Reduced sulfur compounds in gas from construction and demolition debris landfills

Lee, Sue; Xu, Qiyong; Booth, Matthew; Townsend, Timothy G.; Chadik, Paul A.; Bitton, Gabriel

doi:10.1016/j.wasman.2005.10.010

Cited by 96 publications

(71 citation statements)

References 9 publications

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“…In our living environments, various odorants are released from diverse sources or activities including cooking, use of spray products and cosmetics, or painting (Kim and Kim, 2014;Lee et al, 2012;Du et al, 2011;Burbank and Qian, 2008;Frauendorfer and Schieberle, 2008;Ahn et al, 2007;Lee et al, 2006;Wettasinghe et al, 2001). Odorants are very diverse and include various volatile species such as reduced sulfur compounds (RSCs), carbonyl compounds (CCs), volatile fatty acids (VFAs), nitrogenous compounds, and volatile organic compounds (VOCs).…”

Section: Introductionmentioning

confidence: 99%

Performance of Air Fresher System for the Removal of Various Odorants Released from Foodstuffs

Kım¹,

Adelodun²,

Deep³

et al. 2017

Asian J. Atmos. Environ

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The effectiveness of four air fresher (AF) systems was evaluated with respect to their removal efficien cies against offensive odorants. For this purpose, malodorous species were generated by exposing freshly cooked foods emitting odorants with levels moderately above their respective threshold values in a confined room. The deodorization efficiency of the four AF systems was then tested for a period of 30 min by estimating the extent of reduction in odor ant levels after the operation of each AF. The removal efficiency of the four AF units against each odorant was evaluated as follows: (1) between AF products from different manufacturers, (2) between odorants and ultrafine particulate matter (PM 2.5 ), and (3) be tween operation and natural degassing. The average sorptive removal of odorants was generally <80% and considered less effective or noneffective rela tive to PM 2.5 . Further examination of odor reduction, if evaluated in terms of odor indices like odor inten sity (OI) and odor activity value (OAV), recorded a mean of 33% and 87%, respectively. The overall results of this study confirmed that all tested AF units were not effective to resolve odor problems created under our testing conditions.

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Section: Introductionmentioning

confidence: 99%

Performance of Air Fresher System for the Removal of Various Odorants Released from Foodstuffs

Kım¹,

Adelodun²,

Deep³

et al. 2017

Asian J. Atmos. Environ

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“…Hydrogen sulfide (H 2 S) gas is generated at landfill sites globally [1][2][3][4][5][6]. The inhalation of H 2 S gas at 750-1000 ppm causes abrupt physical collapse [7] (hereafter, H 2 S exceeding 1000 ppm is called H 2 S high ).…”

Section: Introductionmentioning

confidence: 99%

“…died of exposure to 15000 ppm H 2 S gas. H 2 S gas is produced at a landfill when sulfate-reducing bacteria (SRB) consume organic matter and convert sulfate (SO 4 ) under anaerobic conditions [1,8,9]. The source of SO 4 in construction and demolition debris is predominantly gypsum (CaSO 4 ) [10].…”

Section: Introductionmentioning

confidence: 99%

Suppressing Hydrogen Sulfide Generation by Nitrate or Oxygen Addition in Column Percolation Experiment

Kitazaki¹

2015

AJEP

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H 2 S generation suppression by the addition of NO 3 from reagent (NR) or compost (NC), and O 2 supply (OX) was quantitatively estimated in column percolation experiments. The cumulative amounts of oxygen added exceeded 300 mmol-O/L in NR and NC, and approximately 2 mmol-O/L in OX on day 75. The cumulative amounts of H 2 S generated on day 60 in control, NR, NC, and OX were 69, 26, 71, and 31 mmol-H 2 S/L, respectively. The amounts in NR and OX were half of that in control, whereas the amount in NC was almost the same as that in control. The H 2 S generation rates from day 50 to day 60 in control, NR, NC, and OX were 0.86, 0.019, 0.75, and 0.041 mmol-H 2 S/(L·d), respectively, and the rates in NR, NC, and OX were 0.02, 0.9, and 0.05 times that in control. In this way, the H 2 S generation suppression effects of NO 3 reagent addition were observed. In NR, although NO 3 was injected from the top of the column, the suppression effect reached the deep layer.

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“…SO 4 2-or bound to metals (Fe, Cd, Zn, Cu, Hg). With depletion of O 2 (a major electron acceptor) the anaerobic condition developes rapidly in the landfill, SO 4 2-acts as an alternative electron acceptor and transformed into H 2 S and S 2-occurs via biochemical reactions (Dewil et al, 2008, Lee et al, 2006. A fraction of formed sulphide is bound to metallic ions and precipitated (e.g.…”

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confidence: 99%

“…waste composition, pH. In gas phase, besides H 2 S, other S compounds including methyl mercaptan (CH 3 SH), dimethyl sulfide ((CH 3 ) 2 S), carbon disulfide (CS 2 ) were also detected; but H 2 S is the dominant S components, accounting for 80 -98% (w/w) of all S gases measured , Kim, 2006, Lee et al, 2006, GolderAssociates, 2009)n addition the knowledge about desulphurization of landfill gas has been limited (Rasi et al, 2007). Thus in the current LCA model, without considering other S gases (except H 2 S) and desulphurization, the possible fates of S are modelled including SO 4 2-leachate, fugitive H 2 S, SO 2 generated from landfill gas combustion, and S present in insoluble form.…”

mentioning

confidence: 99%

Life Cycle Assessment (LCA) of Light-Weight Eco-composites

Guo¹

2012

Springer Theses

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LCA of Light-weight Eco-composites Statement of originality 2 Statement of originalityI hereby declare that this submission is my own work and to the best of my knowledge it contains no materials previously published or written by another person.Contributions made to the research of this thesis by others, with whom I have worked with are explicitly acknowledged. I also declare that the intellectual content of this thesis is the product of my own work, except to the extent that assistance from others with data collection and modification of process-oriented model DNDC is acknowledged. Miao GuoSep 2010 LCA of Light-weight Eco-compositesAbstract 3 AbstractThe environmental profiles of novel wheat based foam materials were investigated in this thesis using Life Cycle Assessment (LCA) methods. The LCAs were developed using primary data collected from industrial sources combined with new laboratory experiments supplemented with secondary data from publicly available sources.Laboratory research was conducted to obtain important missing data on WBFs for the LCA modelling, including physico-chemical parameters, biodegradability and energy recovery under anaerobic digestion conditions.Contribution analysis suggested that the emissions evolved from the wheat agroecosystem and PVOH production, together with the energy and infrastructure involved in WBF production were the major contributors to the environmental burdens of the WBF life cycle in most impact categories. The atmospheric emissions resulting from WBF degradation at the end-of-life also emerged as another important contributor to environmental impact. Amongst the diverse ‗end-of-life' scenarios examined, AD and home composting were suggested to be the optimum choices for WBF waste treatment. This research discusses two N 2 O modelling approaches and presents a method to expand the system boundary by integrating the process-oriented model DNDC for field emissions into the LCA. Sensitivity analysis suggests that the environmental profiles of agricultural products are influenced substantially by the system boundary definition. LCA of Light-weight Eco-compositesAbstract 4 Furthermore, it suggests that the ‗general rule' in LCA practice by applying an empirical model or a default emission factor (EF) could deliver unreliable LCA findings.This study also evaluated the sensitivity of the LCA results to methodology and data variations and quantified the uncertainties in the LCA outcomes arising from uncertainty in the inventory and data variability. This has led to an increase in confidence in the LCA findings. At the same time it indicates the areas where improvements in data or methods are needed in order for robust conclusions to be drawn and unbiased information to be delivered e.g. the methodological rigidity of characterization models, the IPCC Tier 1 EF uncertainty range. LCA of Light-weight Eco-compositesAcknowledgements 5

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Reduced sulfur compounds in gas from construction and demolition debris landfills

Cited by 96 publications

References 9 publications

Performance of Air Fresher System for the Removal of Various Odorants Released from Foodstuffs

Performance of Air Fresher System for the Removal of Various Odorants Released from Foodstuffs

Suppressing Hydrogen Sulfide Generation by Nitrate or Oxygen Addition in Column Percolation Experiment

Life Cycle Assessment (LCA) of Light-Weight Eco-composites

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