Removal of nitrate by Micro - algae biofilm in biological basin to advanced wastewater treatment
Subject Areas : Environment Pullotion (water and wastewater)Roya Mafi Gholami 1 , Alireza mofarej kochaki 2 , Sadegh Ghasemi 3
1 - Department of Environment Engineering, West Tehran Branch, Islamic Azad University, Tehran, Iran
2 - Department of Environment (Environment Engineering), Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
3 - Young Researchers and Elite Club, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
Keywords: Micro – Algae, Biofilm, Nitrate, Urban Wastewater, Biological Removed.,
Abstract :
Introduction and objective: Population growth is leading to increasing consumption of different resources and wastes producing as well as various types of wastewater generation; so different types of waste and their management have become the human challenges in the new era. In this study, the effects of microalgae biofilm refining for nitrate removal in urban wastewater was examined.
Material and method: For this purpose, 4 treatment pilots with 3 repetitions under two regimes of thermal conditions (25 and 30 °C) and lighting hours (12 and 24 hour) were implemented and during the 3 consecutive days and in each day 2 times per 12 hours sampling was carried out .
Results and Discussion: the results at the end of the third day of the experiment (after 72 h) showed that the Micro - algae biofilm was able to remove nitrate up to 79.76 % of wastewater under the conditions of 30°C temperature and the light radiation of 12 hours per day, respectively.This result was obtained from 41.82 percent related to the removal of bacteria in wastewater and 37.94 percent of the removal related to activity Micro – algae.
Conclusions: These achievements show the ability of Micro - algae biofilm in reduction of nitrates from wastewater and its application as a complementary in secondary and advanced urban wastewater treatment process.
1- Della Rocca, C., Belgiorno, V., Meric, S.,2007. Overview of in-situ applicable nitrate removal processes. Disalination, 204(1-3): 46-62.
2- Iran Enviornmental protection Agency. Envronmental Standards and Criteria.
3- World Health Organization. Guidelines for drinking water quality. WHO Pub .2004 .1(3):417-420.
4- Till, B A., Weathers, LJ., Alvarez, PJ.,1998. Fe(0)-supported autotrophic denitrification. Environmental Science & technology, 32(5): 634-639.
5- Weyer, PJ., Cerhan, JR., Kross, BC., Hallberg, GR., Kantamneni, J., Breuer, G.,2001. Municipal drinking water nitrate level and cancer risk in older women: the Lowa women health study. Epidemiolog, 12(3):327-338.
6- Ward, MH., Dekok, TM., Levallois, P., Brender, J.,2005. Drinking water Nitrate and health – recent findings and research needs. Environ Health prespect, 113:1607-1614.
7- Coss, A., Cantor, KP., Reif, JS., Lynch, CF.,2004. pancreatic cancer and drinking water and dietary sources of nitrate and nitrite. Am J Epidemiol, 159:693-701.
8- Oztürk, N., Bektaş, TE. 2004. Nitrate removal from aqueous solution by adsorption on to various materials. J Hazrd Mater, 112:155- 162.
9- Yang, G., Lee, HL. 2005. Chemical reduction of nitrate by nanosized iron: kinetics and pathways. Water research, 39(5): 884-894.
10- Faramarzi. Mohammad Ali, Foroutan Far. Hamid and Shakibaei. Mojtaba, 2010, Microalgae Biotechnology, Tehran Medical Sciences Publications.
11- Munoz, P., Guieysse, B., 2006. Algal-bacterial processes for the treatment of hazardous contaminants: a review. Water Research, 40: 2799-2815.
12- Mesdaghinia. Alireza, 1999, Accelerating phosphorus removal from wastewater with changes in bioreactor, Second National Conference on Environmental Health. Ministry of Health, Treatment and Medical Education, Tehran University of Medical Sciences and Health Services.
13- Vosoughi. Manouchehr and Tavakoli. Majid, 2005, Studies of a packed bed bioreactor for nitrate removal in industrial wastewater, Journal of Environmental Sciences, Volume 3. Issue 9.
14- Mostajaran. Akbar and Yahyaabadi. Sima, 2006, Reducing industrial wastewater pollution by green algae (spirogyra) and blue-green algae (Oscillatoria and Anabaena), Quarterly Scientific Research Journal of Water and Wastewater, Volume 17. Issue 1.
15- 16- Foladian. Abbas and Alizadeh. Behrouz, 2011, Study of the growth rate and absorption of nitrate and phosphate from treated hospital wastewater by aquatic plants Azolla and Lemna, 14th National Conference on Environmental Health, Yazd, Iran.Sukacova, K., Trtı´lek, M., Rataj, T.,.2015. Phosphorus removal using a microalgal biofilm in a new biofilm photobioreactor for tertiary wastewater treatment. water research Journal, 71: 55–63.
16- Riahi. Hossein, 2002, Algology, Alzahra University Publications.
17- Aziz, M.A., Ng, W.J. 2009. Feasibility of wastewater treatment using the activated algae process. Bioresource Technology, 40(3): 205-208.
18- Koening, L.M., Demacedo, J.S. 2004. Urban secondary sewage: an alternatve medium for the culture of Tetraselmis chuii (Prasinophyceae) and Dunaliella viridis (Chlorophyceae). Brazilian Archives of Biology and Technology, 47(3): 451-459.
19- Kian Mehr. Hormozdiar, 1992, Fundamentals of Algology, Jihad Daneshgahi Publishing House, Mashhad.
