Two-stage dynamic membrane filtering method for printing and dyeing wastewater recycling

A printing and dyeing wastewater and filtration method technology, applied in the direction of filtration separation, separation method, chemical instrument and method, etc., can solve the problems of high operating cost, inconvenient operation and maintenance, etc., and achieve the effect of convenient operation and maintenance

Inactive Publication Date: 2008-07-23
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a two-stage dynamic membrane filtration method for reuse of printing and dyeing wastewater to solve the defects of high operating cost and inconvenient operation and maintenance in the prior art

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  • Two-stage dynamic membrane filtering method for printing and dyeing wastewater recycling

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Effect test

Embodiment 1

[0024] After the printing and dyeing wastewater of a printing and dyeing factory undergoes biochemical + physical chemical treatment, the effluent reaches the first-level discharge standard of GB4287-92. The main indicators of effluent water quality are: COD3 / d The waste water treatment station can only meet the total requirement if it is reused. The effective volume of biological aerated filter is 25m 3 , using Φ20mm porous spherical suspension filler, 600-mesh filter cloth at the weir in the outlet tank, the primary dynamic membrane material is activated carbon powder with an average particle size of 0.1mm, and the average pressure difference at the water outlet is about 1m. An aeration pipe is installed under the filter cloth, and backwashing can be carried out by combining water and air. The inorganic ceramic membrane tube used in the microfiltration stage is a single-hole tube with an inner diameter of 11mm and a length of 1100mm. It adopts internal pressure cross-flow f...

Embodiment 2

[0026] The effluent water quality of the printing and dyeing desizing wastewater treatment system of a printing and dyeing factory meets the first-level discharge standard of GB4287-92. In order to reuse it in the desizing stage of the production process, the daily treatment capacity is 250m 3 / d depth processing device. The effective volume of biological aerated filter is 80m 3 , using microporous aeration, the dissolved oxygen in the pool is greater than 4mg / L, anthracite is used as the filter material, and the filling rate is greater than 50%. The lower part enters the upper part of the water, and the weir in the outlet tank has a 600-mesh filter cloth. The first-stage dynamic membrane material is diatomite with an average particle size of 0.1mm, and the average pressure difference at the outlet is about 1m. An aeration pipe is installed under the filter cloth, and backwashing can be carried out by combining water and air. The inorganic ceramic membrane tube used in the m...

Embodiment 3

[0028] After the wastewater treatment of a knitting printing and dyeing factory is cleaned and diverted, the main indicators of the water quality of the cleaned sewage are: COD3 / d Sewage treatment station, the effluent can be reused for the first stage of rinsing and miscellaneous domestic water. Water quality requirements ① Chromaticity (dilution factor) ≤ 10 ② Transparency (cm) ≥ 30 ③ pH 6.5~8.5 ④ Iron (mg / L) ≤ 0.1 ⑤ Manganese (mg / L) ≤ 0.1 ⑥ SS (mg / L) ≤ 10 ⑦ Total hardness (CaCO 3 Count, mg / L) ≤ 450. The effective volume of biological aerated filter is 80m 3 , using microporous aeration, the dissolved oxygen in the pool is greater than 4mg / L, ceramsite and activated carbon are used as filter materials, the upper part enters the water and the lower part exits, the weir in the outlet tank is 600 mesh filter cloth, and the first-class dynamic membrane material is an average particle size of 0.1 mm kaolin, the concentration of kaolin in the outlet tank is 5g / L, and the average...

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Abstract

The invention relates to a double-level dynamic film filtering method used for recycling waste water generated by printing and dyeing process. The method includes the following steps: (1) the waste water is filled into an aeration biology filtering pool for biodegradation; (2) a first level filtering is carried out in a draining groove of the aeration biology filtering pool; (3) the water drained from the aeration biology filtering pool is filled into an intermediate pool containing dynamic film suspended granules; (4) the granules are settled onto the inner wall of a ceramic film tube through a interlacing filter method to form a second level dynamic film filtering; (5) when the dynamic film thickens and the jam to film holes becomes serious and a flux reduces greatly, a backwashing is carried out for the film tube. The invention has convenient operation and maintenance. When the pollution to the film of the dynamic film filtering reaches a certain degree, the flux of the film can be restored through hydraulic backwashing, with no need of replacing base material of films.

Description

technical field [0001] The invention belongs to the field of sewage treatment, in particular to a method for recycling printing and dyeing wastewater. Background technique [0002] The textile industry is one of the important pillar industries of my country's national economy, and it is also an industry with serious pollutant discharge. The sewage discharge of the printing and dyeing industry is the main part of the textile industry's sewage discharge. In recent years, my country's printing and dyeing industry is still developing vigorously, and the trend of investment expansion and reproduction is obvious. However, the total amount in economically developed areas has been basically saturated, and the development of the printing and dyeing industry has encountered environmental "bottleneck" problems. The urgent task at present is to transform a large number of existing printing and dyeing wastewater treatment facilities to improve treatment efficiency, increase the reuse rat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D37/00C02F3/02
CPCY02W10/10
Inventor 李方柳林李炜杨波陈季华
Owner DONGHUA UNIV
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