Treatment process for oil-contained sludge generated by oilfield wastewater treatment

A treatment process and technology for oilfield sewage, applied in water/sludge/sewage treatment, sludge treatment, mining wastewater treatment, etc., can solve the problems of difficult cleaning of filter cloth, increased processing difficulty, and influence on water evaporation, etc., to achieve Promote oxidation degradation, increase migration space, and increase sludge density

Active Publication Date: 2016-06-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the treatment technology of oil sludge containing polymer is currently a difficult point. At the same time, the existing reduction technology has not realized the recovery of crude oil in oil sludge. The further evaporation of water is prevented, and the reduction of sludge cannot be further realized
In addition, when the polymer-containing oil sludge is harmlessly treated, such as using microbial degradation, etc., the crude oil in the oil sludge will not be effectively degraded due to the consumption of a large number of microorganisms on the degraded polymer.
[0005] Research data show that the dehydration effect of the filter press is slightly better than that of the centrifuge, but it is disabled due to the limitation of timeliness and labor intensity.
The main reason is that the existing technology does not recover oil resources or process the crude oil in the oil sludge when conditioning the oil sludge. The viscous colloid, asphaltene and other heavy components in the crude oil are easy to stick to the mesh of the filter cloth. It takes a lot of manpower and energy to clean up before it can be used, which affects the timeliness of sludge treatment, thus limiting the popularization and application of filter press equipment
All in all, the current oil sludge reduction technology, firstly, does not carry out crude oil recovery treatment, which affects the centrifugal dehydration effect, and the dehydrated oil sludge contains polymer oil sludge, which makes the treatment more difficult; secondly, the oil sludge treated with the existing conditioner It is limited to the use of centrifugal facilities to reduce the volume, and the filter press with better dehydration effect is difficult to clean the filter cloth due to the viscosity of crude oil in the sludge, which limits the application of oilfield filter press
[0006] At present, there is still no good solution for the further treatment of oily sludge generated from oilfield sewage treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Take 3 parts of sludge at the bottom of the sewage settling tank at the 81# station of the No. 2 Oil Production Plant of Xinjiang Oilfield, and place them in three measuring cylinders numbered ①, ②, and ③ respectively. The pH value of the sludge is 7.5-8.5, and the average solid phase content is 15.4%, the average density of sludge is 1.042g / cm 3 .

[0037] ① The amount of oil sludge is 102ml;

[0038] ② The amount of oil sludge is 100ml; add 2ml hydrochloric acid;

[0039] ③ The amount of oil sludge is 100ml, add 1ml hydrochloric acid;

[0040] The above 3 samples were tested for pH value, and the test results are shown in Table 1:

[0041] Table 1:

[0042] Sample serial number

①

②

③

Sludge volume before treatment / ml

102

100

100

Add industrial hydrochloric acid volume / ml

0

2

1

[0043] pH value of sludge after adding acid

8

6

7

[0044] Then add HRS composite plugging ...

Embodiment 2

[0069]In order to test whether the mass concentration range of the 0.5-2% oxidizing agent mentioned above can realize the reduction of the above-mentioned oily sludge when the added volume of the acid solution is less than 1%. The inventor further added 0.5%, 2% and 4% to the oily sludge in Example 2 of 100ml after adding 0.5ml of industrial hydrochloric acid (the pH value of the oily sludge after adding acid was 7) for acidification and deoiling treatment. % oil sludge quality HRS composite plugging remover oily sludge treatment results were tested, the specific experimental results are shown in Table 6:

[0070] Table 6:

[0071] Sample serial number

[0072] It can be seen from Table 6 that when the volume of the added acid is 0.5%, the 0.5% HRS composite plugging remover can also significantly improve the settling performance of the oil sludge. Far greater than the 7.3% volume ratio of the liquid phase to the solid phase of No. ① sample in Table 3 obtained by n...

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Abstract

The invention discloses a treatment process for oil-contained sludge generated by oilfield wastewater treatment. The treatment process comprises the following steps: subjecting the oil-contained sludge to acidification deoiling treatment so as to obtain oil-reduced sludge; and subjecting the oil-reduced sludge to oxidation degradation treatment so as to obtain quantity-reduced oily sludge. The treatment process provided by the invention adjusts the oil-contained sludge in a range of neutral to weak acidity by utilizing acid, so a part of acid soluble inorganic matters in the oil-contained sludge is dissolved and corroded, and more importantly, crude oil adsorbed on clay can be desorbed and separated; thus, the purposes of recovering oil resources and improving oily sludge density can be easily achieved. Meanwhile, the treatment process provided by the invention can relieve cross-linking and adsorption states of high-molecular polymers, promotes oxidation degradation of polymers, facilitates to increasing migration space of free-state water molecules in the oily sludge, is favorable for solid-liquid separation of the oily sludge, and reduces energy consumption of centrifugal dehydration, thereby improving settleability of a solid phase in the oil-contained sludge and facilitating to realizing quantity reduction and even harmless discharge of sludge.

Description

technical field [0001] The invention relates to the field of oily sludge treatment, in particular to a process for treating oily sludge produced in oil field sewage treatment. Background technique [0002] The oily sludge is huge in volume. If it is discharged directly without treatment, it will not only occupy a large amount of cultivated land, but also pollute the surrounding soil, water, and air, accompanied by the generation of foul-smelling gases. The traditional treatment methods mainly include landfill, composting, incineration and biological transformation, and there is no specific and effective treatment method according to the source characteristics of oily sludge. Landfilling and composting need to occupy a large amount of valuable land resources, and at the same time there is a danger of oil and gas emission polluting the atmosphere and soil seepage polluting groundwater. Incineration needs to consume a certain amount of fuel oil; in order to meet the environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F103/10
Inventor 吴丽蓉潘竟军李慧敏刘伟罗兆张艳萍王艳芬鲁永蒲
Owner PETROCHINA CO LTD
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