Nitrate and pesticides removal from contaminated water using biodenitrification reactor

Aslan, Şükrü; Türkman, Ayşen

doi:10.1016/j.procbio.2005.11.004

Cited by 49 publications

(19 citation statements)

References 19 publications

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“…Many researchers have confirmed that denitrification rates are strongly dependent on HRT or flow rates (Soares and Abeliovich 1998;Kesseru et al 2003;Aslan and Turkman 2006;Behera et al 2007). Moreover, HRT affects nitrite accumulation in the effluent (Soares and Abeliovich 1998;Aslan and Turkman 2006).…”

Section: Effect Of Hrt On Denitrification Performancementioning

confidence: 96%

“…Concern over nitrate contamination is due to health problems related to methemoglobinemia in infants (blue baby syndrome) because nitrate converts to nitrite in the body and reacts with Fe(II) in hemoglobin to oxidize it to Fe(III), which limits the oxygen carrying capacity of blood. In addition, consuming nitrate-contaminated water can result in cancer of the alimentary canal (Vosoughifar et al 2005;Aslan and Turkman 2006). As a result, relevant standards have been set for nitrate content in drinking water by various agencies.…”

Section: Introductionmentioning

confidence: 99%

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Nitrate removal from groundwater using solid-phase denitrification process without inoculating with external microorganisms

Wang

2013

Int. J. Environ. Sci. Technol.

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Denitrification of groundwater was studied using a laboratory-scale reactor packed with biodegradable snack ware served as both carbon source and biofilm support for microorganisms. The complete removal of 50 mg/L of nitrate-nitrogen was achieved in a 23-day-old reactor with 2.1 h of hydraulic retention time without inoculating with any external microorganisms, which indicates that indigenous microorganisms in groundwater proliferate readily and result in stable biofilm formation onto biodegradable snack ware. Accumulation of nitrite and nitrate residue was detected when hydraulic retention time was lower than 2.1 h. The breakthrough of nitratenitrogen up to over 10 mg/L in the effluent water was observed with nitrate removal efficiency reducing to about 75 % when hydraulic retention time was lowered to 1.4 h. The highest rate of denitrification was observed with 1.5 h of hydraulic retention time. Dissolved organic carbon concentration in the effluent water ranged between 10 and 20 mg/L during the stable operation of the reactor, and nitrite-nitrogen concentration was never higher than 0.09 mg/L. Considering its relatively low price and high denitrification rate, biodegradable snack ware can become a good alternative for denitrification process.

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Section: Effect Of Hrt On Denitrification Performancementioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Nitrate removal from groundwater using solid-phase denitrification process without inoculating with external microorganisms

Wang

2013

Int. J. Environ. Sci. Technol.

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“…The HRT of the biological reactor is a very important parameter for nitrate removal (Soares and Abeliovich 1998;Kesser} u et al 2002;Aslan and Turkman 2006;Behera et al 2007). Since the majority of denitrifiers are mesophilic, their metabolic activity would slow down along with the fall of environment temperature.…”

Section: Effect Of Hrt On Denitrification At 12°cmentioning

confidence: 99%

“…Thus, HRT plays an important role in the denitrification performance of the system support by BSW. The low HRT value resulted in a decrease in nitrate removal and an increase in nitrite accumulation because of the low contact time for microbial activity, wash-out of bacteria and extracellular enzymes (Soares and Abeliovich 1998;Aslan and Turkman 2006;Behera et al 2007). Although Aslan (2005) suggested that effluent DOC increased by two times at 2-h residence time than that at 7-h residence time using ethanol as carbon source, significant differences in the DOC concentration in the treated water were not observed when HRT value was varied from 2 to 5 h in this study (Fig.…”

Section: Effect Of Hrt On Denitrification At 12°cmentioning

confidence: 99%

Denitrification of nitrate-contaminated groundwater using biodegradable snack ware as carbon source under low-temperature condition

Wang

2011

Int. J. Environ. Sci. Technol.

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A considerable increase in nitrate concentration in groundwater has been observed in many countries. This research focuses on nitrate removal using biodegradable snack ware (BSW) as both carbon source and biofilm support for denitrifiers. The denitrification efficiency of a laboratory-scale denitrification reactor packed with BSW was examined in a low-temperature condition. The nitrate removal efficiency supported by BSW decreased to approximately 40% at 12°C from nearly 100% at 25°C with 50 mg/L of nitrate-nitrogen in the influent and 2 h of hydraulic retention time (HRT). The complete nitrate removal was obtained when nitrate-nitrogen concentration was no more than 15 mg/L at 2 h of HRT and at 12°C. If the initial concentration of nitrate-nitrogen was 50 mg/L, 5 h of HRT was needed for the complete nitrate removal. Nitrite concentration in the treated water decreased evidently as HRT was increased from 2 to 5 h, or as nitratenitrogen concentration in the influent decreased to 15 mg/L from 50 mg/L. It was observed that varying HRT and nitrate concentration in the influent had no noticeable effect on dissolved organic carbon content in the effluent under the experimental conditions. This study indicated that the complete nitrate removal could be achieved readily even at 12°C using BSW as carbon source by changing HRT or the initial concentration of nitrate in the influent, which has some useful implications in environmental engineering practice.

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“…As well as, application of nitrate removal technologies from drinking water e.g. biological processes (36,37), absorbents (41), electro dialysis (38,39), electrocoagulation (40,41) and other methods (46) can be considered as other approaches. Also for identification of nitrate sources in groundwater, application of nitrate and Oxygen (42) isotopes has been studied by Khayat et al 2006 (43).…”

Section: Discussionmentioning

confidence: 99%

Natural Arsenic Pollution and Hydrochemistry of Drinking Water of an Urban Part of Iran

Mosaferi¹,

Shakerkhatibi²,

Dastgiri³

et al. 2014

Avicenna J Environ Health Eng

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Natural contamination of surface and groundwater resources with arsenic is a worldwide problem. The present study aimed to investigate and report on the quality of drinking water resources with special focus on arsenic presence in an urban part of Iran. Arsenic concentrations were measured by graphite furnace atomic absorption spectroscopy (GFAAS). In both surface and groundwater samples, arsenic concentrations ranged from 6 -61 µg/L with an average value of 39 ± 20 µg/L. Concentration of arsenic, which was up to six times greater than guideline values (10 µg/L) indicates the presence of arsenic bearing materials in the geological structure of the region. It was found that the quality of treated surface water produced by the water treatment facility was good in respect to arsenic (9 µg/L) and solid content (EC = µs/cm). However, in drinking water samples of wells, total solids (mean EC = 1580 ± 150 µs/cm), total hardness (mean = 479 + 94 mg/L as CaCO3) and arsenic (mean = 42 + 16 µg/L) were significantly higher. Correspondingly, there was a significant correlation between arsenic concentration and EC, Na+, K + and Cl -values. The type of water in most of groundwater samples (70%) was determined as HCO 3-Na + . Considering the population of the city and probable health effects due to exposure to arsenic through drinking water, comprehensive measures as well as application of arsenic removal processes in water treatment facilities and replacement of contaminated wells with safe wells are required.

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Nitrate and pesticides removal from contaminated water using biodenitrification reactor

Cited by 49 publications

References 19 publications

Nitrate removal from groundwater using solid-phase denitrification process without inoculating with external microorganisms

Nitrate removal from groundwater using solid-phase denitrification process without inoculating with external microorganisms

Denitrification of nitrate-contaminated groundwater using biodegradable snack ware as carbon source under low-temperature condition

Natural Arsenic Pollution and Hydrochemistry of Drinking Water of an Urban Part of Iran

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