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PVA precipitant and processing method for desizing waste water

A technology for desizing wastewater and treatment method, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of low recycling value, large consumption, difficult reuse of PVA sedimentation agent, etc., to achieve good recycling value, The effect of reducing consumption

Inactive Publication Date: 2009-01-07
林启贤
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing PVA settling agents mainly absorb PVA in desizing wastewater by forming high-molecular-weight inorganic complexes. PVA settling efficiency is not high and it is easy to carry other impurities. Oxygen (COD) meter dropped to about 1500~6000mg / L
The PVA obtained by sedimentation contains a large amount of PVA sedimentation agent and other impurities adsorbed by the sedimentation agent, and the recycling value is not high; in addition, the PVA sedimentation agent is difficult to reuse, the consumption is large, and the operating cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] At 1000m with a PVA concentration of 3g / L and a pH of 13 3 Add primary Cu(OH) to desizing wastewater to be treated 2 1.6 tons, after standing for 2 hours, filtered through the filter tank to obtain 10 tons of filter residue and primary purified water with COD less than 1500mg / L.

[0020] Add 40% H to the obtained 10 tons of filter residue 2 SO 4 2.37 tons, get 2.47 tons of CuSO 4 , the recovery rate of copper salt reaches 94.7%, and the recovered PVA sedimentation agent is returned to the process.

Embodiment 2

[0022] With 7.0 tons of CuSO 4 and 3.5 tons of NaOH to produce primary Cu(OH) 2 4.28 tons, add 1000m of PVA concentration of 10g / L, PH of 11 3 In the desizing wastewater to be treated, after standing for 2 hours, filter through the filter tank to obtain 32 tons of filter residue and primary clean water with COD less than 1550mg / L.

[0023] Add 40% H to the obtained 32 tons of filter residue 2 SO 4 10.5 tons, get 6.42 tons of CuSO 4 , the recovery rate of copper salt reaches 91.7%, and the recovered PVA sedimentation agent is returned to the process.

Embodiment 3

[0025] At 1000m with a PVA concentration of 1g / L and a pH of 12 3 Adding primary Cu(OH) to the desizing wastewater to be treated 2 0.69 tons, after standing for 2 hours, filtered through the filter tank to obtain 3 tons of filter residue and primary purified water with COD less than 1500mg / L.

[0026] Add 40% H to the obtained 3 tons of filter residue 2 SO 4 1.5 tons, get 960Kg CuSO 4 , the recovery rate of copper salt reaches 96%, and the recovered PVA sedimentation agent is returned to the process.

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PUM

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Abstract

The invention discloses a PVA settling agent and a method for treating desizing wastewater, wherein the PVA settling agent is composed of nascent Cu(OH)2. Coordination polymer formed by the settling agent and PVA has strong specificity, and is not easy to absorb other impurities of a solution; the settling agent can be recycled; and recycled PVA has high purity because of not containing the settling agent, thus having high utilization value.

Description

technical field [0001] The invention relates to a PVA sedimentation agent and a treatment method for desizing wastewater. Background technique [0002] Sizing is a process used to prevent yarn fluffing, reduce end breakage, and facilitate weaving processing. The raw material for sizing is mainly high-molecular polyvinyl alcohol (PVA), and carboxymethyl cellulose, starch, etc. are used together. The pollution of sizing wastewater is serious, and the PVA content is generally 5000~50000mg / L in terms of chemical oxygen demand (COD). Since PVA is difficult to degrade biochemically, it is necessary to pretreat the desizing wastewater, that is, to use a PVA settling agent to settle most of the PVA. Most of the existing PVA sedimentation agents are metal salts, which can be divided into two categories: aluminum salts and iron salts: aluminum salts are mainly aluminum sulfate, aluminum chloride, basic aluminum sulfate, and basic aluminum chloride; Mainly ferric sulfate, ferric chlo...

Claims

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Application Information

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IPC IPC(8): C02F1/52
Inventor 林啟贤
Owner 林启贤
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