Advance nitrogen removal from anaerobic sludge digestion liquor using partial nitrification and denitrification
Yue Zhou1, Chao Wang2, Xiaochen Xu1
1Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environment Science and Technology, Dalian University of Technology, Ling Gong Road 2, Dalian 116024, PR China.
Abstract:
A novel two-stage continuous-flow partial nitrification and denitrification coupled with simultaneous partial nitrification, anammox, and denitrification (PND-SNAD) process was developed to treat anaerobic sludge digestion liquor. During the stable phase, the total nitrogen and chemical oxygen demand (COD) removal efficiencies were 93 ± 3 % and 59 ± 7 %, respectively. Free ammonia suppression (26.2 ± 12.7 mg/L) and low dissolved oxygen (DO, 0.12 ± 0.07 mg/L) were key factors in the operation of the PND process, while the SNAD process was restricted successfully by limited oxygen (DO < 0.1 mg/L) and short solids retention time (9.7 d). The PND process was an important pretreatment process that could remove biodegradable dissolved COD by denitrification and supply ammonium-oxidizing bacteria (AOB) to the SNAD process. Nitrosomonas and Ca. Brocadia were the dominant AOB and anammox bacteria, respectively. Overall, this research presents a distinctive SNAD combined process for anaerobic sludge digestion liquor treatment.
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