Analytical and Environmental Science Division & Centralized Instrument Facility, CSIR-Central Salt & Marine Chemicals Research Institute, G.B. Marg, Bhavnagar, 364002, India.
Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India.
Environ Monit Assess. 2022 Sep 5;194(10):727. doi: 10.1007/s10661-022-10415-y.
The monitoring and assessment of multiple constructed vertical flow wetlands (CVFWs) treating textile dye wastewater (metanil yellow as dye) are studied covering three seasons. Three CVFWs (CVFW-1, dye-5 mg/l; CVFW-2, dye-50 mg/l; and CVFW-3, dye-100 mg/l) and a control (dye-5 mg/l) were used. The CVFWs with Dracaena (an ornamental plant) efficiently removed contaminants like dye, COD, NH-N, and PO-P from the wastewater under varying inlet dye concentrations, indicating its dependence on meteorological conditions. Substantial dye removal was observed to be maximum in summer (control, 44.3%; CVFW-1, 75.1%; CVFW-2, 76.1%; CVFW-3, 46%), but lesser in winter (control, 45%; CVFW-1, 73.1%; CVFW-2, 76.8%; CVFW-3, 42.6%) and minimum in monsoon (control, 40.8%; CVFW-1, 63.5%; CVFW-2, 51.6%; CVFW-3, 37.1%), respectively. Efficiency was less in CVFW-3 as it observed plant stress due to higher inlet dye concentration. COD removal was higher in winter, followed by summer and monsoon. A first-order kinetic model was used to investigate the efficiency of the CVFW system w.r.t. contaminant removal. Various functional groups were characterized using Fourier transform infrared spectroscopy (FTIR) from the inlet and outlet water samples of different CVFWs. The Dracaena accumulated various elements and oxides during the treatment with no stress on its health. No effects on plant health highlight the suitability of Dracaena for textile wastewater treatment. The results were validated using statistical tools like the Mann-Whitney U test and principal component analysis (PCA).
本研究对三个季节中处理纺织染料废水（间甲酚黄为染料）的多个构造垂直流湿地（CVFW）进行了监测和评估。使用了三个 CVFW（CVFW-1，染料 5mg/L；CVFW-2，染料 50mg/L；CVFW-3，染料 100mg/L）和一个对照（染料 5mg/L）。具有龙血树（一种观赏植物）的 CVFW 在不同的入口染料浓度下，有效地从废水中去除污染物，如染料、COD、NH-N 和 PO-P，表明其对气象条件的依赖性。在夏季（对照，44.3%；CVFW-1，75.1%；CVFW-2，76.1%；CVFW-3，46%）观察到最大的染料去除量，但在冬季（对照，45%；CVFW-1，73.1%；CVFW-2，76.8%；CVFW-3，42.6%）和雨季（对照，40.8%；CVFW-1，63.5%；CVFW-2，51.6%；CVFW-3，37.1%）则较低。由于较高的入口染料浓度，CVFW-3 观察到植物应激，因此效率较低。在冬季，COD 去除率较高，其次是夏季和雨季。使用一阶动力学模型研究了 CVFW 系统对污染物去除的效率。从不同 CVFW 的入口和出口水样中使用傅里叶变换红外光谱（FTIR）对各种功能基团进行了表征。在处理过程中，龙血树积累了各种元素和氧化物，而不会对其健康造成压力。对植物健康没有影响突出了龙血树用于处理纺织废水的适宜性。使用统计工具，如曼-惠特尼 U 检验和主成分分析（PCA）对结果进行了验证。
