City of Corning Nutrient Removal Study

The City of Corning Wastewater Treatment Plant (WWTP) is a well
maintained treatment plant that is able to meet the conditions of its current
SPDES Permit. The plant will likely be required to perform nutrient removal in
the future to reduce the nitrogen and phosphorus in the effluent. The level of
nutrient removal required will depend on New York State’s development of
a Watershed Implementation Plan that is being prepared in response to the
forthcoming TMDL for the Chesapeake Bay Watershed.
This report addressed two levels of nutrient removal upgrades that were
specified by the NYS DEC in the renewed SPDES permit. The City of
Corning WWTP was not designed to perform nutrient removal; therefore,
each of these alternatives would require capital improvements and would
result in additional operating and maintenance cost for the City.
Alternatives were investigated to optimize nutrient removal at the plant to
meet an effluent goal of Total Nitrogen (TN) < 12.0 mg/L and Total
Phosphorus (TP) < 2.0 mg/L. The plant currently cannot meet these effluent
concentrations. Chemical addition can be used to remove phosphorus to
achieve an effluent TP of < 2.0 mg/L. There were no alternatives identified
that could optimize the plant to meet the TN of < 12.0 mg/L without the
addition of significant capital improvements. The estimated cost to
implement chemical precipitation of phosphorus was $18,900 with a
continued chemical cost of approximately $7,000 per year.
The City of Corning WWTP can achieve the Best Available Technology
(BAT) levels for nutrient removal only if significant capital upgrades are
performed at the plant. The addition of tertiary treatment for denitrification is
required to meet the effluent Total Nitrogen limit of < 5.0 mg/L. The effluent
TP limit of < 0.5 mg/L may be achievable through chemical precipitation
and settling in the final settling tank or in combination with an effluent filter.