title: The implementation of data reconciliation for evaluating a full-scale petrochemical wastewater treatment plant.
abstract: Data reconciliation and mass balance analysis were conducted for the first time to improve the data obtained from a petrochemical wastewater treatment plant (WWTP), and the results were applied to evaluate the performance of the plant. Daily average values for 209 days from the inlet and outlet of the plant obtained from WWTP documentation center along with the results of four sampling runs in this work were used for data reconciliation and performance evaluation of the plant. Results showed that standard deviation and relative errors in the balanced data of each measurement decreased, especially for the process wastewater from 24.5 to 8.6 % for flow and 24.5 to 1.5 % for chemical oxygen demand (COD). The errors of measured data were -137 m3/day (-4.41 %) and 281 kg/day (7.92 %) for flow and COD, respectively. According to the balanced data, the removal rates of COD and 5-day biological oxygen demand (BOD5) through the aeration unit were equal to 37 and 46 %, respectively. In addition, the COD and BOD5concentrations were reduced by about 61.9 % (2137 kg/day) and 78.1 % (1976 kg/day), respectively, prior to the biological process. At the same time, the removal rates of benzene, toluene, and styrene were 56, 38, and 69 %, respectively. The results revealed that about 40 % of influent benzene (75.5 kg/day) is emitted to the ambient air at the overhead of the equalization basin. It can be concluded that the volatilization of organic compounds is the basic mechanism for the removal of volatile organic compounds (VOCs) and it corresponds to the main part of total COD removal from the WWTP.
authors: Department of Environmental Health Engineering, School of Health, Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran.
authors: Ali
authors: A
authors: Behnami
authors: Department of Environmental Health Engineering, School of Health, Tabriz University of Medical Sciences, Tabriz, Postal Code: 5166614711, Iran. shakerkhatibi@yahoo.com.
authors: Mohammad
authors: M
authors: Shakerkhatibi
authors: Department of Environmental Health Engineering, School of Health, Tabriz University of Medical Sciences, Tabriz, Postal Code: 5166614711, Iran.
authors: Reza
authors: R
authors: Dehghanzadeh
authors: Faculty of Chemical Engineering, Sahand University of Technology, Tabriz, Iran.
authors: Khaled Zoroufchi
authors: KZ
authors: Benis
authors: Office of Health Safety and Environment, Tabriz petrochemical CO., Tabriz, Iran.
authors: Siavash
authors: S
authors: Derafshi
authors: Faculty of Chemical Engineering, Sahand University of Technology, Tabriz, Iran.
authors: Esmaeil
authors: E
authors: Fatehifar
mesh_terms: D001554:Benzene / Q000737:chemistry; D057919:Biological Oxygen Demand Analysis; D000068598:Data Accuracy; D055549:Volatile Organic Compounds / Q000737:chemistry*; D064091:Waste Disposal Facilities; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater / Q000737:chemistry; D018508:Water Purification
chemical_list: D001554:Benzene; D055549:Volatile Organic Compounds; D062065:Wastewater
keywords: Activated sludge; Data reconciliation; Performance evaluation; Petrochemical; Wastewater