Method for treating high-temperature, high-salinity difficult-degradation oil producing wastewater

Abstract

The invention discloses a method for treating high-temperature, high-salinity difficult-degradation oil producing wastewater. An organic component, which can be degraded by a microbial agent R1 (4), in the oil producing wastewater is preferentially eliminated in a first-stage aerobic biochemical tank (2); supernate after solid-liquid separation is carried out enters a first-stage ozone pre-oxidizing tank (11) to be pre-oxidized, so that the biodegradability is increased; a biochemical organic matter is further degraded by a microbial agent R2 (21) added into a second-stage aerobic biochemical tank (18), into which outflow water flows; supernate after solid-liquid separation is carried out again flows into a high-stage oxidizing tank (28); little low-biodegradability organic matters remained in water can be thoroughly degraded under the synergistic effect of an ozone generator (15), an ultraviolet lamp light-emitting device (29) and an oxidizing agent adding system (31); and requirements of outflow water to indexes, such as sterilization and chroma, can be achieved. The method is accurate and controllable in target division of various process sections, simple to operate, low in drug adding amount and sludge yield and steady and reliable to output water. The method disclosed by the invention is conveniently popularized and used in the oil field wastewater treatment field.

Description

technical field [0001] The invention relates to a method for treating high-temperature, high-salt and refractory oil production wastewater by using a combined method of primary aerobic biochemistry-ozone pre-oxidation-secondary aerobic biochemistry-advanced oxidation to obtain wastewater up to standard discharge or recycling . Background technique [0002] With the development of modern industry, the human demand for oil is also increasing, and a large amount of wastewater will be produced in the process of oil exploration and refining. These wastewaters often have high temperature (≥50°C), high salinity (≥3.5%) TDS) and complex residual petroleum components, if discharged directly without treatment, it will inevitably cause serious pollution and damage to the external environment. At present, the traditional treatment methods are mainly coagulation-sedimentation-activated carbon adsorption process or coagulation-filtration-ultrafiltration process, in order to meet the disc...

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Problems solved by technology

[0005] In view of the problems existing in the existing high-temperature and high-salt refractory petroleum wastewater treatment methods, such as many equipments, complex control, large dosage of chemicals, high sludge output, unsatisfactory treatment effect on refractory organic matter, and serious secondary pollution, this paper The invention provides a treatment method for such waste water to be discharged up to the standard or recycled

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