EFFECTS OF ALKALINITY AND ORGANIC MATTER ON SULFUR UTILIZING AUTOTROPHIC DENITRIFICATION

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AMINZADEH B.; TORABIAN A.; AZIMI A.A.; NABI BIDHENDI GH.R.; MEHRDADI N.; FADAEI S.M.

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Journal: Journal of Environmental Studies Year:2009 | Volume:35 | Issue:50 Page(s): 63-72

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Title

EFFECTS OF ALKALINITY AND ORGANIC MATTER ON SULFUR UTILIZING AUTOTROPHIC DENITRIFICATION

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Keywords

SULFUR BASED AUTOTROPHIC DENITRIFICATIONQ3

HETEROTROPHIC NITRATEQ3

ORGANIC MATTERQ2

ALKALINITYQ3

WASTEWATERQ3

Abstract

Increasing nitrate concentration of surface and groundwater resources in different countries is considered as a common environmental problem, which is threatening the water quality all around the world. In Iran the concentration of nitrate in groundwater resources have exceeded the acceptable limits. This is due to the increase of agricultural and industrial activities and the excessive land discharge of treated and untreated WASTEWATERs which mostly occurs in the urban and rural areas like Tehran, Mashhad and Isfahan. The high amount of nitrate causes adverse effects on water ecosystems. Furthermore, high concentration of this contaminant in drinking water may result in health risks like methemoglobinemia in infants and children, childhood diabetes and formation of carcinogenic compounds like nitrosamines.Among different physical, chemical and biological nitrate removal processes, biological denitrification is considered as an efficient and inexpensive method. A wide range of heterotrophic and autotrophic bacteria consume nitrate as a final electron acceptor. In the heterotrophic denitrification, heterotrophic denitrifying bacteria, like Achromobacter and Pseudomonas consume ORGANIC MATTERs as electron donors. While in the autotrophic denitrification autotrophic denitrifying bacteria, like Paracoccus denitrificans and Thiobaci/lus denitrificans consume inorganic compounds like sulfide, sulfur, molecular hydrogen, thiosulfate and Fe++ as electron donors. However, both processes may encounter some deficiencies during the treatment process. During t his process, some problems related to Heterotrophic denitrification may rise up. These problems are mostly due to the need for an external organic carbon source in the case of WASTEWATERs containing low C/N ratio, need for post treatment of the remained organic carbon removal, excess sludge production and its relevant costs and nitrite accumulation. On the other hand, autotrophic denitrification may encounter problems like ALKALINITY consumption particularly at high-nitrate, low ALKALINITY of WASTEWATER, high sulfate production and low nitrate removal ratio…..

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APA: Copy

AMINZADEH, B., TORABIAN, A., AZIMI, A.A., NABI BIDHENDI, GH.R., MEHRDADI, N., & FADAEI, S.M.. (2009). EFFECTS OF ALKALINITY AND ORGANIC MATTER ON SULFUR UTILIZING AUTOTROPHIC DENITRIFICATION. JOURNAL OF ENVIRONMENTAL STUDIES, 35(50), 63-72. SID. https://sid.ir/paper/3103/en

Vancouver: Copy

AMINZADEH B., TORABIAN A., AZIMI A.A., NABI BIDHENDI GH.R., MEHRDADI N., FADAEI S.M.. EFFECTS OF ALKALINITY AND ORGANIC MATTER ON SULFUR UTILIZING AUTOTROPHIC DENITRIFICATION. JOURNAL OF ENVIRONMENTAL STUDIES[Internet]. 2009;35(50):63-72. Available from: https://sid.ir/paper/3103/en

IEEE: Copy

B. AMINZADEH, A. TORABIAN, A.A. AZIMI, GH.R. NABI BIDHENDI, N. MEHRDADI, and S.M. FADAEI, “EFFECTS OF ALKALINITY AND ORGANIC MATTER ON SULFUR UTILIZING AUTOTROPHIC DENITRIFICATION,” JOURNAL OF ENVIRONMENTAL STUDIES, vol. 35, no. 50, pp. 63–72, 2009, [Online]. Available: https://sid.ir/paper/3103/en

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