Department of Biological Engineering, College of Engineering, Utah State University, 4105 Old Main Hill, Logan, UT, 84322-4105, USA.
Instituto Especializado de Estudios Superiores Loyola, San Cristóbal, Dominican Republic.
Environ Sci Pollut Res Int. 2020 Apr;27(12):14138-14149. doi: 10.1007/s11356-020-07927-w. Epub 2020 Feb 10.
Anaerobic digestion of water hyacinth (Pontederia crassipes Mart.) from eutrophic water bodies could be a sustainable post weed management practice to generate bioenergy. Comparative analyses of the water quality, physicochemical characteristics, and biomethanation kinetics of water hyacinth from two sites with different water types (brackish versus freshwater) in the Ozama river, Dominican Republic, were conducted. Also, the energy produced from the anaerobic digestion and that consumed in harvesting was estimated. The highest non-structural components in the form of protein (18.8 ± 1.9%) and extractives (26.4 ± 0.1%) were found in brackish water hyacinth, whereas that from freshwater had the highest amount of holocellulose (41.2 ± 2.8%). Indicators of plant productivity, i.e., chlorophyll b and bulk density, were more than 30% higher in brackish than in freshwater hyacinth. The methane production rate in the digestion of water hyacinth from brackish water (22.5 N. L/kg VS · day) was twice that from freshwater (10.0 N. L/kg VS· day). The higher nutrient content in the brackish water could have influenced the superior performance of water hyacinth from that source compared with that from freshwater. Overall, the maximum methane potential of the Ozama river water hyacinth was 399.2 ± 32.2 N. L CH/kg VS. The estimated energy produced per ton of fresh biomass was 846.5 MJ, but only 57.9 MJ would be required for mechanical harvesting. The biomethanation of water hyacinth can mitigate weed management costs in developing countries.
富营养化水体中的凤眼莲（Pontederia crassipes Mart.）的厌氧消化可能是一种可持续的杂草后管理实践，可以产生生物能源。对多米尼加共和国 Ozama 河两个不同水类型（咸水和淡水）地点的凤眼莲的水质、物理化学特性和生物甲烷动力学进行了比较分析。还估算了厌氧消化产生的能量和收获消耗的能量。在咸水凤眼莲中发现了最高的非结构性成分，以蛋白质（18.8±1.9%）和提取物（26.4±0.1%）的形式存在，而在淡水凤眼莲中发现了最高的全纤维素（41.2±2.8%）。指示植物生产力的叶绿素 b 和体密度在咸水凤眼莲中比在淡水凤眼莲中高出 30%以上。来自咸水的凤眼莲消化中的甲烷生成率（22.5 N. L/kg VS·天）是来自淡水的两倍（10.0 N. L/kg VS·天）。咸水中较高的养分含量可能影响了来自该来源的凤眼莲的优异性能，与来自淡水的凤眼莲相比。总体而言，Ozama 河凤眼莲的最大甲烷潜力为 399.2±32.2 N. L CH/kg VS。每吨新鲜生物质的估计能量产量为 846.5 MJ，但机械收获仅需 57.9 MJ。凤眼莲的生物甲烷化可以减轻发展中国家的杂草管理成本。
