Smart solution for reducing benzene emissions

An oil refinery in Rotterdam’s harbour needed a 70m3/h water treatment plant for a period of three years, to reduce airborne benzene emissions from the existing biological wastewater treatment. The chosen solution is a separate pre-treatment of the benzene-rich wastewater flow, which is placed in the influent flow of the existing biological treatment process. In the biological treatment plant, the remainder of soluble benzene is degraded. This temporary plant will be used to test whether pre-treatment of the wastewater leads to reduction of the airborne benzene emissions and whether further biological processing is possible.

Logisticon had previously provided a satisfactory water treatment solution for this customer. Therefore, the customer wanted to resolve this issue with Logisticon again.

In process technical terms, the supplied influent is led directly to a Dissolved Air Flotation (DAF) unit by the force of gravity. After dosage of coagulant and a polymer, the DAF-unit separates the oil and solids with help of dissolved air from the wastewater, so that sludge is created. To form the required microbubbles, compressed air is used to float the oil and solids. The buoyant sludge layer is removed, collected, and disposed.

For this test, the DAF-unit is completely covered and equipped with air extraction and treatment with carbon filters to absorb the volatile hydrocarbons. Together with the oil refinery, Logisticon came up with the process design, built and installed the plant, after which it was successfully commissioned.

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