Influence of COD:N:P Ratio on Nitrogen and Phosphorus Removal in Fixed-Bed Filter
Publication: Journal of Environmental Engineering
Volume 129, Issue 4
Abstract
This study examined the effects of COD:N:P ratio on nitrogen and phosphorus removal in a single upflow fixed-bed filter provided with anaerobic, anoxic, and aerobic conditions through effluent and sludge recirculation and diffused air aeration. A high-strength wastewater mainly made of peptone, ammonium chloride, monopotassium phosphate, and sodium bicarbonate with varying COD, N, and P concentrations (COD: 2,500–6,000, N: 25–100, and P: 20–50 mg/L) was used as a substrate feed. Sodium acetate provided about 1,500 mg/L of the wastewater COD while the remainder was provided by glucose and peptone. A series of orthogonal tests using three factors, namely, COD, N, and P concentrations, at three different concentration levels were carried out. The experimental results obtained revealed that phosphorus removal efficiency was affected more by its own concentration than that of COD and N concentrations; while nitrogen removal efficiency was unaffected by different phosphorus concentrations. At a COD:N:P ratio of 300:5:1, both nitrogen and phosphorus were effectively removed using the filter, with removal efficiencies at 87 and 76%, respectively, under volumetric loadings of and
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 129 • Issue 4 • April 2003
Pages: 285 - 290
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Mar 7, 2001
Accepted: Dec 13, 2001
Published online: Mar 14, 2003
Published in print: Apr 2003
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