Novel online monitoring and alert system for anaerobic digestion reactors

Fang Dong, Quan Bao Zhao, Wen Wei Li, Guo Ping Sheng, Jin Bao Zhao, Yong Tang, Han Qing Yu, Kengo Kubota, Yu You Li, Hideki Harada

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


Effective monitoring and diagnosis of anaerobic digestion processes is a great challenge for anaerobic digestion reactors, which limits their stable operation. In this work, an online monitoring and alert system for upflow anaerobic sludge blanket (UASB) reactors is developed on the basis of a set of novel evaluating indexes. The two indexes, i.e., stability index S and auxiliary index a, which incorporate both gas- and liquid-phase parameters for UASB, enable a quantitative and comprehensive evaluation of reactor status. A series of shock tests is conducted to evaluate the response of the monitoring and alert system to organic overloading, hydraulic, temperature, and toxicant shocks. The results show that this system enables an accurate and rapid monitoring and diagnosis of the reactor status, and offers reliable early warnings on the potential risks. As the core of this system, the evaluating indexes are demonstrated to be of high accuracy and sensitivity in process evaluation and good adaptability to the artificial intelligence and automated control apparatus. This online monitoring and alert system presents a valuable effort to promote the automated monitoring and control of anaerobic digestion process, and holds a high promise for application.

Original languageEnglish
Pages (from-to)9093-9100
Number of pages8
JournalEnvironmental Science & Technology
Issue number20
Publication statusPublished - 2011 Oct 15


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