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Article

Comparative Study on Using Various Recovery Stimulation Methods to Boost Nitrification Recovery in SBRs Inhibited by Hazardous Events

1
Department of Civil Engineering, National Chi Nan University, Puli, Nantou 54561, Taiwan
2
Department of Health and Applied Sciences, Dong Nai Technology University, Bien Hoa 810000, Dong Nai, Vietnam
*
Authors to whom correspondence should be addressed.
Academic Editor: Alexandre T. Paulino
Water 2022, 14(1), 48; https://doi.org/10.3390/w14010048
Received: 30 November 2021 / Revised: 20 December 2021 / Accepted: 23 December 2021 / Published: 26 December 2021
(This article belongs to the Section Wastewater Treatment and Reuse)
A system consisting of six SBR units was operated in parallel for three phases to investigate the impacts of salinity shock and anaerobic and aerobic starvation on the activated sludge process stability and effects of various recovery stimulation methods on the subsequent recovery period. Different recovery strategies were applied in each SBR unit, including natural recovery, adding bio-accelerators, a stepwise increase feed strategy, a stepwise strategy coupled with bio-accelerators dosing, extended aeration time, and extended aeration time coupled with bio-accelerators dosing. It was concluded that the combination of stepwise strategy and dosing bio-accelerators showed the most efficiency in boosting system recovery after being subjected to NaCl shock and starvation. The boosting effect of the stepwise strategy alone was slightly better in recovery after NaCl shock. Furthermore, extending the aeration rate could bring more positive effects when resuscitating the system after long-term anaerobic starvation. For the unit that only received dosing of bio-accelerators during the recovery period, it could be concluded that there was a specific time requirement for the bio-accelerators to take effect significantly, as the impact of bio-accelerators on the beginning days of recovery periods was very slight. In contrast, adjusting operational regimes such as stepwise increased feed volume or extending aeration time could significantly boost the SBRs from the first recovery days. Hence, highly effective recovery efficiency could be achieved by coupling dosing bio-accelerators with other operational adjustment methods, especially stepwise strategies. View Full-Text
Keywords: salinity shock; starvation; recovery stimulating; bio-accelerators salinity shock; starvation; recovery stimulating; bio-accelerators
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MDPI and ACS Style

Nguyen, H.-D.; Yang, C.-C.; Dao, K.-C.; Le, V.-P.; Tsai, Y.-P. Comparative Study on Using Various Recovery Stimulation Methods to Boost Nitrification Recovery in SBRs Inhibited by Hazardous Events. Water 2022, 14, 48. https://doi.org/10.3390/w14010048

AMA Style

Nguyen H-D, Yang C-C, Dao K-C, Le V-P, Tsai Y-P. Comparative Study on Using Various Recovery Stimulation Methods to Boost Nitrification Recovery in SBRs Inhibited by Hazardous Events. Water. 2022; 14(1):48. https://doi.org/10.3390/w14010048

Chicago/Turabian Style

Nguyen, Hoang-Duy, Chih-Chi Yang, Khanh-Chau Dao, Van-Phat Le, and Yung-Pin Tsai. 2022. "Comparative Study on Using Various Recovery Stimulation Methods to Boost Nitrification Recovery in SBRs Inhibited by Hazardous Events" Water 14, no. 1: 48. https://doi.org/10.3390/w14010048

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