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DON and CON in Seven BNR Wastewater Treatment Plants' Processes and Effluents

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In this study, nitrogen species and nitrogen fractionation with microfiltration and flocculation and filtration (FF) were investigated. Wastewater samples were collected from 7 biological nutrient removal (BNR) wastewater treatment plants (WWTPs) in the United States. It was found that ammonium and organic nitrogen (ON) was majority fraction of influent nitrogen species, but their ratio varied during 3 sampling dates. Colloidal organic nitrogen (CON) fraction was as high as 74 percent of influent ON. CON and ON decreased during primary (10–30%) and secondary treatment (30–60%) process. The removal efficiency varied with process configurations. CON and ON removal were not significant across filtration and disinfection. WWTPs with external carbon addition successfully removed nitrogen to low level (< 7 mg N/L). Plants with longer sludge retention time (SRT) produced low effluent SN levels, but ON/SN ratio was more significant. Removal of CON in high colloidal effluent can minimized effluent nitrogen level about 0.5–1.0 mg N/L.
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Keywords: biological nutrient removal (BNR); dissolved organic nitrogen (DON); nitrogen removal; wastewater treatment

Document Type: Research Article

Publication date: 2009-01-01

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