Aquatic biomasses have fast growth rate amicable for energy applications. Presence of low melting alkali elements is a major challenge; however they are plant nutrients that enhances the ash utilization potential. The aim of this study was to evaluate aquatic biomasses (Eichornia, Hydrilla, Lemna, and Spirogyra) for potential energy application, and to assess the accumulation of plant nutrients in the ashes obtained at different temperatures (500, 600, 700, 800, and 900 °C). Volatile matter content (wt.% dry basis) was lower in Spirogyra (58.2%) or Hydrilla (56.8%) than Eichornia (68.3%) or Lemna (64.7%), whereas fixed C content (wt. % dry basis) was higher for Eichornia and Lemna (about 11%) and lower for Spirogyra (7.4%) and Hydrilla (1.0%). Carbon content ranged from 25.2 to 37.9%; decreased in the order Eichornia > Lemna > Spirogyra > Hydrilla. Ash content was higher for Hydrilla (42.1%) followed by Spirogyra (34.5%), Lemna (24.0%) and Eichornia (19.9%). FTIR and cluster analysis showed comparable ash characteristics for Eichornia and Lemna; Hydrilla and Spirogyra have typical characteristics. Plant nutrient (except N, and K) contents in the ash increased with increase in temperature. Potassium and phosphorous content was higher in Eichornia and Lemna. Slagging and fouling tendencies could be arranged in the order Hydrilla > Eichornia > Lemna > Spirogyra. Eichornia, Lemna, and Spirogyra feedstock could be used for energy application and the resultant ash has valuable plant nutrients (K and P). Low temperature (600–700 °C) processing is advantageous to conserve plant nutrients in ash.

水生生物质具有适合能源应用的快速增长速率。存在低熔点碱金属元素是一个重大挑战。但是它们是植物养分，可以提高灰分的利用潜力。这项研究的目的是评估潜在能量应用中的水生生物量（Eichornia，Hydrilla，Lemna和Spirogyra），并评估在不同温度（500、600、700、800和200℃ ）获得的骨灰中植物养分的积累。 900°C）。挥发物含量（wt。％干基）在较低的水绵（58.2％）或黑藻（56.8％）比凤眼（68.3％）或稀（64.7％），而固定的C含量（重量％折干计算）是用于更高凤眼和浮萍（约11％），并降低水绵（7.4％）和黑藻（1.0％）。碳含量为25.2％至37.9％; 的顺序降低凤眼 > 浮萍 > 水绵 > 黑藻。Hydrilla（42.1％），Spirogyra（34.5％），Lemna（24.0％）和Eichornia（19.9％）的灰分含量更高。FTIR和聚类分析显示了凤眼莲和Lemna具有相当的灰分特征; 水dr和螺旋藻具有典型特征。灰分中的植物养分（氮和钾除外）含量随温度升高而增加。钾和磷含量较高凤眼和浮萍。结渣趋势和结垢趋势可以按Hydrilla  >  Eichornia  >  Lemna  >  Spirogyra的顺序排列。Eichornia，Lemna和Spirogyra原料可用于能源应用，并且产生的灰分具有有价值的植物营养素（K和P）。低温（600–700°C）处理有利于节省灰烬中的植物养分。