Oil-containing waste water processing and recycling method

Abstract

The invention relates to an oil-containing waste water processing and recycling method. Oil-containing waste water is processed through a process adopting rotational flow extraction and separation, an internal-circulation biological aerated filtering pool, traditional biochemical treatment, multi-medium filtering, ozone oxidation / a buffer pool, secondary biochemical treatment, and a reverse osmosis system. The Oil-containing waste water comes from an oil-refining enterprise, and specifically is draining of normal / reduced-pressure electro-desalting through an asphalt producing device, draining of electro-desalting through an integrated device, and mixed draining of an alkaline-residue processing apparatus from a sulphur workshop. According to the oil-containing waste water processing and recycling method, light oil is adopted for extracting and separating oil in the oil-containing waste water to remove most of the oil in the waste water, and residual oil and organic matters in the waste water is filtered through the internal-circulation biological aerated filtering pool to stabilize the water quality for later processing and ensure normal stable operation of conventional biochemical treatment. The process of oxidation, secondary biochemical treatment, and desalting is added after the traditional biochemical treatment, so that the oil-containing waste water is finally reused rather than drained.

Description

technical field [0001] The invention relates to the field of comprehensive treatment of industrial wastewater, in particular to a treatment and reuse method for oily wastewater. Background technique [0002] As an industry with high energy consumption and high pollution, petrochemical industry discharges a large amount of industrial wastewater every year. Different refinery processes and products lead to large differences in the amount and quality of water discharged by various enterprises, but the discharged wastewater contains a large amount of toxic and harmful organic pollutants. With heavy crude oil and high sulfidation, more additives are added in the refining process, the refractory substances in the wastewater increase, and the biodegradability of the wastewater becomes worse. [0003] The oily wastewater mentioned in the present invention refers to the oily wastewater of oil refining enterprises, specifically refers to: asphalt production device atmospheric and vac...

AI Technical Summary

Problems solved by technology

[0004] The investigation of the treatment process of oily wastewater discharged by oil refineries found that at present, oily wastewater is treated by traditional processes. The main processes include: oil separation + flotation + biochemical, and more discharge after wastewater treatment, which undoubtedly causes a great waste of water resources

In the process of treating with traditional technology, due to the large fluctuation of oil content in oily wastewater, the wastewater treatment system is often paralyzed, and the recovery period of the system after each impact is also very long, which seriously affects the normal production of the enterprise, let alone Reuse of oily wastewater after treatment

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