Natural Resources Institute (IRN), Federal University of Itajubá, Itajubá, MG, 37500-903, Brazil.
Natural Resources Institute (IRN) and Electrical Systems and Energy (ISEE), Federal University of Itajubá, Itajubá, MG, Brazil.
Environ Sci Pollut Res Int. 2019 Sep;26(27):27620-27630. doi: 10.1007/s11356-018-2318-2. Epub 2018 Jun 8.
Aside from the ability of plants to remove domestic-industrial wastewater contaminants from various types of water, macrophytes can also serve as an alternative source of energy. The goal of the present study was to test the viability of biogas production using aquatic macrophyte species-Eichhornia crassipes and Pistia stratiotes-contaminated with cadmium (Cd) after the phytoremediation process. The plants were transferred to a nutrient solution contaminated with 0.8 mg Lof Cd. The experiment was set up in a 2 × 3 factorial scheme with the presence or absence of Cd and three phytoremediation times (20, 40, or 60 days) using P. stratiotes followed by an additional treatment consisting of P. stratiotes + E. crassipes for 20 days. The acute and chronic effects of bioassays with the microcrustacean Daphnia similis were used to evaluate the ability of the macrophytes to remove toxicity by phytoremediation. The viability test of biogas production after phytoremediation was evaluated using micro-biodigesters. According to the results, at least 60 days of phytoremediation are necessary to remove/remediate the Cd present in the contaminated solution. The metal did not influence the macrophytes' methanogenic activity, showing that these macrophytes can be used for biogas/methane production. The combination of Pistia stratiotes with Eichhornia crassipes is a good alternative to reduce phytoremediation time, but for 20 days of testing, the presence of Eichhornia crassipes reduces the biogas production/CH. However, it is believed that if the digestion time is extended, this effect can be minimized. The phytoremediation time indicated that Pistia stratiotes must remain at least 60 days to remove/remediate the Cd present in the contaminated solution.
除了植物去除各种类型水中的工业废水污染物的能力外，大型水生植物还可以作为能源的替代来源。本研究的目的是测试受镉（Cd）污染的水生植物凤眼蓝和水蕹菜经过植物修复后生产沼气的可行性。这些植物被转移到含有 0.8mg L Cd 的营养溶液中。实验采用 2 × 3 因子设计，分别在有或无 Cd 的情况下，以及使用水蕹菜进行 20、40 或 60 天的植物修复时间，随后进行了一个额外的处理，即再使用 20 天水蕹菜和凤眼蓝。使用溞属浮游甲壳动物进行急性和慢性生物测定，评估大型水生植物通过植物修复去除毒性的能力。在进行植物修复后，使用微型生物消化器评估沼气生产的可行性测试。结果表明，至少需要 60 天的植物修复才能去除/修复污染溶液中的 Cd。金属没有影响大型水生植物的产甲烷活性，表明这些大型水生植物可用于沼气/甲烷生产。水蕹菜和凤眼蓝的组合是减少植物修复时间的好方法，但在 20 天的测试中，凤眼蓝的存在会降低沼气生产/CH。然而，据信如果延长消化时间，这种影响可以最小化。植物修复时间表明，水蕹菜必须至少 60 天才能去除/修复污染溶液中的 Cd。
