Operating Experience of the First and Largest Low Level Nitrogen Removal Facility in Long Island Sound

Brown, Jeanette; Sadick, Thomas A.

doi:10.2175/193864707787976614

Cited by 3 publications

(2 citation statements)

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“…Ikenberry et al (2002) reported secondary effluent DON values ranging from 1.0 mg/L to 1.5 mg/L at the Truckee Meadows Water Reclamation Facility in Reno, Nevada, which consists of activated sludge with separate stage nitrification and denitrification. Brown et al (2007) reported an average organic nitrogen concentration of 2.9 mg/L in the secondary effluent of a BNR plant in Stamford, Connecticut.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Organic Nitrogen Removal in Municipal Wastewater by Reverse Osmosis

Merlo

Wong

Occiano

et al. 2012

Water Environment Research

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The results of a pilot study that was conducted to determine the total nitrogen removal by the reverse osmosis process are presented. The organic nitrogen removal rates are compared with removals observed from three full-scale reverse osmosis facilities and four pilot studies. The results of this analysis suggest that organic nitrogen removal is variable and that reverse osmosis may not consistently produce total nitrogen levels less than 1.0 mg/L without additional treatment. Three hypotheses to explain the variability in organic nitrogen removal in the different data sets are presented. Water Environ. Res., 84, 588 (2012).

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Section: Introductionmentioning

confidence: 99%

Analysis of Organic Nitrogen Removal in Municipal Wastewater by Reverse Osmosis

Merlo

Wong

Occiano

et al. 2012

Water Environment Research

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“…Capital costs are also high. For example, the nitrogen removal upgrade of a 24 million gallon per day activated sludge plant cost $2 per gallon per day capacity (Brown et al, 2007). Similarly, phosphorus removal by biological or chemical means adds cost.…”

Section: Introductionmentioning

confidence: 99%

Nutrient Removal by Algae Grown in CO2-Enriched Wastewater over a Range of Nitrogen-to-Phosphorus Ratios

Fulton¹

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Nutrient Removal by Algae Grown in CO 2 -Enriched Wastewater over a Range of Nitrogen-to-Phosphorus Ratios Laura FultonIn conventional wastewater treatment, biological nutrient removal (BNR) depends on bacterial assimilation for phosphorus removal and nitrification+denitrification for nitrogen removal, with the resulting loss of the fixed nitrogen resource. Alternatively, treatment by microalgae allows for assimilative removal of both phosphorus (P) and nitrogen (N) thereby avoiding the oxygen demand of nitrification and preserving fixed N for fertilizer use. Paddle wheel mixed high-rate ponds have much higher algal productivity than typical oxidation ponds, but even high-rate ponds often cannot grow sufficient algae to completely assimilate the N and P in domestic wastewater. Algae growth in high-rate ponds is usually limited by the inorganic carbon concentration. Addition of carbon dioxide to high-rate ponds, for example from flue gas, eliminates this limitation and accelerates algae growth and nutrient assimilation. This laboratory study explored the extent to which soluble N and P are removed simultaneously by CO 2 -enriched algae cultures.Algal polycultures were grown on diluted domestic wastewater media that were manipulated to obtain a wide range of N:P ratios (2.5:1 to 103:1). In addition, two levels of trace metal concentrations were studied. Media feeding was semi-continuous. The variables monitored included N and P removals, the range of N:P ratios in the algal biomass, biomass production, and alkalinity. To achieve removal of total N and P, suspended solids also must be removed prior to discharge. Since flocculation and settling is a preferred method of algae removal, the effects of low dissolved nutrient concentrations and media composition on algae sinking potential (settleability) were also investigated.The low trace metal cultures achieved >99% total ammonia nitrogen (TAN) removal for N:P ratios 2.5 through 30 and >98% dissolved reactive phosphorus (DRP) removal for N:P ratios 2.5 through 60 (with one exception at N:P-20). This removal was due to the growth of 180-500 mg/L algal volatile solids. Effluent concentrations were <0.1 mg/L TAN for N:P 2.5 through 30, and <0.5 mg/L TAN for N:P-60. DRP effluent concentrations were ≤0.02 mg/L DRP. After 24 hours of settling in beakers, nearly all cultures had total suspended solids (TSS) concentrations <40 mg/L. Alkalinity consumption increased with increasing N:P ratios.For cultures with the higher trace metal concentrations, nutrient removal was similar: >96% of TAN and >95.9% DRP removal for all N:P conditions. However, settling with these media was poor. TSS concentrations after 24-h of settling were >100 mg/L. No clear relationship for alkalinity was found for these cultures. v N:P ratios in the algal biomass correlated with the N:P ratios in the media, except for control cultures that did not receive wastewater. No relationship was found between settling and the N:P ratios of the media or biomass. Nitrogen-fixing algae thrived in media conta...

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A Role for Shellfish Aquaculture in Coastal Nitrogen Management

Rose

Bricker

Tedesco

et al. 2014

Environ. Sci. Technol.

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Excess nutrients in the coastal environment have been linked to a host of environmental problems, and nitrogen reduction efforts have been a top priority of resource managers for decades. The use of shellfish for coastal nitrogen remediation has been proposed, but formal incorporation into nitrogen management programs is lagging. Including shellfish aquaculture in existing nitrogen management programs makes sense from environmental, economic, and social perspectives, but challenges must be overcome for large-scale implementation to be possible.

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Operating Experience of the First and Largest Low Level Nitrogen Removal Facility in Long Island Sound

Cited by 3 publications

References 0 publications

Analysis of Organic Nitrogen Removal in Municipal Wastewater by Reverse Osmosis

Analysis of Organic Nitrogen Removal in Municipal Wastewater by Reverse Osmosis

Nutrient Removal by Algae Grown in CO2-Enriched Wastewater over a Range of Nitrogen-to-Phosphorus Ratios

A Role for Shellfish Aquaculture in Coastal Nitrogen Management

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