Title: Application of nitrifying granules to improvement of nitrification activity in activated sludge process

Authors: Naohiro Kishida, Ryo Totsuka, Atsushi Kono, Mikiya Kurasawa, Motoki Ogiwara, Satoshi Tsuneda

Addresses: Department of Water Supply Engineering, National Institute of Public Health, 2-3-6 Minami, Wako, Saitama 351-0197, Japan. ' Department of Chemical Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan. ' Department of Chemical Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan. ' Department of Chemical Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan. ' Department of Chemical Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan.' Department of Life Science and Medical Bio-Science, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan

Abstract: Nitrifying granules were used to improve nitrification performance of activated sludge process under high organic load. After inoculation of nitrifying granules, nitrification activity immediately increased, and kept for at least 70 days. Fluorescence in situ hybridisation analysis confirmed that nitrifying bacteria were retained in the granules even though nitrifying granules had been served in the organic wastewater treatment reactor for 70 days. Nitrification performance strongly depended on C/N ratio of the influent wastewater. Nitrifying granules that had been statically stored for 100 days could completely recover ammonia removal rate within 15 days after inoculation to ammonia-rich solution.

Keywords: aerobic granules; bioaugmentation; biological nitrogen removal; aerobic granulation; microbial immobilisation; nitrification; nitrifying granules; wastewater treatment; activated sludge; ammonia removal rate.

DOI: 10.1504/IJEWM.2011.037370

International Journal of Environment and Waste Management, 2011 Vol.7 No.1/2, pp.103 - 111

Published online: 05 Dec 2010 *

Full-text access for editors Access for subscribers Purchase this article Comment on this article