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Method for treating centrifuge mother liquor waste water from polychloroethylene production

A technology for centrifugal mother liquor and polyvinyl chloride, which is applied in biological water/sewage treatment, natural water treatment, sustainable biological treatment, etc., can solve the problems of high operating cost, increased operating cost, large waste water discharge, etc., and can reduce the operation cost. Costs, improved service life, and reduced emissions

Inactive Publication Date: 2010-10-27
天津威德泰科石化科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The methods commonly used now are: 1. Filtration membrane separation method, but the PVA colloid blocks the filter holes, and the filter membrane cannot be backwashed and regenerated; 2. Advanced oxidation method or the combined process of advanced oxidation method and biochemical method, which requires large investment and operating costs High, and there is still a considerable distance from the actual application of the manufacturer; 3. Biological method (contact oxidation method), PVC centrifuge mother liquor wastewater can basically achieve standard discharge after being treated by this method, but due to the increase in construction investment of wastewater treatment system, The discharge of wastewater is large, and the operating cost is greatly increased

Method used

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  • Method for treating centrifuge mother liquor waste water from polychloroethylene production
  • Method for treating centrifuge mother liquor waste water from polychloroethylene production
  • Method for treating centrifuge mother liquor waste water from polychloroethylene production

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: see figure 2 , shown in the figure is the flowchart of the first embodiment of the PVC centrifugal mother liquor wastewater treatment process of the present invention. PVC centrifugal mother liquid wastewater enters the plate heat exchanger, after the temperature of the wastewater drops from 85°C to 40°C, it enters the adjustment tank (400-500m3), and is mixed homogeneously in the adjustment tank, and the hydraulic retention time is 1-5 hours. The wastewater in the adjustment tank is pumped into the aeration tank for aerobic reaction, and a certain amount of nutrient salt is added to the aeration tank, urea and sodium phosphate are added according to the ratio of COD:N:P=100:1:0.3), so that The easily degradable organic matter in the wastewater is degraded by biological bacteria, and the hydraulic retention time is 12-36 hours. After the degradation, the wastewater flows into the coagulation air flotation system by itself. Add the coagulant polyaluminum ...

Embodiment 2

[0025] Example 2: see image 3 , shown in the figure is the flow chart of the second embodiment of the PVC centrifugal mother liquor wastewater treatment process of the present invention. PVC centrifugal mother liquid wastewater enters the cooling tower, after the temperature of the wastewater drops from 85°C to 30°C, it enters the regulating tank (400-500m3), and is mixed homogeneously in the regulating pool, and the hydraulic retention time is 1-5 hours. The wastewater in the adjustment tank is pumped into the aeration tank for aerobic reaction, and a certain amount of nutrient salt is added to the aeration tank, and urea and phosphoric acid are added according to the ratio of COD:N:P=100:2:0.1), so that the wastewater The easily degradable organic matter in the water is degraded by biological bacteria, and the hydraulic retention time is 12-36 hours. After that, the degraded waste water flows into the coagulation air flotation system by itself. Add the coagulant polyalumin...

Embodiment 3

[0027] Embodiment 3: see Figure 4 , shown in the figure is the flow chart of the third embodiment of the PVC centrifugal mother liquor wastewater treatment process of the present invention. PVC centrifugal mother liquid wastewater enters the cooling tower, after the temperature of the wastewater drops from 85°C to 15°C, it enters the regulating tank (400-500m3), and is mixed homogeneously in the regulating pool, and the hydraulic retention time is 1-5 hours. The wastewater in the adjustment tank is pumped into the aeration tank for aerobic reaction, and a certain amount of nutrient salt is added to the aeration tank. Urea and phosphoric acid are added according to the ratio of COD:N:P=100:3:0.4, so that the waste water The easily degradable organic matter is degraded by biological bacteria, and the hydraulic retention time is 12-36 hours. After the degradation, the waste water flows into the coagulation air flotation system by itself. Add 1g of coagulant polyacrylamide to th...

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Abstract

The invention relates to a centrifugal mother liquor wastewater treatment method during the production of polyvinyl chloride. The method comprises the following steps: (1) reducing the temperature of the PVC centrifugal mother liquor wastewater to 15 to 40 DEG C through a cooling device; (2) sending the cooled wastewater into an aeration tank for the aerobic reaction, and supplementing nutritive salt into the aeration tank, wherein adding carbamide and phosphoric acid or phosphates according to the proportion of COD: N: P as100:1-3: 0.1-0.4; (3) leading the wastewater after the aerobic treatment into a coagulation tank, and adding a coagulant into the coagulation tank; (4) leading the supernatant of the coagulation tank into an absorption tower through a filter, and removing organic pollutant residues in the wastewater through an absorbent; and (5) making the outputted clear liquid of the absorption tower reach the reclamation standards. The process of 'aerobiosis + coagulation + absorption' improves the service life of the absorbent without blockage and simultaneously reduces the operation cost. The process produces a small amount of wastewater, emits a tiny amount of wastewater,and reclaims more than 90 percent of wastewater.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a treatment method for centrifuged mother liquid wastewater in polyvinyl chloride production. Background technique [0002] PVC centrifuge mother liquor wastewater contains VCM monomer and a small amount of residual additives, as well as PVC fine particles and refractory organic matter. If discharged directly, it will cause serious harm to the environment. Therefore, it must be treated effectively to meet the relevant national discharge requirements. Standards, and meet the water quality standards for PVC polymerization process water. The methods commonly used now are: 1. Filtration membrane separation method, but the PVA colloid blocks the filter holes, and the filter membrane cannot be backwashed and regenerated; 2. Advanced oxidation method or the combined process of advanced oxidation method and biochemical method, which requires large investment and operating costs High, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F3/12C02F1/52C02F1/28C02F103/38
CPCY02W10/10
Inventor 叶明周恩民
Owner 天津威德泰科石化科技发展有限公司