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Pre-Treatment of Ice Cream Manufacturer's Wastewater: Bench-Scale Results

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Currently an ice cream/sugar-based products manufacturer discharges to the Little Patuxent Water Reclamation Plant (LPWRP). The ice cream facility is expanding over the next several years which will increase the percentage of the total hydraulic and organic loads to the LPWRP to 0.5 % and 50%, respectively. The long-term solution is to convey the ice cream facility's wastewater to the LPWRP in a separate sewer and to treat the majority of the flow by an anaerobic process. The remaining portion of the wastewater will be fermented to produce volatile fatty acids (VFAs) that will be used in the plant's enhanced biological nutrient removal (BNR) system.

Until the separate sewer and anaerobic system is constructed the LPRWRP must develop procedures/systems to address the increasing organic load from the ice cream facility. Currently the ice cream wastewater is mixed with domestic wastewater. As the organic load increases there is the potential for the current BNR system to be overwhelmed. The use of enhanced primary settling (alum and polymer addition to grit chamber, removal of solids in primary settling tank) was suggested as a short term solution to the reducing the organic load to the BNR system. After the separate sewer is operational but prior to the completion of the anaerobic treatment system dissolved air flotation (DAF) was proposed to reduce the organic load.


Document Type: Research Article


Publication date: 2007-10-01

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