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Recovery treatment method for wastewater generated in production of carboxymethyl cellulose

A technology for carboxymethyl cellulose and waste water production, which is applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Salt recovery and other problems, to achieve the effect of less difficulty in operation and management, good effect, and reduced energy consumption

Inactive Publication Date: 2012-03-21
广东慧信环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] On the other hand, during the production of carboxymethyl cellulose (CMC), a large amount of high-concentration and high-salt organic wastewater will be produced, and the wastewater also contains refractory substances that can inhibit microorganisms, which has poor biodegradability and is harmful to the environment. sex serious
At present, there are many researches on CMC production wastewater treatment methods at home and abroad. For example, Pan Luting of Jilin University and others use micro-electrolysis-UASB-contact oxidation to treat CMC wastewater. This treatment method can only remove about 35% of COD, and subsequent biochemical treatment is required. , did not recover the effective salt in the wastewater, wasting resources
Another example is that CN102153224A discloses a kind of sodium carboxymethyl cellulose industrial sewage treatment process, promptly carries out multi-effect evaporation, centrifugation, washing, drying to industrial salt to the production waste liquid of sodium carboxymethyl cellulose; If the liquid is subjected to multi-effect evaporation treatment, the resulting salt has complex components and poor practicability; at the same time, when concentrated, it will cause low evaporation efficiency, serious corrosion of equipment, and shorten the service life of the evaporator
[0004] At present, the treatment methods of CMC production wastewater in foreign countries include: ultraviolet chlorination method adopted in the United States, hydrogen peroxide treatment process adopted in Japan, resin exchange method adopted in Germany, etc. The methods are different, but none of them can realize the harm of CMC production wastewater. The goal of recycling resources and turning waste into treasure

Method used

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  • Recovery treatment method for wastewater generated in production of carboxymethyl cellulose
  • Recovery treatment method for wastewater generated in production of carboxymethyl cellulose

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A resource treatment method for carboxymethyl cellulose production wastewater, the process flow chart is shown in figure 1 ,Specific steps are as follows:

[0029] 1) Pump the wastewater produced by carboxymethyl cellulose into the adjustment tank, add NaOH, stir, adjust the pH of the wastewater to 8, and perform primary filtration with a filter device to remove impurities such as macromolecular organic matter and suspended solids in the wastewater to obtain the primary filtrate ;

[0030] 2) The primary filtrate is pressurized into the ultrafilter to further filter out harmful substances such as colloidal particles, bacteria, and viruses in the wastewater, and the filtrate is pressurized into the reverse osmosis device for concentration and separation to obtain reverse osmosis concentrate and reverse osmosis permeate;

[0031] 3) Send the reverse osmosis concentrated liquid into the falling film evaporator for concentration and crystallization, and when the concentrat...

Embodiment 2

[0037] A resource treatment method for carboxymethyl cellulose production wastewater, the process flow chart is shown in figure 1 ,Specific steps are as follows:

[0038] 1) Pump the wastewater produced by carboxymethyl cellulose into the adjustment tank, add NaOH, stir, adjust the pH of the wastewater to 9.5, and perform primary filtration with a filter device to remove impurities such as macromolecular organic matter and suspended solids in the wastewater to obtain the primary filtrate ;

[0039] 2) The primary filtrate is pressurized into the ultrafilter to further filter out harmful substances such as colloidal particles, bacteria, and viruses in the wastewater, and the filtrate is pressurized into the reverse osmosis device for concentration and separation to obtain reverse osmosis concentrate and reverse osmosis permeate;

[0040] 3) Send the reverse osmosis concentrated liquid into the falling film evaporator for concentration and crystallization, and when the concentr...

Embodiment 3

[0046] A resource treatment method for carboxymethyl cellulose production wastewater, the process flow chart is shown in figure 1 ,Specific steps are as follows:

[0047] 1) Pump the wastewater produced by carboxymethyl cellulose into the adjustment tank, add NaOH, stir, adjust the pH of the wastewater to 10, and perform primary filtration with a filter device to remove impurities such as macromolecular organic matter and suspended solids in the wastewater to obtain the primary filtrate ;

[0048] 2) The primary filtrate is pressurized into the ultrafilter to further filter out harmful substances such as colloidal particles, bacteria, and viruses in the wastewater, and the filtrate is pressurized into the reverse osmosis device for concentration and separation to obtain reverse osmosis concentrate and reverse osmosis permeate;

[0049] 3) Send the reverse osmosis concentrated liquid into the falling film evaporator for concentration and crystallization, and when the concentra...

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Abstract

The invention discloses a recovery treatment method for wastewater generated in production of carboxymethyl cellulose. The method includes steps that wastewater generated in production of carboxymethyl cellulose after adjustment by PH (potential of hydrogen), preliminary filtering and decontamination flows into an ultrafilter, a reverse osmosis device and an evaporator sequentially to be condensed, crystallized and centrifugally separated to obtain rough sodium chloride which is treated to obtain industrial solid sodium chloride, mother liquor is separated to be continuously condensed, and industrial glycolic acid is obtained after the mother liquor is treated. High-salted difficultly-degraded organic wastewater generated in production of carboxymethyl cellulose is treated by the recoverytreatment method, recovery treatment which can turn harm into good and turn waste into wealth is realized, and prominent economic, social and environmental benefits are achieved. In addition, the recovery treatment method is simple in operation, low in energy consumption, low in treatment cost, free of environment pollution, low in operation management difficulty, stable in operational effect, high in resource utilization efficiency of treatment of wastewater generated in production of carboxymethyl cellulose and effective.

Description

technical field [0001] The invention belongs to the technical field of resource-based treatment of industrial wastewater, and relates to a high-concentration, high-salt-containing refractory organic wastewater, in particular to a method for resource-based treatment of carboxymethylcellulose production wastewater. Background technique [0002] Carboxymethyl Cellulose (CMC for short) is a high-polymer cellulose ether made from natural cellulose, caustic soda and monochloroacetic acid as the main raw materials. CMC is widely used in food, medicine, daily chemical, petroleum, papermaking, textile, construction and other fields because of its excellent water solubility, emulsification, water retention and film-forming properties, and is known as the industrial "monosodium glutamate". [0003] On the other hand, during the production of carboxymethyl cellulose (CMC), a large amount of high-concentration and high-salt organic wastewater will be produced, and the wastewater also con...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01D3/06C01D3/14C07C59/06C07C51/42C02F1/44
Inventor 蒋志飞区叶秀谭铭卓潘江俊
Owner 广东慧信环保有限公司
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