15 results for "Takahiro Watari"
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Journal Article
Enhancing anaerobic syntrophic propionate degradation using modified polyvinyl alcohol gel beads
Modified polyvinyl alcohol (PVA) beads serve as effective anaerobic microbe immobilization carriers. PVA beads were mixed with different conductive materials, activated carbon, magnetite, and green tuff stone powder. In this study, modified PVA beads were used to investigate the effect of using…
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Journal Article
Enhanced methane production from propionate in anaerobic digestion using high-porosity PVAG gel beads embedded with conductive materials
Preventing propionate accumulation is essential for stabilizing methane fermentation. In this study, conductive materials (magnetite, activated carbon, and green tuff) were added to polyvinyl alcohol (PVA) gel beads and increased-porosity gelatin-modified PVA (PVAG) gel beads characterized by…
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Journal Article
Unique gel-like colony forming bacterium Novosphingobium pituita sp. nov., isolated from a membrane bioreactor (MBR) treating sewage
A novel, gelatinous, colony-forming, rod-shaped bacterial strain, designated IK01T was isolated from biofilms formed on the membrane surface of a sewage-treating membrane bioreactor (MBR). Strain IK01T produced gelatinous and almost transparent colonies at lower medium concentrations. Fourier…
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Journal Article
Greenhouse gas reduction of co-benefit-type wastewater treatment system for fish-processing industry: A real-scale case study in Indonesia
This study examined the application of co-benefit-type wastewater treatment technology in the fish-processing industry. Given that there was a dearth of information on fish-processing industrial wastewater in Indonesia, site surveys were conducted. For the entire fish-processing industry throughout…
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Journal Article
Development of down-flow hanging sponge – slow sand filter system as water purification system: Infection risk reduction in an East Africa rural area
Worldwide, many people still drink unpurified water, putting them at risk of contracting waterborne diseases such as diarrhea. In this study, an interview survey was conducted to evaluate the infection risk from the current water supply in rural areas in Kenya. According to the interview, the…
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Journal Article
Optimizing dye wastewater treatment: The impact of operational flux in submerged anaerobic membrane bioreactor
The present study investigated the effect of operational flux on the performance of hollow fiber anaerobic membrane bioreactors (HF-sAnMBR) during treatment of synthetic wastewater containing diazo dye. Two extreme operational flux value, which were 56.92 LMH and 3.21 LMH in reactor 1 (R-1) and…
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Journal Article
Suppression of bacterial wilt disease in Japanese pepper Capsicum annuum L. using compost prepared from sewage sludge containing antagonistic microorganisms
Bacterial wilt disease, caused by Ralstonia solanacearum, occurs due to repeated cultivation of vegetables from the same plant family, creating a condition known as continuous cropping disorder. Beneficial soil microbes, particularly those from the Bacillus genus, are critical in enhancing plant…
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Journal Article
Performance evaluation of downflow hanging sponge–upflow sludge blanket system for Oreochromis niloticus–Brassica oleracea aquaponic system
Maintaining low nitrate concentrations in aquaponic systems is crucial for improving water quality and maximizing the growth efficiency of fish and vegetables. Downflow hanging sponge (DHS) and upflow sludge blanket (USB) reactors have shown potential for wastewater treatment, but their use in…
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Journal Article
Rapid Denitrifying Granular Sludge Formation Methods for Closed-recirculating Seawater Aquaculture System
Denitrification is an important process for water quality control in recirculating aquacultural systems. Denitrifying granular sludge reactors, such as upflow sludge blanket (USB) reactors, can achieve a high NO3∁EN removal efficiency under a short hydraulic retention time. These biological…
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Journal Article
Comparison between Nanosecond Pulse and Direct Current Electrocoagulation for Textile Wastewater Treatment
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)…
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Journal Article
Nitrification characteristics and microbial community changes during conversion of freshwater to seawater in down-flow hanging sponge reactor
In recirculating aquaculture systems (RAS), maintaining water quality in aquaculture tanks is a paramount factor for effective fish production. A down-flow hanging sponge (DHS) reactor, a trickling filter system used for water treatment of RAS that employs sponges to retain biomass, has high…
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Journal Article
Aerobic–anaerobic down-flow hanging reactor for recirculating aquaculture systems: Performance evaluation
Recirculating aquaculture systems (RAS) have gained increasing attention as sustainable alternatives to conventional aquaculture because they reduce water consumption and mitigate environmental impact. However, the accumulation of nitrogen compounds, such as ammonium, nitrite, and nitrate, poses a…
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Journal Article
Evaluation of the process performance of comammox-like nitrospira dominant down-flow hanging sponge reactor with reduced nitrous oxide emissions
Nitrification/denitrification mitigates excess nitrogen in wastewater and reduces nutrient pollution in recipient surface waters but emits substantial amounts of nitrous oxide (N₂O). Complete ammonia-oxidizing (comammox) bacteria provide novel opportunities to mitigate N₂O emissions from wastewater…
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Journal Article
Energy-water usage and greenhouse gas emissions nexus of the natural rubber industry in Vietnam
The natural rubber industry is one of the leading forces in the agro-industry in Vietnam and is expected to expand in response to growing material demands. However, as the industry pursues profit targets, there is also a pressing need to consider its sustainability. One challenge is the lack of…
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Journal Article
Enhanced nitrogen removal in sponge membrane bioreactor coupled with iron scraps for municipal wastewater treatment: Performance and microbial community shifts
This study investigates the performance of a sponge membrane bioreactor (SMBR) integrated with waste iron scraps as an innovative approach to enhance nitrogen removal from municipal wastewater. The incorporation of iron scraps substantially improved the total nitrogen (TN) removal efficiency…