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Ground Comprehensive Treatment Process of Heavy Oil Sewage

A technology for comprehensive treatment of heavy oil sewage, applied in water/sewage treatment, multi-stage water/sewage treatment, biological water/sewage treatment, etc. Achieve the effect of strong practicability, efficient processing and high efficiency

Active Publication Date: 2021-09-17
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On offshore platforms or other places, heavy oily sewage is generally discharged directly to the sea or to the surrounding environment after certain treatment, and allowing heavy oily sewage to be directly discharged outside will lead to serious pollution of the environment
[0003] At present, most of the heavy oil sewage in the market is reinjected after general treatment, and the water quality of the reinjection water is often not up to standard, and there is little involvement in the way of careful treatment and direct discharge. However, the current treatment mode not only affects the subsequent oil recovery process, but also and cannot solve the fundamental problem

Method used

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  • Ground Comprehensive Treatment Process of Heavy Oil Sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment one discharge treatment

[0034] The heavy oil sewage wastewater with a COD content of 11000mg / L, a suspended matter content of 380mg / L, and a petroleum content of 460mg / L is sequentially passed through the hydrocyclone 1, the chemical-dosed dissolved air flotation and the electric flocculation air flotation tank 4 to separate the thick Coarse silt, large SS, small SS, slick oil, dispersed oil and emulsified oil in oily sewage are removed. At this time, the COD content is reduced to 8700mg / L, the suspended solid content is reduced to 93mg / L, and the petroleum content is 52mg / L. L;

[0035] Impurities such as suspended solids are further removed through the primary filter tank 5 filled with quartz sand and anthracite, and the effluent is passed into the advanced oxidation system composed of the micro-electrolysis coupled hydrogen peroxide tank 6 and the first three-dimensional electrochemical tank 7 , to remove most of the organic pollutants and ammonia nitro...

Embodiment 2

[0037] Embodiment 2 Discharge treatment

[0038] The heavy oil sewage wastewater with a COD content of 5000mg / L, a suspended solids content of 230mg / L, and a petroleum content of 350mg / L is passed through the hydrocyclone 1, the dosing dissolved air flotation and the electroflocculation air flotation tank 4 in sequence, and the Coarse silt, large SS, small SS, slick oil, dispersed oil and emulsified oil are removed from the heavy oily sewage. At this time, the COD content is reduced to 4200mg / L, the suspended solid content is reduced to 65mg / L, and the petroleum content is 31mg. / L;

[0039] Impurities such as suspended solids are further removed through the primary filter tank 5 filled with quartz sand and anthracite, and the effluent is passed into the advanced oxidation system composed of the micro-electrolysis coupled hydrogen peroxide tank 6 and the first three-dimensional electrochemical tank 7 , to remove most of the organic pollutants and ammonia nitrogen and other su...

Embodiment 3

[0041] Embodiment 3 Reinjection processing

[0042]The heavy oil sewage wastewater with a COD content of 11000mg / L, a suspended solid content of 380mg / L, and a petroleum content of 460mg / L is sequentially passed through inclined plate oil separation sedimentation, drug-dosed dissolved air flotation, and electroflocculation air flotation tank 4. Coarse silt, large SS, small SS, slick oil, dispersed oil and emulsified oil in the oily sewage are removed. At this time, the COD content is reduced to 8570mg / L, the suspended solid content is reduced to 87mg / L, and the petroleum content is 49mg / L. L;

[0043] Impurities such as suspended solids are further removed through the primary filter tank 5 filled with quartz sand and anthracite, and its effluent is passed into the second three-dimensional electrochemical cell 8 to remove most of the organic pollutants and ammonia nitrogen. At this time, the COD content is reduced. to 2830mg / L, the content of suspended solids is reduced to 78m...

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Abstract

The ground comprehensive treatment process for heavy oily sewage includes the following steps: S1, treating heavy oily sewage through a hydrocyclone or inclined plate oil-separating sedimentation tank; First-stage filter tank treatment; S3, the heavy oil sewage from the hydrocyclone treated in step S3 flows into the micro-electrolysis coupling hydrogen peroxide pool and the first three-dimensional electrochemical pool in turn, or the sewage from the inclined plate treated in step S3 The heavy oily sewage in the oil separation sedimentation tank flows into the second three-dimensional electrochemical cell; S4, the heavy oily sewage treated in step S3 flows into the secondary filter pool; S5, the heavy oily sewage from the hydrocyclone treated in step S4 After passing through the A / O‑MBR biochemical system pool, it is discharged, or the heavy oily sewage from the inclined plate oil separation sedimentation tank treated in step S4 is sequentially passed through the microfiltration membrane pool and the ultraviolet sterilization pool before reinjection. Its advantages: the two treatment routes of discharge and reinjection can be realized by one set of process for heavy oil sewage, and different treatment standards can be achieved, and the process of process treatment is efficient.

Description

technical field [0001] The invention relates to a sewage treatment process, in particular to a ground comprehensive treatment process for heavy oil sewage. Background technique [0002] The water quality of heavy oil sewage is more complex, not only polluted by crude oil, but also dissolved various salts and gases in the formation in the high temperature and high pressure oil layer; in the process of oil recovery, a lot of suspended solids are carried from the oil layer; Various chemicals are also mixed in during the transportation process; heavy oil sewage also contains a large amount of dissolved organic matter. In short, heavy oil sewage is a kind of sewage with complex water quality. In many parts of the world, heavy oil sewage is reused in thermal recovery boilers or reinjected into formations after certain treatment. On offshore platforms or other places, heavy oily sewage is generally discharged directly to the sea or to the surrounding environment after certain tre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F103/10
CPCC02F1/001C02F1/24C02F1/32C02F1/38C02F1/40C02F1/444C02F1/46C02F1/461C02F1/463C02F1/465C02F1/722C02F3/1205C02F3/30C02F9/00C02F2001/007C02F2103/10
Inventor 戴捷兰天翔胡耀笛刘君臣周伟强
Owner YANGTZE UNIVERSITY