Studies on influence of process parameters on simultaneous biodegradation of atrazine and nutrients in aquatic environments by a membrane photobioreactor
- Environmental Science and Technology Research Center, Department of Environmental Health Engineering, Shahid Sadoughi University of Medical Sciences, Yazd (Iran, Islamic Republic of)
- Center for Solid Waste Research (CSWR), Institute for Environmental Research (IER), Tehran University of Medical Sciences, Tehran (Iran, Islamic Republic of)
- Nutrition Research Center, Department of Food Hygiene and Quality Control, School of Nutrition and Food Sciences, Shiraz University of Medical Sciences, Shiraz (Iran, Islamic Republic of)
- Research Center for Health Sciences, Department of Environmental Health, School of Health, Shiraz University of Medical Sciences, Shiraz (Iran, Islamic Republic of)
- Research Center for Health Sciences, Department of Occupational Health Engineering, School of Health, Shiraz University of Medical Sciences, Shiraz (Iran, Islamic Republic of)
- Université de Toulouse, INPT, UPS, Laboratoire de Génie Chimique, 4 Allée Emile Monso, F31432 Toulouse (France)
Highlights: • Membrane photobioreactor was tested for atrazine, COD and nutrients removal. • All target pollutants were removed in MPBR systems. • High biomass accumulation and changes in the biomass composition was observed. • A high quality effluent was recorded in the MPBR. A Lab scale algal-bacterial membrane photobioreactor (MPBR) was designed and operated under 12-h light and 12-h dark conditions with a light intensity of 8000 lx, in order to investigate the effects of initial concentrations of atrazine, carbon concentration, and hydraulic retention time on the ability of this photobioreactor in simultaneous removal of atrazine and nutrients in the continuous mode. The removal efficiencies of atrazine (ATZ), chemical oxygen demand (COD), phosphorus (PO{sub 4}{sup 3-}-P) and nitrogen (NOx) in optimum condition was more than 95%, 99%, 98% and 97% when the maximum removal rates were 9.5 × 10{sup −3}, 99.231, 11.773 and 7.762 mg/L-day, respectively. Results showed that the quality of the effluent was reduced by the increase of atrazine concentration. The outcomes on the hydraulic and toxic shocks indicated that the system has a relatively good resistance to the shocks and can return to the stable conditions. Microalgae showed a great deal of interest and capability in cultivating and attaching to the surface of the membrane and bioreactor, and the total biomass accumulated in the system was greater than 6 g/L. The kinetic coefficients of atrazine removal were also studied using various kinetic models. The maximum atrazine removal rate was determined by the modified Stover-Kincannon model. The results approved the ability of the MPBR reactor in wastewater treatment and microalgae cultivation and growth. The decline of atrazine concentration in this system could be attributed to the algal-bacterial symbiosis and co-metabolism process. Accordingly, the MPBR reactor is a practical, simple, economical and therefore suitable process for simultaneous biodegradation of chlorinated organic compounds and nutrients removal from aquatic environments.
- OSTI ID:
- 23100667
- Journal Information:
- Environmental Research, Vol. 161; Other Information: Copyright (c) 2017 Elsevier Inc. All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0013-9351
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AGRICULTURAL WASTES
ATRAZINE
BIODEGRADATION
BIOMASS
CHEMICAL OXYGEN DEMAND
CULTIVATION
ECOLOGICAL CONCENTRATION
HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY
HYDRAULICS
METABOLISM
ORGANIC FLUORINE COMPOUNDS
PHOSPHATES
POLLUTANTS
POLYVINYLS
SYMBIOSIS
TOXICITY
WASTE WATER
WATER TREATMENT