Performance of a land treatment system and vetiver plant for advanced treatment of ahvazwest Municipal wastewater treatment plant effluent

During the last decades efforts related to waste water treatment، has improved significantly in Different places of our country with various climate conditions. To reach this aim using systems are considered that have appropriate applications technically and economically. One of the low cost and native options is using Land-plant system for advanced waste water treatment. The aim of this study was determination of efficiency of local soil of Ahvaz and vetiver plant tothe final reduce the organic load from Municipal wastewater treatment. In order to، a pilot including three Lysimeter swere installed in Ahvaz West wastewater treatment plant. ThreeLysimeter were utilized that local soil was used in one of them، local soil with vetiver plant were used in the other one and soil artificial arrangement (local soil، silica sand (0. 5-1mm)، sand (15-30mm) was used in third Lysimeter. The effluent was transferred from Secondary settling outlet by pump for system that slow current in three filtration rate of 0. 2، 0. 6، 1 ml/min and three replication in each rate was used. The average removal efficiency of BOD5 and COD output from three Lysimeter local soil with vetiver plant، local soil without vetiver plant and soil artificial arrangement for filtration rate of 0. 2 ml/min were; 73. 27%، 68. 39%،58. 91%، 50. 34%، 37. 62% and 35. 9%. For filtration rate of 0. 6 ml/min were; 49. 47%،41. 97%، 43. 16، 28. 31%، 33/68% and 25/55%. For filtration rate of 0. 6ml/min; 26. 44%،31. 44%، 19. 95،17. 81%، 12. 06% and 14. 79%، respectively. The results from this study showed that the best removing percent was assigned to local soil with vetiver plant lysimeter in 0. 2 ml/min current. Based on the results of this study، it can be concluded that a land- plant system as advanced treatment had the ability to meet effluent discharge permit limits and was an economical replacement for stabilization ponds and mechanical treatment options.