1. Non-submerged attached growth process for domestic wastewater treatment: Influence of media types and internal recirculation ratios.
- Author
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Dang BT, Nguyen TT, Bui XT, Hao Ngo H, Andrew Lin KY, Tomoaki I, Saunders T, Huynh TN, Ngoc-Dan Cao T, Visvanathan C, Varjani S, and Rene ER
- Subjects
- Bioreactors, Nitrification, Nitrogen analysis, Waste Disposal, Fluid, Wastewater
- Abstract
This study is aimed to comprehend the treatment of non-submerged attached growth systems using bio-sponge, bio-cord, and bio-cloth media. Three reactors were set up with internal recirculation ratio of 1 (IR = 1) and similar media surface area. Bio-sponge and bio-cloth reactors showed removal of COD (79 vs. 76%) and NH
4 + -N (78 vs. 73%). While bio-cord treatment was deteriorated due to time-dependent process. Multiple linear regression revealed that alkalinity governed the formation degree of the anaerobic zone in bio-sponges, partially affecting nitrification. Increasing IR from 1 to 3 caused sloughing of the attached biomass and was positively correlated with effluent nitrite nitrogen concentration, indicating the sensitivity of nitrification to spatial distribution effects. In addition, bio-sponge system obtained superior performance at IR of 2 while bio-cloth one might be also an effective media for wastewater treatment if having good durability., (Copyright © 2021 Elsevier Ltd. All rights reserved.)- Published
- 2022
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