Tidal waste causes accumulation of seaweed and marine plants on coasts, resulting in an.

eutrophication process and proliferation of insects, nematodes, and bacteria that negatively affect the beach ecosystem and local human economic activities. This work highlights the potential of beach wrack from the Andalusian Mediterranean coastline as cellulosic materials, in the frame of concepts such as waste management, revalorization, and reduction of hazardous chemicals. With this purpose, beach waste was harvested, washed with water, characterized, and subjected to chemical-free hydrothermal treatments. A central composite design was defined in order to relate the hydrothermal treatment conditions to the composition of the liquid and solid fractions. It was concluded that polynomial models encompassing linear, quadratic, and binary effect parameters reproduce the experimental results satisfactorily (e.g., R² = 0.97–0.98 for saccharides released). As expected, severe conditions resulted in higher removal of hemicellulose, and of small amounts of lignin along with it, but at the expense of the yield. Results allowed us to choose high temperature (150 °C), short time (30 min) and low liquid/solid ratio (8) as a compromise solution, by which the yield and the outlet concentrations of glucose, xylose, and arabinose approached their optimal values. Although longer times grant further removal of non-fibrous materials, this small difference is compensated by energy savings and reduction on water consumption.

潮汐废物导致海藻和海洋植物在海岸堆积，导致

富营养化过程和昆虫、线虫和细菌的增殖对海滩生态系统和当地人类经济活动产生负面影响。这项工作突出了安达卢西亚地中海海岸线的海滩残骸作为纤维素材料的潜力，在废物管理、重新定价和减少危险化学品等概念的框架内。出于这个目的，海滩垃圾被收集、用水清洗、表征，并进行无化学物质的水热处理。为了将水热处理条件与液体和固体部分的组成联系起来，定义了中心复合设计。得出的结论是，包含线性、二次和二元效应参数的多项式模型令人满意地再现了实验结果（例如，R ² = 0.97–0.98 对于释放的糖类）。正如预期的那样，苛刻的条件导致半纤维素和少量木质素的去除率更高，但以牺牲产率为代价。结果允许我们选择高温（150 °C）、短时间（30 分钟）和低液/固比（8）作为折衷方案，通过该方案，葡萄糖、木糖和阿拉伯糖的产量和出口浓度接近他们的最优值。虽然更长的时间可以进一步去除非纤维材料，但这种微小的差异可以通过节能和减少用水量来弥补。