Activated sludge under free ammonia treatment using gel immobilization technology for long-term partial nitrification with different initial biomass |
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| Institution: | 1. Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China;2. China Wuzhou Engineering Group Corporarion LTD, China;1. Department of Biochemistry and Clinical Laboratory, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran;2. Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran;3. Student Research Committee and Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran;1. University of Alberta, Department of Civil and Environmental Engineering, Edmonton, Alberta, T6G 1H9, Canada;2. EPCOR Water Services Inc, Edmonton, Alberta, Canada;1. School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, PR China;2. National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, PR China;3. Institute of Marine Science and Technology, Shandong University, Qingdao 266237, PR China;1. School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China;2. Joint Research Centre for Protective Infrastructure Technology and Environmental Green Bioprocess, School of Environmental and Municipal Engineering, Tianjin 300384, China;3. Tianjin Key Laboratory of Aqueous Science and Technology, Tianjin 300384, China;4. Graduate School of Environmental Studies, Tohoku University, 6-6-06 Aza-Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-857, Japan |
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| Abstract: | To achieve stable partial nitrification, activated sludge from a wastewater treatment plant using free ammonia (FA) inhibition was immobilized in a polyvinyl alcohol carrier. After FA treatment at 16.44 mg L−1 for 1 day, due to the increased growth rate gap between ammonium-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB), AOB enrichment and NOB inhibition were achieved within 12 days, with AOB and NOB accounting for 65.61 and 0.05%, respectively. Subsequently, with dissolved oxygen concentrations of 4−5 mg L−1, pH of 7.6–7.8 and temperature of 25 ± 1 °C, the immobilized carrier made of activated sludge achieved more than 90% and more than 86% of nitrite accumulation rate at the influent ammonia concentration of 90−110 mg L−1 and 35−50 mg L−1, respectively. After 50 days operation, the NOB content was 0.10%, indicating the immobilized carrier provided favorable conditions for maintaining the low NOB content. Furthermore, due to the low NOB content in the inoculum and the oxygen-limited environment formed by the increase in the AOB numbers in the carrier, immobilized carrier with different initial biomass (1, 2.5 and 5%) can achieve stable partial nitrification. |
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| Keywords: | Free ammonia Growth rate Immobilized carrier Microbial community structure Partial nitrification |
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