Irrigation with treated wastewaters and the protection of Hennaya groundwater a?? Tlemcen, Algeria

摘要

The Henaya Irrigated Perimeter (HIP) is an agricultural area irrigated by treated wastewater (TWW) of Ain El Hout treatment plant. Various analyses have shown that i) this water has low concentration of heavy metals and toxic elements, ii) the average values of the physicochemical parameters for 136 samples are satisfactory (29.2 mg O2a??dma??3 for chemical oxygen demands a?? COD, 13.14 mg O2a??dma??3 for biological oxygen demands a?? BOD, 14.2 mga??dma??3 of suspended matter a?? SM, 1.82 mga??dma??3 of N-NO3, 7.7 for pH and 927.74 ??Sa??cma??1 for electric conductivity a?? EC). Thirdly, it contains a high number of bacteria and nematodes (7200 CFUa??(100 dm3)a??1 for faecal coliforms and 30 eggsa??dma??3 for intestinal Nematodes) which makes it dangerous for groundwater contamination.