Method for treating oil field drilling waste water

A technology for oil field drilling and wastewater treatment, which is applied in the directions of water/sewage multi-stage treatment, oxidized water/sewage treatment, water/sludge/sewage treatment, etc. It can solve problems such as difficult practical application, complicated process, and increased material preparation costs , to achieve the effects of convenient on-site application, high COD removal rate, improved catalytic oxidation efficiency and ozone utilization rate

Active Publication Date: 2011-04-27
北京中科国益环保工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the activated carbon-supported iron oxide catalyst combines the catalytic ozonation of activated carbon and iron oxide, and shows a better catalytic ozonation water treatment effect. However, in the current activated carbon-supported iron oxide catalytic ozonation system, the activated carbon-supported Iron oxides have to be prepared separately in advance, the process is complicated and the cost of material preparation is increased, and it is not easy to realize the practical application in the water treatment field

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Add powdered activated carbon (the particle size of the powdered carbon is 200 mesh, and the dosage is 2 g / liter) and ferric chloride (dosage 1.2 grams / liter), add alkali to adjust pH=10, then pass ozone from the bottom of the reactor, ozone concentration 14mg / L, gas flow 300mL / min, reaction time 1 hour;

[0020] 2) Add polyacrylamide (PAM) flocculant to the effluent after catalytic ozonation to condense and precipitate the powdered activated carbon and ferric hydroxide, and separate the water from the precipitate. The COD of the effluent is 1020mg / L, and the removal rate is 51.4%. , according to discharge requirements, the effluent can be discharged after further biochemical treatment.

[0021] 3) The recovered powdered activated carbon and ferric hydroxide precipitation mixture can be recycled as a catalyst, and can also be used as an adsorbent for wastewater pre-adsorption treatment.

Embodiment 2

[0023] 1) Add ferric chloride (dosage: 1.5 g / L) to a reactor containing 1 liter of oilfield drilling wastewater raw water (COD 2100 mg / L) for coagulation pretreatment, stir for 10 minutes and press 5 mg / L Add polyacrylamide (PAM) flocculant, and stir for another 6 minutes, let it stand and settle, and the effluent COD is 640mg / L; add powdered activated carbon (the particle size of powdered carbon is 200 mesh, Addition is 1.6 grams / liter) and ferric trichloride (the dosage of ferric chloride is 0.8 grams / liter), adds alkali and regulates pH=10, then leads ozone from the bottom of the reactor, ozone concentration 14mg / L, Gas flow rate 300mL / min, reaction time 1 hour;

[0024] 2) After catalytic ozonation, add polyacrylamide (PAM) flocculant to the effluent at a dosage of 2 mg / L to coagulate and precipitate the powdered activated carbon and ferric hydroxide, and separate the water from the precipitate. The effluent COD is 200 mg / L, and the removal rate is 67.4%. According to the...

Embodiment 3

[0027] 1) Add powdered activated carbon (the particle size of the powdered carbon is 200 mesh, and the dosage is 2 g / liter) and ferric sulfate (the dosage is 1.0 mg / L) to the reactor containing 1 liter of oilfield drilling wastewater raw water (COD 2100 mg / L). gram / liter), all the other conditions are with embodiment 1.

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Abstract

The invention relates to a method for treating oil field drilling waste water, which comprises the following major steps: A) adding activated carbon and ferric trichloride, ferric sulfate or other ferric salt to oil field drilling waste water, and introducing ozone to perform a catalytic ozonization reaction; and B) after ozonization, adding polyacrylamide flocculant to the outlet water to enablethe activated carbon and ferric hydroxide to be subject to coagulative precipitation, and separating the water and precipitates. By using the method provided by the invention, the COD (Chemical Oxygen Demand) (2000-10000mg/L) removal rate of the oil field drilling waste water can be increased from 10% or so to 50-70% by ozone oxidation.

Description

technical field [0001] The invention relates to a treatment technology for oil field drilling wastewater. Background technique [0002] A large amount of environmentally harmful wastewater is produced during oilfield drilling and drilling. This type of wastewater contains a variety of drilling additives, high COD (chemical oxygen demand), high chroma, complex components, poor biodegradability, and is difficult to treat. How to efficiently remove COD has become an urgent technical problem in the treatment of oil drilling wastewater. [0003] In order to improve the water treatment effect and meet the discharge standards, a combination of various technologies is generally used. Common technology combinations include coagulation-chemical oxidation-biochemical treatment, in which coagulation treatment removes most of the COD by means of iron salts, aluminum salts and other agents on the adsorption of pollutants in water, electrostatic attraction, etc.; but coagulation treatment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F9/14C02F1/52C02F1/78
Inventor 李开明武荣成张宏超徐扬庞景宾
Owner 北京中科国益环保工程有限公司
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