Biological-photocatalytic combined treatment method for oil-containing waste residues

Abstract

The invention discloses a biological-photocatalytic combined treatment method for oil-containing waste residues. The biological-photocatalytic combined treatment method comprises the following steps of: A, adding an oil sludge dispersing agent which accounts for 0.5-1.5% of the mass of the oil-containing waste residues into the oil-containing waste residues, and stirring to reduce the viscosity of oil particles to a dispersed state; B, transferring the pretreated waste residues into a waste residue reaction tank, adding a biological activator and a photocatalyst into the reaction tank, controlling the mass ratio of the pretreated waste residues to the biological activator to the photocatalyst to be 100: (0.08-0.2): (0.5-1), and adjusting the pH value of a reaction system to be 7.0-7.5; and C, performing constant-temperature illumination on the waste residue reaction tank for 4-6 days by using an LED lamp at 20-25 DEG C, wherein the illumination period is 6h / d, and introducing air into the tank at the air flow rate of 0.4-0.6m < 3 > / min and the ventilation time of 3-6 hours every 2 days in the treatment process to maintain an aerobic environment. According to the biological-photocatalytic combined treatment method, efficient degradation treatment of low-oil-content waste residues and high-oil-content waste residues can be met at the same time, the energy consumption is low, secondary pollution is avoided, and reduction and harmlessness of the low-oil-content waste residues are fully realized.

Description

technical field [0001] The invention belongs to the technical field of harmless treatment of petroleum pollutants in oily waste residues, and in particular relates to a bio-photocatalytic combined treatment method of oily waste residues. Background technique [0002] In the process of drilling and oil production in the oil field, a large amount of oil pollutants such as drilling mud, ground crude oil, settled sediment, and oily external drainage are produced, and various oily sludge and waste residues and other pollutants are produced in tens of thousands of tons every year. The chemical composition of oily sludge is complex, and the oil content is generally 10-50%. If it is discharged directly without treatment, petroleum hydrocarbons in oily sludge will cause pollution and damage to the surrounding soil, air, waters and ecosystems, and release a lot of pollutants. Chlorinated biphenyls, dioxins and other refractory toxic substances. Therefore, the reduction and harmless t...

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Problems solved by technology

Among them, the extraction method mainly deals with waste residues with high oil content and can extract and recover most of the petroleum substances, but the required equipment and extraction agents are expensive, the process is complicated, and there are secondary pollution problems.

The chemical heat washing method is to dilute the oily waste residue with water, and then under the condition of heating and adding a certain amount of chemical agent, the oil is desorbed from the solid phase surface and aggregated to separate the waste residue. It is widely used in the recovery and treatment of light ground crude oil and oil sand crude oil. The disadvantages are that the consumption of chemical reagents is large, the cost is high, and waste water is generated during the treatment process.

The biological treatment method mainly uses microorganisms to degrade the petroleum hydrocarbon organic matter in the oily sludge into harmless soil components, and finally completely mineralize it. This method is only suitable for the treatment of low oily sludge. Waste treatment, microbial activity is inhibited, and the degradation effect is not good. At the same time, the biological treatment method does not require chemicals, saves resources and energy consumption, and has low treatment costs. The treatment effect of isocyclic hydrocarbon components is poor

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