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Environmental Engineering Research 2020;25(1): 1-17. DOI: https://doi.org/10.4491/eer.2018.334
A review of anaerobic digestion systems for biodegradable waste: Configurations, operating parameters, and current trends
Dinh Pham Van1  , Takeshi Fujiwara1, Bach Leu Tho2, Pham Phu Song Toan1,3, and Giang Hoang Minh2
1Okayama University, 3-1-1 Tsushima, Kita Ward, Okayama 700-8530, Japan
2National University of Civil Engineering, 55 Giai Phong Road, Hai Ba Trung District, Ha Noi, Vietnam
3The University of Da Nang - University of Technology and Education, 48 Cao Thang, Hai Chau District, Da Nang City, Vietnam
Corresponding Author: Dinh Pham Van ,Tel: +81-86-251-8994, Fax: +81-86-251-8994, Email: dinh88.nuce@gmail.com
Received: September 20, 2018;  Accepted: January 30, 2019.
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With benefits to the human health, environment, economy, and energy, anaerobic digestion (AD) systems have attracted remarkable attention within the scientific community. Anaerobic digestion system is created from (bio)reactors to perform a series of bi-metabolism steps including hydrolysis/acidogenesis, acetogenesis, and methanogenesis. By considering the physical separation of the digestion steps above, AD systems can be classified into single-stage (all digestion steps in one reactor) and multi-stage (digestion steps in various reactors). Operation of the AD systems does not only depend on the type of digestion system but also relies on the interaction among growth factors (temperature, pH, and nutrients), the type of reactor, and operating parameters (retention time, organic loading rate). However, these interactions were often reviewed inadequately for the single-stage digestion systems. Therefore, this paper aims to provide a comprehensive review of both single-stage and multi-stage systems as well as the influence of the growth factors, operating conditions, and the type of reactor on them. From those points, the advantages, disadvantages, and application range of each system are well understood.
Keywords: Anaerobic digester | Anaerobic digestion systems | Single-stage | Solid waste treatment | Three-stage | Two-stage
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