Performance of a surface flow constructed wetland system used to treat secondary effluent and filter backwash water
2010
Vidales-Contreras, J.A. (Universidad Autonoma de Nuevo Leon (Mexico). Facultad de Agronomia) | Gerba, C.P. (University of Arizona, Tucson Arizona (USA). Soil Water and Environmental Science Dept.) | Karpiscak, M.M. (Universidad Autonoma de Nuevo Leon (Mexico). Facultad de Agronomia) | Fuentes, H.R. (Universidad Autonoma de Nuevo Leon (Mexico). Facultad de Agronomia) | Escareno, J.J.H. (Universidad Autonoma de Nuevo Leon (Mexico). Facultad de Medicina Veterinaria y Zootecnia) | Chaidez-Quiroz, C. (Centro de Investigacion en Alimentacion y Desarrollo, Sinaloa (Mexico))
The performance of a surface flow wetland used to treat activated sludge effluent and filter backwash water from a tertiary treatment facility was evaluated. Samples were collected before and after vegetation removal from the wetland system, which consisted of two densely vegetated settling basins (0.35 ha), an artificial stream and a 3-ha surface flow wetland. Bulrush (Scripus spp.) and cattail (Typha domingensis) were the dominant plant species. The average inflow of chlorinated secondary effluent during the first two months of the actual study was 1.84 m3 per min. while the inflow for backwash water treatment ranged from 0.21 to 0.42 m3 per min. The system was able to reduce TSS and BOD5 to tertiary effluent standards; however, monitoring of chloride concentrations revealed that wetland evapotranspiration is probably enriching pollutant concentrations in the wetland outflow. Coliphage removal from the filter backwash was 97 and 35% during 1999 and 2000, respectively. Howe
显示更多 [+] 显示较少 [-]