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Environ Technol

Title:		Nitrogen dynamics model for a pilot field-scale novel dewatered alum sludge cake-based constructed wetland system
Author(s):		Kumar JL; Zhao YQ; Hu YS; Babatunde AO; Zhao XH;
Address:		"a UCD Dooge Centre for Water Resources Research, School of Civil, Structural and Environmental Engineering , University College Dublin , Newstead, Belfield, Dublin 4 , Ireland"
Journal Title:		Environ Technol
Year:		2015
Volume:		20141003
Issue:		5-Aug
Page Number:		732 - 741
DOI:		10.1080/09593330.2014.960476
ISSN/ISBN:		0959-3330 (Print) 0959-3330 (Linking)
Abstract:		"A model simulating the effluent nitrogen (N) concentration of treated animal farm wastewater in a pilot on-site constructed wetland (CW) system, using dewatered alum sludge cake (DASC) as wetland substrate, is presented. The N-model was developed based on the Structural Thinking Experiential Learning Laboratory with Animation software and is considering organic nitrogen, ammonia nitrogen (NH3) and nitrate nitrogen (NO3-N) as the major forms of nitrogen involved in the transformation chains. Ammonification (AMM), ammonia volatilization, nitrification (NIT), denitrification, plant uptake, plant decaying and uptake of inorganic nitrogen by algae and bacteria were considered in this model. pH, dissolved oxygen, temperature, precipitation, solar radiation and nitrogen concentrations were considered as forcing functions in the model. The model was calibrated by observed data with a reasonable agreement prior to its applications. The simulated effluent detritus nitrogen, NH4-N, NO3-N and TN had a considerably good agreement with the observed results. The mass balance analysis shows that NIT accounts for 65.60%, adsorption (ad) (11.90%), AMM (8.90%) followed by NH4-N (Plants) (5.90%) and NO3-N (Plants) (4.40%). The TN removal was found 52% of the total influent TN in the CW. This study suggested an improved overall performance of a DASC-based CW and efficient N removal from wastewater"
Keywords:		"*Models, Theoretical Nitrogen/*isolation & purification *Nitrogen Compounds *Water Purification *Wetlands Stella adsorption alum-sludge nitrogen system dynamics;"
Notes:		"MedlineKumar, J L G Zhao, Y Q Hu, Y S Babatunde, A O Zhao, X H eng Research Support, Non-U.S. Gov't England 2014/09/03 Environ Technol. 2015 Mar-Apr; 36(5-8):732-41. doi: 10.1080/09593330.2014.960476. Epub 2014 Oct 3"