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Publication informationDesalination, 271 (1-3): 150-156Publisher Elsevier

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This study has served as more encouraging signs that constructed wetlands (CWs) can incorporate microbial fuel cells (MFCs) into their design to produce electrical energy while treating wastewater. Two 3.7 L CW-MFCs have been constructed to treat swine wastewater with one (System 1) operated in batch mode while the other (System 2) was operated in continuous, upward flow mode and incorporated air diffusion heads to aerate the cathode.

Publication informationProcess Biochemistry, 46 (1) In this study, beneficial reuse of the alum-contained drinking water treatment sludge is 14 extended into developing a novel constructed wetland system (CWs) using the alum 15 sludge as main substrate. The study reports on the first pilot field-scale alum sludge-based 16CWs operated in the tidal flow mode with enhanced capacity for phosphorus and organic 17 matter removal from animal farm wastewater. The concept of the development is 18 presented and this is followed by the performance analysis of the first CWs of its kind. 19The CWs consists of four identical compartments in series operated using a tidal flow 20 strategy with a hydraulic loading rate of 0.29 m 3 /m 2 .d. First year analysis of the system's 21 performance shows that it is a unique and promising low-cost wastewater treatment 22 system. The mean monthly removal efficiencies obtained was determined to range from 23 57%-84%, 36%-84%, 11%-78%, 49%-93%, 75%-94%, 73%-97% and 46%-83% for 24 BOD 5 , COD, TN, NH 4 -N, TP, P (inorganic phosphorus) and SS. The system showed a 25 distinct phosphorus removal and also, the system was effective in reducing levels of 26 organics and ammonium-nitrogen. More importantly, the system showcases a novel reuse 27 alternative for the alum sludge as opposed to its landfilling, demonstrating a win-win 28 technique with a great potential for larger-scale application. 29 30

A new development on treatment wetland technology for the purpose of achieving high rate nitrogen removal from high strength wastewater has been made in this study. The laboratory scale alum sludge-based intermittent aeration constructed wetland (AlS-IACW) was integrated with predenitrification, intermittent aeration, and step-feeding strategies. Results obtained from 280 days of operation have demonstrated extraordinary nitrogen removal performance with mean total nitrogen (TN) removal efficiency of 90% under high N loading rate (NLR) of 46.7 g N m–2 d–1. This performance was a substantial improvement compared to the reported TN removal performance in literature. Most significantly, partial nitrification and simultaneous nitrification denitrification (SND) via nitrite was found to be the main nitrogen conversion pathways in the AlS-IACW system under high dissolved oxygen concentrations (3–6 mg L–1) without specific control. SND under high dissolved oxygen (DO) brings high nitrogen conversion rates. Partial nitrification and SND via nitrite can significantly reduce the demand for organic carbon compared with full nitrification and denitrification via nitrate (up to 40%). Overall, these mechanisms allow the system to maintaining efficient and high rate TN removal even under carbon limiting conditions.

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