Recycling method of cellulose ether production wastewater

A technology for the production of wastewater and cellulose ether, which is applied in chemical instruments and methods, biological water/sewage treatment, alkali metal chlorides, etc., can solve the problems of increasing hazardous waste treatment costs, environmental hazards, and large limitations, and achieves The effect of reducing production and operation costs, reducing costs, and reducing processing costs

Pending Publication Date: 2021-12-31
广州兰德环保资源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] A method for resource recycling of cellulose ether production wastewater proposed by the present invention solves the limitations of existing production wastewater recycling methods, which cause waste of resources, increase the treatment cost of hazardous waste and harm the environment

Method used

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  • Recycling method of cellulose ether production wastewater
  • Recycling method of cellulose ether production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] refer to Figure 1-Figure 2 , a method for recycling waste water from cellulose ether production, comprising the steps of:

[0032] S1. Cool the cellulose ether production wastewater resources, and filter after cooling to filter out visible particles;

[0033] S2. The filtered cellulose ether production wastewater resource enters the membrane separation system, and the dope and filtrate are produced through membrane separation;

[0034] S3. The permeate after membrane separation is evaporated, flashed / cooled, solid-liquid separated, and dried to produce condensed water, crystallized salt, and mother liquor;

[0035] S4. After mixing the dope and the mother liquor, it enters the resin for adsorption, and returns to the membrane separation system after adsorption;

[0036] S5. After adsorption, elution is performed, and after elution, it is discharged to the biochemical process.

[0037] The waste water produced in the cellulose ether production process involved in the...

Embodiment 2

[0047] A Science and Technology Development Co., Ltd. is a high-tech enterprise engaged in the research and development, production and sales of cellulose ether. It is a high-quality enterprise with an annual capacity of 6,000 tons. During the production of cellulose ether, a kind of high-salt wastewater will be produced. Now This method is used to treat the high-salt and high-COD sewage produced by the enterprise's research and development and production of cellulose ether, thereby reducing the difficulty and cost of treatment.

[0048] The actual COD of the wastewater discharged from the production of the enterprise is measured, which is 18000mg / L, and the water volume is about 3000m 3 / d, the salt content in water is high, 7-10%, mainly sodium chloride, the biodegradability of water is poor, the water quality is dark, and the composition of COD is mainly soluble cellulose ether and small molecular organic matter discharged during the production process ,mid product.

[004...

Embodiment 3

[0054] refer to figure 2 Shown process flow chart, its process description is as follows:

[0055] The cellulose ether production wastewater collection pool, which is set up in the wastewater discharge link, prevents the production wastewater from being discharged into the positive water system, collects the cellulose ether production wastewater in a centralized manner, and temporarily stores it;

[0056] Cooling pool, the cooling pool is a process for preliminary treatment of cellulose ether production wastewater, so that the wastewater will settle after cooling down;

[0057] Filter pool, the filter pool is a process for filtering waste water, filtering the settled particles produced after cooling and cooling, and mixing with the finished liquid;

[0058] Membrane separation system pool, the membrane separation system pool performs membrane separation on the filtered wastewater, separates the concentrate and permeate, and treats them separately;

[0059] The evaporation poo...

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Abstract

The invention discloses a recycling method for cellulose ether production wastewater, relates to the technical field of production wastewater treatment, and provides the following scheme aiming at the problems that an existing recycling method for the production wastewater is relatively large in limitation, causes resource waste, increases the treatment cost of hazardous wastes and causes harm to the environment. The method comprises the following steps: S1, cooling the cellulose ether production wastewater resource, and filtering after cooling to remove visible particles; s2, feeding the filtered cellulose ether production wastewater resources to a membrane separation system to generate the concentrated liquid and filtrate through membrane separation; s3, performing evaporation, flash evaporation / cooling, solid-liquid separation and drying on permeate liquid after membrane separation to generate condensate water, crystal salt and mother liquor; s4, mixing the concentrated liquor and the mother liquor, treating the liquid by adsorptive resin, and returning the liquid to the membrane separation system after adsorption. The wastewater recycling method is low in treatment difficulty, and the additional value of resources is increased, so that the cost is reduced, and the discharge of mother liquor is reduced.

Description

technical field [0001] The invention relates to the technical field of production wastewater treatment, in particular to a resource recovery method for cellulose ether production wastewater. Background technique [0002] In the production process of cellulose ether, a high-salt wastewater will be produced, which is characterized by high COD content of about 50,000-100,000 ppm, dark color, high salt content of about 7-10%, and a small amount of product. The wastewater cannot be directly biochemically treated, so most manufacturers use direct evaporation treatment, dilute the condensed water generated during the evaporation process and then enter biochemical treatment, and discharge it up to the standard after biochemical treatment. There are many impurities and dark color can only be treated as hazardous waste. This method has generated hazardous waste treatment costs, increased the production cost of wastewater for enterprises, and caused a waste of resources. [0003] The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C01D3/14C01D3/04C02F103/36
CPCC02F9/00C01D3/14C01D3/04C02F2103/36C02F1/001C02F1/44C02F1/04C02F1/06C02F1/285C02F2303/16C02F3/00C01P2006/80
Inventor 蔡耿林黎锋毕永锐舒俭
Owner 广州兰德环保资源科技有限公司
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