Process-based modelling of phosphorus removal in a novel constructed wetland system using dewatered alum-sludge as substrate
|Title:||Process-based modelling of phosphorus removal in a novel constructed wetland system using dewatered alum-sludge as substrate||Authors:||Kumar, J.L.G.
|Permanent link:||http://hdl.handle.net/10197/4019||Date:||2011||Abstract:||A process-based model that can evaluate the transport and the fate of phosphorus (P) in agricultural wastewater was developed for a novel 4-stage dewatered alum sludge cakes (DASC) based constructed wetlands (CWs) system using STELLA software (version 9.1.4). The model considered adsorption, plant and microbial uptakes as the major forms of P involved in the transformation chains. The results were obtained by experimental procedure through laboratory measurement, from literature and/or calibration. The observed effluent P concentration in the CWs ranged from 3.62 to 8.50 mg/L (stage 1), 2.00 to 4.45 mg/L (stage 2), 1.39 to 3.76 mg/L (stage 3) and 0.52 to 2.36 mg/L (stage 4), whereas the simulated values ranged from 2.12 to 10.99 mg/L (stage 1), 1.32 to 5.65 mg/L (stage 2), 0.84 to 3.64 mg/L (stage 3) and 0.53 to 2.25 mg/L (stage 4), respectively. The simulated and observed values of P removal in the CWs system were in good agreement. A mass balance analysis was performed for all the major processes which resulted in a major pathway of P removal through adsorption (64–75%, 58–66%, 57–63% and 49–58%) followed by plant uptake (7–11%, 8–14%, 14–17% and 9–19%) and microbial uptake (3–7%, 3–5%, 9–12% and 7–12%) for stage 1, stage 2, stage 3 and stage 4, respectively. Thus the mathematical model developed in this study could be used to explain the removal processes and simulate the fate of P in the DASC-based CWs system.||Type of material:||Journal Article||Publisher:||IWA Publishing||Journal:||Water Science & Technology||Volume:||64||Issue:||3||Start page:||774||End page:||780||Copyright (published version):||2011, IWA Publishing||Keywords:||Alum sludge; Constructed wetlands; Modelling; Phosphorus removal; STELLA||DOI:||10.2166/wst.2011.711||Language:||en||Status of Item:||Peer reviewed|
|Appears in Collections:||Civil Engineering Research Collection|
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