-to-treat industrial wastewater. In recent years, due to the development of chemical fiber fabrics, the rise of imitation silk and the progress of printing and dyeing finishing technology, PVA pulp, rayon alkali hydrolyzate (mainly phthalic acid substances), new additives and other difficult biodegradable organic substances Into the printing and dyeing wastewater in large quantities. With the increasingly stringent discharge standards and rising water and sewage charges, printing and dyeing enterprises are paying more and more attention to clean production, and th...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 黄智锋杨家奎康玲郭涛
Owner 安徽名创新材料科技有限公司
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