KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/kmitl/1

Browse

Settings

Subject: search.filters.subject.alternative energy

Search Results

Now showing 1 - 3 of 3
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Sustainable Waste Management Improves the Quality of Industrial RDF Production and Benefits the Environments
    (2025-09-03)
    Sumethchotimetha, Rapepat
    ;
    Sompornpailin, Kanokporn
    Waste management significantly influences environmental conditions and living standards. This research examined raw material wastes derived from different waste managements: pre-treatment of municipal solid waste (MSW) and landfill solid waste (LSW) recovery, along with their potential effects on the quality of refuse-derived fuel (RDF), to determine an appropriate management system. Waste samples from the Eastern region of Thailand were gathered and categorized according to their source and quality. The two sample groups exhibited similarities in waste classification but differed in quantity of waste components. MSW displayed a slightly elevated average moisture and contaminant level relative to LSW. MSW had a larger fraction of soft plastics (58.78% w/w) compared to recycled landfill waste (36.55% w/w). Hard plastics represented a minor segment in both categories, yet their quantity in recycled landfill waste exceeded that in household waste by over onefold. Notably, LSW generally demonstrated superior quality compared to MSW. Both sources of solid waste were processed for RDF production in industrial operations. The RDF3 produced from the process represented 45-55% of the input raw material. The average heating value (HHV/GCV) of the RDF3 was ascertained to be 4786.90±144.10 kcal/kg. These RDF3 exhibited an average moisture content of 26.20±1.65%. The average chlorine content recorded throughout the experiment was 0.79±0.23%. Raw materials from both origins are essential for maintaining industrial production processes. RDF facility performance, when optimized, can contribute to landfill space minimization and environmental pollution mitigation. Effective management of raw materials and waste segregation provides a viable alternative fuel source for domestic industries.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    In Vitro Evaluation of Winged Bean (Psophocarpus tetragonolobus) Tubers as an Alternative Feed for Ruminants
    (2023-02-01)
    Suntara, Chanon
    ;
    Sombuddee, Napudsawun
    ;
    Lukbun, Saowalak
    ;
    Kanakai, Natdanai
    ;
    Srichompoo, Pachara
    The purpose of the current study is to determine the effects of the replacement of cassava chips with winged bean (Psophocarpus tetragonolobus) tubers (WBTs) on gas production parameters, in vitro degradability, and ruminal fermentation in ruminant diets. The study was performed using a 3 × 4 factorial arrangements and was designed using a completely random method. Factor A employed three various roughage sources that were frequently used by locals to feed ruminants: Oryza sativa L. (a1), Brachiaria ruziziensis (a2), and Pennisetum purpureum (a3). The levels of WBTs substitutions for cassava chips at 0%, 33%, 66%, and 100% in the diet were selected as factor B. The experiment’s findings revealed that replacing the cassava chips in the diet with WBTs at levels of 66 and 100% enhanced the fermentation process by producing a high gas volume at 96 h when Ruzi grass (RZ) was used as the main source of roughage (p < 0.01). The interaction between the roughage source and WBTs showed that organic matter (OM) degradability improved markedly in the case of RZ grass in combination with WBTs at all levels. Both the total volatile fatty acids (TVFAs) at 8 h of incubation and the average value decreased when a complete substitution of casava chips with WBT (WBT 100%) was employed or when employing rice straw as the main source of roughage (p < 0.01). There was no interaction between WBTs and roughage source on the ammonia–nitrogen (NH<inf>3</inf>-N) concentration (ml/dL) and rumen microbial count (p > 0.05). In summary, WBTs can be used effectively when combined with grass (Ruzi and Napier). The implementation of WBTs as a novel alternative feed may effectively replace cassava chips without affecting rumen function.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Methanol dehydration to dimethyl ether over strong-acid-modified diatomite catalysts
    (2016-11-01)
    Pranee, Watcharakorn
    ;
    Neramittagapong, Sutasinee
    ;
    Assawasaengrat, Pornsawan
    ;
    Neramittagapong, Arthit
    Dimethyl ether synthesis via methanol dehydration over strong-acid-modified (with sulfuric, hydrochloric and nitric acid) diatomite (DM) catalysts was conducted in a fixed-bed reactor with elevated temperature reaction from 250 to 350°C. The modified DM catalysts were characterized by using X-ray diffraction, scanning electron microscopy, fourier transform infrared spectroscopy, fourier transform Raman spectroscopy, temperature-programmed desorption of ammonia, temperature-programmed of carbon dioxide, thermal gravimetric analysis, and solid-state 27Aluminum magic angle spinning/nuclear magnetic resonance spectroscopy. It was found that sulfuric-acid-modified DM catalyst yielded the highest DME selectivity (~99%). It was also revealed that methanol conversion depended on Al ions. The methanol conversion increased with Al<sup>(IV)</sup> but decreased with Al<sup>(V)</sup> and Al<sup>(VI)</sup>.