CN-121990699-A - Smelting sludge source reduction and classification treatment process and system

CN121990699ACN 121990699 ACN121990699 ACN 121990699ACN-121990699-A

Abstract

The invention belongs to the technical field of sewage treatment, and provides a smelting sludge source reduction and classification treatment process and system, wherein the process comprises the steps of pretreating sewage to obtain a first liquid phase and a first solid phase, separating the first liquid phase to obtain a second liquid phase and a second solid phase, introducing the second liquid phase into a sewage treatment device to obtain a third liquid phase and a third solid phase, discharging the third liquid phase, concentrating and dehydrating the third solid phase to obtain a fourth liquid phase and a fourth solid phase, and sequentially demulsifying and dehydrating the first solid phase and the second solid phase to obtain a fifth liquid phase and a fifth solid phase. The invention processes the sludge source, separates solid matters in the separated liquid phase for a plurality of times, collects and utilizes the finally discharged clear liquid, improves the purification efficiency of the three-mud, improves the reduction rate of the smelted sludge, and simultaneously performs drying and incineration treatment on the separated three-mud, thereby reducing pollution.

Inventors

SHAO ZHIGUO
Lv chong
WEI NING
PAN LIFANG
LIU GUANGQUAN
XU YU
ZHANG XIAOFEI
TONG KUN
NIE FAN
ZHANG MINGDONG

Assignees

中国石油天然气集团有限公司
中国石油集团安全环保技术研究院有限公司

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (10)

1. The smelting sludge source reduction and classification treatment process is characterized by comprising the following steps of: pretreating sewage to obtain a first liquid phase and a first solid phase; A separation step of separating the first liquid phase to obtain a second liquid phase and a second solid phase; the second liquid phase is communicated with a sewage treatment device to obtain a third liquid phase and a third solid phase, then the third liquid phase is discharged, and the third solid phase is subjected to concentration treatment and dehydration treatment to obtain a fourth liquid phase and a fourth solid phase; and sequentially performing demulsification treatment and dehydration treatment on the first solid phase and the second solid phase to obtain a fifth liquid phase and a fifth solid phase; collecting a fourth liquid phase and a fifth liquid phase, and returning to the separation step for treatment; Drying, burning and landfill treatment are carried out on the fourth solid phase and the fifth solid phase.
2. The process for reducing and classifying sewage sources according to claim 1, wherein the sewage is pretreated to obtain a first liquid phase and a first solid phase, and the process comprises the following steps: discharging the sewage of the crude oil tank to a sedimentation tank through an automatic water cutting device, and discharging the sewage of the electric desalting device to the sedimentation tank; separating the sewage by a sedimentation tank to obtain a first solid phase and conveying the first solid phase to a demulsification and deoiling device, and sequentially conveying the sewage separated by the sedimentation tank to a separation device to obtain a first liquid phase; The first liquid phase is transported to an oil separator.
3. The process for reducing and classifying sludge from a source according to claim 1, wherein the first liquid phase is separated to obtain a second liquid phase and a second solid phase, comprising the steps of: and the first liquid phase is sequentially introduced into an oil separation tank and an air floatation device, and a second liquid phase and a second solid phase are obtained after separation.
4. The process for reducing and classifying a source of refined sludge according to claim 1, wherein the second liquid phase is communicated with a sewage treatment apparatus to obtain a third liquid phase and a third solid phase, and the third liquid phase is discharged, comprising the steps of: introducing the second liquid phase into an anaerobic/aerobic tank for microbial treatment, and then introducing into a secondary sedimentation tank for sedimentation treatment to obtain a third liquid phase and a third solid phase; The third liquid phase is discharged.
5. The process according to claim 4, wherein the anaerobic/aerobic tank and the secondary sedimentation tank are replaced with a sequencing batch reactor.
6. The process for reducing and classifying sludge from a source according to claim 5, wherein the third solid phase is subjected to concentration and dehydration to obtain a fourth liquid phase and a fourth solid phase, comprising the steps of: Introducing the third solid phase into a concentration tank for concentration treatment, and then introducing into a centrifugal dehydrator for dehydration to obtain a fourth liquid phase and a fourth solid phase; The fourth solid phase is transported to a sludge reservoir and the fourth liquid phase is transported to a sewage tank.
7. The process for reducing and classifying a source of refined sludge as claimed in claim 6, wherein the demulsification treatment and the dehydration treatment are sequentially performed on the first solid phase and the second solid phase to obtain a fifth liquid phase and a fifth solid phase, comprising the steps of: Demulsification and oil removal treatment are carried out on the first solid phase and the second solid phase through a demulsification and oil removal device, and then the first solid phase and the second solid phase are conveyed to a dehydrator; Dewatering the demulsified and deoiled first solid phase and the second solid phase through a dewatering machine, and then conveying the obtained fifth solid phase to a sludge storage pool; and collecting a fifth liquid phase obtained by demulsification and deoiling treatment and dehydration treatment.
8. The process for reducing and classifying sludge from a source according to claim 1, wherein the fourth liquid phase and the fifth liquid phase are collected and returned to the separating step for treatment, comprising the steps of: collecting the fourth liquid phase and the fifth liquid phase into a sewage tank; and introducing the fourth liquid phase and the fifth liquid phase in the sewage tank into an oil separation tank.
9. The process for reducing and classifying a source of refined sludge according to claim 1, wherein the fourth solid phase and the fifth solid phase are dried, incinerated and landfilled, comprising the steps of: introducing the fourth solid phase and the fifth solid phase into a desiccator for desiccation; introducing the dried fourth solid phase and the dried fifth solid phase into an incinerator for incineration; And (3) transporting and burying the incinerated fourth solid phase and fifth solid phase outside.
10. A smelted sludge source reduction and classification treatment system, comprising: The pretreatment unit is used for pretreating the sewage to obtain a first liquid phase and a first solid phase; The first treatment unit is used for separating the first liquid phase to obtain a second liquid phase and a second solid phase; a second treatment unit for introducing the second liquid phase into the sewage treatment device to obtain a third liquid phase and a third solid phase, then discharging the third liquid phase, and concentrating and dehydrating the third solid phase to obtain a fourth liquid phase and a fourth solid phase; the third treatment unit is used for sequentially performing demulsification treatment and dehydration treatment on the first solid phase and the second solid phase to obtain a fifth liquid phase and a fifth solid phase; The fourth treatment unit is used for collecting a fourth liquid phase and a fifth liquid phase, and returning the fourth liquid phase and the fifth liquid phase to the first treatment unit for treatment; and the fifth treatment unit is used for drying, incinerating and burying the fourth solid phase and the fifth solid phase.

Description

Smelting sludge source reduction and classification treatment process and system Technical Field The invention belongs to the technical field of sewage treatment, and particularly relates to a smelting sludge source reduction and classification treatment process and system. Background The refining three-mud is a main solid waste in petrochemical industry, and generally comprises biochemical mud, scum of an air floatation device and bottom mud of an oil separation tank/oil storage tank. Proper disposal of the refined three-mud is a great concern in the petrochemical industry. The refining enterprises develop more production practices and scientific researches around how to properly treat the 'three-mud', and the existing oily sludge treatment technology mainly comprises a physical and chemical treatment technology, a heat treatment technology, a biological treatment technology, an oily sludge comprehensive utilization technology and the like, but the 'three-mud' treatment is a common problem in the industry, and a reliable and effective treatment method is still lacking. At present, a new mode of refinery sludge reduction and treatment needs to be constructed, so that the energy consumption and carbon emission of sludge treatment are reduced, and the reduction rate of the smelted sludge is further improved. In recent years, various oil-containing sludge treatment methods, including solvent extraction, chemical heat washing, microbiological method, incineration method and the like, are presented, but the method cannot be widely popularized and implemented due to the defects of high cost, incapability of recycling crude oil, easiness in secondary pollution and the like. Disclosure of Invention In order to solve the problems in the background technology, the invention provides a smelting sludge source reduction and classification treatment process and a system. In order to achieve the above purpose, the present invention adopts the following technical scheme: a smelting sludge source reduction and classification treatment process comprises the following steps: pretreating sewage to obtain a first liquid phase and a first solid phase; A separation step of separating the first liquid phase to obtain a second liquid phase and a second solid phase; the second liquid phase is communicated with a sewage treatment device to obtain a third liquid phase and a third solid phase, then the third liquid phase is discharged, and the third solid phase is subjected to concentration treatment and dehydration treatment to obtain a fourth liquid phase and a fourth solid phase; and sequentially performing demulsification treatment and dehydration treatment on the first solid phase and the second solid phase to obtain a fifth liquid phase and a fifth solid phase; collecting a fourth liquid phase and a fifth liquid phase, and returning to the separation step for treatment; Drying, burning and landfill treatment are carried out on the fourth solid phase and the fifth solid phase. Further, the sewage is pretreated to obtain a first liquid phase and a first solid phase, and the method comprises the following steps: discharging the sewage of the crude oil tank to a sedimentation tank through an automatic water cutting device, and discharging the sewage of the electric desalting device to the sedimentation tank; separating the sewage by a sedimentation tank to obtain a first solid phase and conveying the first solid phase to a demulsification and deoiling device, and sequentially conveying the sewage separated by the sedimentation tank to a separation device to obtain a first liquid phase; The first liquid phase is transported to an oil separator. Further, the first liquid phase is subjected to separation treatment to obtain a second liquid phase and a second solid phase, and the method comprises the following steps: and the first liquid phase is sequentially introduced into an oil separation tank and an air floatation device, and a second liquid phase and a second solid phase are obtained after separation. Further, the second liquid phase is introduced into a sewage treatment device to obtain a third liquid phase and a third solid phase, and then the third liquid phase is discharged, comprising the following steps: introducing the second liquid phase into an anaerobic/aerobic tank for microbial treatment, and then introducing into a secondary sedimentation tank for sedimentation treatment to obtain a third liquid phase and a third solid phase; The third liquid phase is discharged. Further, the anaerobic/aerobic tank and the secondary sedimentation tank are replaced by a sequencing batch active sludge tank. Further, the third solid phase is subjected to concentration treatment and dehydration treatment to obtain a fourth liquid phase and a fourth solid phase, and the method comprises the following steps: Introducing the third solid phase into a concentration tank for concentration treatment, and then introducing into a centrifugal dehydr