Ibrahiem Hadeer, Ismail Ghada Saber M, Migahid Masarrat M, Ghazy Mohamed A, Nasr Mahmoud
Biotechnology Program, Basic and Applied Science Institute, Egypt-Japan University of Science and Technology (E-JUST), Alexandria, Egypt.
Biological and Geological Sciences Department, Faculty of Education, Alexandria University, Alexandria, Egypt.
Int J Phytoremediation. 2024;26(4):546-556. doi: 10.1080/15226514.2023.2253915. Epub 2023 Sep 4.
This study focuses on applying phytoremediation as a low-effective and simple process to treat wastewater laden with 1,4 dioxane (DIOX). A floating macrophyte () was cultivated under hydroponic conditions (relative humidity 50-67%, photoperiod cycle 18:6 h light/dark, and 28-33 °C) and subjected to different DIOX loads between 0.0 (control) and 11.5 mg/g fresh mass (FM). The aquatic plant achieved DIOX and chemical oxygen demand (COD) removal efficiencies of 76-96% and 67-94%, respectively, within 15 days. could tolerate elevated DIOX-associated stresses until a dose of 8.2 mg DIOX/g, which highly influenced the oxidative defense system. Malondialdehyde (MDA) content, hydrogen peroxide (HO), and total phenolic compounds (TPC) increased by 7.3, 8.4, and 4.5-times, respectively, in response to operating the phytoremediation unit at a DIOX load of 11.5 mg/g. The associated succulent value, proteins, chlorophyll-a, chlorophyll-b, and pigments dropped by 39.6%, 45.8%, 51.5%, 80.8%, and 55.5%, respectively. The suggested removal mechanism of DIOX by could be uptake followed by phytovolatilization, whereas direct photodegradation from sunlight contributed to about 19.36% of the total DIOX removal efficiencies. Recycling the exhausted for biochar production was a cost-efficient strategy, making the payback period of the phytoremediation project equals to 6.96 yr.
本研究聚焦于应用植物修复这一低效且简单的过程来处理含有1,4 - 二恶烷（DIOX）的废水。一种漂浮大型植物在水培条件下（相对湿度50 - 67%，光周期18:6小时光照/黑暗，温度28 - 33°C）进行培育，并使其承受0.0（对照）至11.5毫克/克鲜重（FM）之间的不同DIOX负荷。这种水生植物在15天内分别实现了76 - 96%的DIOX去除效率和67 - 94%的化学需氧量（COD）去除效率。该植物能够耐受升高的与DIOX相关的胁迫，直至达到8.2毫克DIOX/克的剂量，这对氧化防御系统产生了高度影响。在DIOX负荷为11.5毫克/克的条件下运行植物修复装置时，丙二醛（MDA）含量、过氧化氢（HO）和总酚类化合物（TPC）分别增加了7.3倍、8.4倍和4.5倍。相关的肉质值、蛋白质、叶绿素a、叶绿素b和色素分别下降了39.6%、45.8%、51.5%、80.8%和55.5%。该植物对DIOX的去除机制可能是吸收后进行植物挥发，而阳光的直接光降解约占总DIOX去除效率的19.36%。将耗尽的植物回收用于生产生物炭是一种具有成本效益的策略，使得植物修复项目的投资回收期等于6.96年。
