Petrochemicals

The increasing number of petroleum products has led to a gradual increase in the variety of pollutants in petrochemical wastewater. Therefore, it is necessary to continuously improve the traditional treatment process and develop new treatment technologies in order to improve the utilization rate of water resources in the petrochemical industry. Based on advanced water treatment technologies and extensive experience, BOC Sciences can help you find the right solution for wastewater discharge/reuse and process water treatment.

Major Petrochemicals Pollutants

• Sulfides

Sulfides in oil-bearing wastewater come mainly from the drainage process of secondary processing units.

• Organic pollutants and ammonia nitrogen

Organic pollutants and ammonia nitrogen are mainly discharged from process units such as catalytic cracking.

• Oil

Oil in oily wastewater mainly comes from the condensate of oil refining equipment and the washing water of tank cleaning, etc.

• Dissolved salts

Drainage from electric desalination units and effluent from circulating water plants are the main sources of dissolved salts.

Petrochemicals Water Treatment Solution

• Water treatment process

First of all, the oily wastewater should be treated by gravity grease trap. The gravity separation process removes the floatable oil from the oily wastewater. After removing the floatable oil, the oily wastewater is introduced into the neutralization tank, and then acid and alkali and inorganic salts are put into the neutralization tank to make the pH of the wastewater reach the target of process requirements. The water from the neutralization tank is introduced into the conditioning tank to equalize the water quality and control the pH value of the water in the equalization tank to about 8. The catalyst is put into the homogenization tank, and the effluent is de-sulfurized within a reasonable range of aeration intensity to control the mass concentration of sulfide in the effluent within a reasonable range. At the same time, the effluent after de-retention is put into the air floatation tank to break the emulsion of suspended matter and emulsified state oil in the effluent.

Biochemical reaction link is the key element of wastewater treatment, relying on gravity self-flow to introduce the water in the air floatation tank to the biochemical treatment part. The biochemical treatment means that the effluent from the secondary sedimentation tank is treated again by dosing, so that the effluent reaches the high-density clarifier and the suspended matter and some organic matter in the effluent are effectively removed. Finally, the effluent is introduced into the monitoring tank for discharge for secondary reuse.

• Process of reuse water treatment

The water from the high-density clarifier is introduced into the filter, which effectively reduces the suspended matter content in the water. In order to minimize the workload of the activated carbon filter, the filtration operation of the colloidal substances in the effluent is required. A pump is used to introduce the ultrafiltration effluent into the activated carbon filter; activated carbon is used to adsorb the organic matter in the water and a high-pressure pump is used to introduce the adsorbed water directly into the permeate membrane system; permeate membranes are used to filter the ions in the water and ensure that the salt concentration in the water does not exceed the standard.

BOC Sciences’ water solutions can improve your plant's performance and increase your uptime through services that address the entire life cycle of your project, from early, front-end engineering to plant operation. If you are interested in our products or want to learn more about water treatment solutions in various industries, please feel free to contact us .