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A process method for treating refinery wastewater combined with biological aerated filter

An aerated biological filter, refining and chemical sewage technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the impact of biochemical section, abnormal sewage treatment system, etc. Water quality instability and other problems, to achieve the effect of increasing the treatment depth and avoiding the impact of water quality

Active Publication Date: 2017-12-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wastewater produced by refining heavy crude oil has complex components and unstable water quality. The sewage treatment plant is often impacted by the water quality, resulting in abnormal sewage treatment system and substandard water quality.
[0003] Because the sewage generated from heavy crude oil refining (referred to as heavy oil refining sewage) contains a large amount of naphthenic acid and other organic pollutants that are difficult to degrade biochemically, the COD can be as high as 2000-3000mg / L, and the traditional biochemical process is difficult to meet the standard.
At the same time, when the conventional refinery sewage process "oil separation + two-stage air flotation + aerated biological tank + secondary sedimentation tank" is used to treat inferior heavy oil refinery sewage, the physical and chemical section of "oil separation + two-stage air flotation" is difficult to meet the oil-water separation conditions, the pollutant load in the effluent of the physical and chemical section is extremely high, causing an impact on the biochemical section, resulting in the death of a large number of microorganisms, and the effluent of the biochemical section seriously exceeds the standard

Method used

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  • A process method for treating refinery wastewater combined with biological aerated filter
  • A process method for treating refinery wastewater combined with biological aerated filter
  • A process method for treating refinery wastewater combined with biological aerated filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] According to the above process to treat the sewage of a refinery, the process conditions of the main treatment unit are as follows:

[0083] The BAF filler in the internal circulation is anthracite, the filtration rate is 3m / h, the gas-water ratio is 3:1, the internal circulation ratio is 150%, and the backwash cycle is 48h;

[0084] The residence time of the sludge bed is 1.0h, the sludge concentration in the sludge bed is 10g / L, and the sludge return rate is 20%;

[0085] The COD volume load of the A / O pool is 0.8kg COD / m 3 d, the residence time is 12 / 48h, the internal reflux ratio is 300%, the sludge reflux ratio is 80%, the sludge concentration is 4g / L, and the aeration intensity is 8m 3 / m 2 h;

[0086] The catalyst used in the ozone catalytic oxidation system is modified ceramsite carrier loaded with 3.0% cerium element, the dosage of ozone is 40mg / L, and the oxidation time is 30min;

[0087] The upflow BAF adopts ceramsite filler, the filtration rate is 5m / h,...

Embodiment 2

[0091] According to the above process, the saline sewage of a refinery is treated, and the process conditions of the main treatment units are as follows:

[0092] The BAF filler in the internal circulation is medical stone, the filtration rate is 2m / h, the air-water ratio is 3:1, the internal circulation ratio is 150%, and the backwash cycle is 36h;

[0093] The residence time of the sludge bed is 1.5h, the sludge concentration in the sludge bed is 13g / L, and the sludge return rate is 20%;

[0094] The COD volume load of the A / O pool is 1.2kg COD / m 3 d, the residence time is 16 / 56h, the internal reflux ratio is 300%, the sludge reflux ratio is 80%, the sludge concentration is 5g / L, and the aeration intensity is 10m 3 / m 2 h;

[0095] The catalyst used in the ozone catalytic oxidation system is a modified columnar activated carbon carrier loaded with 3.0% copper and 2.0% cerium element, the dosage of ozone is 50mg / L, and the oxidation time is 30min;

[0096] The upflow BAF ...

Embodiment 3

[0100] According to the above process, the saline sewage of a refinery is treated, and the process conditions of the main treatment units are as follows:

[0101] The BAF filler in the internal circulation is fiber balls, the filtration rate is 5m / h, the air-water ratio is 3:1, the internal circulation ratio is 150%, and the backwash cycle is 48h;

[0102] The residence time of the sludge bed is 1.5h, the sludge concentration in the sludge bed is 10g / L, and the sludge return rate is 10%;

[0103] The COD volume load of the A / O pool is 1.0kg COD / m 3 d, the residence time is 14 / 48h, the internal reflux ratio is 300%, the sludge reflux ratio is 90%, the sludge concentration is 5g / L, and the aeration intensity is 10m 3 / m 2 h;

[0104] The catalyst used in the ozone catalytic oxidation system is a modified alumina carrier loaded with 3.0% manganese and 3.0% copper, the ozone dosage is 40mg / L, and the oxidation time is 50min;

[0105] The upflow BAF adopts anthracite filler, the ...

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Abstract

The present invention relates to the technical field of industrial water treatment, and specifically relates to a process method for treating refinery sewage in combination with a biological aerated filter. The specific steps are: step 1, homogeneous adjustment; step 2, oil separation and air flotation; Circulating BAF; step 4, sludge bed adsorption; step 5, A / O + sedimentation system; step 6, ozone catalytic oxidation; step 7, upflow BAF; the final treated sewage meets the discharge standard for discharge. The process of treating refinery sewage in combination with the biological aerated filter of the present invention fully utilizes the characteristics of the BAF device, which can avoid the impact of water quality in the activated sludge tank and increase the treatment depth of sewage, which can be used for low-quality sewage , especially in the treatment of heavy crude oil refinery wastewater.

Description

technical field [0001] The invention relates to the technical field of industrial water treatment, in particular to a process method for treating refinery sewage in combination with an aerated biological filter. The refining sewage is heavy oil (heavy crude oil) refining sewage (oil refining sewage) with high COD and high salt. Background technique [0002] Due to the shortage of oil resources, more and more domestic refineries need to produce and process heavy crude oil. The wastewater produced by refining heavy crude oil has complex components and unstable water quality. The sewage treatment plant is often impacted by the water quality, resulting in abnormal sewage treatment system and substandard water quality. [0003] Since the sewage generated from heavy crude oil refining (referred to as heavy oil refining sewage) contains a large amount of organic pollutants such as naphthenic acid that are difficult to degrade biochemically, the COD can be as high as 2000-3000mg / L,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 邱小云刘正赵辉龚小芝童健崑
Owner CHINA PETROLEUM & CHEM CORP
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