Aregu Mekonnen Birhanie, Soboksa Negasa Eshete, Kanno Girum Gebremeskel
School of Public Health, College of Health Science and Medicine, Dilla University, Dilla, Ethiopia.
Department of Environmental Health, College of Health Science and Medicine, Dilla University, Dilla, Ethiopia.
Environ Health Insights. 2021 Nov 23;15:11786302211060162. doi: 10.1177/11786302211060162. eCollection 2021.
It is generally accepted that industrial wastewater like tannery effluent is high strength wastewater. The aim of this study was to examine the capacity of for the treatment of high strength wastewater in a constructed wetland. Two constructed wetland beds were designed and one of them was not planted used as a control group. The grass was planted with 20 cm by 20 cm distance from each seedling. The biometric characteristics of was evaluated by taking randomly selected clusters of the grass. The concentration of chromium in the extract of parts of the grass was determined by atomic absorption spectrophotometer. The Chromium bioaccumulation and Translocation factor was estimated. Composite samples before and after treatment of 4 different hydraulic retention time was collected. The physiochemical analysis of the wastewater has been carried out. The constructed wetland bed with performed that, BOD, COD, NH-N, NO-N, TN, PO-P, and TP were reduced at the retention time of 9 days by 91.9%, 96.3%, 62%, 86%, 88.7%, 96.3%, and 92.2% respectively. Chromium was also reduced by 97% at retention time of both 7 and 9 days over the planted bed. The bed with plant performs significantly better than without plant at -value <.01. Therefore, has a capacity to reclaim high strength industrial wastewater in tropical areas.
一般认为，像制革废水这样的工业废水属于高强度废水。本研究的目的是考察[某种植物]在人工湿地中处理高强度废水的能力。设计了两个人工湿地床，其中一个未种植植物作为对照组。草的种植间距为每株幼苗20厘米×20厘米。通过随机选取草的簇来评估[某种植物]的生物特征。用原子吸收分光光度计测定草的部分提取物中铬的浓度。估算了铬的生物累积和转运因子。收集了4种不同水力停留时间处理前后的混合样品。对废水进行了理化分析。种植了[某种植物]的人工湿地床在9天的停留时间内，BOD、COD、NH-N、NO-N、TN、PO-P和TP分别降低了91.9%、96.3%、62%、86%、88.7%、96.3%和92.2%。在7天和9天的停留时间内，种植床对铬的去除率也达到了97%。种植植物的床在p值<0.01时表现明显优于未种植植物的床。因此，[某种植物]有能力在热带地区回收高强度工业废水。
