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Treatment and Reuse Method of Sewage from Oil Refining-Ethylene Combined Unit

A technology of combined device and mixed sewage, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, natural water treatment, etc. Unsatisfactory, large investment in sewage reuse, etc., to achieve the effect of reducing the amount of difficult-to-treat sewage, covering a large area, and low operating costs

Active Publication Date: 2015-07-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most ethylene plants still use the "old three sets" process consisting of oil separation, air flotation and biochemical treatment of mixed sewage. Due to the impact of high-concentration sewage on the biochemical system, the sewage treated with the "old three sets" process is still not enough Stably meet the national first-level emission standards, let alone reuse
Some enterprises have advanced treatment of sewage, which can realize partial reuse of sewage, but the reuse rate of sewage is not ideal, and the investment of sewage reuse is large, the operation cost is high, and there is no economic benefit
Some oil refining enterprises have adopted the measures of "cleaning and diverting sewage, separating and treating sewage", so that high and low concentration wastewater can be treated separately. The overall treatment effect is good, but the sewage reuse rate is still low

Method used

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  • Treatment and Reuse Method of Sewage from Oil Refining-Ethylene Combined Unit
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  • Treatment and Reuse Method of Sewage from Oil Refining-Ethylene Combined Unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The conditions of the ethylene production unit and various sewage are the same as those of Comparative Example 1.

[0057] Such as figure 2 As shown, the alkali slag wastewater, acid-base wastewater and part of the circulating cooling water sewage are cut out from the wastewater treatment system; 120,000 m 3 / a of alkali slag wastewater after wet oxidation treatment, and 800,000 m 3 / a of circulating cooling water and sewage mixed, the mixed COD3 / a acid-alkali wastewater is mixed and discharged, the COD of the discharged sewage is <60mg / L, and the water quality reaches the national environmental first-level discharge standard; among them, after the first BAF treatment, the B / C of the sewage is <0.3, and the COD<200mg / L L.

[0058] 9.38 million m3 with salt content less than 500mg / L 3 / a waste water and 1.4 million m 3 / a The sewage from the circulating cooling water system is mixed. After being treated by the sewage treatment system in Comparative Example 1, the B...

Embodiment 2

[0063] The situation of the production device and various sewage is the same as that of Comparative Example 2.

[0064] Such as Figure 4 As shown, the oil refining alkali residue wastewater, ethylene alkali residue wastewater, acid-base wastewater and part of the circulating cooling water sewage are cut out from the wastewater treatment system, and the 14,000 m3 treated by "wet oxidation + SBR" 3 / a Refinery alkali slag wastewater, 86,000 m of wet oxidation treatment 3 / a Ethylene alkali slag wastewater and 1.5 million m3 of salt containing 1800mg / L 3 / a The sewage from the circulating cooling water system is combined and treated with the "BAF + catalytic oxidation + BAF" process, and the effluent is then combined with 430,000 m 3 / a The acid-base wastewater is combined and discharged, the COD of the discharged sewage is less than 60mg / L, and the water quality reaches the national environmental first-level discharge standard; among them, after the first BAF treatment, the B...

Embodiment 3

[0070] The conditions of the ethylene production unit and various sewage are the same as those of Comparative Example 3.

[0071] Such as Figure 6 As shown, the alkali slag wastewater, acid-base wastewater and part of the circulating cooling water sewage are cut out from the wastewater treatment system; 45,000 m 3 / a Alkaline slag waste water after wet oxidation treatment, with 800,000 m 3 / a The sewage from the circulating cooling water system is mixed, and the COD after mixing is 3 / a The acid-base wastewater is mixed and discharged, the COD of the discharged sewage is less than 60mg / L, and the water quality reaches the national environmental first-level discharge standard; among them, after the first BAF treatment, the B / C of the sewage is 0.1-0.4, and the COD is less than 200mg / L.

[0072] 2.545 million m with salt content less than 500mg / L 3 / a Waste water is treated by the sewage treatment system of Comparative Example 3, and then treated with BAF process. The salt ...

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Abstract

The invention relates to a method for treating and recycling sewage of an integrated oil-ethylene refining device. The method for treating and recycling the sewage of the integrated oil-ethylene refining device comprises the following steps: (1) sequentially carrying out wet oxidation and SBR (sequencing batch reactor) treatment on oil refining caustic sludge waste water; (2) mixing ethylene caustic sludge waste water with circulating cooling water, sewage and waste water obtained through treatment in the step (1) after the wet oxidation treatment is carried out, sequentially treating the mixed sewage by virtue of a biological aerated filter and an advanced oxidation and biological aerated filter, mixing the treated mixed sewage with acid-alkali wastewater, and discharging; and (3) mixing with waste water with salt content less than or equal to 500mg / L, sequentially treating the mixed waste water by virtue of an oil removal tank, an air floatation tank, a biochemical tank and a biological aerated filter, sterilizing and filtering, and then recycling the treated waste water in a recirculating cooling water system. The method for treating and recycling the sewage of the integrated oil-ethylene refining device has the advantages that reuse rate of the sewage can be greatly increased, investment and running cost are low, and operation management is simple.

Description

technical field [0001] The invention relates to a treatment and reuse method for sewage of an oil refinery-ethylene combined unit. Background technique [0002] my country is a country with a shortage of water resources. The per capita water resources are about 2,200 cubic meters, which is only a quarter of the world average. At the same time, due to the growth of our country's population, the water demand has approached the amount of water resources that can be developed and utilized. [0003] The petrochemical industry is one of the five high water consumption industries in my country, among which the water consumption of ethylene production is particularly prominent. A production plant with an annual output of 1 million tons of ethylene needs to draw about 18.5 million tons of water per year, and at the same time discharge sewage about 12 million tons per year. year. Huge water consumption not only restricts the development of my country's ethylene industry, but also is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F103/34
Inventor 李本高傅晓萍秦冰余正齐王金华李亚红
Owner CHINA PETROLEUM & CHEM CORP
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