Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Treatment recycling system and treatment recycling method for sewage in ethylene plant

A sewage treatment and sewage technology, which is applied in the field of sewage treatment and reuse system in ethylene plants, can solve the problems that sewage cannot meet the national first-level discharge standard stably, the sewage reuse rate is not ideal, and the investment in sewage reuse is large. The effect of reducing the amount of difficult-to-treat sewage, occupying a large area, and lowering operating costs

Active Publication Date: 2014-08-20
CHINA PETROLEUM & CHEM CORP +1
View PDF3 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Treatment recycling system and treatment recycling method for sewage in ethylene plant
  • Treatment recycling system and treatment recycling method for sewage in ethylene plant
  • Treatment recycling system and treatment recycling method for sewage in ethylene plant

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 less than 60mg / L, and the water quality reaches the national environmental first-class discharge standard; among them, after the first BAF treatment, the B / C of the sewage is less than 0.3, and the COD is less than 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 ...

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-class 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 mixed COD is less than 2000mg / L. 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 meets 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 After the wastewater is treated by the sewage treatment system of Comparative Example 3, it is treated with the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
chemical oxygen demand (mass)aaaaaaaaaa
chemical oxygen demand (mass)aaaaaaaaaa
Login to View More

Abstract

The invention provides a treatment recycling system and a treatment recycling method for sewage in an ethylene plant. The method comprises the following steps of: (1) performing wet-type oxidization treatment on alkali dreg waste water, mixing the alkali dreg waste water with circulation cooling water disposal sewerage, and treating the mixed sewage sequentially by an aerated biological filter tank and a high-level oxidization and aerated biological filter tank to be mixed with acid-base waste water and then drain the waste water; and (2) mixing low-salt waste water, sequentially treating the waste water by oil removal, gas flotation, biochemistry and aerated biological filter tank for sterilizing and filtering; and recycling and applying the waste water to a circulation cooling water system. With the adoption of the system and the method, the recycling rate of the sewage in the ethylene plant can be greatly improved, the investment and operation costs are lower and the technology is reliable; and moreover, the system and the method are simple and convenient to operate and manage.

Description

technical field [0001] The invention relates to a treatment and reuse system and a treatment and reuse method for sewage from an ethylene plant. 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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/72
Inventor 李本高傅晓萍秦冰余正齐王金华李亚红
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com