Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.
Department of Environmental Engineering, Beijing Institute of Petrochemical Technology, Beijing, 102617, China.
Environ Sci Pollut Res Int. 2020 May;27(14):16656-16667. doi: 10.1007/s11356-020-08229-x. Epub 2020 Mar 4.
Treatment of saline wastewater attracts more and more attention due to its negative effects on the environment in China. Although salt removal from high-saline wastewater is well done in many industry factories, few technologies are available to remove salt from low-saline wastewater (total dissolved solids, TDS < 10,000 mg/L). In this study, ecological floating bed (EFB) enhanced by arbuscular mycorrhizal fungi (AMF) Glomus etunicatum was constructed to remove salt from simulated low-saline wastewater. Results showed that AM formation in Canna indica was not affected by salt stress, and a higher mycorrhizal colonization rate was even observed under salt stress relative to the control treatment. In saline wastewater containing TDS 5000 mg/L, EFB with AM inoculation (AM-EFB) removed 15.9% of TDS, 19.9% of COD, 14.2% of TN, 22.5% of TP, and 11.6-23.0% of salt ions (Na, K, Mg, and Ca) more than EFB without AM inoculation (NM-EFB) in September, and 13.0% of TDS, 15.8% of COD, 17.5% of TN, 16.6% of TP, and 8.60-22.2% of salt ions (Na, K, Mg, and Ca) more than NM-EFB in October respectively. AMF increased plant uptake to Na and the translocation of Na from root to shoot, especially at the initial stage of the experiment. Additionally, EFB function declined when environmental temperature declined independent of AM inoculation, but the presence of AM increased EFB function in the treatment of saline wastewater relative to NM-EFB. This study provides a new strategy for the treatment of low-saline wastewater and the EFB application in a low-temperature environment.
在中国，高盐废水的除盐技术在许多工业工厂中得到了很好的应用，但对于低盐废水（总溶解固体，TDS<10000mg/L）的除盐技术却很少。本研究构建了丛枝菌根真菌（AMF）Glomus etunicatum 强化的生态浮床（EFB），以去除模拟低盐废水中的盐分。结果表明，盐胁迫对美人蕉的 AM 形成没有影响，与对照处理相比，盐胁迫下甚至观察到更高的菌根定殖率。在 TDS 为 5000mg/L 的含盐废水中，接种 AM 的 EFB（AM-EFB）比未接种 AM 的 EFB（NM-EFB）在 9 月分别去除了 15.9%的 TDS、19.9%的 COD、14.2%的 TN、22.5%的 TP 和 11.6-23.0%的盐离子（Na、K、Mg 和 Ca），10 月分别去除了 13.0%的 TDS、15.8%的 COD、17.5%的 TN、16.6%的 TP 和 8.60-22.2%的盐离子（Na、K、Mg 和 Ca）。AMF 增加了植物对 Na 的吸收和 Na 从根部向地上部的转运，特别是在实验的初始阶段。此外，EFB 的功能随着环境温度的降低而下降，而与 AM 接种无关，但 AM 的存在增加了 EFB 在处理低盐废水方面相对于 NM-EFB 的功能。本研究为低盐废水的处理和 EFB 在低温环境中的应用提供了一种新的策略。
