Journal
WATER ENVIRONMENT RESEARCH
Volume 85, Issue 12, Pages 2307-2316Publisher
WATER ENVIRONMENT FEDERATION
DOI: 10.2175/106143013X13807328848379
Keywords
greenhouse gas emissions; nutrients; nitrogen; phosphorus; sustainability
Funding
- Water Environment Research Foundation under Nutrient Removal Challenge [NUTR1R06n]
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This Water Environment Research Foundation study considered the relationship between varying nutrient-removal levels at wastewater treatment plants, greenhouse gas emissions, receiving water quality (measured by potential algal production), and costs. The effluent nutrient concentrations required by some U.S. permits are very low, approaching the technology-best-achievable performance. This study evaluated five different treatment levels at a nominal 40 ML/d (10 mgd) flow. Greenhouse gas emissions and costs increase gradually up to the technologies' best-achievable performance, after which they increase exponentially. The gradual increase is attributed to additional biological treatment facilities, increased energy and chemical use, and additional tertiary nitrogen and phosphorus removal processes. Within the limited focus of this study, the evaluation shows that a point of diminishing return is reached as nutrient-removal objectives approach the technology-best-achievable performance, where greenhouse gas emissions and cost of treatment increases rapidly while the potential for algal growth reduce marginally.
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