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Niwa T.,Meiden Singapore Pte Ltd | Niwa T.,Nagaoka University of Technology | Hatamoto M.,Nagaoka University of Technology | Yamashita T.,Meiden Singapore Pte Ltd | And 7 more authors.
Bioresource Technology | Year: 2016

This study comprehensively evaluated the performance of a full-scale plant (4550 m3 d-1) using a UASB reactor followed by a ceramic MBR for the reclamation and reuse of mixed industrial wastewater containing many inorganics, chemical, oil and greases. This plant was demonstrated as the first full-scale system to reclaim the mixed industrial wastewater in the world. During 395 days of operation, influent chemical oxygen demand (COD) fluctuated widely, but this system achieved COD removal rate of 91% and the ceramic MBR have operated flux of 21-25 LMH stably. This means that this system adsorbed the feed water fluctuation and properly treated the water. Energy consumption of this plant was achieved 0.76 kWh mm-3 and this value is same range of domestic sewage MBR system. The combination of an UASB reactor and ceramic MBR is the most economical and feasible solution for water reclamation of mixed industrial wastewater. © 2016 Elsevier Ltd. Source


Yanhong Z.,Meiden Singapore Pte Ltd | Kazuya O.,Meiden Singapore Pte Ltd | Oi K.,Meidensha
2014 International Power Electronics Conference, IPEC-Hiroshima - ECCE Asia 2014 | Year: 2014

A high efficiency 3-phase hybrid 7-level inverter is presented in this paper. Compared with traditional hybrid 7-level converters, the proposed topology and its T-type cell have lower power loss and simple configuration. It can be easily implemented and applied in renewable energy areas. In the paper, power loss of proposed T-type cell is analyzed, by which conduction loss of T-type cell is proved to be lower than commonly used H-bridge. Therefore, it can be considered to replace H-bridge as a higher efficiency approach in many multi-level topologies. Due to single DC source proposed, DC voltage control scheme for auxiliary inverters is also discussed and presented. A comparison study is carried out by MATLAB + PLECS simulation platform in a grid-connected system. © 2014 IEEE. Source

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