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DOI: https://doi.org/10.4491/eer.2020.617
Performance and kinetic modeling of modified attached-growth anoxic-oxic-anoxic reactor for onsite sanitation system treating septic tank effluent
Thammarat Koottatep1, Sittikorn Kamngam1, Chawalit Chaiwong1, and Chongrak Polprasert2
1Environmetal Engineering and Management, School of Environment, Resources and Development, Asian Institute of Technology, Pathumthani, 12120, Thailand
2Department of Civil Engineering, Faculty of Engineering, Thammasat University, Pathumthani, 12120, Thailand
Corresponding Author: Sittikorn Kamngam ,Tel: +66832830309 , Email: sittikornkam@gmail.com
Received: November 9, 2020;  Accepted: March 29, 2021.
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ABSTRACT
This paper investigated a combined process of a modified attached-growth anoxic-oxic-anoxic reactor (AG-AOAR) as a sustainable and effective post-treatment system for septic tank effluent was developed. The AG-AOAR was operated by varying hydraulic retention times (HRTs) from 24 to 72 h. The results showed that the AG-AOAR achieved highest removal efficiencies of 84, 66 and 91% of chemical oxygen demand (COD), total nitrogen (TN) and ammonium nitrogen (NH4-N), respectively, under the HRT of 72 h, resulting its effluent meeting the international and national discharge quality standards for non-sewered sanitation system. The Stover-Kincannon model was applicable to describe the kinetic constants of COD, TN, and NH4-N removal in the AG-AOAR (R2 > 0.85). Accordingly, the maximum utilization rates (μmax) were determined to be 41.1, 0.15 and 0.50 g/(L-d) for COD, TN and NH4-N removals, respectively, while the saturation constants (KB) were 57.7, 0.12 and 0.51 g/(L-d), respectively. These constant values could be applied for the design of the AG-AOAR to produce treated effluent meeting desired standards.
Keywords: Attached-growth | Anoxic-oxic-anoxic | Septic tank effluent | Stover-Kincannon model
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