Environmental Science Discipline, Life Science School, Khulna University, Khulna, 9208, Bangladesh.
J Environ Manage. 2020 Oct 15;272:111088. doi: 10.1016/j.jenvman.2020.111088. Epub 2020 Jul 18.
This study investigated the impact of greywater application for home yard gardening. Greywater was collected and treated using screening, sedimentation and solar disinfection methods. Finally, a field experiment was conducted to investigate the impact of untreated and treated greywater on a selected vegetable, Capsicum frutescens and flowering plant, Calendula officinalis for 2 months. The findings depicted that untreated greywater contains higher macro-nutrients with excessive bacterial population compared with tap water (control), however, the treatment process reduced the concentration of most of the unwanted parameters from greywater samples to bring them into irrigation standards. Overall, treated greywater irrigation showed the species-specific impact on experimental plants with more stimulation in Capsicum frutescens species compared with tap water irrigation. Both treated and untreated greywater irrigation increased the growth parameters of Calendula officinalis in comparison with control. The impact was not significant for most of the parameters of Calendula officinalis while compared between greywater (treated and untreated) and control, and between treated and untreated greywater irrigation. Treated greywater irrigation significantly stimulated most of the parameters of Capsicum frutescens while untreated greywater increased only moisture content, and number of branches compared with control. Most interestingly, treated greywater irrigation had significant impact on Capsicum frutescens particularly for number of branches and leaves compared with untreated greywater irrigation. In fine, the greywater, after treatment was bacterially safe and had positive impact on plant growth. The findings of this study will help to conserve irrigation water and to protect and manage aquatic ecosystem from the adverse impact of wastewater.
本研究调查了灰水在家院园艺中的应用影响。灰水通过筛选、沉淀和太阳能消毒方法收集和处理。最后，进行了田间试验，研究了未经处理和处理的灰水对选定蔬菜辣椒和开花植物金盏花的影响，为期 2 个月。研究结果表明，未经处理的灰水中含有较高的宏量营养物质和过多的细菌种群，与自来水（对照）相比，但处理过程降低了大部分灰水样本中不需要的参数浓度，使其达到灌溉标准。总的来说，处理后的灰水灌溉对实验植物表现出特定的影响，与自来水灌溉相比，辣椒物种的刺激作用更大。与对照相比，处理和未经处理的灰水灌溉均增加了金盏花的生长参数。与对照相比，未经处理和处理的灰水之间以及处理和未经处理的灰水灌溉之间，大多数金盏花的参数变化不显著。最有趣的是，与未经处理的灰水灌溉相比，处理后的灰水灌溉显著刺激了辣椒的大多数参数，而未经处理的灰水仅增加了水分含量和分枝数。最有趣的是，处理后的灰水灌溉对辣椒的分枝和叶片数量有显著影响，而未经处理的灰水灌溉则没有。总之，处理后的灰水在细菌安全性方面是安全的，并对植物生长有积极影响。这项研究的结果将有助于节约灌溉用水，并保护和管理水生生态系统免受废水的不利影响。
