Batch Operation of Biofilter - Free-water Surface Wetland Series for Enhancing Nitritation and Anammox
Abstract:This study compared two series of ecologically engineered treatment systems for nitrogen removal by enhancing nitritation and anammox. Each treatment series had two biofilters followed by one free-water surface (FWS) wetland. The first series included biofilters packed with marble chips and demonstrated a development process in nitrogen removal through the first 26 cycles of weekly batch operation. The series then stabilized at an average ammonium removal rate of 19.2 g N/m3·d and total nitrogen removal rate of 10.6 g N/m3·d during the latest 22 cycles. The second series, which consisted of biofilters packed with pea pebbles, experienced decreasing nitrogen removal rates. Anammox and heterotrophic denitrification accounted for 77% and 23%, respectively, of the total nitrogen removal in the marble biofilters. Nitrogen removal rates in the FWS wetlands increased significantly with ammonium loading rates increasing up to approximately 30 g N/m3·d. Ammonium and total nitrogen removal followed zero-order reaction kinetics. The marble biofilter-wetland series reached an ammonium removal rate of 30.3 g N/m3·d and total nitrogen removal rate of 23.0 g N/m3·d through the latest 22 cycles of batch operation at the average ammonium loading rate of 56.4 g N/m3·d.
Document Type: Research Article
Publication date: 2011-06-01
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Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year. Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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