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Treatment method of polyether-containing wastewater

A treatment method and wastewater technology, which are applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. The problem of large dosage, etc., can improve the wastewater treatment capacity, accelerate the metabolism, and reduce the sludge treatment amount.

Active Publication Date: 2013-09-11
JIANGSU CHANGHUA POLYURETHANE SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that in the prior art, polyether wastewater with high COD and low BOD / COD ratio cannot be discharged up to the standard, the treatment system occupies a large area, the treatment efficiency is low, and the large amount of sludge leads to a large amount of follow-up treatment. Provide a new treatment method for polyether-containing wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The water quantity and water quality of the treated polyether-containing wastewater are shown in Table 1.

[0020] Table 1

[0021] amount of water

rice 3 / sky

3040

pH value

-

6.8

COD

mg / L

3600

BOD / COD

-

0.1

[0022] The above-mentioned polyether-containing wastewater is discharged after being treated in a regulating tank, a biochemical tank, an activated sludge tank and a secondary sedimentation tank.

[0023] Among them, NaOH and potassium dihydrogen phosphate are intermittently added to the adjustment tank every 1 hour, the pH value in the adjustment tank is 9.2, and the total phosphorus content TP=8 mg / L.

[0024] There is a filter screen in the biochemical pool, and the biochemical aeration pressure is 0.2kgf / m 2 , the ammonia-nitrogen content in the biochemical pool NH 3 -N=10 mg / L, oxygen content DO=2.1 mg / L in water.

[0025] In the activated sludge tank, the concentration of activated s...

Embodiment 2

[0030] The polyether-containing wastewater described in Table 1 is discharged through the treatment of the regulating tank, the biochemical tank, the activated sludge tank and the secondary sedimentation tank.

[0031] Among them, NaOH and potassium dihydrogen phosphate are intermittently added to the adjustment tank every 1 hour, the pH value in the adjustment tank is 10.2, and the total phosphorus content TP=18 mg / L.

[0032] There is a filter screen in the biochemical pool, and the biochemical aeration pressure is 0.5kgf / m2 , the ammonia-nitrogen content in the biochemical pool NH 3 -N=10.5 mg / L, oxygen content DO=2.5 mg / L in water.

[0033] In the activated sludge tank, the concentration of activated sludge is 1050 mg / L, the oxygen content in water DO=1.8 mg / L, and the biochemical aeration pressure is 0.95 kgf / m 2 . The activated sludge tank covers an area of ​​154m 2 .

[0034] Add flocculant sodium polyacrylate to the secondary settling tank, and the concentration of...

Embodiment 3

[0038] The polyether-containing wastewater described in Table 1 is discharged through the treatment of the regulating tank, the biochemical tank, the activated sludge tank and the secondary sedimentation tank.

[0039] Among them, NaOH and potassium dihydrogen phosphate are intermittently added to the adjustment tank every 1 hour, the pH value in the adjustment tank is 12.2, and the total phosphorus content TP=12 mg / L.

[0040] The biochemical tank is equipped with filler, the filler is fluidized, the volume ratio of the filler is 35%, and the biochemical aeration pressure is 0.75kgf / m 2 , the ammonia-nitrogen content in the biochemical pool NH 3 -N=10.5 mg / L, oxygen content DO=2.5 mg / L in water.

[0041] In the activated sludge tank, the concentration of activated sludge is 3200 mg / L, the oxygen content in water DO=1.8 mg / L, and the biochemical aeration pressure is 0.85 kgf / m 2 . The activated sludge tank covers an area of ​​154m 2 .

[0042] Add flocculant sodium polyac...

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Abstract

The invention relates to a treatment method of polyether-containing wastewater, which mainly solves the problems of high COD (chemical oxygen demand), incapacity of realizing up-to-standard discharge for polyether wastewater with low BOD / COD (biochemical oxygen demand / chemical oxygen demand) ratio, the large floor area of a treatment system, low treatment efficiency, and high subsequent treatment capacity due to the high dosage of sludge, existing in the prior art. According to the treatment method disclosed by the invention, the problems are solved well by adopting the following technical scheme: the polyether-containing wastewater having a BOD / COD being not greater than 0.1, and a COD being not less than 1500 mg / L is discharged after being treated by an adjusting pool, a biochemical pool, an activated sludge pool and a secondary sedimentation pool, so that in the discharged wastewater, the COD is not greater than 250 mg / L, the suspended solid SS content is not greater than 250 mg / L, and the ammonia-nitrogen content NH3-N is not greater than 7 mg / L; and the concentration of activated sludge in the activated sludge pool is 1000-3800 mg / L, the dissolved oxygen DO in water is 0.5-3.0 mg / L, and the biochemical aeration pressure is 0.6-1.2 kgf / m<2>. The treatment method can be used for industrial production for polyether-containing wastewater treatment.

Description

technical field [0001] The invention relates to a treatment method for polyether-containing wastewater. Background technique [0002] Polyether polyol (PPG) is an important raw material for the synthesis of rigid polyurethane foam, and can also be used as defoamer for paper industry, crude oil demulsifier, lubricant, quenching agent, latex foaming agent, rubber lubricant and special solvent, etc. . Polyether uses glycerol, styrene, acrylonitrile, ethylene oxide, propylene oxide, etc. as raw materials. During the production process, a large amount of high-concentration polyether wastewater will be produced. These wastewaters not only contain a large amount of low-molecular polymerized monomers, but also contain a large amount of high-molecular polyether polyols. Since polyether polyol itself and most of its production raw materials are refractory organic substances, the organic components in the production wastewater are complex, high in concentration, strong in toxicity, a...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/34
Inventor 陈凤秋徐文跃姚国青卢虎向
Owner JIANGSU CHANGHUA POLYURETHANE SCI & TECH
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