Grupo de investigación Ciencia e Ingeniería en Sistemas Ambientales (GCISA), Facultad de Ingeniería Civil, Departamento de Ingeniería Ambiental y Sanitaria, Universidad del Cauca, Popayán, Colombia.
J Environ Sci Health B. 2013;48(2):122-32. doi: 10.1080/03601234.2013.726909.
This study investigates the effects of chlorothalonil (CLT) on chemical oxygen demand (COD) and dissolved organic carbon (DOC) in pilot-scale horizontal subsurface flow constructed wetlands (HSSFCW) planted with Phragmites australis. Physicochemical parameters of influent and effluent water samples, microbial population counting methods and statistical analysis were used to evaluate the influence of CLT on organic matter removal efficiency. The experiments were conducted on four planted replicate wetlands (HSSFCW-Pa) and one unplanted control wetland (HSSFCW-NPa). The wetlands exhibited high average organic matter removal efficiencies (HSSFCW-Pa: 80.6% DOC, 98.0% COD; HSSFCW-NPa: 93.2% DOC, 98.4% COD). The addition of CLT did not influence organic removal parameters. In all cases CLT concentrations in the effluent occurred in concentrations lower than the detection limit of the analytical method. Microbial population counts from HSSFCW-Pa showed significant correlations among different microbial groups and with different physicochemical variables. The apparent independence of organic matter removal and CLT inputs, along with the CLT depletion observed in effluent samples demonstrated that HSSFCW are a viable technology for the treatment of agricultural effluents contaminated with organo-chloride pesticides like CLT.
本研究考察了百菌清（CLT）对种植芦苇的中试水平潜流人工湿地（HSSFCW）中化学需氧量（COD）和溶解性有机碳（DOC）的影响。采用进水和出水水样的理化参数、微生物种群计数方法和统计分析来评估 CLT 对有机物去除效率的影响。实验在四个种植芦苇湿地（HSSFCW-Pa）和一个未种植湿地（HSSFCW-NPa）的重复湿地中进行。湿地表现出较高的平均有机物去除效率（HSSFCW-Pa：DOC 为 80.6%，COD 为 98.0%；HSSFCW-NPa：DOC 为 93.2%，COD 为 98.4%）。添加 CLT 并不影响有机物去除参数。在所有情况下，CLT 在出水中的浓度均低于分析方法的检测限。HSSFCW-Pa 的微生物种群计数显示，不同微生物群之间以及与不同理化变量之间存在显著相关性。有机物去除和 CLT 输入的明显独立性，以及在出水样品中观察到的 CLT 耗尽表明，HSSFCW 是一种可行的技术，可用于处理受有机氯农药如 CLT 污染的农业废水。
