Germination and growth of horticultural crops irrigated with reclaimed water after biological treatment and ozonation
Germination and growth of horticultural crops irrigated with reclaimed water after biological treatment and ozonation
复制标题
DOI：
10.1016/j.jclepro.2021.130173
复制
发表时间：
2022-01-10
影响因子：
11.1
通讯作者：
Saroj, Devendra Prakash
中科院分区：
文献类型：
--
作者：
Amori, Precious Nneka;Mierzwa, Jose Carlos;Saroj, Devendra Prakash
将高水量和富含营养的工业废水纳入现有的农业用水管理计划，可能是保护淡水资源、缓解缺水问题和支持农业部门的一个可行选择。采用水培法研究了处理后的工业和生活混合废水对生菜和银甜菜生理性状的影响。采用可持续的生物-臭氧混合工艺处理废水。该工艺对COD去除率96%，柴油去除率92%，亚甲基蓝去除率97%，具有较高的处理能力。利用ICP-MS仪器对回收的河流进行了金属分析，除Cu、Mn和Mo外，所有测试元素的浓度都在作物灌溉的允许范围内。利用污水（有/没有外部营养物）种植作物，并与推荐的营养物培养和自来水控制进行比较。与对照相比，接受外部营养的植株的空气生物量和营养生长相当，光合色素含量较高，但根系发育受到一定损害，这可能是由于H+活性较高，促进了植物根系的金属毒性。在ph控制灌溉下，观察到根系生长的改善。仅用处理过的废水灌溉植株的生物量比自来水处理植株的产量高出50%以上，植株表现出高度的根系觅食。研究的金属，特别是Al， Mn， Cu和Zn的根浓度高于相应的地上部浓度。Pearson相关分析显示，K与植物组织中其他元素（Mg、Ca、Cu、Mn、Zn、Fe）之间存在显著的正交互作用（p < 0.01），表明K在促进植物体内营养物质和光同化物的运输中起着重要作用。结果表明，处理后的废水对作物生长具有较高的适宜性。因此，将处理过的工业和生活混合废水用于灌溉可以被认为是应对全球日益增长的用水压力和农业用水短缺的可持续方式。作物灌溉的再利用潜力取决于再生水的质量和所使用的处理技术。由于现有的研究数据有限，强烈建议进一步研究阐明灌溉的长期影响。
Integration of high water-volume and nutrient-rich industrial wastewater into the existing water management plan for agriculture could be a viable option to protect freshwater resources, mitigate water scarcity problems and support the agriculture sector. Hydroponics were set-up to study the effects of treated mixed industrial and domestic wastewater on physiological traits of lettuce and silverbeet. A sustainable hybrid biological-ozonation process was employed for the wastewater treatment. The studied process showed high treatment capacity by removing 96% COD, 92% diesel and 97% methylene blue compounds. Reclaimed streams were analysed for metals using ICP-MS instrument and the concentrations of all elements tested, exception of Cu, Mn, and Mo, fall within the permissible range for crop irrigation. The crops were grown using the effluents (with/without external nutrient) and compared to a recommended nutrient culture and tap water controls. Compared to the control, plants that received external nutrient had a comparable aerial biomass and vegetative growth, higher photosynthetic pigments but exhibited some root development impairments, probably due to high activity of H+, which promoted metal toxicities on plant roots. Under pH-controlled irrigation, an improvement in root growth was observed. The biomass of plants watered with only the treated wastewater were more than 50% higher than the yield in tap water control and plants exhibited high degree of root foraging. The root concentrations of the studied metals, particularly Al, Mn, Cu and Zn were higher than the corresponding shoot concentrations. Pearson correlation analysis showed a significant positive interaction (p < 0.01) between K and other elements (Mg, Ca, Cu, Mn, Zn, Fe) in plant tissues, thus indicating its role in facilitating transportation of nutrients and photo assimilates in plant. The results suggest a high suitability of the treated wastewater for growth of crops. Thus, the reuse of treated mixed industrial and domestic wastewater for irrigation can be considered a sustainable way to cope with the growing water stress across the globe and the water shortage in agriculture. The reuse potential for irrigation of crops depends on the quality of the reclaimed water and the treatment technologies used. With the limited research data available, further studies to elucidate the long-term implications of the irrigation is highly recommended.