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Pretreatment method for high-acid inferior crude oil processing wastewater

A crude oil processing and wastewater technology, applied in water/sewage multi-stage treatment, flotation water/sewage treatment, water/sludge/sewage treatment, etc., can solve the failure to meet the expected purpose of reusing oily sewage and salty sewage to meet the standard , the inability to effectively treat wastewater and other problems

Active Publication Date: 2013-08-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the survey, based on the same reason as above, it is generally difficult for the COD of the effluent of the oily sewage treatment series to be lower than 100mg / L, while the COD of the effluent of the saline sewage treatment series is as high as 200mg / L or more, which cannot meet the requirements of oily sewage reuse and salty sewage. Expected purpose of wastewater compliance
[0004] As mentioned above, the existing wastewater treatment methods cannot effectively treat the wastewater produced by high-acid crude oil production units, and wastewater treatment has become one of the obstacles restricting the use of high-acid crude oil, especially in areas where water resources are scarce and wastewater discharge standards are strict. The main obstacle for enterprises to process high-acid crude oil

Method used

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  • Pretreatment method for high-acid inferior crude oil processing wastewater
  • Pretreatment method for high-acid inferior crude oil processing wastewater
  • Pretreatment method for high-acid inferior crude oil processing wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The treatment method of the present invention is used to treat the wastewater discharged from the electric desalting device of a domestic high-acid and low-quality crude oil refining and chemical enterprise. The main pollutants in wastewater are COD 5400mg / L (chromium method, the same below), petroleum 600mg / L, total oil 2000mg / L, ammonia nitrogen 60mg / L, volatile phenol 50mg / L, sulfide 10.0mg / L, pH 8.5 .

[0028] Adopt oil separation-acidification demulsification-dissolved air flotation-UASB-SBR-filtration combined process of the present invention to carry out laboratory treatment test on the above-mentioned wastewater, the wastewater treatment scale is 200mL / h, the main experimental devices of each treatment unit are composed and operated The conditions and treatment effects are shown in Table 1. After being treated by the method of the present invention, the COD in the electric desalination wastewater can be reduced to below 300 mg / L, the petroleum can be reduced to...

Embodiment 2～3

[0035] Using the treatment device of Example 1 to treat the same sewage as in Example 1, the wastewater treatment effects obtained by changing the operating conditions of each treatment unit are shown in Table 2 and Table 3, respectively.

[0036] Main processing unit constitution and processing effect of table 2 embodiment 2

[0037]

[0038]

[0039] Main processing unit composition and processing effect of table 3 embodiment 3

[0040]

[0041]

Embodiment 4

[0043] The treated effluent of Example 1 is sent continuously to the sewage treatment plant, the displacement accounts for 30% of the treated water volume of the sewage treatment plant, the sewage treatment plant can operate normally and stably, and the drainage of the sewage treatment plant can reach the discharge standard (COD value is lower than 60mg / L) .

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Abstract

The invention relates to a pretreatment method for high-acid inferior crude oil processing wastewater. The method comprises the following steps of: treating electric desalting wastewater in the process of refining the high-acid inferior crude oil by using an oil removal-demulsification-gas dissolving floatation-up-flow anaerobic sludge bed reactor-intermittent activated sludge process combined process; and performing biochemical treatment on effluent obtained through treatment, or treating the effluent obtained through treatment by an additionally built secondary biochemical treatment unit, and discharging the treated effluent after the treated effluent reaches a discharge standard, wherein the demulsification is carried out under the condition that the pH value is 5-6. In the method, thehigh-acid inferior crude oil electric desalting wastewater is effectively treated by a proper treatment method, the treatment of sewage of other sources is not impacted, a benefit is brought to the stable operation of oil removal, floatation, biochemical and advanced treatment units in the finally sewage field, and the method is favorable for stably reaching the standard, and treating and recycling the high-acid inferior crude oil processing wastewater.

Description

technical field [0001] The invention relates to a pretreatment method for processing waste water of high-acid low-quality crude oil, which is suitable for treating waste water discharged from an electric desalting device in the process of processing high-acid low-quality crude oil. Background technique [0002] With the continuous development and utilization of crude oil, the output of heavy crude oil is increasing, and its density, viscosity, sulfur content, and acid value increase accordingly. According to preliminary statistics on the crude oil market in recent years, the global production of high-acid crude oil (acid value ≥ 0.5mg KOH / g) has accounted for 5.5% of the total development, and is increasing at an average annual rate of 0.3%. Due to the increasing shortage of crude oil resources and the obvious price advantage of high-acid crude oil, the centralized or large-scale processing of high-acid crude oil has become the development trend of refining and chemical indu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F3/30C02F1/24
Inventor 郭宏山许谦刘淑鹤朱卫
Owner CHINA PETROLEUM & CHEM CORP
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