Sequential
high rate algal ponds operation for enhanced treatment
of
organic wastewater
M.
Kishi1*, H. Takee1, M. Kawai1, N. Nagao2
and T. Toda1
1Graduate School of
Engineering, Soka University, 1-236 Tangi-cho, Hachioji, Tokyo 192-8577,
Japan
2Laboratory of Marine
Biotechnology, Institute of Bioscience, Universiti Putra Malaysia, 43400
Serdang, Selangor Darul Ehsan, Malaysia
*Corresponding
Author E-mail: masa-kishi@soka.gr.jp
|
Key
words
algal-bacterial consortium
Algal pond
Aquaculture wastewater
sequential HRAP operation
valorization
Publication Data
Paper received : 09.06.2017
Revised received : 19.09.2017
Accepted : 28.12.2017
|
Abstract
Aim: Treatment of
aquaculture wastewater often experiences fluctuations in chemical oxygen
demand, causing insufficient performances. This study aimed to evaluate the
stability of sequential high rate algal ponds in treating simulated
aquaculture wastewater. ????
Methodology: Two 1m3
high rate algal ponds were sequentially connected to treat simulated
aquaculture wastewater, which was prepared through diluting solubilized food
waste (chemical oxygen demand: 300 mg l-1). The hydraulic
retention time was set at 10 days for each reactor. ?????
Results: More than 80% of
influent organics and nearly 100% of nutrients (ammonium, nitrate, and
phosphate) were removed from the effluent. While the oxygen demand removal in
Pond 1 was incomplete around Day 8, Pond 2 was successful in removing
untreated biodegradable oxygen demand from Pond 1 effluent. In addition, the
sequential HRAP operation reduced bacterial biomass in the algal biomass of
Pond 2 owing to the low organic loading on the second pond.
Interpretation: These results
indicate that sequential HRAP operation has advantages not only in stable
wastewater treatment performance, but also in the valorization of algal
biomass produced through aquaculture wastewater treatment.
|
Copyright
? 2018 Triveni Enterprises. All rights reserved. No part of the Journal can
be reproduced in any form without prior permission. Responsibility
regarding the authenticity of the data, and the acceptability of the
conclusions enforced or derived, rest completely with the author(s).
|