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    Item type:Publication,
    Reduction of Sound Pressure Levels with Noise Barriers Containing Agricultural Residues: Case Study
    (2025-01-01)
    Tinnam, Pasit
    ;
    Yodpijit, Nantakrit
    ;
    Junsupasen, Suparoek
    ;
    Sappakittipakorn, Manote
    ;
    Jongprasithporn, Manutchanok
    Over the past decade, PM 2.5 pollution has become an increasingly serious environmental concern in Thailand, with one of its primary sources being the open burning of agricultural residues, particularly sugarcane residues. To mitigate this issue, it is essential to develop alternative applications for sugarcane leaves that eliminate the need for burning. This study investigates a sustainable approach by incorporating sugarcane leaves into producing noise insulation mortar boards. The research aims to assess these boards' acoustic performance through a combination of laboratory experiments and field testing. Employing the Design of Experiments (DOE) methodology, mortar samples were prepared with sugarcane leaf content at 2%, 4%, 6%, 8%, and 10% by cement weight to identify the optimal mixture. Analysis of variance (ANOVA) indicated that the sugarcane leaf content had a statistically significant effect on sound pressure level reduction at a 95% confidence level. Both laboratory and field results demonstrated that the 4% sugarcane leaf mixture yielded the highest performance, achieving noise reductions of 20.6 dBA and 23 dBA, respectively. These findings confirm that mortar boards reinforced with sugarcane leaves effectively reduce noise and offer a viable solution for repurposing agricultural residues. This approach contributes to noise pollution mitigation and addresses environmental concerns related to the open burning of biomass.
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    Pretreated and enzyme-hydrolyzed peanut shell for cultivation of clostridium sp. g10
    (2021-01-01)
    Sanguanchaipaiwong, V.
    ;
    Yoddamnern, P.
    ;
    Matngammnuang, W.
    ;
    Leksawasdi, N.
    Peanut shell (PS) is an agricultural residue and generated in large quantities at the peanut processing location. Normally, these lignocellulosic materials are utilized as feed or disposed of to landfill or burnt. In this research, PS was pretreated, enzymatically hydrolyzed, and utilized as a carbon source for Clostridium sp. G10 to produce butanol through acetone-butanol-ethanol (ABE) fermentation. PS was pretreated with H<inf>2</inf>SO<inf>4</inf> and NaOH (0- 1.0M). The highest reducing sugar concentration in the supernatant obtained from 0.4M H2SO4 was 23.1 g/L. Subsequently, the solid portion of pretreated PS was hydrolyzed at 50 °C for 24 h using commercial cellulose (ACCELLERASE™ 1500) with various treatment times duration and enzyme activity to solid ratios. The result suggested that enzyme activityof pretreated PS weight ratio of 1250 carboxymethyl cellulose (CMC) U:1 g yielded the maximum concentration of reducing sugars(12.74 g/L). Mixture of acidic pretreatment hydrolysate and enzyme hydrolysate contained41.2 g/L glucose concentration. Clostridium sp. G10 was then cultured in three conditions; T6 medium with 45 g/L glucose as a control, T6 medium prepared with 45 g/L reducing sugar equivalent of PS hydrolysate, and PS hydrolysate with 45 g/L reducing sugar equivalent at 37°C for 168 h. The implementation ofPS hydrolysate solely as a carbon source produced the butanol concentration of 10.8 g/L. This was not significantly different (p < 0.05) from using T6 medium with glucose (9.3 g/L). The highest butanol production of 15.2 g/Lwas yielded from T6 medium with PS hydrolysate. It could be concluded that hydrolyzed PS could be utilized as a carbon source for production of butanol and ethanol.