Development of ecofriendly nitrogen removal system by hybrid bacterial denitrification activity for the usage in developing countries

2016 Fiscal Year Final Research Report

• Project/Area Number: 26340059
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Environmental engineering and reduction of environmental burden
• Research Institution: University of Yamanashi
• Principal Investigator: KAZAMA Futaba 山梨大学, 総合研究部, 教授 (00115320)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 窒素除去 / 水処理 / 水素酸化脱窒 / 複合微生物脱窒処理 / マイクロバブル

Outline of Final Research Achievements

Especially in developing countries, nitrate contamination of groundwater has become a serious issue affecting the quality of drinking water and health. For development of ecofriendly simple reactor to remove nitrate via hydrogenotrophic denitrification (HD), an intermittent hydrogen supply or a usage of hydrogen microbubble were tried to improve the hydrogen effectiveness and the reduction of treatment cost. Using a cycle with a short period of hydrogen supply or a hydrogen microbubble supply, the excellent nitrogen removal efficiency (96%) was achieved. Furthermore, Hydrogenophaga spp., which is well known as HD bacteria, was dominant under the continuous hydrogen supply system, whereas Thauera spp. were the most abundant species in the effective reactor with reduction of hydrogen supply amount. These results support strongly the existence of the hybrid bacterial denitrification activity in HD reactor and might be important information to develop a new HD treatment system.

Free Research Field

環境学