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Polyester wastewater treatment method

A treatment method and waste water technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of low treatment efficiency, large area occupied by the treatment system, and failure of polyether waste water to meet the standard Emissions and other issues to achieve the effect of improving treatment efficiency, increasing contact area, and reducing land occupation

Active Publication Date: 2014-09-10
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, and the treatment efficiency is low. A new polyether wastewater treatment method is provided. method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The water quantity and water quality of the treated polyether-containing wastewater are shown in Table 1.

[0019] Table 1

[0020] amount of water

rice 3 / sky

3040

pH value

-

6.8

COD

mg / L

3600

BOD / COD

-

0.1

[0021] 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.

[0022] 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.

[0023] There is a filter screen in the biochemical pool, and the biochemical aeration pressure is 0.65kgf / 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. The biochemical pool covers an area of ​​154m 2 .

[0024] In the ac...

Embodiment 2

[0029] 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.

[0030] 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.

[0031] There is a filter screen in the biochemical pool, and the biochemical aeration pressure is 0.9kgf / 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. The biochemical pool covers an area of ​​154m 2 .

[0032] 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 .

[0033] Add flocculant sodium polyacrylate to the secondary settling tank, and the concentration of sodi...

Embodiment 3

[0037] 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.

[0038] 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.

[0039] The biochemical tank is equipped with filler, the filler is fluidized, the volume ratio of the filler is 75%, 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. The biochemical pool covers an area of ​​154m 2 .

[0040] In the activated sludge tank, the concentration of activated sludge is 3400 mg / L, the oxygen content in water DO=1.8 mg / L, and the biochemical aeration pressure is 0.95 kgf / m 2 .

[0041] Add flocculant sodium polyacrylat...

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Abstract

The invention relates to a polyether wastewater treatment method for mainly solving the problem of the prior art that the polyester wastewater with low COD (Chemical Oxygen Demand) and high BOD (Biochemical Oxygen Demand) / COD cannot be discharged up to the standard, the treatment system takes up large space and the treatment efficiency is low. The polyether wastewater treatment method disclosed by the invention discharges the polyester-containing wastewater of which the BOD / COD is not larger than 0.1 mg / L and the COD is not smaller than 1500 mg / L after treatment of a regulation tank, a biochemical tank, an activated sludge tank and a secondary sedimentation tank, so that the COD of the discharged wastewater is not larger than 250 mg / L, the content SS of suspended solids is not larger than 250 mg / L, and the content of NH3-N is not larger than 7 mg / L, wherein the biochemical tank is internally provided with a material for increasing the contact area between bacteria and the polyester-containing wastewater; the biochemical aeration pressure is 0.6-1.2 kgf / m<2>; the MH3-N content in the biochemical tank is controlled to be not larger than 25 mg / L, the oxygen content DO in the water is within 1.0-5.0 mg / L, so the technical scheme well solves the problem and can be used in industrial production of polyester wastewater treatment.

Description

technical field [0001] The invention relates to a treatment method for polyether 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, and poor in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 陈凤秋徐文跃姚国青卢虎向
Owner JIANGSU CHANGHUA POLYURETHANE SCI & TECH