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Effect of Carrier Filling Ratios on Dissolved Organic Nitrogen Removal in Integrated Fixed-Film Activated Sludge Systems Treating Municipal Wastewater
https://orcid.org/0000-0003-0193-0333
https://orcid.org/0000-0002-6434-692X
Previous research has focused on the removal characteristics of inorganic nitrogen in the integrated fixed-film activated sludge (IFAS) process. However, information on dissolved organic nitrogen (DON) is scarce, even though DON can be an important form of nitrogen in wastewater treatment plants with low-effluent total nitrogen. This study investigated the removal characteristics of DON in IFAS with three frequently used carrier filling ratios (FRs = 20%, 30%, and 40%). The results showed that effluent DON significantly decreased with an increase in the FR (p < 0.05, t-test). DON hydrophobicity-based fractionation combined with DON molecular composition analysis indicated that effluent DON from IFAS at FRs of 20% and 40% exhibits more lability than that at an FR of 30%, indicating that effluent DON at FRs of 20% and 40% is more prone to stimulate algae. This finding was also supported by an algal bioassay. As a result, there was no bioavailable DON (ABDON) removal increase when the FR of IFAS increased from 30% to 40% (p = 0.925, t-test). Gray relational analysis revealed that the metabolites dihydroceramide, 1-hexanol, and 3-sulfinoalanine had the greatest influence on DON bioavailability. Overall, this study indicates that operating an IFAS process with a higher FR cannot control the DON forms that readily stimulate algal growth.
Effect of Carrier Filling Ratios on Dissolved Organic Nitrogen Removal in Integrated Fixed-Film Activated Sludge Systems Treating Municipal Wastewater
https://orcid.org/0000-0003-0193-0333
https://orcid.org/0000-0002-6434-692X
Previous research has focused on the removal characteristics of inorganic nitrogen in the integrated fixed-film activated sludge (IFAS) process. However, information on dissolved organic nitrogen (DON) is scarce, even though DON can be an important form of nitrogen in wastewater treatment plants with low-effluent total nitrogen. This study investigated the removal characteristics of DON in IFAS with three frequently used carrier filling ratios (FRs = 20%, 30%, and 40%). The results showed that effluent DON significantly decreased with an increase in the FR (p < 0.05, t-test). DON hydrophobicity-based fractionation combined with DON molecular composition analysis indicated that effluent DON from IFAS at FRs of 20% and 40% exhibits more lability than that at an FR of 30%, indicating that effluent DON at FRs of 20% and 40% is more prone to stimulate algae. This finding was also supported by an algal bioassay. As a result, there was no bioavailable DON (ABDON) removal increase when the FR of IFAS increased from 30% to 40% (p = 0.925, t-test). Gray relational analysis revealed that the metabolites dihydroceramide, 1-hexanol, and 3-sulfinoalanine had the greatest influence on DON bioavailability. Overall, this study indicates that operating an IFAS process with a higher FR cannot control the DON forms that readily stimulate algal growth.
Effect of Carrier Filling Ratios on Dissolved Organic Nitrogen Removal in Integrated Fixed-Film Activated Sludge Systems Treating Municipal Wastewater
https://orcid.org/0000-0003-0193-0333
https://orcid.org/0000-0002-6434-692X
Previous research has focused on the removal characteristics of inorganic nitrogen in the integrated fixed-film activated sludge (IFAS) process. However, information on dissolved organic nitrogen (DON) is scarce, even though DON can be an important form of nitrogen in wastewater treatment plants with low-effluent total nitrogen. This study investigated the removal characteristics of DON in IFAS with three frequently used carrier filling ratios (FRs = 20%, 30%, and 40%). The results showed that effluent DON significantly decreased with an increase in the FR (p < 0.05, t-test). DON hydrophobicity-based fractionation combined with DON molecular composition analysis indicated that effluent DON from IFAS at FRs of 20% and 40% exhibits more lability than that at an FR of 30%, indicating that effluent DON at FRs of 20% and 40% is more prone to stimulate algae. This finding was also supported by an algal bioassay. As a result, there was no bioavailable DON (ABDON) removal increase when the FR of IFAS increased from 30% to 40% (p = 0.925, t-test). Gray relational analysis revealed that the metabolites dihydroceramide, 1-hexanol, and 3-sulfinoalanine had the greatest influence on DON bioavailability. Overall, this study indicates that operating an IFAS process with a higher FR cannot control the DON forms that readily stimulate algal growth.
Effect of Carrier Filling Ratios on Dissolved Organic Nitrogen Removal in Integrated Fixed-Film Activated Sludge Systems Treating Municipal Wastewater
Hu, Haidong (Autor:in) / Zhu, Boyang (Autor:in) / Han, Liqin (Autor:in) / Ren, Hongqiang (Autor:in)
ACS ES&T Engineering ; 1 ; 761-769
09.04.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Performance of fixed film media integrated in activated sludge reactors to enhance nitrogen removal
| British Library Conference Proceedings | 1994
Nutrient Removal from Municipal Wastewater by Activated Sludge Process
| Online Contents | 1998
| IOP Institute of Physics | 2013