Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Comparison between kinetics of autochthonous marine bacteria in activated sludge and granular sludge systems at different salinity and SRTs |
| Abstract | Biological nutrient removal performances and kinetics of autochthonous marine biomass in forms of activated sludge and aerobic granular sludge were investigated under different salinity and sludge retention time (SRT). Both the biomasses, cultivated from a fish-canning wastewater, were subjected to stepwise increases in salinity (þ2 gNaCl L1), from 30 gNaCl L1 up to 50 gNaCl L1 with the aim to evaluate the maximum potential in withstanding salinity by the autochthonous marine biomass. Microbial marine species belonging to the genus of Cryomorphaceae and of Rhodobacteraceae were found dominant in both the systems at the maximum salinity tested (50 gNaCl L1). The organic carbon was removed with a yield of approximately 98%, irrespective of the salinity. Similarly, nitrogen removal occurred via nitritation-denitritation and was not affected by salinity. The ammonium utilization rate and the nitrite utilization rate were approximately of 3.60 mgNH4-N gVSS1h1 and 10.0 mgNO2-N gVSS1h1, respectively, indicating a high activity of nitrifying and denitrifying bacteria. The granulation process did not provide significant improvements in the nutrients removal process likely due to the stepwise salinity increase strategy. Biomass activity and performances resulted affected by long SRT (27 days) due to salt accumulation within the activated sludge flocs and granules. In contrast, a lower SRT (14 days) favoured the discharge of the granules and flocs with higher inert content, thereby enhancing the biomass renewing. The obtained results demonstrated that the use of autochthonous-halophilic bacteria represents a valuable solution for the treatment of high-strength carbon and nitrogen saline wastewater in a wide range of salinity. Besides, the stepwise increase in salinity and the operation at low SRT enabled high metabolic activity and to avoid excessive accumulation of salt within the biomass aggregates, limiting their physical destructuration due to the increase in loosely-bound exopolymers. |
| Source | Water research (Oxf.) |
| Keywords | Activated sludge Aerobic granular sludge Autochthonous-halophilic bacteria Shortcut nitrification Saline wastewater |
| Journal | Water research (Oxf.) |
| Editor | Pergamon Press., New York, Regno Unito |
| Year | 2018 |
| Type | Articolo in rivista |
| DOI | 10.1016/j.watres.2018.10.086 |
| Authors | Santo Fabio Corsino, Marco Capodici , Francesca Di Pippo , Valter Tandoi, Michele Torregrossa |
| Text | 396673 2018 10.1016/j.watres.2018.10.086 Scopus 2 s2.0 85055900661 ISI Web of Science WOS WOS 000452931600042 Activated sludge Aerobic granular sludge Autochthonous halophilic bacteria Shortcut nitrification Saline wastewater Comparison between kinetics of autochthonous marine bacteria in activated sludge and granular sludge systems at different salinity and SRTs Santo Fabio Corsino, Marco Capodici , Francesca Di Pippo , Valter Tandoi, Michele Torregrossa Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Universita di Palermo IRSA CNR Water Research Institute, National Research Council Biological nutrient removal performances and kinetics of autochthonous marine biomass in forms of activated sludge and aerobic granular sludge were investigated under different salinity and sludge retention time SRT . Both the biomasses, cultivated from a fish canning wastewater, were subjected to stepwise increases in salinity þ2 gNaCl L1 , from 30 gNaCl L1 up to 50 gNaCl L1 with the aim to evaluate the maximum potential in withstanding salinity by the autochthonous marine biomass. Microbial marine species belonging to the genus of Cryomorphaceae and of Rhodobacteraceae were found dominant in both the systems at the maximum salinity tested 50 gNaCl L1 . The organic carbon was removed with a yield of approximately 98%, irrespective of the salinity. Similarly, nitrogen removal occurred via nitritation denitritation and was not affected by salinity. The ammonium utilization rate and the nitrite utilization rate were approximately of 3.60 mgNH4 N gVSS1h1 and 10.0 mgNO2 N gVSS1h1, respectively, indicating a high activity of nitrifying and denitrifying bacteria. The granulation process did not provide significant improvements in the nutrients removal process likely due to the stepwise salinity increase strategy. Biomass activity and performances resulted affected by long SRT 27 days due to salt accumulation within the activated sludge flocs and granules. In contrast, a lower SRT 14 days favoured the discharge of the granules and flocs with higher inert content, thereby enhancing the biomass renewing. The obtained results demonstrated that the use of autochthonous halophilic bacteria represents a valuable solution for the treatment of high strength carbon and nitrogen saline wastewater in a wide range of salinity. Besides, the stepwise increase in salinity and the operation at low SRT enabled high metabolic activity and to avoid excessive accumulation of salt within the biomass aggregates, limiting their physical destructuration due to the increase in loosely bound exopolymers. Published version https //www.scopus.com/record/display.uri eid=2 s2.0 85055900661 origin=resultslist sort=plf f src=s st1=Di Pippo st2=Francesca nlo=1 nlr=20 nls=afprfnm t sid=52bc6f949f35709c6c38b67f63c68c88 sot=anl sdt=aut sl=40 s=AU ID%28%22Di Pippo%2c Francesca%22 15831265700%29 relpos=4 citeCnt=28 searchTerm= Comparison between kinetics of autochthonous marine bacteria in activated sludge and granular sludge systems at different salinity and SRTs Comparison between kinetics of autochthonous marine bacteria .pdf Articolo in rivista Pergamon Press. 0043 1354 Water research Oxf. Water research Oxf. Water res. Oxf. Water research. Oxf. francesca.dipippo DI PIPPO FRANCESCA |