Department of Water Science Engineering, School of Environmental Engineering, Ahvaz Chamran University, Ahvaz, Iran.
Environmental and Occupational Hazards Control Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Environ Sci Pollut Res Int. 2017 Oct;24(30):23803-23814. doi: 10.1007/s11356-017-0002-6. Epub 2017 Sep 2.
Handling and treatment of composting leachate is difficult and poses major burdens on composting facilities. The main goal of this study was to evaluate usage of a three-stage, constructed wetland to treat leachate produced in Isfahan composting facility. A pilot-scale, three-stage, subsurface, horizontal flow constructed wetland, planted with vetiver with a flow rate of 24 L/day and a 15-day hydraulic retention time, was used. Removal of organic matter, ammonia, nitrate, total nitrogen, suspended solids, and several heavy metals from Isfahan composting facility leachate was monitored over a 3-month period. Constructed wetland system was capable of efficiently removing BOD (87.3%), COD (74.5%), ammonia (91.5%), nitrate (87.9%), total nitrogen (87.8%), total suspended solids (85.5%), and heavy metals (ranging from 70 to 90%) from the composting leachate. High contaminant removal efficiencies were achieved, but effluent still failed to meet Iranian standards for treated wastewater. This study shows that although a three-stage horizontal flow constructed wetland planted with vetiver cannot be used alone to treat Isfahan composting facility leachate, but it has the potential to be used as a leachate pre-treatment step, along with another complementary method.
处理和处置堆肥渗滤液是困难的，给堆肥设施带来了重大负担。本研究的主要目的是评估三阶段构造湿地在处理伊斯法罕堆肥设施渗滤液中的应用。采用了一个中试规模的三阶段地下水平潜流人工湿地，种植了香根草，流速为 24 L/天，水力停留时间为 15 天。在 3 个月的时间里，监测了三阶段构造湿地系统对来自伊斯法罕堆肥设施渗滤液的有机物、氨氮、硝酸盐、总氮、悬浮固体和几种重金属的去除效果。人工湿地系统能够有效地去除 BOD（87.3%）、COD（74.5%）、氨氮（91.5%）、硝酸盐（87.9%）、总氮（87.8%）、总悬浮固体（85.5%）和重金属（70-90%）。尽管三阶段水平潜流人工湿地种植香根草不能单独用于处理伊斯法罕堆肥设施渗滤液，但它具有作为渗滤液预处理步骤的潜力，与另一种补充方法一起使用。
