Environmental Engineering and Management, Asian Institute of Technology (AIT), P.O.Box 4, Klong Luang, Pathumthani, 12120, Thailand; Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW, 2007, Australia.
Environmental Engineering and Management, Asian Institute of Technology (AIT), P.O.Box 4, Klong Luang, Pathumthani, 12120, Thailand.
J Environ Manage. 2019 Nov 15;250:109526. doi: 10.1016/j.jenvman.2019.109526. Epub 2019 Sep 12.
Hospital wastewater contains acetaminophen (ACT) and nutrient, which need adequate removal and monitoring to prevent impact to environment and community. This study developed a pilot scale vertical flow constructed wetland (CW) to (1) remove high-dose ACT and pollutants in hospital wastewater and (2) identify the correlation of peroxidase enzyme extruded by Scirpus validus and pollutants removal efficiency. By that correlation, a low-cost method to monitor pollutants removal was drawn. Plants, such as Scirpus validus, generated peroxidase enzymes to alleviate pollutants' stress. Results showed that the CW removed 3.5 to 6 logs of initial concentration 10 mg ACT/L to a recommended level for drinking water. The CW eliminated COD, TKN and TP efficiently, meeting the wastewater discharged standards of Thailand and Vietnam. By various multivariable regression models, concentrations of ACT in CW effluent and enzymes in S. validus exhibited a significant correlation (p < 0.01, R = 68.3%). These findings suggested that (i) vertical flow CW could remove high-dose ACT and nutrient and (ii) peroxidase enzymes generated in S. validus, such as soluble and covalent ones, could track ACT removal efficiency. This would help to reduce facilities and analytical cost of micro-pollutants.
医院废水中含有对乙酰氨基酚（ACT）和营养物质，需要进行充分的去除和监测，以防止对环境和社区造成影响。本研究开发了一个中试规模的垂直流人工湿地（CW），以（1）去除高剂量的 ACT 和医院废水中的污染物，以及（2）确定香蒲中过氧化物酶与污染物去除效率的相关性。通过这种相关性，可以制定一种低成本的污染物去除监测方法。植物，如香蒲，会产生过氧化物酶来减轻污染物的压力。结果表明，CW 可以将初始浓度为 10mg ACT/L 的 3.5 到 6 个对数去除到饮用水的推荐水平。CW 有效地去除了 COD、TKN 和 TP，达到了泰国和越南的废水排放标准。通过各种多元回归模型，CW 出水中的 ACT 浓度和香蒲中的酶之间表现出显著的相关性（p<0.01，R=68.3%）。这些发现表明（i）垂直流 CW 可以去除高剂量的 ACT 和营养物质，以及（ii）香蒲中产生的过氧化物酶，如可溶性和共价过氧化物酶，可以跟踪 ACT 的去除效率。这有助于降低微污染物的设施和分析成本。
