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Treatment method of offshore oil drilling wastewater

A treatment method, offshore oil technology, which is applied in the field of offshore oil drilling wastewater treatment, can solve problems such as inability to meet wastewater discharge requirements, achieve good treatment effects, increase floating speed, and reduce oil content

Inactive Publication Date: 2019-07-19
XUZHOU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing treatment process of oil production wastewater treatment enterprises cannot meet the discharge requirements of wastewater

Method used

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  • Treatment method of offshore oil drilling wastewater
  • Treatment method of offshore oil drilling wastewater

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Experimental program
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Effect test

Embodiment 1

[0019] A treatment method for offshore oil drilling waste water, comprising the following steps:

[0020] (1) Heat the drilling wastewater to 30°C for physical demulsification, and the reaction time is 2 minutes to precipitate the dissolved impurities in the wastewater.

[0021] (2) Add NaOH to the heated wastewater to adjust the pH of the wastewater to 9. Then the waste water enters the mechanically stirred flocculation tank, and polyaluminum chloride (PAC) 100mg / L is added to the first cell, the stirring time is 60s, and the stirring speed is 60r / min, so that the coagulant is fully mixed and the impurities in the water are destabilized. The stirring time of two grids is 20min, and the stirring speed is 15r / min, so that the impurities in the wastewater are coagulated and flocculated. Add polyacrylamide (PAM) 15mg / L to the third compartment, stir for 20min, and stir at a speed of 10r / min. The effluent from the flocculation tank enters the rotary drum continuous centrifuge fo...

Embodiment 2

[0026] (1) Heat the drilling wastewater to 40°C for physical demulsification. The reaction time is 10 minutes to precipitate the dissolved impurities in the wastewater.

[0027] (2) Add NaOH to the heated wastewater to adjust the pH of the wastewater to 12. Then the waste water enters the mechanical stirring flocculation tank, and the first column is added polyaluminum chloride (PAC) 50mg / L, the stirring time is 30s, and the stirring speed is 40r / min, so that the coagulant is fully mixed and the impurities in the water are destabilized. The mixing time of two grids is 10min, and the stirring speed is 6r / min, so that the impurities in the wastewater are coagulated and flocculated. Add polyacrylamide (PAM) 5mg / L to the third cell, stirring time 10min, stirring speed 5r / min, the effluent from the flocculation tank enters the rotary drum continuous centrifuge for mud-water separation, and the separated sludge is transported out after drying and separated The liquid enters the air...

Embodiment 3

[0032] (1) Heat the drilling wastewater to 36°C for physical demulsification, and the reaction time is 6 minutes to precipitate the dissolved impurities in the wastewater.

[0033] (2) Add NaOH to the heated wastewater to adjust the pH of the wastewater to 10. Then the waste water enters the mechanical stirring flocculation tank, and the first block is added polyaluminum chloride (PAC) 80mg / L, the stirring time is 45s, and the stirring speed is 50r / min, so that the coagulant is fully mixed and the impurities in the water are destabilized. The stirring time of two grids is 15min, and the stirring speed is 10r / min, so that the impurities in the wastewater are coagulated and flocculated. Add polyacrylamide (PAM) 10mg / L to the third cell, stir for 15 minutes, and stir at a speed of 8r / min. The liquid enters the air flotation device for further processing.

[0034] (3) Add polyaluminum chloride (PAC) 35mg / L to the separation liquid and mix thoroughly, and pass through the air flo...

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Abstract

The invention provides a treatment method of offshore oil drilling wastewater. The method comprises the following steps: heating the drilling wastewater and performing physical demulsification; regulating the pH of the wastewater to alkalinity; sequentially adding a coagulant and coagulant aids into the wastewater to promote flocculation of oil sludge particles and improve the dewatering performance; separating solid and liquid through a centrifugal separating device to obtain separated sludge and separated liquid; adding the coagulant and fully mixing the coagulant with the separating liquid;compressing a double electrode layer to condensate oil droplets; charging air into the wastewater, wherein bubbles are adhered to the oil droplets, so that the floating speed of the oil droplets is increased, and solid and liquid separation is achieved; charging ozone to remove organic substances in the wastewater and discolor; adsorbing through activated carbon to further decrease the content ofthe organic substances in the wastewater so as to reduce the pollution of the organic pollutants to a reverse osmosis membrane; and filtering the treated purified wastewater through a reverse osmosissystem by utilizing a membrane so as to remove soluble solid in the wastewater and reach the wastewater drainage standard. The method is obvious in treatment effect.

Description

technical field [0001] The invention relates to the field of special wastewater treatment, in particular to a treatment method for offshore oil drilling wastewater. Background technique [0002] A large amount of oily wastewater will be produced in the process of offshore oil drilling. The wastewater has the characteristics of high organic matter, high salt content, high ammonia nitrogen, etc., and often contains a large amount of aromatic refractory organic matter and toxic and harmful substances. Therefore, the treatment of oily wastewater has always been a problem that plagues oil drilling and production companies and other petrochemical companies. Especially in recent years, the country has paid more and more attention to environmental protection, and put forward higher requirements for the discharge of oil production wastewater. However, the existing treatment process of oil production wastewater treatment enterprises cannot meet the discharge requirements of wastewat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/10
CPCC02F1/02C02F1/04C02F1/24C02F1/283C02F1/40C02F1/441C02F1/5245C02F1/56C02F1/66C02F1/78C02F9/00C02F2103/10
Inventor 刘加强范秀磊杨成方
Owner XUZHOU UNIV OF TECH
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