Bioavailable and biodegradable dissolved organic nitrogen in activated sludge and trickling filter wastewater treatment plants
| Autor: | Murthy Kasi, Jae-Bom Ohm, Halis Simsek, Eakalak Khan, Mark Blonigen |
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| Rok vydání: | 2013 |
| Předmět: |
Environmental Engineering
Nitrogen Trickling filter Biological Availability Selenastrum Chemical Fractionation Wastewater Biology Waste Disposal Fluid Water Purification Algae Computer Simulation Organic Chemicals Waste Management and Disposal Effluent Water Science and Technology Civil and Structural Engineering Bacteria Sewage Waste management Ecological Modeling Eukaryota Models Theoretical biology.organism_classification Pulp and paper industry Pollution Kinetics Biodegradation Environmental Activated sludge Solubility North Dakota Calibration Sewage treatment Filtration |
| Zdroj: | Water Research. 47:3201-3210 |
| ISSN: | 0043-1354 |
| DOI: | 10.1016/j.watres.2013.03.036 |
| Popis: | 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 65% of BDON and 63% of ABDON while the AS facility removed 68% of BDON and 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, which are based on incubation of samples under different inocula (bacteria only, algae only, and bacteria + algae), 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. |
| Databáze: | OpenAIRE |
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