Treatment system for industrial oily wastewater

Abstract

The invention discloses a treatment system for industrial oily wastewater. The treatment system comprises a water storage tank, an oil separation tank, a fine grid, a primary settling tank, a regulating tank, a first bacteria digestion tank, a second bacteria digestion tank, a first aeration buffer tank, a second aeration buffer tank, a sludge remaining tank, a high-temperature and high-pressure tank, an MBR tank, an emergent accident pool, a backwashing chamber, an automatic dosing device, an oil storage tank, a mud storage tank and the like. Compared with the prior art, the treatment system has the advantages that the pollutant removal capacity is remarkably improved, the removal rate of chemical oxygen demand reaches 98.4%, the removal rate of ammonia nitrogen reaches 97.6%, the removal rates of petroleum, animal oil and vegetable oil reach 99.4%, the removal rate of five-day biochemical oxygen demand reaches 96.7%, the removal rate of suspended solids reaches 99.9%, the removal rate of total phosphorus reaches 98.6%, and the removal rate of an anionic detergent reaches 97.2%; membrane pollution is controlled by virtue of chemical cleaning and powdered activated carbon adsorption in a backwashing process of the MBR tank; the whole system is completely controlled by virtue of an automatic program, and functions of comprehensively and automatically opening and closing a gate of a water pump are achieved.

Description

technical field [0001] The invention relates to a treatment system for industrial oily wastewater, which belongs to the field of water treatment in environmental protection. Background technique [0002] Oily substances contained in oily wastewater include natural petroleum, petroleum products, tar and its fractions, and edible animal and vegetable oils and fats. In terms of pollution to water bodies, it is mainly oil and tar. Due to the great difference in the oil concentration in the wastewater discharged from different industrial sectors, such as the wastewater generated in the oil refining process, the oil content is about 150-1000mg / L, the tar content in the coking wastewater is about 500-800mg / L, and the wastewater discharged from the gas generation station The tar content can reach 2000-3000mg / L. Therefore, the treatment of oily wastewater should first use the grease trap to recover slick oil or heavy oil, the treatment efficiency is 60% to 80%, and the oil content ...

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Problems solved by technology

[0003] If the oily wastewater is not recycled, it will cause waste; if it is discharged into rivers, lakes or bays, it will pollute the water body and affect the survival of aquatic organisms; if it is used for agricultural irrigation, it will block the soil gap and hinder the growth of crops

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