Surfactant induced sonic fission: an effective strategy for biohydrogen recovery from sea grass Syringodiumisoetifolium

Abstract

Sea grass (Syringodiumisoetifolium) is a promising source of bioenergy such as hydrogen. Due to the complex cell structure, it requires a pretreatment process prior to fermentation. This study aims to increase the biohydrogen production from sea grass by enhancing the solubilization via surfactant induced sonic fission (SSF). Initially, sonic fission (SF) pretreatment alone was carried out intherange of power from 0.02 kW to 0.18 kW for 0 minutes to 60 minutes. At the optimum condition of SF (0.14 kW, 30 minutes), ammonium dodecyl sulfate, a surfactant was added to improve the pretreatment by reducing its disintegration time period. The condition of SSF 0.14 kW (sonic power), 0.0025 g/g TS (surfactant dosage) and 11 minutes (time) was considered as optimum for effective solubilization of sea grass. The study results illustrated that highersolubilizationof 20.7% was attained through SSF when compared with SF (13.5%). Higher biohydrogen (H 2 ) production of 114(mL H 2 /g COD) was obtained in SSF when compared to SF.

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“…The carbohydrate, protein, and lipid consumption rates were exacerbated in the T80/RGO-amended reactor up to 8.8 ± 3.7, 1.9 ± 0.6, and 0.72 ± 0.3 g/g VSS , respectively, corresponding to the degradation efficiencies of 82.7 ± 5.3, 78.3 ± 7.7, and 80.1 ± 8.7% (Figure a–c). Similarly, Rajesh Banu et al found that sonic fission and surfactant addition had a synergistic impact on the breakdown of organic fractions in seagrass . The carbohydrate and protein degradation efficiencies increased to 87.9 and 81.8% via surfactant-induced sonic fission, compared to 74.5 and 69.1% using sonic fission alone, respectively.…”

“…Higher VFA production results in a lower pH value, which inhibits methanogenic activity and improves hydrogen productivity . Similarly, VFA production was increased to 1.3 g/L by the dual effect of sonic fission and surfactant addition compared to using sonic fission alone (0.86 g/L) …”

“…According to Qing et al, surfactant supplementation increased digestibility by enhancing substrate solubility, modifying the biomass surface, and minimizing nonproductive enzyme adsorption . Rajesh Banu et al demonstrated that a surfactant, ammonium dodecyl sulfate, dose of 0.0025 g/g improved the sonic fission pretreatment of seagrass by increasing solubilization, volatile fatty acid yield, and biogas production, resulting in increased biohydrogen output up to 114 mL H 2 /gCOD . Triton X-100, a nonionic surfactant, at the optimum dose of 0.75% w/v, resulted in a maximum biohydrogen yield of 103.97 mmol/L from waste lignocellulosic biomass compared to other surfactants such as PEG1000 and Surfactin .…”