A kind of treatment method of waste water produced by wet process acrylic fiber in a kind of two-step method

A technology for producing wastewater and treatment methods, which can be used in biological water/sewage treatment, sustainable biological treatment, oxidized water/sewage treatment, etc., and can solve the problems of complex pretreatment, difficult to popularize and use, and harsh operating conditions.

Active Publication Date: 2011-12-28
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of these patents focus on the comprehensive waste water of acrylic fiber production in wet spinning process as the treatment object. The treatment method for acrylic fiber waste water in two-step we

Method used

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  • A kind of treatment method of waste water produced by wet process acrylic fiber in a kind of two-step method
  • A kind of treatment method of waste water produced by wet process acrylic fiber in a kind of two-step method
  • A kind of treatment method of waste water produced by wet process acrylic fiber in a kind of two-step method

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Experimental program
Comparison scheme
Effect test

Embodiment 1-7

[0050] In the waste water of two-step wet-process acrylic fiber production in a factory, lime is firstly added to adjust the pH to 6.5; the waste water after pH adjustment first enters the mixing tank 1, and the concentrations of the added magnesium sulfate and PAC in the waste water are 1000mg / L and 200mg respectively / L, then enter the mixing tank 2, add PAM and its concentration in wastewater is 8mg / L.

[0051] The wastewater after flocculation and sedimentation treatment enters the aerobic biochemical tank, and 45mg / L of potassium dihydrogen phosphate is added to the wastewater; the dissolved oxygen is about 4mg / L, the water temperature of the biochemical tank is 20-30°C, and the sludge concentration is 8±1g / L, 70% of which is fixed on the surface of the semi-soft fiber filler, and 30% is suspended in the sewage; the hydraulic retention time is 18h.

[0052] The supernatant after the biochemical treatment enters the Fenton oxidation advanced treatment tank, after adding s...

Embodiment 8-14

[0057] A factory two-step wet process acrylic fiber production waste water, adopts the same treatment process as embodiment 1.

[0058] Among the operating parameters, the addition of magnesium sulfate in the flocculation precipitation is 980mg / L, the addition of PAC is 250mg / L, the addition of PAM is 10mg / L, the hydraulic retention time of the biochemical treatment tank is 12h, and the Fe in the Fenton oxidation 2+ Dosage 1000mg / L, H 2 o 2 The addition amount is 4000mg / L, the reaction time is 5h, other is the same as embodiment 1. See Table 3 for the processing results.

[0059] table 3

[0060]

[0061] The appearance of the effluent in the table is colorless and transparent, pH6-9, COD<160mg / L, which meets the national first-level discharge standard of the acrylic fiber industry, and the acrylonitrile and sodium thiocyanate in the effluent are lower than the detection limit.

Embodiment 15-20

[0063] A factory two-step wet process acrylic fiber production waste water, adopts the same treatment process as embodiment 1.

[0064] Among the operating parameters, among the operating parameters, the addition of magnesium sulfate in the flocculation precipitation is 950mg / L, the addition of PAC is 150mg / L, the addition of PAM is 7mg / L, the hydraulic retention time of the biochemical treatment tank is 16h, and the Fe in the Fenton oxidation 2+ Dosage 950mg / L, H 2 o 2 The addition amount is 3600mg / L, the reaction time is 5h, other is the same as embodiment 1. See Table 4 for the processing results.

[0065] Table 4

[0066]

[0067] The appearance of the effluent in the table is colorless and transparent, pH6-9, COD<160mg / L, and acrylonitrile and sodium thiocyanate in the effluent are below the detection limit.

[0068] The test shows that the effluent COD of this treatment method reaches the national first-level discharge standard of the acrylic fiber industry.

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Abstract

The invention relates to a treatment method of industrial wastewater, in particular to a treatment method of two-step wet acrylic fiber production wastewater. The method comprises the following steps of: a, flocculent settling treatment with a composite flocculating agent for removing compounds of nitrile, amine, cyanogen and the like harmful to organisms, preventing the compounds from adhering and poisoning microbes, removing suspension and colloidal chemical oxygen demand (COD) and lightening the load of a biochemical system; b, aerobic biochemical treatment for degrading organic substancesin the wastewater and removing COD; c, Fenton oxidation deep treatment for oxidizing and decomposing residual organic substances and further removing COD; and d, neutralizing treatment, wherein the produced water after the neutralizing treatment reaches the standards and is discharged or is recycled to the production process. After being treated by the treatment method of the two-step wet acrylicfiber production wastewater, the appearance of the two-step wet acrylic fiber production wastewater is colorless and transparent, the COD removal rate is improved by about 10 to 20 percent compared with a method in the prior art, the COD of the produced water is less than 160mg/L, the treated two-step wet acrylic fiber production wastewater reaches the national grade 1 discharge standard of the acrylic fiber industry, and acrylonitrile and sodium thiocyanate in the produced water are lower than the detection limit.

Description

technical field [0001] The invention relates to a treatment method for industrial waste water, in particular to a two-step wet process acrylic fiber production waste water treatment method. In particular, it refers to a treatment method using sodium thiocyanate as a solvent for two-step wet-process acrylic fiber production wastewater, wherein the two-step wet-process acrylic fiber production wastewater refers to two-step wet spinning process acrylic fiber production wastewater. Background technique [0002] The acrylic fiber production process is divided into two categories: dry spinning and wet spinning. The acrylic fiber wet spinning process using sodium thiocyanate as a solvent is the most commonly used in the industrial production of acrylic fiber, including the use of reactive monomers in thiocyanate Polymerization in sodium solution, the one-step process of direct spinning of the polymer solution; or the two-step process of suspension polymerization of the reaction mon...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/56C02F1/72C02F3/12
CPCY02W10/10
Inventor 马兰兰王道泉高明华赵桂瑜赵璞
Owner CHINA PETROLEUM & CHEM CORP
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