Survey on the Performance of Ilam Wastewater Treatment Plant in the Removal of Coliform, Fecal Coliforms and other Parameters Effected on Water Quality

Using aerated lagoons for the treatment of municipal wastewater in the areas with warm and cold climate is convenient if the enough and cheap land is existed. Because of the strict environmental regulations, water resources shortage and the necessity of effluent reuse, treatment of municipal wastewater by aerated lagoons is easily feasible. This study was investigated to evaluate the performance of aerated lagoons of Ilam city from September 2012 to May 2013. The sampling (eighteen samples) from inlet and outlet of the treatment plant was conducted during nine continuously months. The performance of the waste water treatment plant was carried out using indices such as BOD5, COD, TSS, TN, total coliform and fecal coliform in the influent and effluent. All the experiments were conducted according to the standard method for the examination of water and wastewater reference and the results were analyzed by Excel and SPSS (Pearson's correlation and T-test) softwares. The raw wastewater analysis was showed that it's pollution strength was in the range of intermediate wastewaters. The removal efficiency of the treatment plant for BOD5, COD, TSS, TN, total coliform and fecal coliform were 80.49%, 78.82%, 82.6%, 16.59%, 23.75% and 51.85%, respectively. Discussion & The results indicated that the treatment plant did not have convenient efficiency according to the environmental standards. Therefore, the appropriate measures are required to modify and upgrade of the treatment plant units capacity.