Journal
BIORESOURCE TECHNOLOGY
Volume 267, Issue -, Pages 541-549Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.07.084
Keywords
Low-strength ammonium; Nitritation-denitrification; Zeolite; Inorganic carbon; Free ammonia
Funding
- Specialized Applied Technology Research and Development (major) of Guangdong Province [2015B020235013]
- Specialized Applied Science and Technology Research, Development and Major Transformation Project of Guangdong Province [2017B020236004]
- Research Fund Program of Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology [2018K24]
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Stable nitritation for low-strength ammonium wastewater was the key obstacle for cost-effective and low-carbon biological nitrogen removal. A zeolite biological fixed bed (ZBFB) and an anoxic sequencing batch reactor (ASBR) were successfully applied for achieving nitritation-denitrification of low-strength ammonium wastewater by adsorption, biological desorption and denitrification. Based on free ammonia inhibition on biofilm, stable nitrite accumulation could be realized with suitable operational time and aeration in biological desorption. During cycle operation, adsorption effluent NH4+-N kept at 3.0-4.0 mg/L, biological desorption effluent NO2--N maintained at 226.8-243.2 mg/L with average nitrite accumulation ratio of 97.18%, and nitrite removal rate was about 0.628-0.672 kg NO2--N.m(-3).day(-1), revealing obvious feasibility of ZBFB and ASBR for low-strength ammonium wastewater treatment. High-throughput sequencing analysis results further presented significant microbial community variations happened after cycle operation, with ammonia oxidizing bacteria enrichment and nitrite oxidizing bacteria inhibition in ZBFB and dominance of denitrifiers in ASBR.
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