Removal of organics and nutrients from food wastewater using combined thermophilic two-phase anaerobic digestion and shortcut biological nitrogen removal

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• 作者：Fenghao  ; Cui ;   ; ^{choibongho7@naver.com} ; Seungho  ; Lee ;   ; ^{giantkill@hanyang.ac.kr} ; Moonil  ; Kim  ; ;   ; ^{moonilkim@hanyang.ac.kr}
• 关键词：Two-phase anaerobic digestion ; Shortcut biological nitrogen removal ; Food wastewater ; Pilot plant ; C/N ratio
• 刊名：Water Research
• 出版年：2011
• 出版时间：15 October 2011
• 年：2011
• 卷：45
• 期：16
• 页码：5279-5286
• 全文大小：569 K

文摘

A process combining pilot-scale two-phase anaerobic digestion and shortcut biological nitrogen removal (SBNR) was developed to treat organics and nutrients (nitrogen and phosphorus) from food wastewater. The thermophilic two-phase anaerobic digestion process was investigated without adjusting the pH of the wastewater for the pre-acidification process. The digested food wastewater was treated using the SBNR process without supplemental carbon sources or alkalinity. Under these circumstances, the combined system was able to remove about 99 % of COD, 88 % of TN, and 97 % of TP. However, considerable amounts of nutrients were removed due to chemical precipitation processes between the anaerobic digestion and SBNR. The average TN removal efficiency of the SBNR process was about 74 % at very low C/N (TCOD/TN) ratio of 2. The SBNR process removed about 39 % of TP from the digested food wastewater. Conclusively, application of the combined system improved organic removal efficiency while producing valuable energy (biogas), removed nitrogen at a low C/N ratio, and conserved additional resources (carbon and alkalinity).