Application of Mercury-Free Film Type Ultraviolet Light Source to Low Transmittance Wastewater.

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K12390
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 64020:Environmental load reduction and remediation-related
• Research Institution: Osaka Sangyo University
• Principal Investigator: Takanami Ryohei 大阪産業大学, デザイン工学部, 准教授 (00440933)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 紫外線分解 / 紫外線殺菌 / 排水処理 / 水銀フリー / 枯草菌 / PPCPs / 促進酸化 / 高度処理

Outline of Final Research Achievements

In this study, we investigated the possibility of UV treatment for low transmittance wastewater using a new light source without mercury. Based on the research results, sterilization and decomposition of organic matter in low-transmittance wastewater can be sufficiently treated by estimating the irradiation energy of ultraviolet rays required from the transmittance of wastewater. Although it was confirmed that the water pipe of the reactor could be made of resin in order to improve the portability of the equipment and to reduce the introduction cost, it is necessary to improve the heat resistance of the resin pipe. The omnidirectional irradiation, in which the ultraviolet irradiation is performed externally from the outside of the water pipe, is effective. It was clarified that the condition of the multistage irradiation which shifts from UVA to VUV to the light source of short wavelength was effective for the molecular weight degradation of polymer organic substance.

Free Research Field

環境工学

Academic Significance and Societal Importance of the Research Achievements

本水処理システムは、処理が困難な下・排水の環境リスク低減技術として社会的意義が大きく、排水処理コストの低減につながれば畜産業界等へのインパクトも大きい。さらに水銀フリーであること、塩素の使用を軽減できるなど、安全性が高く、持続可能かつ環境負荷が少ない処理システムとして経済的・社会的価値創出の期待に応えられるものであり、紫外線照射による次世代の高度な下・排水処理技術開発の有益な資料になると考える。