Biogas production potential of aquatic weeds as the next-generation feedstock for bioenergy production: a review

Abstract

Aquatic weeds have exceptionally high reproduction rates, are rich in cellulose and hemicellulose, and contain a negligible amount of lignin, making them an ideal crop for the next generation of biofuels. Previously reported studies proposed that water hyacinth, water lettuce, common duckweeds, and water spinach can be managed or utilized using different advanced techniques, while anaerobic digestion is one of the feasible and cost-effective techniques to manage these biowastes. The present study was carried out to investigate the potential of utilizing four common aquatic weed species (water hyacinth, water lettuce, common duckweeds, and water spinach) as substrates for anaerobic digestion in order to produce biogas. The high reproduction rates, high cellulose and hemicellulose content, coupled with low lignin content, of these aquatic weeds make them ideal candidates for this purpose. The study evaluated the feasibility of anaerobic digestion as a management method for these aquatic weeds, which are often considered invasive and di cult to control. The study provides an overview of the characteristics and management strategies of these aquatic weeds in relation to biogas production, with possible future developments in the eld. * MLCH4/kgVSadded ** l/g VS *** L kg-1 VS ****(ml) /gVs(added)/g plant

Growth Dynamics and Nutrient Removal from Biogas Slurry Using Water Hyacinth

“…The research covered exploration within the WoS utilising specific keywords, including "Water hyacinth" and "Phytoremediation", retrieving 326 articles. Using the VOS viewer software (version 1.6.20), the articles screened based on keyword co-occurrence values up to seven, resulting in the selection of 85 keywords which were further screened for an optimised and relevant visualisation resembling this study objective [1,39,[42][43][44][45]. A network map was generated using frequently used keywords, and the findings are illustrated in Figure 1.…”

“…Indeed, proper and conscientious management practices are essential for minimizing the risk of nutrient runoff and contamination of water bodies and the potential for eutrophication. There are various management processes for biogas slurry [38] but the present study involves the cultivation of WH in biogas slurry, exploiting its dual potential as an effective phytoremediator [1] and a viable substrate for biogas production [39]. This approach represents a novel method that capitalizes on the unique characteristics of WH, thereby offering a sustainable solution for both wastewater treatment and renewable energy generation.…”