Oil product and organic chemical storage tank cleaning sewage treatment system and treatment method thereof

Abstract

The invention discloses an oil product and organic chemical storage tank cleaning sewage treatment system and a treatment method thereof. The system comprises a sump oil component treatment subsystem,a sewage component treatment subsystem and a solid component treatment subsystem which are connected in parallel. The sump oil component treatment subsystem, the sewage component treatment subsystemand the solid component treatment subsystem are converged at an air flotation pretreatment system. The air flotation pretreatment system comprises a pretreatment unit and an air flotation unit. The sump oil component treatment subsystem comprises a sedimentation tank, a sump oil filtering unit, a first storage unit and a vertical oil storage tank which are sequentially connected. The sewage treatment system comprises a sedimentation pool, a sewage filtering unit and a second storage unit which are sequentially connected. The solid component treatment system comprises an impurity tank and a centrifugal dewatering unit which are sequentially connected. The system can select a customized process according to different oily sewage, completely eliminates the sump oil discharged to adjacent water bodies, can realize the recovery and utilization of oil component resources, and has low energy consumption and good effect.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a zero-discharge treatment system and method used in oily wastewater from oil refinery, oily wastewater from petrochemical industry, oily wastewater from circulating water, and oil and gas production water, etc., belonging to the field of industrial wastewater treatment. Background technique [0002] In the field of industrial sewage treatment, oily wastewater is one of the common industrial wastewater. Oily wastewater mainly comes from petroleum, petrochemical, steel, coking, gas generation stations, mechanical processing and other industrial sectors. Specifically, it refers to: asphalt production equipment often reduces Piezoelectric desalination drainage, combined electric desalination drainage and sulfur plant alkali slag treatment device mixed drainage, because this unit of wastewater often contains a large amount of oil (the present invention refers to petroleum) and high COD...

AI Technical Summary

Problems solved by technology

The impact of oil substances on the environment is multifaceted, such as polluting the water body, forming an oil film on the water surface, which can hinder the reoxygenation of the water body, and due to the reduction of dissolved oxygen in the water body, the photosynthesis of algae is limited, affecting the normal growth of aquatic organisms, making Aquatic animals and plants have oily smell or toxicity, and even make the water body smelly, destroying the utilization value of water resources; the oil adheres to the gills of the fish, which can suffocate the fish. When the concentration is 200mg / L, the fish cannot survive; it adheres to the algae , Plankton, can kill them; oil will inhibit waterfowl spawning and hatching, and in severe cases, cause a large number of birds to die; use oily wastewater to irrigate farmland, oil and its derivatives will cover the surface of soil and plants, blocking the soil Pores prevent air from penetrating, prevent soil and microorganisms from performing normal metabolism, reduce the quality and practical value of agricultural products, and cause crop yield reduction or death in severe cases, oil migrates downward in the soil, and may cause serious groundwater pollution

[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 The reuse of oily wastewater after treatment does not meet the requirements of sustainable development

Images