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Ammoniacal Nitrogen and Organics Removal Modelling in Vertical Flow Wetlands Treating Strong Wastewaters

湿地科学 2013年第4期11卷 421-432页

作者： Tanveer Ferdous Saeed abdullah a1 muyeed Guangzhi Sun Department of Civil Engineering Ahsanullah University of Science and Technology Dhaka Bangladesh School of Engineering and Physical Sciences James Cook University Townsville QLD 4811 Australia)

This paper reports a comparative evaluation between 2 kinetic models for predicting nitrification and biodegradable organics(BOD5)removal rates in 5 vertical flow(VF)wetland systems,that received strong wastewaters(***,textile and municipal effluents).The models were formulated by combining first order and Monod kinetics,with continuous-stirred tank reactor(CSTR)flow *** performance of the 2 models had been evaluated with3 statistical parameters:coefficient of determination(R2),relative root mean square error(RRMSE),and model efficiency(ME).The statistical parameters indicated better performance of the Monod CSTR model(over first order CSTR approach),for correlating ammoniacal nitrogen(NH4+—N)and BOD5removal profiles across VF *** Monod coefficient values(from Monod CSTR model)coincided with greater input NH4+—N and BOD5loading,and experimentally measured removal rate(g/(m2·d))*** trends indicate that NH4+—N and BOD5removals in the VF systems were mainly achieved via biological *** the other hand,the rate constants(from the first order CSTR model)did not exhibit such correlations(of Monod coefficients),elucidating their inefficiencies in capturing overall removal *** interference of organics removal on nitrification process(in VF wetlands)was identified through Monod *** deviation between NH4+—N and BOD5Monod coefficients imply incorporation of both coefficients,for calculating the area of a single VF ***,closer performance of the Monod CSTR model for predicting NH4+—N and BOD5removals indicate its potential application,as a design tool for VF systems.

关键词： CSTR 废物处理技术方法 BOD

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Pollutant removal from municipal wastewater employing baffled subsurface flow and integrated surface flow-floating treatment wetlands

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Journal of Environmental Sciences 2014年第4期26卷 726-736页

作者： Tanveer Saeed abdullah Al-muyeed Rumana Afrin Habibur Rahman Guangzhi Sun Department of Civil Engineering Ahsanullah University of Science and Technology Department of Civil Engineering Bangladesh University of Engineering and Technology School of Engineering and Physical Sciences James Cook University

This article reports pollutant removal performances of baffled subsurface flow, and integrated surface flow-floating treatment wetland units, when arranged in series for the treatment of municipal wastewater in Bangladesh. The wetland units （of the hybrid system） included organic, inorganic media, and were planted with nineteen types of macrophytes. The wetland train was operated under hydraulic loading fluctuation and seasonal variation. The performance analyses （across the wetland units） illustrated simultaneous denitrification and organics removal rates in the first stage vertical flow wetland, due to organic carbon leaching from the employed organic media. Higher mean organics removal rates （656.0 g COD]（***）） did not completely inhibit nitrification in the first stage vertical flow system; such pattern could be linked to effective utilization of the trapped oxygen, as the flow was directed throughout the media by the baffle walls. Second stage horizontal flow wetland showed enhanced biodegradable organics removal, which depleted organic carbon availability for denitrification. The final stage integrated wetland system allowed further nitrogen removal from wastewater, via nutrient uptake by plant roots （along with nitrification）, and generation of organic carbon （by the dead macrophytes） to support denitrification. The system achieved higher E. coli mortality through protozoa predation, E. coli oxidation, and destruction by UV radiation. In general, enhanced pollutant removal efflciencies as demonstrated by the structurally modified hybrid wetland system signify the necessity of such modification, when operated under adverse conditions such as： substantial input organics loading, hydraulic loading fluctuation, and seasonal variation.

关键词： constructed wetlands loading fluctuation media nitrogen organics seasonal variation

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Near-infrared electroluminescence of AlGaN capped InGaN quantum dots formed by controlled growth on photoelectrochemical etched quantum dot templates

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Photonics Research 2022年第1期10卷 33-40页

作者： XIONGLIANG WEI SYED AHMED AL muyeed HAOTIAN XUE ELIA PALMESE RENBO SONG NELSON TANSU JONATHAN J.WIERER,JR. Center for Photonics and Nanoelectronics Department of Electrical and Computer EngineeringLehigh UniversityBethlehemPennsylvania 18015USA School of Electrical and Electronic Engineering The University of AdelaideAdelaideSA 5005Australia Institute for Photonics and Advanced Sensing The University of AdelaideAdelaideSA 5005Australia

Near-infrared electroluminescence of InGaN quantum dots(QDs)formed by controlled growth on photoelectrochemical(PEC)etched QD templates is *** QD template consists of PEC InGaN QDs with high density and controlled sizes,an AlGaN capping layer to protect the QDs,and a GaN barrier layer to planarize the *** transmission electron microscopy(STEM)of Stranski-Krastanov(SK)growth on the QD template shows high-In-content InGaN QDs that align vertically to the PEC QDs due to localized strain.A highAl-content a1_(0.9)Ga_(0.1)N capping layer prevents the collapse of the SK QDs due to intermixing or decomposition during higher temperature GaN growth as verified by *** of low-temperature(830℃)p-type layers is used to complete the p-n junction and further ensure QD ***,electroluminescence shows a significant wavelength shift(800 nm to 500 nm),caused by the SK QDs’tall height,high In content,and strong polarization-induced electric fields.

关键词： AlGaN polarization template

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