CHAIBao-hua,WANGYue-ning,HUANGXiao-zhong,et al.Impact of Temperature on Treatment of Low Nitrogen Concentration Wastewater Using an Anammox Biofilter[J].China Water & Wastewater,2025,41(7):89-94.
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Impact of Temperature on Treatment of Low Nitrogen Concentration Wastewater Using an Anammox Biofilter

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第41卷 Number: 第7期 Page: 89-94 Column: Date of publication: 2025-04-01
Author(s):
CHAI　Bao-hua1;  WANG　Yue-ning2;  HUANG　Xiao-zhong2;  GAO　Li-juan1;  ZHUANG　Peng-yu1;  KOU　Xiao-mei1;  LI　Wen-tao1;  WANG　Yi2
（1. PowerChina Northwest Engineering Corporation Limited， Xi’an 710065， China； 2. School of Environmental and Municipal Engineering， Xi’an University of Architecture and Technology， Xi’an 710055， China）
Keywords:
Anammox biofilter reactor;  temperature;  adaptation period;  Anammox activity;  low nitrogen concentration wastewater
Abstract:
The nitrogen removal performance of an Anammox biofilter reactor(ABFR) during a temperature gradient decrease was evaluated. The impact of varying temperatures on water quality and activity of Anammox along the flow path was investigated. Additionally, the microbial community of functional microorganisms within the ABFR at a stable temperature of (22±1) ℃ was analyzed. Under the conditions of influent NH4+-N of (47±3) mg/L, NO2--N of (53±4) mg/L, hydraulic retention time （HRT） of 1.5 hours, and nitrogen loading rate of 1.62 kg/(m3·d), the total nitrogen removal efficiency stabilized at over 86%, and the ammonia nitrogen and total nitrogen in the effluent complied with the limits specified in the discharge standard when the temperature was stepwise dropped from (31±1) ℃ to (22±1) ℃ in the ABFR. However, the adaptation period and specific Anammox activity (SAA) of the reactor exhibited significant variations at different temperatures. Specifically, as the temperature decreased, the SAA also diminished, consequently prolonging the adaptation period. At a temperature of (22±1) ℃, the SAA(calcultated by N) was approximately 0.84 mg/(gVSS·h), with an adaptation period of 36 days. The dominant Anammox bacteria were Candidatus Brocadia and Candidatus Jettenia, which exhibited strong adaptability to temperature variations. In conclusion, the ABFR demonstrated the capability to mitigate the adverse effects of temperature drop on the system and achieved a stable and high total nitrogen removal efficiency at temperature of (22±1) ℃. This makes it a promising Anammox treatment device for low nitrogen concentration wastewater.
Last Update: 2025-04-01