Evaluation of performance sewage treatment in Ravanj

The Ravanj sewage treatment plan is in south of Delijan located in Markazi province. Rananj is located in mounted area and stoned layer coursed a dangerous condition because of no water drainage. So، water and sewerage management company decided to solve this problem by evaluation of its treatment. Refining of waste water done by Hans bioshoft package is used. This package is a safe، trouble free and environmentally friendly، has on biological filtering of odors، and can be installed on the ground in different levels. After installation the Hans bioshaft system، BOD and COD for out flow samples were measured. The results shown that the BOD and COD out flow are higher than standard BOD and COD proposed environment standard. We proposed some of recommendation for solving this problem. At the end، the results shown that the BOD and COD out flow were gone to suitable range.