Ultrafiltration Systems Empower Advanced Wastewater Reuse in Refineries, Facilitating Water Conservation and Efficiency Upgrades

Amid the global green transformation of the refining industry and increasingly stringent water resource regulations, the treatment and resource 

recovery of refinery wastewater have become critical for cost reduction, efficiency improvement, and regulatory compliance. Traditional treatment 

processes often suffer from issues such as incomplete suspended solids removal, residual colloidal impurities, downstream equipment clogging, and 

unstable effluent quality; consequently, they struggle to meet the high standards required for circulating cooling water makeup and process water 

reuse in modern refineries. Today, ultrafiltration systems—leveraging high-efficiency, precision filtration—have emerged as core equipment for 

advanced refinery wastewater treatment. By utilizing specialized membranes and modular assemblies, these systems revolutionize wastewater 

treatment practices and offer mature solutions for water conservation and emission reduction.

Refining operations generate significant volumes of oily wastewater, wash water, and circulating system blowdown. These streams contain 

contaminants such as crude oil particles, suspended impurities, macromolecular colloids, and trace COD. Conventional filtration equipment cannot 

achieve the necessary precision separation, often leading to overloaded downstream systems (such as reverse osmosis units and biochemical 

treatment facilities) and frequent fouling or clogging. Integrated ultrafiltration systems serve as the core unit for advanced pretreatment; utilizing 

the microporous sieving mechanism of the membranes, they precisely capture suspended particles, emulsified oil droplets, colloids, and 

microorganisms, effectively resolving the limitations of traditional processes. Specialized ultrafiltration membranes designed for refinery conditions 

offer oil tolerance, fouling resistance, and high mechanical strength, ensuring stable, long-term operation within the complex water quality 

environments typical of refineries.

Currently, many large-scale domestic refining and petrochemical enterprises have implemented "ultrafiltration plus reverse osmosis" 

dual-membrane treatment processes, in which ultrafiltration equipment plays a pivotal role in pretreatment. These highly automated systems 

support continuous, 24-hour operation, with individual units capable of processing hundreds of cubic meters of water per hour. The resulting 

effluent is clear and stable, with suspended solids and turbidity levels approaching zero; this quality fully meets the feed requirements for 

downstream desalination systems, significantly slowing the fouling rate of reverse osmosis membranes and extending the service life of the entire 

water treatment installation. The standardized, modular design of the ultrafiltration membrane units offers great flexibility, allowing for scalable 

assembly based on a refinery's production capacity and wastewater volume to meet the diverse water treatment needs of large, medium, and 

small-scale facilities.

Compared to traditional processes, ultrafiltration systems equipped with high-quality membrane units significantly boost wastewater reuse rates. 

The treated water can be directly utilized for circulating cooling system make-up, process flushing, and site landscaping, effectively reducing the 

procurement of fresh water. Furthermore, the automated nature of the equipment eliminates the need for extensive manual operation and 

maintenance, thereby lowering labor costs and reducing the frequency of equipment servicing. By enabling water recycling, cutting operational 

costs, and ensuring environmental compliance, these systems have become essential core equipment for green production in modern refineries.