Category Archives: Research

Biological treatment of bioethanol producing wastewater

Bioethanol is renewable energy produced from agricultural feedstock and thus bioethanol has been attracting attention as an alternative fuel for gasoline. However, bioethanol produces massive amount of waste/wastewater during the production process. These waste/wastewater are fermentation waste, distillery waste and … Continue reading

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Sulfur denitrification using sulfur compounds generated from biological desulfurization of biogas for industrial wastewater treatment

Anaerobic treatment of industrial wastewater produces not only useful methane but also highly toxic hydrogen sulfide gas. Especially for the wastewater containing high concentration sulfate, such as wastewater from molasses, natural rubber, and brewery, high concentration of hydrogen sulfide is … Continue reading

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Development of a high sensitive FISH

Recently, the rRNA approach is widely used for revealing a microbial community and opening the unknown microbial world.  In the rRNA approach, fluorescence in situ hybridization (FISH) makes it possible to detect the target cells at single cell resolution.  In … Continue reading

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Elucidate an anaerobic sulfur oxidizing reaction in UASB reactor and utilization for sewage treatment system in low temperature condition

Our laboratory has been developing a sewage treatment system with UASB reactor for warm climate (average temperature: 15℃〜20℃). However, the performance of usual UASB such as organic matter removal decreases in winter because the decline of activities of methanogenic archaea … Continue reading

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Development of methane fermentation system using local biomass resources

The concern for biomass resources has been increasing for global warming and fears of depletion of fossil resources. In Japan, a large amount of biomass resources are expected because of Japan’s temperate rainy climate. Japanese government also promotes the utilization … Continue reading

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Development of Recirculating Nitrogen Removal System for Marine Aquarium

In an aquarium and the aquaculture institution, water management of the breeding water that is the growth environment of the aquatic organism is the most important. In most recirculating systems, ammonia (referring to NH3 and NH4 +) removal by nitrification, … Continue reading

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Exploring for microorganisms that affect bulking of methanogenic sludge granules

Sludge bulking is defined as a phenomenon that sludge granules in a wastewater treatment reactor float on and overflow from the reactor. Sludge bulking cause a decrease of COD removal in a wastewater treatment. Quite interesting sludge bulking was observed … Continue reading

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Development of a nutrients removal process for UASB+DHS system

The energy-saving sewage treatment system of UASB+DHS (Downflow Hanging Sponge) has a remarkable performance for organic removal and nitrification. However, the system showed little ability to remove nitrogen and phosphorus to date. Therefore we are developing an advanced nitrogen and phosphorus … Continue reading

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Development of microbial fuel cells (MFC) for wastewater treatment

Current wastewater treatment technology has some problem concerning the environmental load. For example, the activated sludge process of aerobic wastewater treatment requires the large consumption of electricity and the high excess sludge disposal cost. The methane fermentation process of anaerobic … Continue reading

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