EFFECTS OF LOW TEMPERATURE ON PARTIAL NITRIFICATION GRANULAR SYSTEM

BAO Yi; SONG Jia-jun; YIN Fang-fang; ZHANG Yuan-ke; TIAN Wen-li; LI Xin-hui; YANG Chen-qi; LIU Wen-ru; SHEN Yao-liang

doi:10.13205/j.hjgc.202012006

Volume 38 Issue 12

Apr. 2021

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2020 > 38(12): 32-37,44

BAO Yi, SONG Jia-jun, YIN Fang-fang, ZHANG Yuan-ke, TIAN Wen-li, LI Xin-hui, YANG Chen-qi, LIU Wen-ru, SHEN Yao-liang. EFFECTS OF LOW TEMPERATURE ON PARTIAL NITRIFICATION GRANULAR SYSTEM[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(12): 32-37,44. doi: 10.13205/j.hjgc.202012006

Citation:

BAO Yi, SONG Jia-jun, YIN Fang-fang, ZHANG Yuan-ke, TIAN Wen-li, LI Xin-hui, YANG Chen-qi, LIU Wen-ru, SHEN Yao-liang. EFFECTS OF LOW TEMPERATURE ON PARTIAL NITRIFICATION GRANULAR SYSTEM[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(12): 32-37,44. doi: 10.13205/j.hjgc.202012006

Citation:

BAO Yi, SONG Jia-jun, YIN Fang-fang, ZHANG Yuan-ke, TIAN Wen-li, LI Xin-hui, YANG Chen-qi, LIU Wen-ru, SHEN Yao-liang. EFFECTS OF LOW TEMPERATURE ON PARTIAL NITRIFICATION GRANULAR SYSTEM[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(12): 32-37,44. doi: 10.13205/j.hjgc.202012006

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EFFECTS OF LOW TEMPERATURE ON PARTIAL NITRIFICATION GRANULAR SYSTEM

doi: 10.13205/j.hjgc.202012006

1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;
2. Suzhou Jing Yan Environmental Protection Technology Co., Ltd, Suzhou 215009, China;
3. National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology, Suzhou 215009, China;
4. Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou 215009, China

Received Date: 2020-02-28
Available Online: 2021-04-23

Abstract

Abstract

The long-and short-term effects of temperature change on partial nitrification granules was investigated. The results showed that nitrite accumulation efficiency and ammonium removal loading rates of the granular reactor were stably maintained at above 95% and 0.18~0.25 kg/(m³·L), when treating the influent of (35.8±5.2) mg/L with hydraulic retention time of 2.0 h at 7~17 ℃. The low DO/NH₄⁺-N ratio (<0.25) caused the efficient nitrite oxidizing bacteria (NOB) repression in the granular reactor. Though the lowering temperature caused the decrease of specific ammonia oxidation rates (SAOR) of partial nitrification granules from (237±14) g/(g·d) (at 17 ℃) to (93±11) g/(g·d) (at 8 ℃), the active AOB ratio (the ratio between actual SAOR and maximal SAOR of granules) increased from 48% to 85%. Batch tests results indicated that the temperature coefficient (θ) and activation energy (E_a) of the ammonia oxidizing bacteria (AOB) living in the granules was around 1.042~1.063, 29.7~41.9 kJ/mol respectively from 7.1 ℃ to 28 ℃, which were lower than that reported in flocculent sludge systems. These results suggested that the AOB living in the granules were less influenced by low temperatures than that living in the flocs. The research could provide practical support for the development of high-rate nitritation technology for municipal wastewater treatment with granular sludge.
- granular sludge,
- nitritation,
- temperature effect,
- activation energy

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