Waste water deep treatment method for thickened oil extracted in oil field
A technology for advanced treatment of heavy oily sewage, applied in mining wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as incomplete treatment of sewage components, residual high COD concentrated water, etc.
Inactive Publication Date: 2018-01-19
德兰梅勒(北京)分离技术股份有限公司
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is to provide a method for advanced treatment of heavy oil wastewater from oilfields. After the method sequentially treats various impurities in the sewage, it uses ozone and biological activated carbon to perform redox treatment on the organic compounds that were originally difficult to degrade. In order to facilitate further degradation operations; and according to the process characteristics of ozone, an intermediate water tank is set up to control the treatment process to ensure the efficiency of ozone biological activated carbon treatment, so that the organic pollutant COD can reach below 50mg / l, which solves the problem of sewage composition in the prior art If the treatment is not complete, a large amount of concentrated high COD concentrated water will remain
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Embodiment 1
[0028] Such as figure 1 As shown, a method for advanced treatment of oilfield heavy oil wastewater, comprising the following steps:
[0029] S1. Oil separation, put the heavy oil sewage from the oil field into the grease trap, and after standing for a certain period of time, the heavy oil and impurities settled in the grease trap will accumulate in the sludge bucket at the bottom of the pool and pass through the sludge discharge pipe Into the sludge pipe, the rest is the overflow from the upper layer; in this embodiment, as a preference, the settling time of the heavy oil sewage from the oil field in the grease trap is 5-10 minutes.
[0030] Its working principle is to use the different specific gravity of suspended solids and water in wastewater to achieve the purpose of separation. The grease trap is directly installed on the channel containing sewage and oily water, and the sewage outlet is aligned with the inlet of the oil-water separator with a grid, and can be connected...
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The invention relates to the field of petroleum collection and particularly relates to a deep treatment method for thickened oil waste water. The waste water deep treatment method comprises the following steps: isolating oil; performing air floatation; performing anaerobic decomposition to put air floatation clarified liquor into an anaerobic pool, keeping at 15-45 DEG C, standing for a certain period of time and then obtaining undegraded waste water; performing oxidative degradation, arranging biological activated carbon in an ozone reaction vessel, introducing ozone into the ozone reaction vessel, and standing for a certain period of time to obtain degraded waste water; and then treating with a quick infiltration device, and thus obtaining purified water to be discharged. According to the waste water deep treatment method for thickened oil extracted in an oil field, after treating various impurities in the waste water in sequence, ozone and biological activated carbon are utilized toperform oxidized reduction treatment on an original hard-to-degrade organic compound, so as to be beneficial for further degradation operation; and an intermediate water tank is arranged according tothe processing property of ozone so as to control the treatment process, thus ensuring the ozone biological activated carbon treatment efficiency, reducing organic pollutant COD to be below 50mg / l, and providing effective guarantee for reaching the standard stably.
Description
technical field [0001] The invention relates to the field of oil collection, in particular to a method for advanced treatment of heavy oil sewage. Background technique [0002] The pollutants in the wastewater formed by heavy oil extraction in oilfields are mainly petroleum, suspended solids (Suspended Substance, SS), sulfide, chemical oxygen demand (Chemical Oxygen Demand, COD), etc. Oily sewage generally adopts mature process devices of oil separation + air flotation + anaerobic / aerobic reaction. The existing process devices can effectively remove oil and SS, and then meet the specified discharge standards. However, at present, my country has always adopted the national GB8978-1996 "Integrated Wastewater Discharge Standard" (hereinafter referred to as "national standard"). The standard was promulgated in 1996, twelve years ago, some indicators in the "national standard", especially COD, petroleum and other indicators, can no longer meet the actual needs of my country's exis...
Claims
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Login to View More IPC IPC(8): C02F9/14C02F103/10
Inventor 马俊
Owner 德兰梅勒(北京)分离技术股份有限公司