03598nam a2200421 4500 20260817172545.0 080198 th eng .b10136125 AIT Thesis no. 756 Mahmud, Zahid Chemical and biological waste treatment of petroleum refinery and petrochemical wastes Bangkok : Asian Institute of Technology, 1974 121 p. Thesis ; no. 756 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering of the Asian Institute of Technology, Bangkok, Thailand. Thesis (M.Eng.) - Asian Institute of Technology, 1974 The complexities of the disposal of petroleum refinery and petrochemical wastewaters behave for considerable study and evaluation of problems peculiar to each operation. Analyses of the three existing petroleum refineries in Thailand were conducted, Extensive study of one of these refineries was then performed. Daily grab and composited wastewater samples were collected and analyzed for physical, chemical and biological characteristics. Diurnal and daily flow fluctuations were recorded. Existing wastewater generation, collection and treatment systems were studied and wastewater segregation, reuse and effective treatment processes suggested. Chemical coagulation-precipitation was experimented with alum and ferric chloride with and without coagulant-aids, in the presence and absence of intermediate tray in the sedimentation tank for both petroleum refinery and synthetic petrochemical wastes. This resulted in 30-35 percent total COD (chemical oxygen demand) reduction and 90-95 percent insoluble COD reduction. Oil reduction was from 85 -90 percent. Activated sludge units both batch and continuous-fed were operated for both types of wastes. COD reduction of 40-45 percent; phenols reduction of 80-85 percent; sulphides reduction of 75-80 percent and phosphates reduction of 75-80 percent were achieved. Batch activated sludge units were run with pure and mixed culture, without any appreciable difference in the pollutants removal. Aeration lagoon was used to finish the wastewaters from the activated sludge units. Final effluent was having COD from 4045 mg/l; phenols 0.3-0.5 mg/l; sulphides 0.2-0.9 mg/l and phosphates 0.6-1.4 mg/l. This water was found to be non-toxic to fish based on the results of bioassay analyses. Sewage Purification Biological treatment Refuse and refuse disposal Factory and trade waste Nguyen Cong Thanh, Chairperson Pescod, M.B., Examination Committee Htun, Maung Nay, Examination Committee Yang, Yi Ping, Examintion Committee Canadian Government, Scholarship Donor Asian Institute of Technology. Thesis ; no. 756 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B24229 .b10136125 mnait v 260528 2 951012 m a v 0 mnait mnarc 20 40 Barcode : 30050003035242 CREATED : 1995-10-13 RECORD # : i10154863 LPATRON : 1023559 LCHKIN : 2012-07-16 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 5 TOT RENEW : 0 Barcode : 30050160093083 CREATED : 2016-04-22 RECORD # : i12949218 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 16538 16538 0 0 0 0 MAIN MAIN mnait 2026-08-17 0 AIT Thesis no. 756 30050003035242 2026-08-17 17:25:45 2 2026-08-17 20 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no. 756 30050160093083 2026-08-17 17:25:45 2026-08-17 40