[H-CG25] Cultural Hydrology

[HCG25-05] Potential of constructed wetlands as phase-free wastewater treatment

★Invited Papers

*Tadashi Toyama¹, Akimasa Miwa¹, Kei Nishida¹ (1.University of Yamanashi)

Keywords:Constructed wetland, Wastewater treatment, Phase-free

Constructed wetlands are recognized as a promising new decentralized wastewater treatment method because their initial construction costs are low, their operation requires little energy and cost, and they are easy to maintain and manage. Constructed wetlands imitate natural ecosystems and are composed of aquatic plants, microorganisms, and filter beds (sand, gravel, gravel, pumice, etc.), and their water purification mechanisms include biological reactions (degradation of organic matters, nitrification, denitrification) by microorganisms, physicochemical filtration and adsorption by filter beds, and purification effects by aquatic plants. Distributed and independent wastewater treatment by constructed wetlands is possible because there is no need for sewage pipes or large-scale infrastructure facilities like in sewer systems, and there is no need for aeration that requires electricity input. Constructed wetland can treat domestic wastewater and sewage treatment under normal and disaster times as phase-free water purification system. In this presentation, we will introduce the wastewater treatment performance and electric energy consumption of constructed wetlands and a demonstration experiment of independent power operation of constructed wetland combining solar panels and storage batteries. Furthermore, we will introduce the possibilities and characteristics of constructed wetlands as a phase-free wastewater treatment.