Method for processing acidic wastewater and alkaline wastewater of viscose fiber industry

A technology of acidic wastewater and viscose fiber, applied in chemical instruments and methods, filtration treatment, precipitation treatment, etc., can solve the problems of insufficient recycling of wastewater, achieve good industrial application prospects, save production costs, and simple methods

Active Publication Date: 2019-07-05
HANGZHOU BLUETEC ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the defect of insufficient recycling of waste water in the prior art, and provide a method for treating acid waste water and alkaline waste water in the viscose fiber industry with high recovery efficiency and environmental protection

Method used

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  • Method for processing acidic wastewater and alkaline wastewater of viscose fiber industry
  • Method for processing acidic wastewater and alkaline wastewater of viscose fiber industry

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Embodiment 1

[0037] Such as figure 1 As shown, the method for treating acidic wastewater and alkaline wastewater in the viscose fiber industry in this embodiment includes a treatment method for acidic wastewater and a treatment method for alkaline wastewater.

[0038] Wherein: acid waste water containing mass fraction is 10% sulfuric acid, 12% sulfate, and the treatment method of acid waste water comprises the steps:

[0039] S11. Acidic wastewater and pure water are fed into the diffusion dialysis device at the same time. The acid in the acidic wastewater migrates to the pure water, and the acidic wastewater becomes a raffinate. The main components are salt and a small amount of acid. After receiving the acid, the pure water becomes an acid recovery solution. The mass fraction of sulfuric acid in the acid recovery liquid is 8%, wherein the mass fraction of sodium sulfate is 0.3%; the mass fraction of each substance in the raffinate is: 2% sulfuric acid, 12% sulfate;

[0040] S12, add 5mo...

Embodiment 2

[0051] Such as figure 1 As shown, the method for treating acidic wastewater and alkaline wastewater in the viscose fiber industry in this embodiment includes a treatment method for acidic wastewater and a treatment method for alkaline wastewater.

[0052] Wherein: acid waste water containing mass fraction is 4% sulfuric acid, 10% sulfate, and the treatment method of acid waste water comprises the steps:

[0053] S11. Acidic wastewater and pure water are fed into the diffusion dialysis device at the same time. The acid in the acidic wastewater migrates to the pure water, and the acidic wastewater becomes a raffinate. The main components are salt and a small amount of acid. After receiving the acid, the pure water becomes an acid recovery solution. The sulfuric acid mass fraction of acid recovery liquid is 3.2%, wherein the mass fraction containing sodium sulfate is 0.3%; The mass fraction of each substance in raffinate is: 0.8% sulfuric acid, 10% sulfate;

[0054] S12, add 5mo...

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Abstract

The invention discloses a method for processing acidic wastewater and alkaline wastewater of the viscose fiber industry, and belongs to the field of wastewater processing method. The method comprisesan acid wastewater processing method and an alkaline wastewater processing method. Acids, alkalis, and semi-fibers can be maximally recovered from wastewater. After concentration, acids and alkalis can be returned to the production line. Semi-fibers can be used as a byproduct for sale. The production cost is reduced, and the benefits are increased for enterprises. Salts in wastewater are convertedinto acids, alkalis, and water, resources are recovered and utilized, the problem that waste sodium sulfate cannot be recovered is solved, the amount of discharged solid wastes is reduced, the provided method is applied to viscose fiber production, no wastewater or waste is discharged during the whole technical process, wastewater is recovered and reutilized in the forms of water, acids, alkalis,and semi-fibers, the organic substances are removed through a biochemical method, and the method is simple, green, and environmentally friendly and has a good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of wastewater treatment methods, in particular to a method for treating acid wastewater and alkaline wastewater in the viscose fiber industry. Background technique [0002] Viscose fiber is made of natural fiber, which is prepared through many processes such as lye impregnation, pressing, crushing, aging, carbon disulfide sulfonation, dissolution, mixing, filtration, maturation, injection, acid bath spinning, post-treatment, drying, etc. made. During the process, alkaline wastewater and acidic wastewater are mainly produced. Alkaline wastewater contains about 20-80g / L of alkali, 40-120g / L of hemicellulose, carbon disulfide, sodium sulfide and other substances, while acidic wastewater contains 2- About 10% sulfuric acid, 10-15% sodium sulfate and zinc sulfate. Usually, the acid and alkali wastewater are mixed, and the COD and toxic substances in the wastewater are removed by physicochemical-biochemical processes to a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/30
CPCC02F9/00C02F1/4693C02F1/44C02F1/66C02F1/441C02F1/04C02F1/42C02F2001/007C02F1/001C02F3/12C02F3/02C02F2101/30Y02A20/131
Inventor 朱春燕邓磊张笑维徐璇于赵弟
Owner HANGZHOU BLUETEC ENVIRONMENTAL TECH
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