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Bioavailable and biodegradable dissolved organic nitrogen in activated sludge and trickling filter wastewater treatment plants.

Permanent URL:
http://handle.nal.usda.gov/10113/57868
File:
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Abstract:
A study was carried out to understand the fate of biodegradable dissolved organic nitrogen (BDON) and bioavailable dissolved organic nitrogen (ABDON) along the treatment trains of a wastewater treatment facility (WWTF) equipped with an activated sludge (AS) system and a WWTF equipped with a two-stage trickling filter (TF) process. A mixed culture bacterial inoculum was used for BDON determination, while a pure cultured algal inoculum (Selenastrum capricornutum) and a combination of the bacterial and alga inocula were used for ABDON determination. Results show that BDON and ABDON varied significantly within the treatment facility and between the two facilities. From after primary clarification to final effluent, the TF facility removed about 65% of BDON and up to 63% of ABDON while the AS facility removed about 68% of BDON and up to 56% of ABDON. For the TF facility, BDON and ABDON were 62% and 71% of the effluent dissolved organic nitrogen (DON), while they were 26% and 47% of the effluent DON for the AS WWTF. BDON and ABDON results further showed that some portions of DON are utilizable by bacteria only or algae only while there is a portion of DON utilizable by either bacteria or algae. DON utilization was the highest when both bacteria and algae were used as a co-inoculum in the samples. This study is the first to investigate the fate of BDON and ABDON along the treatment trains of two different WWTFs.
Author(s):
Halis Simsek , Murthy Kasi , Jae-Bom Ohm , Mark Blonigen , Eakalak Khan
Subject(s):
Selenastrum capricornutum , activated sludge , bacteria , bioavailability , biodegradation , clarification , dissolved organic nitrogen , filters , inoculum , mixed culture , sampling , wastewater treatment
Source:
Water research 2013 v.47
Language:
English
Year:
2013
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.