Industrial Wastewater Treatment Case Study

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Industrial Wastewater Treatment

Anguil Environmental Systems received a request to quote an oxidizer and packed tower air stripper to treat a 65 gallon per minute water stream containing significant concentrations of Diesel Range Organics (DRO), Volatile Organic Compounds (VOCs) and some Total Suspended Solids (TSS). The customer’s overall project goals were to reduce facility emissions, ideally to zero, as well as minimize the maintenance activities they were conducting on their cooling tower heat exchangers due to fouling from the process water.

Application engineers at Anguil determined that a Regenerative Thermal Oxidizer (RTO) would meet the customer’s needs but were skeptical that the air stripper would function properly given the customer supplied water characteristics. Anguil Aqua was engaged to evaluate the water stream for the air stripping application. Their review of the supplied water analysis indicated that concentrations of heavier organics Diesel Range Organics (naphthalene and higher) were beyond their solubility limits. Hence, the presence of free product in this water stream would quickly cause any air stripper to foul, detrimentally impacting stripping performance and potentially creating a safety hazard. Anguil Aqua recommended that the customer evaluate oil/water separation and emulsion breaking to remove and potentially recover the free product prior to entering the air stripper.

Using water samples, an initial bench evaluation of oil/water separation was conducted. Upon receiving the samples, Anguil realized that either the supplied water analysis had been done incorrectly or that the water samples received were not characteristic of the analysis since the presence of free product was not observed. The emulsion breaking tests were performed anyway, predictably meeting with little success. In addition to the emulsion breaking tests, Anguil attempted to coagulate the water to determine if this approach would be suitable and determined that this method had merit.  Continue Reading