Comprehensive analysis of step-feeding strategy to enhance biological nitrogen removal in alum sludge-based tidal flow constructed wetlands

Abstract

Publication informationBioresource Technology, 111 (May 2012): 27-35Publisher Elsevier Item record/more information http://hdl.handle.net/10197/4021 Publisher's statementThis is the author's version of a work that was accepted for publication in Bioresource Technology resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. is the main nitrogen conversion mechanism. The optimal influent distribution fraction for 2 step-feeding purpose can be estimated from a theoretical basis, which is a function of the influent BCOD/TKN ratio. Therefore the influent distribution fraction should be adjusted according to the variety of influent characteristics, rather than a fixed value.

Enhanced nitrogen removal in constructed wetlands: Effects of dissolved oxygen and step-feeding

“…All the system demonstrated satisfactory removal of COD and NH 4 + -N, and COD and NH 4 + -N removal were depended strongly on the types of HSFCWs, step-feeding and the interaction between them, except NH 4 + -N did not depend on the interaction between types of HSFCWs and step-feeding. Average COD removal efficiencies were all above 80% except for HSFCW2 (67.8%), indicating that high COD removal could be guaranteed with artificial aeration (Fan et al, 2013a;Hu et al, 2012b). Moreover, the artificial aeration also promoted NH 4 + -N removal.…”

“…HSFCWs. Until recently, some studies was carried to investigate step-feeding in improving TN removal in vertical flow CWs (Hu et al, 2012b;Fan et al, 2013a), nevertheless, the effect of stepfeeding on TN removal in HSFCWs are remained unclear, and the combination of aeration and step-feeding on nitrogen removal process has rarely been reported anywhere. Therefore, it is quite necessary to qualify and evaluate the combined effect of aeration and step-feeding in HSFCWs on nitrogen removal.…”

Potential Alternative Reuse Pathways for Water Treatment Residuals: Remaining Barriers and Questions—a Review

“…This resulted in average removal rates of 90.1%, 23.3%, 86.1%, and 97.2% of COD, NH 4 -N 4 , TN and TP respectively. In another study, Hu et al (2012) achieved an increased N removal rate of 83% under a high nitrogen load (19.1 g N m −2 day −1 ) by means of a step feeding strategy in a tidal fed WTR CW, compared to 23-59% in earlier tidal fed WTR-based CWs. More recently, the incorporation of microbial fuel cells into WTR-based CWs has been investigated in several studies (Zhao et al 2013b;Doherty et al 2015;Xu et al 2016a) (Table 6).…”

Association of robust nitrogen removal with spatiotemporal nitrifying bacterial community dynamics in a new bioreactor for treatment of simulated livestock wastewater with high ammonia content

“…reported that simultaneous nitrification–denitrification by nitrite is the main N conversion pathway under high dissolved oxygen (DO) concentrations in DAS‐based constructed wetland (CW) without specific control . Simultaneous nitrification–denitrification occurs during the first stage of multilevel DAS‐based CW systems . The spatiotemporal compositions of AOB and NOB in DAS–NUA biofilters for the treatment of synthetic livestock wastewater have been determined.…”

“…6 Simultaneous nitrification-denitrification occurs during the first stage of multilevel DAS-based CW systems. 13 The spatiotemporal compositions of AOB and NOB in DAS-NUA biofilters for the treatment of synthetic livestock wastewater have been determined. However, numerous nontarget sequences were identified from the media using polymerase chain reaction (PCR)-denaturing gradient gel electrophoresis.…”