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Method for treating polyether wastewater

A treatment method and wastewater technology, applied in natural water treatment, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of polyether wastewater failing to meet the discharge standard, and the phosphorus content of wastewater failing to meet the discharge standard, etc.

Active Publication Date: 2013-12-18
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, the polyether wastewater with high COD and low BOD / COD ratio cannot be discharged up to the standard, and the phosphorus content in the treated wastewater cannot meet the discharge standard. Treatment method of ether wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The water quantity and water quality of the treated polyether-containing wastewater are shown in Table 1.

[0021] Table 1

[0022] amount of water

rice 3 / sky

3040

pH value

-

6.8

COD

mg / L

3600

BOD / COD

-

0.1

[0023] 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.

[0024] 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.

[0025] 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.

[0026] In the activated sludge tank, the concentration of activated s...

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.

[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 and polyaluminum chloride to the secondary settling tank, and the concentration of sodium polyacrylate in the se...

Embodiment 3

[0036] 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.

[0037] 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.

[0038] 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 0.5kgf / 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.

[0039] 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 .

[0040] Add flocculant sodium polyacrylate and polyaluminum chloride to the secondary settling...

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PUM

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Abstract

The invention relates to a method for treating polyether wastewater, and the method is mainly used for solving the problem that the polyether wastewater with high COD (Chemical Oxygen Demand) and low BOD(Chemical Oxygen Demand) / COD ratio can not achieve the discharge standard in the prior art. According to the invention, polyether-containing wastewater with BOD / COD less than or equal to 0.1 and COD more than or equal to 1500 milligrams / liter are treated through a regulating pond, a biochemical pond, an active sludge pond and a secondary sedimentation pond and then discharged, so that the COD contained in the discharged wastewater is less than or equal to 250 milligrams / liter, the SS (Suspended Substance) content is less than or equal to 250 milligrams / liter, the NH3-N content is less than or equal to 7 milligrams / liter, and the TP (Total Phosphorus) content is less than or equal to 0.5 milligrams / liter; a flocculating agent is added to the secondary sedimentation pond, and the flocculating agent is selected from at least one of an aluminum salt inorganic flocculating agent, a ferric salt inorganic flocculating agent, starch phosphate, starch xanthate, chitin, a microbe flocculating agent, polyacrylamide, sodium polyacrylate, chitosan, polyaluminium chloride, polyvinylamine or polyethylene sulphonate. The method disclosed by the invention can be used for better solving the problem and can be used for the industrial production of polyether 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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IPC IPC(8): C02F9/14C02F1/52C02F103/34
Inventor 陈凤秋徐文跃姚国青卢虎向
Owner JIANGSU CHANGHUA POLYURETHANE SCI & TECH
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