Coventry University, Priory Street, Coventry, CV1 5FB, UK.
Environ Sci Pollut Res Int. 2018 Jul;25(20):19298-19312. doi: 10.1007/s11356-017-0385-4. Epub 2017 Nov 14.
Filter drains are usually laid along the margins of highways. Highway runoffs are polluted with hydrocarbons and high levels of total dissolved solids. Therefore, effective pollution removal mechanism is necessary in order to avoid contamination of surrounding soils and groundwater. Biodegradation is amongst pollution removal mechanisms in filter drains, but it is a relatively slow process which is dependent on wide range of factors including the type of pollutant and availability of nutrients. This paper reports on a study conducted to investigate the impact of slow-release fertilizer and struvite in enhancement of biodegradation of hydrocarbon in filter drains. Filter drain models incorporated with geotextile were challenged with cumulative oil loading of 178 mg/m/week with a view to comparing the efficiency of these two nutrient sources under high oil pollution loading and realistic rainfall conditions of 13 mm/week. Nutrients and street dust were applied at one-off rate of 17 g/m and 1.55 g/rig to provide nutrient enhancement and simulate field conditions respectively. The impact of the nutrients was studied by monitoring bacterial and fungal growth using nutrient agar, Rose Bengal Agar media and CO2 evolution. EC, pH, heavy metals, TPH, elemental analysis and SAR were used to investigate water quality of effluent of filter drains for potential application as irrigation fluid for trees and flowers planted on road verges. The results show that nutrient application encouraged microbial activities and enhanced biodegradation rates with differences in type of nutrient applied. Also, it was observed that incorporation of geotextiles in filter drains improved pollution retention efficiency and there is a potential opportunity for utilization of struvite in SuDS systems as sustainable nutrient source.
过滤排水渠通常铺设在高速公路的边缘。高速公路径流受到碳氢化合物和高浓度总溶解固体的污染。因此，为了避免周围土壤和地下水的污染，需要有效的污染去除机制。生物降解是过滤排水渠中的一种污染去除机制，但它是一个相对缓慢的过程，取决于广泛的因素，包括污染物的类型和营养物质的可用性。本文报道了一项研究，该研究旨在调查缓释肥料和鸟粪石在增强过滤排水渠中碳氢化合物生物降解方面的影响。带有土工织物的过滤排水渠模型承受了每周 178 毫克/米的累积石油负荷，目的是在高石油污染负荷和每周 13 毫米的实际降雨条件下比较这两种营养源的效率。营养物质和街道灰尘以一次性 17 克/米和 1.55 克/ rig 的用量施加，以分别提供营养增强和模拟现场条件。通过使用营养琼脂、孟加拉玫瑰红琼脂培养基和 CO2 释放来监测细菌和真菌生长，研究了营养物质的影响。EC、pH 值、重金属、总石油烃、元素分析和 SAR 用于研究过滤排水渠流出物的水质，以评估其作为种植在道路边缘的树木和花卉灌溉用水的潜在应用。结果表明，营养物质的应用促进了微生物的活动，提高了生物降解速率，而应用的营养物质类型存在差异。此外，还观察到在过滤排水渠中加入土工织物提高了污染截留效率，并且鸟粪石在 SuDS 系统中作为可持续的营养源具有潜在的利用机会。
