Instituto de Química Aplicada del Litoral (IQAL) Química Analítica, Facultad de Ingeniería Química. Universidad Nacional del Litoral. Santiago del Estero, 2829, Santa Fe, Santa Fe, Argentina; Grupo de Estudios de Medio Ambiente (GEM) Universidad Tecnológica Nacional. Facultad Regional Rafaela, Acuña 49, Rafaela, Santa Fe, Argentina.
Grupo de Estudios de Medio Ambiente (GEM) Universidad Tecnológica Nacional. Facultad Regional Rafaela, Acuña 49, Rafaela, Santa Fe, Argentina.
J Environ Manage. 2020 Oct 15;272:111094. doi: 10.1016/j.jenvman.2020.111094. Epub 2020 Jul 23.
There are different physicochemical and biological methods to treat effluents. However, their efficiency is not enough to meet the effluents discharge limits. For this reason, it could be possible to employ a polished treatment. A suitable alternative for this goal could be constructed wetlands (CWs). The aim of the present research was to evaluate contaminants removal efficiency of a pilot scale horizontal subsurface flow constructed wetland (HSSFW) for tertiary treatment of dairy wastewater. A vegetation study was also conducted in order to determine the role of plants on nutrient removal. A pilot scale HSSFW planted with Typha domingensis was built in a dairy factory, after the biological treatment. The substrate used was river gravel. During a seven-month research period, thirty-two samples (influent and effluent) were taken and analyzed to determine physicochemical and microbiological parameters as well as removal efficiencies. Biomass, TP, TKN and organic matter content in plants was determined at the beginning and end of the monitoring period. Suspended solids showed significant differences between inlet and outlet, with a mean removal efficiency of 78.4%. For BOD and COD, mean removal efficiencies were respectively 57.9 and 68.7%. Removal percentages for TKN, Nitrates and TP were lower than other parameters (25.7%, 47.8% and 29.9%, respectively). Fecal Coliform bacteria decreased one order of magnitude in final effluent. In the case of Escherichia coli and Pseudomona aeruginosa results were variable. Total biomass increased 4.6 times at the end of the monitoring period. The study of plants indicated its important contribution in terms of contaminant uptake and retention. HSSFW would be an advisable alternative as a tertiary treatment of dairy wastewater.
有不同的物理化学和生物方法来处理废水。然而，它们的效率不足以满足废水排放限值。出于这个原因，可能需要进行抛光处理。一种合适的替代方法可以是人工湿地（CWs）。本研究的目的是评估中试规模水平潜流人工湿地（HSSFW）对乳制品废水进行三级处理的污染物去除效率。还进行了植被研究，以确定植物在养分去除中的作用。在一家乳制品厂的生物处理之后，建造了一个中试规模的 HSSFW，该湿地种植了香蒲。所用的基质是河卵石。在七个月的研究期间，采集并分析了三十二个样本（进水和出水），以确定理化和微生物参数以及去除效率。在监测期开始和结束时，测定了植物中的生物量、TP、TKN 和有机物含量。悬浮物在入口和出口之间存在显著差异，平均去除效率为 78.4%。对于 BOD 和 COD，平均去除效率分别为 57.9%和 68.7%。TKN、硝酸盐和 TP 的去除率低于其他参数（分别为 25.7%、47.8%和 29.9%）。粪大肠菌群在最终出水中减少了一个数量级。在大肠杆菌和铜绿假单胞菌的情况下，结果是可变的。总生物量在监测期末增加了 4.6 倍。植物的研究表明，它在污染物吸收和保留方面做出了重要贡献。HSSFW 将是乳制品废水三级处理的一种可行替代方法。
