title: Intrinsic kinetics for fixed bed bioreactor in hospital wastewater treatment.
abstract: Variation in hospital wastewater (HWW) pollutants and differences with municipal wastewater (MWW), make the use of biokinetic coefficients obtained from activated sludge in the MWW treatment unprofitable for designing, modeling and evaluation of biological processes for HWW treatment. Since this study was conducted to evaluate the performance and biokinetic coefficients of a fixed bed bioreactor (FBBR) using rice husks as fixed media in HWW treatment, a new modified method was also proposed for biokinetic estimation in FBBR processes. For these purposes, five hydraulic retention times along with five sludge retention times were introduced to a pilot setup and the required data were attained. The performance process for chemical oxygen demand (COD) removal was significant (87.8-97.5%) in different conditions. The values of biokinetic coefficients k, Ks, Y and Kdwere obtained as 2.42 (day-1), 55.5 (mgCOD/L), 0.2929 (mgBiomass/mgCOD) and 0.0164 (day-1), respectively. The rice husks with high surface area and high affinity for biomass accumulation on its surface are promising media for a green and environmentally friendly FBBR process. The kinetics parameters values are utilizable for modeling of FBBR using rice husks as fixed media in HWW treatment.
authors: Department of Health in Disasters and Emergencies, University of Social Welfare and Rehabilitation, Tehran, Iran.
authors: Mehrdad
authors: M
authors: Farrokhi
authors: Department of Environmental Health Engineering, School of Health, Guilan University of Medical Sciences, Rasht, Iran and Department of Environmental Health Engineering, College of Medical Sciences, Tarbiat Modares University, Tehran, Iran E-mail: mmp368@gmail.com.
authors: Mostafa
authors: M
authors: Mahdavianpour
authors: Department of Environmental Health Engineering, School of Health, and Research Center of Health and Environment, Guilan University of Medical Sciences, Rasht, Iran and Department of Environmental Health Engineering, School of Health, Iran University of Medical Sciences, Tehran, Iran.
authors: Mehdi
authors: M
authors: Shirzad-Siboni
authors: Department of Environmental Health Engineering, School of Health, Guilan University of Medical Sciences, Rasht, Iran.
authors: Mohammad
authors: M
authors: Naimi-Joubani
authors: Department of Environmental Health Engineering, School of Health, Qazvin University of Medical Sciences, Qazvin, Iran.
authors: Hamzeh Ali
authors: HA
authors: Jamali
mesh_terms: D057919:Biological Oxygen Demand Analysis; D018533:Biomass; D019149:Bioreactors; D006761:Hospitals; D007700:Kinetics; D010865:Pilot Projects; D012722:Sewage / Q000032:analysis*; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*; D062065:Wastewater / Q000032:analysis*
chemical_list: D012722:Sewage; D062065:Wastewater