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PVC (Polyvinyl Chloride) mother liquor treatment method based on MBR (Membrane Bioreactor) technique

A treatment method and reactor technology are applied in the field of treating PVC mother liquor by using MBR reactor technology, which can solve the problems of high ozone unit cost, difficult degradation of organic matter, difficult production and application, etc., so as to improve the effect of biochemical treatment and reduce sludge. The effect of stable discharge and effluent water quality

Active Publication Date: 2013-03-20
HANGZHOU TIAN CHUANG ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (3) High turbidity
[0007] (5) Difficult to degrade organic matter
The cost of ozone unit is too high and it is difficult to produce and apply

Method used

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  • PVC (Polyvinyl Chloride) mother liquor treatment method based on MBR (Membrane Bioreactor) technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] According to attached figure 1 In the process shown, the PVC mother liquor of the manufacturer is used as the processing object.

[0048] First, the PVC mother liquor with a COD of 600mg / l and a PVA of 12mg / l is subjected to anaerobic reaction treatment with PVA-degrading bacteria for 10 hours. The anaerobic reaction controls the reaction temperature at 35°C and controls the dissolved oxygen at 0.1-0.2mg / l. Between; then the above-mentioned effluent through the anaerobic reaction enters the MBR reactor for aerobic treatment, and the MBR reactor contains bacillus. After treatment, the COD in the PVC mother liquor is 28mg / l, and the PVA is extremely small.

Embodiment 2

[0050] According to attached figure 1 In the process shown, the PVC mother liquor of the manufacturer is first treated, so that the COD in it is 500mg / l, the PVA is within 10mg / l, the pH is adjusted to 7-8, and the temperature is between 30-33°C. And the cultivation process of the PVA-degrading bacteria in this embodiment is: inoculate the PVC mother liquor from the digested sludge, control the dissolved oxygen 0.1-0.2mg / l, and the temperature is at 30-35°C; add glucose and phosphoric acid in the early stage of sludge acclimatization Potassium dihydrogen, then gradually reduce the glucose consumption and gradually increase the PVC mother liquor inlet and outlet water flow, when the PVA degrading bacteria make the TOC removal rate in the PVC mother liquor reach more than 30% and then use as the PVA degrading bacteria of the present embodiment, when carrying out degradation treatment, A stirrer action is required in the reactor to enhance the effect. And the preparation process...

Embodiment 3

[0054] In a method similar to Example 2, the PVC mother liquor of the manufacturer is treated first, so that the COD therein is 500 mg / l, the PVA is within 10 mg / l, the pH is adjusted to be 7-7.5, and the temperature is between 32-35 ° C. The cultivation process of PVA-degrading bacteria in this example is: inoculate PVC mother liquor from digested sludge, control dissolved oxygen 0.1-0.2mg / l, and temperature at 30-35°C; add glucose and dihydrogen phosphate in the early stage of sludge acclimatization Potassium, then gradually reduce the amount of glucose and gradually increase the flow of water in and out of the PVC mother liquor. When the PVA degrading bacteria make the TOC removal rate in the PVC mother liquor reach more than 30%, use it as the PVA degrading bacteria of the present embodiment, and select the PVA degrading bacteria as the regular shape of Brevibacterium. And the preparation process of the bacillus in the MBR reactor is: add potassium dihydrogen phosphate in ...

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Abstract

The invention discloses a wastewater biochemical treatment method, and specifically discloses a method for treating PVC (Polyvinyl Chloride) mother liquor by utilizing MBR (Membrane Bioreactor) technique. The method comprises the following sequential process schemes: carrying out anaerobic reaction treatment on the PVC mother liquor with PVA (Polyvinyl Alcohol)-containing degrading bacteria, wherein the anaerobic reaction temperature is controlled at 20-35 DEG C, the reaction time is controlled at 6-10h, and the dissolved oxygen is controlled at 0.1-0.2mg / L; degrading organic macromolecules into micromolecules so as to improve biodegradability; and then introducing anaerobic reaction effluent to the MBR for aerobic treatment so as to ultimately obtain clean water with COD (Chemical Oxygen Demand) not more than 30mg / L, wherein bacilli is contained in the MBR. The method has the advantages that treatment cost is only needed to be invested at one time, and long-term and stable treatment can be realized by expending low maintenance cost and electric cost in the following years; the longer the use time is, the lower the average treatment cost of per ton of wastewater is; and the method can be widely applied to sewage treatment enterprises.

Description

technical field [0001] The invention relates to a biochemical treatment method for waste water, in particular to a method for treating PVC mother liquor by using MBR reactor technology. technical background [0002] As a chemical raw material, PVC will produce a large amount of waste water and waste liquid in the production process, and the treatment of these waste water and waste liquid has always been an urgent problem in the industry. The characteristics of PVC centrifugal mother liquor wastewater are: [0003] (1) The amount of water is large. For every ton of PVC produced, about 3-4 tons of centrifuge mother liquor wastewater will be produced. [0004] (2) Low hardness and chlorine radicals. The process water is deionized water, and there is no link to increase the hardness of the water during the process, and its hardness and salt content are relatively low. [0005] (3) High turbidity. The mass concentration of suspended solids (SS) is 30-300 mg / L, mainly PVC par...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
Inventor 丁国良赵经纬谢柏明邱晖廖瑞阳
Owner HANGZHOU TIAN CHUANG ENVIRONMENTAL TECH
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