دانلود رایگان مقاله لاتین حذف بیولوژیکی نیترات از آب از سایت الزویر
عنوان فارسی مقاله:
حذف بیولوژیکی نیترات از آب و فاضلاب توسط فرایند نیترات سازی فاز جامد
عنوان انگلیسی مقاله:
Biological nitrate removal from water and wastewater by solid-phase denitrification process
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
creasing levels of nitrate in receiving waters have been becoming serious issues worldwide due to the intensive application of fertilizers and pesticides, and sewage irrigation. The high concentration of nitrate has the potential risks of eutrophication and toxic algal blooms in receiving waters (Ghafari et al., 2008). Nitrate is identified as one of the hazardous contaminants in drinking water because it can cause infantile methemoglobinemia (blue baby syndrome) and reduction of nitrate into nitrites in saliva might induce the formation of nitrosamines, which are known carcinogens (Matiju et al., 1992). The maximum admissible concentration limit of nitrate in drinking water is 10 mg L−1 as nitrate-nitrogen (NO3-N) set by the US Environmental Protection Agency and 50 mg L−1 as nitrate by World Health Organization to reduce the risks to human health (Tsai et al., 2004). Biological nitrification and denitrification is a very important topic in the field of water pollution control (Wang and Yang, 2004; Liu et al., 2005; Chen et al., 2006). Different technologies have been researched and developed for nitrate removal, including ion exchange, adsorption, membrane separation, electrodialysis, chemical denitrification and biological denitrification (Aslan and Turkman, 2003; Wang and Kang, 2005). Biological denitrification is conducted by denitrifying microbes which use nitrate as terminal electron acceptor, and organic and inorganic substances as electron donor and energy source for sustaining the microbial growth (Ines et al., 1998; Ghafari et al., 2008). There are two types of biological denitrification, heterotrophic and autotrophic. Autotrophic denitrifiers utilize hydrogen, iron or sulfur compounds as energy source and inorganic carbon compounds such as carbon dioxide and bicarbonate as carbon source (Karanasios et al., 2010). Heterotrophic denitrifiers which use organic carbon compounds as carbon source are the most common denitrifiers in nature (Van Rijn et al., 2006). Heterotrophic biological denitrification is considered to be more economically, practically on a large scale, and ultimately reduce nitrate to nitrogen gas with high selectivity (Ovez et al., 2006a; Schipper et al., 2010b). The traditional technique is to add the water soluble substances such as methanol, ethanol, acetic acid and glucose into the denitrification reactor (Modin et al., 2007; Bill et al., 2009). There are the risks of insufficient doses or overdosing that entails a deterioration of the effluent quality. A complex process control and continuous monitoring is demanded. Moreover, some liquid carbon sources such as methanol and ethanol have security risks during storage, transportation and operation owing to their toxicity and inflammability. Recently, solid-phase denitrification which uses solid substances involving natural plantslike materials and synthetic biodegradable polymers served as carbon source for denitrification and biofilm carriers, has proved to be a promising alternative to remove nitrate from water and wastewater (Hiraishi and Khan, 2003; Boley and Muller, 2005; Chu and Wang, 2016). This paper presents overview of the application of solid-phase denitrification for nitrate removal from water and wastewater. The types of solid carbon sources commonly used, the parameters affecting denitrifi- cation rate such as temperature and dissolved oxygen (DO), the characteristics and microbial community of biofilm attached on the biodegradable carriers, the adverse effects of solid-phase denitrification and the cost of denitrification are introduced and evaluated. The challenge of this technique and future outlook are proposed. The present paper would be useful for researchers and engineers in the field of nitrogen removal from water and wastewater.
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کلمات کلیدی:
Biological nitrate removal from water and wastewater ... - ResearchGate https://www.researchgate.net/.../305077789_Biological_nitrate_removal_from_water_an... Jul 11, 2016 - Official Full-Text Paper (PDF): Biological nitrate removal from water and ... technology for the removal of nitrate from water and wastewater. [PDF]Nitrate removal from groundwater using solid-phase denitrification ... www.bioline.org.br/pdf?st13097 by XM Wang - Cited by 11 - Related articles Mar 20, 2013 - nitrogen up to over 10 mg/L in the effluent water was observed with nitrate ... uncontrolled land discharges of raw and treated wastewater. (Shrimali and Singh ... adequate to remove nitrate from groundwater due to its stability and ... chemical–physical (ion exchange) and biological pro- cesses. Among ... Biological Nitrate Removal from Groundwater by Filamentous Media at ... jhsss.sums.ac.ir/index.php/jhsss/article/download/169/125 by L Keshtgar - 2016 - Related articles biological nitrate removal from water. Methods: In this experimental study, the effect of heterotrophic. Pseudomonas separated from Shiraz wastewater treatment ... Biological nitrate removal from water resources | SpringerLink link.springer.com/article/10.1007/BF03325935 by GRN Bidhendi - 2006 - Cited by 7 - Related articles Jun 25, 2006 - Abstract. During the recent decades, the increasing trends in nitrate ion concentration in ground water sources have meant more research to ... Nitrate Removal Technologies New Solutions To An ... - Water Online https://www.wateronline.com/.../nitrate-removal-technologies-new-solutions-to-an-old... Dec 10, 2014 - Biological nitrate removal is based on the following reaction that is ... wastewater systems for nitrate removal, primarily mine water at low ... Denitrification System - Sewage Treatment - Reverse Osmosis - Waste ... www.aesarabia.com/denitrification-system/ Denitrification is removal of Nitrates from water or waste water. ... Nitrification is a biological process that converts ammonia to nitrite and then to nitrate. Searches related to biological nitrate removal from water and wastewater nitrate in wastewater problem nitrate removal from wastewater denitrification google scholar
