Treatment method for wastewater of polyvinyl chloride (PVC) anticentripetal mother solution

A technology of polyvinyl chloride and centrifugal mother liquor, applied in ion exchange water/sewage treatment, biological water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problems of difficult biodegradability, difficult production and application, high turbidity, etc. Achieving obvious benefits and increasing benefits

Active Publication Date: 2009-01-14
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] (3) High turbidity
[0007] (5) Difficult to degrade organic matter
These substances are toxic and poorly biodegradable
[0008] (6) High temperature
The cost of ozone unit is too high and it is difficult to produce and apply

Method used

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  • Treatment method for wastewater of polyvinyl chloride (PVC) anticentripetal mother solution

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Embodiment Construction

[0037] Refer to attached picture. The recovery process of PVC centrifugal mother liquor waste water provided by the present invention, it comprises the following processing steps successively to the processing of PVC centrifugal mother liquor waste water:

[0038] 1) Use the self-cleaning filter to treat PVC centrifuge mother liquor wastewater, and effectively recover the PVC pellets from the backwash liquid of the self-cleaning filter, and return the recycled PVC pellets to the centrifuge of the original production line. The equipment can be equipped with an enhanced cleaning device, and if necessary, a super strong backwash can be performed on the system to ensure that the filter can fully recover its performance. Regardless of the turbidity of the incoming water, the turbidity of the self-cleaning filter outlet water should be kept below 20NTU, which will have a good guarantee for the subsequent system.

[0039] The backwash liquid is combined with the mother liquor wastew...

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Abstract

The invention provides a treatment method of polyvinyl chloride (PVC) centrifugal mother liquor wastewater, sequentially comprising the following treatment steps of: 1) treatment by a self-cleaning strainer, and recovering PVC particles of backwash liquor of the self-cleaning strainer, 2) decreasing temperature treatment, 3) coagulating sedimentation treatment, 4) ozone oxidation, 5) treatment by a biological aerated filter, 6) ultra-filtration treatment, 7) reverse osmosis treatment, and 8) ion exchange treatment. The treatment method realizes the comprehensive treatment to the mother liquor through sequential treatment to the mother liquor, and can realize the high quality recovery to the PVC mother liquor, thereby effectively controlling treatment costs, improving treatment effects, reducing the discharge of COD and quantity of water intake in factories to a great extent, and effectively increasing benefits of PVC manufacturing enterprises.

Description

technical field [0001] The invention relates to a treatment method for polyvinyl chloride (PVC) centrifugal mother liquor. Background technique [0002] Since the PVC mother liquid water contains refractory organic substances such as initiators, dispersants, and terminators added during the polymerization process, the treatment is very difficult. 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 generated. [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 particles. [0006] (4) The concentration of organic matter is low. CODcr is generally 100-40...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/52C02F1/78C02F3/12C02F1/44C02F1/42
CPCY02W10/10
Inventor 谭永文谢柏明于德胜姜丽彩陈栋楼亚男陈丽丽冯小良
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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