Shabnam Bavandpour, Roya Mafigholami, M. Khezri
Apr 10, 2018
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jundishapur journal of health sciences
Abstract
Triethylene glycol (TEG) is an organic compound of the two-factor or di-alcohol alcohols and is used as a vinyl plasticizer. TEG has high toxicity and is classified in the chemical and polymer production group of petrochemical industry. The current experimental study was conducted on a pilot scale. The total volume of the pilot study was 35.1 liters and its useful volume considering freeboard was30liters. Therangeof variablesinthecurrentstudywasinputCOD(chemicaloxygendemand)(1000-3000mg/L),pH(6,7,and 8), C6H14O4 (600, 800, 1200, and 1800 mg/L), and hydraulic retention time (6, 8, 10, and 10 hours). The results of the study showed that by increasing the compatibility time within 30 days, the COD input to the system also increased, as the input organic loading of thesysteminthe10dayswas769mg/L,andthenthisamountafter20days,thetimespentfor30dayswas941mg/L,duringwhich highconcentrationsof sewagecouldbesignificant. Ontheotherhand,outputorganicloadingalsoincreasedwiththeovertimeand increase of the input organic loading. By increasing the moving bed biofilm reactor (MBBR) hydraulic retention time after 5 hours, residualCODlevelof inputto theamountof 1165.2mg/Lreached40.5mg/L.Theobtainedresultsshowed thattheMBBRsystemhad thehighestefficiencyafter5hoursandoptimizedpH8forconcentrationsof TEGenteringthesystemabout600and800mg/Lwere 96.5% and 92.87%, respectively; and in the hydraulic time of 1 hour reached the efficiency of about 70% at 600 mg/L concentration, and no removal was observed in 800 mg/L, which can be concluded that in 1 hour or less and at concentrations of 800 mg/L and above, it can be used as pretreatment.