DO2E Wastewater Treatment

Online effluent monitoring helps automotive plant stay in compliance - Case Study

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Courtesy of DO2E Wastewater Treatment

Problem
An automotive plant in Ohio needed to treat wastewater for COD removal. Under new regulations, the sequential batch reactor system needed real-time performance data to comply with a new COD discharge limit.

Solution
AppliTek proposed an AppliCOD online monitor, using a titrimetric method for COD measurement. Three months of side-by-side comparison of data from the lab and AppliCOD system showed that the AppliCOD data was about 12 to 18 percent higher than the standard method. The AppliCOD system was mapped for 0 to 1,200 ppm COD with a 4-20mA scale. The high limit was set at 800 ppm and a second high limit was set at 1,000 ppm with alarm relay. The system can be retrofitted or work in tandem with an existing PLC system.

Result
The plant’s average discharge limit of 1,500 ppm COD was met and the quarterly compliance samples were also within the discharge limit. After a year, the plant remains in compliance.

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