Formation of Granules with High Phosphorus Content to Realize Efficient Phosphorus Recovery from Waste Activated Sludge by Using Anaerobic Digestion Followed by Aerobic Granulation Technology

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K00599
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Environmental conscious materials and recycle
• Research Institution: University of Tsukuba
• Principal Investigator: LEI Zhongfang 筑波大学, 生命環境系, 准教授 (30634505)
• Co-Investigator(Kenkyū-buntansha): 張 振亜 筑波大学, 生命環境系, 教授 (20272156)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: リン回収 / 好気性グラニュール化 / 廃棄活性汚泥 / 熱水前処理 / 嫌気性消化

Outline of Final Research Achievements

Phosphorus (P) as a non-renewable resource plays important roles in agricultural and industrial activities. Japan is the 8th largest P consumption nation with all the P resources being imported from other countries. This project investigated the feasibility of P-rich granules production from waste activated sludge by combining hydrothermal pretreatment, anaerobic digestion and aerobic granulation. Results show that hydrothermal treatment can be a cost-effective process when the treatment temperature and duration are optimized according to the energy balance of enhanced methane production from the pretreated waste activated sludge. P-rich granules (6-10%) with P bioavailability up to 95% could be successfully cultivated using synthetic digestate or wastewater.

Free Research Field

持続環境学