Document Type : Research Paper
Authors
1 Department of Chemical Engineering, Faculty of Engineering, Arak University, Arak, Iran.
2 Department of Chemical Engineering, Faculty of Engineering, Arak University, Arak, Iran
3 Department of Mechanical Engineering, Faculty of Engineering, Arak University, Arak, Iran
Abstract
On average, 67 % of household wastewater is made up of greywater, which includes wastewater produced in household other than toilets. There are different biological treatment processes for greywater treatment. One of these systems is the sequencing batch reactor (SBR), which has proven to be an effective way of treating wastewater. One of the amendments to the SBR process is the intermittent cycle extended aeration system (ICEAS). The purpose of this study was to investigate the performance of an advanced-SBR in the bathroom greywater (BGW) treatment. For this purpose, a rectangular SBR reactor (402020 cm) with a working volume of 12 liters was developed and utilized. The primary microorganisms of this reactor were prepared from the active sludge return to the aeration pond of the Arak municipal wastewater treatment plant. The reactor was fed with the effluent from the initial settling ponds of the same treatment plant. After the system was set up and sufficient microorganisms were grown, the exploitation phase began with synthetic greywater. The experiments were carried out in three cycles of 4, 6 and 8 hours. The concentrations of linear alkyl benzene sulfonates (LAS), chemical oxygen demand (COD) and biochemical oxygen demand (BOD5) at the inlet were 6.8 mg/L, 385 mg/L and 170 mg/L, and in the outlet, 0.95 mg/L, 19.25 mg/L and 8.5 mg/L, in a 8-hour cycle. Therefore, the removal efficiency of the system in 8 h cycle was 86 %, 93 % and 95 %, respectively.
Keywords
APHA, AWWA, WEF. Standard Methods for the Examination of Water and Wastewater, 18th ed. American Public Health Association, (1992).
Boyjoo Y., Pareek V.K., Ang M., A review of greywater characteristics and treatment processes, Water Science and Technology 67 (2013) 1403-1424.
Chanakya H., Khuntia H.K., Treatment of gray water using anaerobic biofilms created on synthetic and natural fibers, Process Safety and Environmental Protection 92 (2014) 186-192.
Duarte I.C.S., De-Oliveira L.L., Okada D.Y., Do-Prado P.F., Varesche M.B.A., Evaluation of the microbial diversity in sequencing batch reactor treating linear alkylbenzene sulfonate under denitrifying and mesophilic conditions using swine sludge as inoculum, Brazil Archives of Biology and Technology (2015) 1-7.
Ehrampoush M.H., Karimi B., Rahimi S., Talebi P., Ghelmani V., A study of the removal rate of linear detergents and organics via subsurface constructed wetland from Yazd wastewater, Tolooe Behdasht 6 (2007) 74-84.
Eslami H., Talebi Hematabadi P., Ghelmani S.V., Salehi Vaziri A., Derakhshan Z., The Performance of Advanced Sequencing Batch Reactor in Wastewater Treatment Plant to Remove Organic Materials and Linear Alkyl Benzene Sulfonates, Journal of Health Sciences 7 (2015) 33-39.
Fernandes L., Effect of temperature on the performance of an SBR treating liquid swine-manure, Bioresource Technology 47 (1994) 219-227.
Ghahfarrokhi B.B., Ehramposh M.H., Nasiri P., Ghasemee A., Rezaee-Javanmardi R., Survey of amount of removed detergents and organic Materials of hospital wastewater with SBR developed method, Journal of Environmental Science and Technology 12 (2010) 61-70.
Hach Company, DR5000 Spectrophotometer Procedures Manual, 2nd ed. Printed in Germany, (2005).
Katukiza A.Y., Ronteltap M., Niwagaba C.B., Kansiime F., Lens P.N.L., Greywater treatment in urban slums by a filtration system: Optimisation of the filtration medium, Journal of Environmental Management 146 (2014) 131-141.
McAdam E., Judd S.J., Gildemeister R., Drews A., Kraume M., Critical analysis of submerged membrane sequencing batch reactor operating conditions, Water Research 39 (2005) 4011-4019.
Metcaf & Eddy. Wastewater Engineering: Treatment and Reuse. McGraw-Hill, USA, (2003).
Moslemi Zadeh S., Sustainability evaluation of shared greywater recycling in urban mixed-use regeneration areas. University of Birmingham, (2013).
Pirsaheb M., Khamutian R., Dargahi A., Efficiency of Activated Sludge Process (Extended Aeration) in Removal of Linear Alkyl Benzene Sulfonate (LAS) from Municipal Wastewater, Journal of Health 4 (2013) 249–59.
Penn R., Schütze M., Friedler E., Modelling the effects of on-site greywater reuse and low flush toilets on municipal sewer systems, Journal of Environmental Management 114 (2013) 72-83.
Redisher R.G. Surfactant Biodegradation. Marcel Decker, New York, (1990).
Scott M.J., and Jones M.N., The biodegradation of surfactants in the environment, Biochimica et Biophysica Acta 1508 (2000) 235-251.
Shamabadi N., Bakhtiari H., Kochakian N., Farahani M., The investigation and designing of an onsite greywater treatment systems at Hazrat-e-Masoumeh University, Qom, IRAN, Energy Procedia 74 (2015) 1337-1346.
Shin H.S., Minlee S., Seokseo I., Oungkim G., Holim K., Song J.S., Pilot-Scale SBR and MF operation for the removal of organic and nitrogen compounds from greywater, Water Science and Technology 38 (1998) 80-88.
Torben M.D., Environmental and health assessment of substances in household detergents and cosmetic detergent products. Danish EPA, (2001).
Tsoumachidou S., Velegraki T., Antoniadis A., Poulios I., Greywater as a sustainable water source: A photocatalytic treatment technology under artificial and solar illumination, Journal of Environmental Management 195 (2016) 232-241.
United State Environmental Protection Agency (USEPA). Wastewater technology fact sheet: sequencing batch reactors, Office of water, Washington D.C, (1999).
Wiltshire M. Greywater reuse in urban areas. University of Southern Queensland, (2005).
World Health Organization (WHO). Guidelines for the safe use of wastewater, excreta and greywater: Excreta and grey water reuse in agriculture, 4th ed. Geneva, (2006).
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