Integrated treatment method for high-salinity and high-concentration refractory organic wastewater resulted from cellulose ether production

A treatment method and technology for organic wastewater, applied in biological water/sewage treatment, multi-stage water treatment, water/sewage treatment, etc., can solve problems such as difficult treatment of organic wastewater, and achieve the effect of reducing foam and improving effect

Active Publication Date: 2017-05-31
ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides an integrated treatment method for high-salt, high-concentration, refractory organic wastewater produced from cellulose

Method used

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  • Integrated treatment method for high-salinity and high-concentration refractory organic wastewater resulted from cellulose ether production
  • Integrated treatment method for high-salinity and high-concentration refractory organic wastewater resulted from cellulose ether production
  • Integrated treatment method for high-salinity and high-concentration refractory organic wastewater resulted from cellulose ether production

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Experimental program
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Effect test

Embodiment 1

[0043] The comprehensive waste water COD of the production of methyl cellulose ether and hydroxypropyl methyl cellulose ether is 7000-8000mg / L, NH 4 -N 20~25mg / L, salt content 35~40g / L, after pretreatment of 10L of wastewater in the laboratory each time, four 3L devices are used in series, and the treatment conditions of the biochemical small test are as follows.

[0044] (1) Adjust the pH to 6.0 in the organic wastewater producing methyl cellulose ether and hydroxypropyl methyl cellulose ether, add PAC to a final concentration of 100 mg / L, stir at 300 rpm for 5 minutes, then add PAM to the final concentration Concentration 1mg / L, 100 rpm / min stirring for 5 minutes. Take the supernatant from the static sediment.

[0045] (2) Take the supernatant from the wastewater treated in step (1) to carry out Fenton reaction pretreatment, add 0.8% FeSO 4 (W / V) After stirring and dissolving, use 10% H 2 SO 4 (V / V) adjust pH to 3.0, add 1.6% H 2 o 2 (V / V),H 2 o 2 Add in several time...

Embodiment 2

[0057] An enterprise mainly produces methyl cellulose ether and hydroxypropyl methyl cellulose ether, the comprehensive wastewater volume is 500t / d, COD is 7000-8000mg / L, NH 4 ~N 20-25mg / L, salt content 35~40g / L, the total amount of wastewater discharge from the enterprise has been controlled and cannot be diluted to reduce the salt content for biochemical treatment, and the cost of 500t / d water through three-effect evaporation is too high. Using this integrated technology for wastewater treatment can Meet the emission standards of nanotubes.

[0058](1) Adjust the pH to 6.0 in the organic wastewater producing methyl cellulose ether and hydroxypropyl methyl cellulose ether, add PAC to a final concentration of 100 mg / L, stir at 300 rpm for 5 minutes, then add PAM to the final concentration Concentration 1mg / L, 100 rpm / min stirring for 5 minutes. Take the supernatant from the static sediment.

[0059] (2) Take the supernatant from the wastewater treated in step (1) to carry ou...

Embodiment 3

[0071] An enterprise mainly produces methyl cellulose ether and hydroxypropyl methyl cellulose ether. The high-concentration wastewater volume is about 60-70t / d, the COD is 12000-15000mg / L, and the salt content is 10-15g / L. Due to the high COD of wastewater, The refractory substance cellulose ether contained in the wastewater is also high, about 3.3g / L, so that the treatment becomes more difficult.

[0072] (1) Considering that the amount of high-concentration wastewater is small, the method of low-temperature vacuum distillation and desolventization is adopted. Firstly, the waste water is desolvated by vacuum at 50°C to recycle the solvent. After desolventization, the removal rate of COD is about 30%, and COD can be reduced. To 8000-10000mg / L. The waste water is then treated using an integrated treatment process.

[0073] (2) Adjust the pH of the high-salt organic wastewater produced in cellulose ether to 6.0, add PAC to a final concentration of 100 mg / L, stir at 300 rpm for...

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Abstract

The invention discloses an integrated treatment method for high-salinity and high-concentration refractory organic wastewater resulted from cellulose ether production. The method comprises the steps of (1) carrying out pretreatment on to-be-treated wastewater through coagulating sedimentation and fenton reaction in sequence; (2) carrying out biochemical treatment on fenton reaction effluent through cellulase hydrolysis, anaerobic treatment, first-stage contact oxidation and second-stage contact oxidation in sequence, feeding cellulose to carry out degradation, anaerobic treatment, first-stage contact oxidation and second-stage contact oxidation processes on the wastewater in the cellulose hydrolysis process, adding a salt-tolerant fungicide of producing the cellulose ether to carry out strengthened treatment on the wastewater; and (3) carrying out deep treatment on second-stage contact oxidation effluent through the fenton reaction and finally discharging the effluent. Compared with an existing treatment method, the integrated technology has the characteristics of being high in pertinence, economic and environment-friendly; and problems that the wastewater is high in salinity, high in concentration and refractory are solved for enterprises that produce the cellulose ether.

Description

technical field [0001] The invention relates to the technical field of high-salt, high-concentration, refractory organic wastewater treatment for the production of cellulose ether, in particular to pretreatment, biochemical treatment and advanced treatment methods for producing cellulose ether, high-salt, high-concentration, refractory organic wastewater. Background technique [0002] Cellulose ether is a synthetic polymer made from natural cellulose through chemical modification. Cellulose ether is a derivative of natural cellulose. The production of cellulose ether is different from synthetic polymers. Its most basic material is cellulose, a natural polymer compound. Due to the particularity of the natural cellulose structure, the cellulose itself has no ability to react with etherifying agents, but after being treated with a swelling agent, the strong hydrogen bonds between the molecular chains and within the chains are destroyed, and the active release of hydroxyl groups...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/38
CPCC02F1/5236C02F1/56C02F1/722C02F3/30C02F3/34C02F9/00C02F2103/38C02F2301/08
Inventor 王慧荣梅荣武李明智张宇任旭峰张敏东
Owner ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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