Excess phosphorus (P) in receiving waters can create many serious problems including impairment of drinking water supplies. For this reason, and others, incorporation of phosphorus limits into NPDES discharge permits is being implemented nationwide. Many water resource recovery facilities (WRRFs) will be required to add a new process to achieve new and lower effluent total phosphorus (TP) requirements which may be less than 0.1 mg P/L. With a growing understanding of both chemical and biological P removal, lower levels can be achieved reliably through process monitoring and control.
Regardless of the treatment method, continuous monitoring is essential. Critical parameters include orthophosphate, dissolved oxygen, oxidation-reduction potential (ORP), total suspended solids, and nitrate.
Dr. Robert Smith discusses:
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