Forthcoming and Online First Articles

International Journal of Environmental Engineering

International Journal of Environmental Engineering (IJEE)

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International Journal of Environmental Engineering (2 papers in press)

Regular Issues

  • Enhanced biomethane generation from sweet sorghum bagasse: improvement of bagasse saccharification using response surface methodology   Order a copy of this article
    by Lakshmi Machineni, Gangagni Rao 
    Abstract: Anaerobic digestion (AD) of either untreated or pre-treated sweet sorghum bagasse (SSB) is not yet fully demonstrated and hence rarely published. In the present work, an untapped carbon-rich SSB is subjected to chemical pre-treatment followed by AD for biomethane production. Grinded powder of dried SSB has 35.85% cellulose, 24.96% hemicelluloses, and 22.35% lignin. Impact of catalyst concentration, residence time and pre-treatment temperature on SSB delignification through alkaline and acid pre-treatment are investigated and assessed by variations in the proximal parameters of bagasse. Response surface methodology (RSM) based central composite design (CCD) tool with statistical analysis of variance is applied to optimize SSB delignification and fermentable sugar recovery for higher biomethane production. The maximum methane production from PSSB is ~75% higher and 55% pure in comparison with untreated SSB. These results will provide significant insights on biomethane production from LCB, namely SSB for future industrial scale-ups.
    Keywords: lignocellulosic biomass; LCB; sweet sorghum bagasse; SSB; pre-treatment; response surface methodology; RSM; biomethane; biorefinery; quality; central composite design; CCD.
    DOI: 10.1504/IJEE.2024.10061843
     
  • Assessment of daily and seasonal concentrations of particulates matters generated by rice mills in Makurdi using cluster analysis   Order a copy of this article
    by Seini Aboh Samuel, Enokela Onum Shadrach 
    Abstract: The study was carried out at four rice milling in Makurdi Markets namely Wadata, Wurukum Roundabout, High-Level, and North-Bank. Nokia C3 stopwatch, Hanhart stopwatch and Crowcon Gasman for sensing carbon monoxide, nitrogen dioxide, and sulphur dioxide were adopted for data collection at 5 minutes’ interval between 8 am to 10 am and 4 pm to 6 pm for two months in rainy and dry season. The Wurukum Roundabout recorded the highest concentration of CO and NO2 for both seasons plus highest daily SO2 in dry season. The correlation demonstrates that CO was positively significant (0.029) for both seasons while NO2 and SO2 were weakly significant (0.001) at rainy season. Performing cluster evaluation by square Euclidean distance average link between locations for probable similarities that exist among the particulate and locations indicated two clusters in three stages of combination. The coefficients for these stages were 1.89, 71.85 and 245.7.
    Keywords: rice processing; particulate matter; rice mill; air pollutants; Makurdi.
    DOI: 10.1504/IJEE.2023.10061971