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Start Over Author "Takahiro Watari" Journal journal of water and environment technology
5 results on '"Takahiro Watari"'

1. Comparison between Nanosecond Pulse and Direct Current Electrocoagulation for Textile Wastewater Treatment

Author

Que Ho Nguyen, Takahiro Watari, Takashi Yamaguchi, Yuta Kawamura, Hisayuki Suematsu, Juan Paulo Wiff, Koichi Niihara, and Tadachika Nakayama

Subjects
textile wastewater, nanosecond pulse, electrocoagulation, chemical oxygen demand, specific energy consumption, River, lake, and water-supply engineering (General), TC401-506, Environmental technology. Sanitary engineering, TD1-1066
Abstract

This paper proposes the utilization of a nanosecond pulsed (NSP) power supply in the electrocoagulation (EC) system for textile wastewater treatment. Four aluminum plates arranged in a monopolar-parallel configuration are utilized as electrodes in a 200 ml EC reactor. Chemical oxygen demand (COD) and specific energy consumption (SEC) are utilized to characterize the performance of NSP-powered EC. A DC power supply is considered as a benchmark. Field-emission scanning electron microscopy, X-ray diffraction, and energy-dispersive spectroscopy are utilized to characterize flocs. The results reveal that a maximum COD removal efficiency of 77% can be achieved by utilizing NSP power, while a value of only 60% can be achieved by utilizing DC power. Additionally, NSP power consumes at least 24% less energy than DC power at a similar COD removal efficiency. The utilization of NSP power for textile wastewater treatment allows for high COD removal efficiency with a significantly lower SEC compared to traditional DC-powered EC. It is believed that the low SEC exhibited by NSP power could be useful for promoting the utilization of EC for wastewater treatment and could contribute to the reduction of the carbon footprint of this process.

Published
2020
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2. Comparison between Nanosecond Pulse and Direct Current Electrocoagulation for Textile Wastewater Treatment

Author

Tadachika Nakayama, Koichi Niihara, Yuta Kawamura, Takahiro Watari, Takashi Yamaguchi, Juan Paulo Wiff, Que Ho Nguyen, and Hisayuki Suematsu

Subjects
textile wastewater, Environmental Engineering, Materials science, Textile, Health, Toxicology and Mutagenesis, medicine.medical_treatment, lcsh:River, lake, and water-supply engineering (General), Electrocoagulation, lcsh:TD1-1066, chemical oxygen demand, medicine, lcsh:Environmental technology. Sanitary engineering, Waste Management and Disposal, Water Science and Technology, nanosecond pulse, lcsh:TC401-506, business.industry, Ecological Modeling, Direct current, Nanosecond pulse, Pulp and paper industry, Pollution, specific energy consumption, electrocoagulation, Sewage treatment, business
Abstract

This paper proposes the utilization of a nanosecond pulsed (NSP) power supply in the electrocoagulation (EC) system for textile wastewater treatment. Four aluminum plates arranged in a monopolar-parallel configuration are utilized as electrodes in a 200 ml EC reactor. Chemical oxygen demand (COD) and specific energy consumption (SEC) are utilized to characterize the performance of NSP-powered EC. A DC power supply is considered as a benchmark. Field-emission scanning electron microscopy, X-ray diffraction, and energy-dispersive spectroscopy are utilized to characterize flocs. The results reveal that a maximum COD removal efficiency of 77% can be achieved by utilizing NSP power, while a value of only 60% can be achieved by utilizing DC power. Additionally, NSP power consumes at least 24% less energy than DC power at a similar COD removal efficiency. The utilization of NSP power for textile wastewater treatment allows for high COD removal efficiency with a significantly lower SEC compared to traditional DC-powered EC. It is believed that the low SEC exhibited by NSP power could be useful for promoting the utilization of EC for wastewater treatment and could contribute to the reduction of the carbon footprint of this process.

Published
2020

3. Evaluation of Pretreatment Effect for Spent Mushroom Substrate on Methane Production

Author

Hirofumi Hara, Takahiro Watari, Takashi Yamaguchi, Masayoshi Yamada, Shoji Ikeda, Masahito Yamauchi, Shinya Maki, and Masashi Hatamoto

Subjects
Mushroom, Energy recovery, Environmental Engineering, Chemistry, Health, Toxicology and Mutagenesis, Ecological Modeling, Lignocellulosic biomass, Substrate (chemistry), Pollution, Methane fermentation, Chemical engineering, Methane production, Waste Management and Disposal, Water Science and Technology
Published
2019

4. Anaerobic Baffled Reactor in Treatment of Natural Rubber Processing Wastewater: Reactor Performance and Analysis of Microbial Community

Author

Masao Fukuda, Kazuaki Syutsubo, Phuong Thao Tran, Takashi Yamaguchi, Masashi Hatamoto, Lan Huong Nguyen, Daisuke Tanikawa, Minh Tan Nguyen, Thi Thanh Nguyen, Takahiro Watari, and Yuga Hirakata

Subjects
0301 basic medicine, Environmental Engineering, Health, Toxicology and Mutagenesis, Ecological Modeling, 010501 environmental sciences, Pulp and paper industry, 01 natural sciences, Pollution, 03 medical and health sciences, 030104 developmental biology, Natural rubber, Microbial population biology, Wastewater, visual_art, visual_art.visual_art_medium, Anaerobic treatment, Environmental science, Waste Management and Disposal, Anaerobic exercise, 0105 earth and related environmental sciences, Water Science and Technology
Published
2017

5. Development of UASB-DHS System for Treating Industrial Wastewater Containing Ethylene Glycol

Author

Akinobu Nakamura, Masashi Hatamoto, Takashi Yamaguchi, Fujii Nanako, Yoneyama Fuminori, Daisuke Tanikawa, Takahiro Watari, Osamu Wakisaka, and Kyohei Kuroda

Subjects
Environmental Engineering, Waste management, Health, Toxicology and Mutagenesis, Ecological Modeling, Chemical oxygen demand, Pollution, Methane, Industrial wastewater treatment, chemistry.chemical_compound, chemistry, Wastewater, Sewage treatment, Waste Management and Disposal, Ethylene glycol, Water Science and Technology
Published
2015

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