Treatment method for dry acrylic fiber production wastewater

A treatment method and technology for producing wastewater, which are applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, permeation/dialysis water/sewage treatment, etc. Long and other problems, to achieve the effect of good water effluent effect, easy operation and short process flow

Active Publication Date: 2010-06-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the shortcomings brought about by the biochemical treatment process: large area, long process flow, harsh operating conditions, unstable effluent quality, etc., the present invention uses ultrafiltration and reverse osmosis

Method used

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  • Treatment method for dry acrylic fiber production wastewater
  • Treatment method for dry acrylic fiber production wastewater
  • Treatment method for dry acrylic fiber production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1

[0027] Each strand of dry acrylic fiber production wastewater in a factory first enters the mixing homogenization tank for mixing, and adjusts the pH to 6.5 with a 25% NaOH solution, and then enters the powder SiO 2 Dosing tank, add powder SiO with a particle size of 80nm 2 , The concentration is 100mg / L, then enter the coagulation sedimentation tank, add polyaluminum chloride and anionic polyacrylamide successively, the concentrations of which are 200mg / L and 10mg / L respectively, the sedimentation time is 30min, the effluent of the sedimentation tank enters the ultrafiltration device For treatment, the ultrafiltration effluent enters the reverse osmosis device for further processing, and the reverse osmosis effluent is discharged.

[0028] The ultrafiltration membrane adopts polyethersulfone (PES) membrane, the membrane structure is flat plate, the membrane pore size is 0.05μm, and the molecular weight cutoff is 5000. The operating pressure is 0.03MPa, and the m...

Example Embodiment

[0032] Example 2

[0033] The same treatment process as in Example 1 was used for the wastewater produced by the dry-process acrylic fiber production in a certain factory.

[0034] In the operating parameters, the mixing and homogenizing pool is adjusted to pH 7.0 with 25% NaOH solution, powder SiO 2 (The particle size is 60nm), the concentrations of polyaluminum chloride and polyacrylamide are 75mg / L, 140mg / L and 8mg / L, respectively.

[0035] The operating pressure of ultrafiltration treatment is: 0.04MPa, the membrane flux is: 175L / (m 2 ·H), the operating pressure of reverse osmosis treatment is: 0.8MPa, the membrane flux is: 17.1L / (m 2 H), other operating conditions are the same as in Example 1. The treatment results are shown in Table 2.

[0036] Table 2

[0037]

Example Embodiment

[0038] Example 3

[0039] The same treatment process as in Example 1 was used for the wastewater produced by the dry-process acrylic fiber production in a certain factory.

[0040] In the operating parameters, the mixing and homogenizing pool is adjusted to pH 6.7 with 25% NaOH solution, powder SiO 2 (The particle size is 50nm), the concentrations of polyaluminum chloride and polyacrylamide are 50mg / L, 100mg / L and 6mg / L, respectively. The operating pressure of ultrafiltration treatment is: 0.045MPa, the membrane flux is: 181L / (m 2 ·H), the operating pressure of reverse osmosis treatment: 1.3MPa, membrane flux: 19.6L / (m 2 H), other operating conditions are the same as in Example 1. The treatment results are shown in Table 3.

[0041] table 3

[0042]

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Abstract

The invention provides a membrane treatment method for dry acrylic fiber production wastewater, comprising the processes of wastewater homogeneous regulation, coagulating sedimentation, ultrafiltration treatment, reverse osmosis treatment and the like. The method applies a membrane technology to the treatment process of the dry acrylic fiber wastewater; aiming at the characteristics of the wastewater, a corresponding pretreatment measure is adopted, and nano SiO2 powder is added to the coagulating sedimentation process, thereby enhancing the effect of removing oligomers in the wastewater and reducing the pollution of the wastewater to a membrane system. The system runs steadily, and the COD removing effect is good.

Description

Technical field [0001] The invention relates to a method for treating industrial waste water, and more specifically, to a method for producing waste water in dry acrylic fiber production with acrylonitrile (AN) as the first monomer and dimethylformamide (DMF) as the solvent. Approach. Background technique [0002] The DMF dry acrylic fiber production process uses acrylonitrile, methyl acrylate, and sodium styrene sulfonate as the main raw materials to produce polymer through aqueous suspension polymerization, using dimethylformamide as the solvent, and the dry method of heating the carrier with hot nitrogen. Spinning process. [0003] Many stages of acrylic fiber production will produce wastewater, mainly including: wastewater containing unreacted monomers in the process of polymerization and dope preparation, DMF-containing wastewater generated in the spinning and post-treatment process, and the solvent recovery process from spinning condensation. DMF wastewater and DMF-containi...

Claims

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Application Information

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IPC IPC(8): C02F9/02C02F1/52C02F1/44
CPCY02A20/131
Inventor 赵桂瑜高明华赵璞王道泉马兰兰张宾
Owner CHINA PETROLEUM & CHEM CORP
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