Industry Information

New technology for Oily Sludge Reduction

Pub Date:Jan 29, 2023    |    Views:190    |    

At present, most oil mining enterprises in China usually directly landfill or incinerate oily sludge after dehydration and pretreatment. Although these methods are simple to operate and low in cost, they waste resources and cause pollution to the surrounding environment. Therefore, oily sludge is reduced Quantification plays an important role.


The reduction of oily sludge is focused on reducing the amount of volatile pollutants such as oil and gas and places. The oily sludge is separated from water to compress the volume, and the separated sewage can be partially reused. The separated mud cake Using anti-leakage packaging, the sludge reduction effect can reach more than 85%, which reduces the amount of hazardous waste treatment for enterprises and increases the capacity of sludge storage.

The treatment idea of oily sludge reduction can also be to deal with the excess water contained in it. First, pretreatment reduces the water content and increases the oil content, and then recovers the petroleum hydrocarbons in the oily sludge through oil separation method, and finally Harmless treatment of remaining oily residues. The following is an introduction to the pretreatment of oily sludge. Before oil separation and recovery of PHCs, oily sludge usually undergoes dehydration pretreatment due to its high water content. The water content required by different subsequent treatment technologies is different. The commonly used dehydration methods include concentration, weathering, mechanical and drying methods. Wait. Oily sludge has a large filtration specific resistance and is a difficult-to-filter sludge.

At present, the combined process of gravity settling and mechanical filtration is an economical and practical pretreatment method, but the concentrated solution after gravity settling is a multi-phase colloidal system, which is extremely difficult to destabilize, and it is difficult to directly connect with mechanical dehydration, so it is necessary to separate the oil and water first. 

Adding conditioner to destabilize may introduce new pollutants and cause secondary pollution of oily sludge. Therefore, it is of positive significance to develop environmentally friendly pretreatment technology. Ultrasonic pretreatment of oily sludge, sponge effect, local heating and other effects can improve the treatment effect of oily sludge. However, the cost of ultrasonic pretreatment technology is high, and the parameters vary greatly with the composition of oily sludge, so it cannot be popularized on a large scale. At present, the combination of gravity sedimentation, tempering destabilization and mechanical filtration is still the mainstream pretreatment method, which has low cost and good dehydration effect, and can easily meet the requirements of various oil separation technologies.

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