Method for treating and recycling circulating water and sewage

A sewage and circulating water technology, applied in the direction of neutralized water/sewage treatment, oxidized water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of treatment and reuse that have not been reported in the literature, and achieve Low cost, low investment cost, and the effect of reducing COD

Active Publication Date: 2011-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned documents mainly focus on the treatment and reuse of circulating water sewage produced by using fresh water as the supplementary water of circulating water, while the treatment of the sewage of circulating water produced by using external sewage as supplementary water for circulating water does not There is no literature report on recycling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Treatment of circulating water effluent from a refinery. The operating conditions of catalytic oxidation and flocculation are determined as follows: the influent pH value is 5, the dosage of catalyst ferrous sulfate is 300mg / L, the dosage of sodium hypochlorite is 80mg / L, the residence time of wastewater in the reactor is 40 minutes, and the flocculation tank The pH of the waste water in the medium is 7, and the residence time is 30 minutes. The membrane treatment system adopts "nanofiltration + reverse osmosis". The water quality indicators of sewage before and after treatment are shown in Table 1. It can be seen from the data in Table 1 that after the sewage is treated, the main indicators meet the water quality requirements for recycled water reuse.

[0028] Table 1 Treated sewage water quality data 1

[0029] index

Embodiment 2

[0031] Treatment of circulating water effluent from a chemical plant. The operating conditions of catalytic oxidation and flocculation are determined as follows: the influent pH value is 4, the dosage of catalyst ferrous sulfate is 250mg / L, the dosage of sodium hypochlorite is 60mg / L, the residence time of wastewater in the reactor is 50 minutes, and the flocculation tank The pH of the waste water in the medium is 7.5, and the residence time is 20 minutes. The membrane treatment system adopts "nanofiltration + reverse osmosis". The water quality indicators of sewage before and after treatment are shown in Table 2. It can be seen from the data in Table 2 that after the sewage is treated, the main indicators meet the water quality requirements for recycled water reuse.

[0032] Table 2 Treated sewage water quality data 2

[0033] index

Embodiment 3

[0035] Treatment of circulating water sewage from a power plant. The operating conditions of catalytic oxidation and flocculation are determined as follows: the influent pH value is 5, the dosage of catalyst ferrous sulfate is 200 mg / L, and the H 2 o 2 The dosage is 50 mg / L, the residence time of the wastewater in the reactor is 45 minutes, the pH of the wastewater in the flocculation tank is 7, and the residence time is 20 minutes. The membrane treatment system adopts "ultrafiltration + reverse osmosis". The water quality indicators of sewage before and after treatment are shown in Table 3. It can be seen from the data in Table 3 that after the sewage is treated, the main indicators meet the water quality requirements for recycled water reuse.

[0036] Table 3 Treated sewage water quality data 3

[0037] index

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PUM

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Abstract

The invention relates to a method for treating and recycling circulating water and sewage, which comprises the following steps of: adding an oxidative bactericide and a catalyst into the sewage for chemical reaction, performing flocculation precipitation on reacted wastewater, adding wastewater subjected to flocculation precipitation into a membrane system for treating, and recycling recycled water subjected to membrane treatment to a circulating water system. Compared with the prior art, the method can effectively reduce the chemical oxygen demand (COD) of the wastewater, can reduce the content of bacteria in the wastewater, and meets the requirement of recycling the treated wastewater to the circulating water system.

Description

technical field [0001] The invention relates to a method for treating and reusing sewage, in particular to a method for treating and reusing sewage of circulating water produced by using externally discharged sewage as supplementary water for circulating water. Background technique [0002] The shortage of water resources and the continuous deterioration of the water environment have made water saving and emission reduction more and more important. The sewage discharged from industrial enterprises is reused in the circulating water system as supplementary water after advanced treatment, which is the most commonly used effective water saving and emission reduction measure. , the COD and total dissolved solids (TDS) of the sewage are much higher than when fresh water is used as supplementary water. At present, many enterprises send this kind of wastewater back to the sewage treatment plant for treatment and reuse. This not only increases the load of the sewage treatment plant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/72C02F1/76C02F1/78C02F1/50C02F1/52C02F1/44C02F1/66
Inventor 高峰张莉马欣
Owner CHINA PETROLEUM & CHEM CORP
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