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Method and device for separate treatment of alkali weight reduction wastewater

A technology for alkali reduction wastewater treatment and quality separation, which is applied in textile industry wastewater treatment, water/sewage treatment, water/sewage multi-stage treatment, etc. The problems of rising costs and difficulty in stably reaching the standard of effluent can achieve the effects of reducing the amount of odorous gas generated, reducing the hydraulic retention time, and reducing the salt content

Active Publication Date: 2020-12-01
浙江丰林染整有限公司
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  • Abstract
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Problems solved by technology

However, due to the addition of sulfuric acid, the salinity in the wastewater will be too high, and the high salinity has a great impact on the biological activity of aerobic organisms, which will greatly reduce the volume load of the aerobic biological treatment structure, and the effluent will not meet the standard.
High concentration of sulfate radicals, hydrolysis and acidification of ethylene glycol will produce malodorous gases, and waste gas treatment will increase construction costs and operating costs
[0007] In general, alkali reduction wastewater has high alkalinity, high COD, and poor biodegradability, resulting in large acid consumption and high salinity during treatment, making it difficult for the effluent to reach the standard stably
[0008] The technologies currently developed are all mixed sewage treatment technologies, which do not take into account the discharge of alkali reduction wastewater in actual operation

Method used

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  • Method and device for separate treatment of alkali weight reduction wastewater
  • Method and device for separate treatment of alkali weight reduction wastewater
  • Method and device for separate treatment of alkali weight reduction wastewater

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Embodiment Construction

[0034] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

[0035] The alkali reduction wastewater treatment method of the present invention is a new method that combines reverse osmosis and biological treatment. By diverting the alkali reduction wastewater in different stages, the concentrated water reverse osmosis dilutes the salt to reduce the harm to the biological system, and the regenerated alkali solution is reused. , dilute alkaline water and alkali-reduced washing water are mixed and then biologically treated to achieve the purpose of recycling useful resources and purifying them. In the present invention, the initial alkali reduction wastewater is the alkali reduction concentrated alkaline water, and the subsequent washing and acetic acid neutralization wastewater are collectively referred to as alkali reduction washing water.

[0036] like figure 1 As shown, an alkali reduction waste water qu...

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Abstract

The invention belongs to the technical field of water pollution control in environmental protection and relates to wastewater treatment in the printing and dyeing process, in particular to a method and a device for separately treating alkali-decrement wastewater according to the quality. The method comprises the steps as follows: 1) electrodialysis of concentrated alkali-decrement alkaline water for liquid alkali recovery: concentrated alkali-decrement alkaline water is collectively collected and pumped into an electrodialysis device, and separated regenerated alkaline water is supplemented with sodium hydroxide and reused in an alkali-decrement production link; 2) acidification and filter pressing of alkali-decrement washing wastewater and diluted electrodialysis alkaline water for separation of terephthalic acid; 3) filtrate neutralization: filtrate is neutralized until the pH ranges from 6 to 8.4 with an electrodialysis regenerated alkali liquid; 4) degradation of remaining organic matter with a biological method. According to the developed technology for separately treating alkali decrement wastewater according to the quality, alkali and terephthalic acid in the alkali-decrement production wastewater are recovered step by step, the dosage of acid and alkali is reduced, the impact of the alkali-decrement production wastewater on a biological system is reduced, and the method has the advantages that energy consumption is low, the dosage of agents is small and the like.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and relates to the treatment of alkali-reduction production wastewater in printing and dyeing processes, in particular to a method and device for the quality-separation treatment of alkali-reduction wastewater. Background technique [0002] The alkali reduction process is one of the important methods to improve the performance of polyester fibers. The operation method is to hydrolyze the polyester cloth under the conditions of high pressure, high temperature and high NaOH concentration. The reduction rate is generally 10-20%. This process will produce alkali reduction. amount of waste water. Most of the waste water produced is washing water, and a small part is high-concentration waste lye. Alkali reduction printing and dyeing wastewater contains a large amount of sodium terephthalate (including a large amount of incompletely hydrolyzed oligomers), ethylene glycol, sodium hydroxide,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F103/30
CPCC02F1/001C02F1/4693C02F1/52C02F1/66C02F3/02C02F9/00C02F2103/30
Inventor 王纯王自元魏哲超
Owner 浙江丰林染整有限公司
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