Nitrite Accumulation during the Denitrification Process in SBR for the Treatment of Pre-treated Landfill Leachate

›› 2009, Vol. 17 ›› Issue (6): 1027-1031.

• BIOTECHNOLOGY AND BIOENGINEERING • Previous Articles Next Articles

Nitrite Accumulation during the Denitrification Process in SBR for the Treatment of Pre-treated Landfill Leachate

SUN Hongwei, YANG Qing, PENG Yongzhen, SHI Xiaoning, WANG Shuying, ZHANG Shujun

Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China

Received:2009-01-15 Revised:2009-06-06 Online:2009-12-28 Published:2009-12-28
Supported by:
Supported by the National Natural Science Foundation of China (50978003);the Natural Science Foundation of Beijing (8091001);the Funding Project for Academic Human Resources Development in Institutions of Higher Learning Under the Jurisdiction of Beijing Municipality (PHR 20090502);the State Key Laboratory of Urban Water Resource and Environment (HIT) (QAK200802)

Nitrite Accumulation during the Denitrification Process in SBR for the Treatment of Pre-treated Landfill Leachate

孙洪伟, 杨庆, 彭永臻, 时晓宁, 王淑莹, 张树军

Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China

通讯作者: PENG Yongzhen,E-mail:pyz@bjut.edu.cn; shw@emails.bjut.edu.cn
基金资助:
Supported by the National Natural Science Foundation of China (50978003);the Natural Science Foundation of Beijing (8091001);the Funding Project for Academic Human Resources Development in Institutions of Higher Learning Under the Jurisdiction of Beijing Municipality (PHR 20090502);the State Key Laboratory of Urban Water Resource and Environment (HIT) (QAK200802)

Abstract

Abstract: The nitrite accumulation in the denitrification process is investigated with sequencing batch reactor(SBR) treating pre-treated landfill leachate in anoxic/anaerobic up-flow anaerobic sludge bed(UASB).Nitrite accumulates obviously at different initial nitrate concentrations(64.9,54.8,49.3 and 29.5 mg·L^-1) and low temperatures,and the two break points on the oxidation-reduction potential(ORP) profile indicate the completion of nitrate and nitrite reduction.Usually,the nitrate reduction rate is used as the sole parameter to characterize the denitrification rate,and nitrite is not even measured.For accuracy,the total oxidized nitrogen(nitrate + nitrite) is used as a measure,though details characterizing the process may be overlooked.Additionally,batch tests are conducted to investigate the effects of C/N ratios and types of carbon sources on the nitrite accumulation during the denitrification.It is observed that carbon source is sufficient for the reduction of nitrate to nitrite,but for further reduction of nitrite to nitrogen gas,is deficient when C/N is below the theoretical critical level of 3.75 based on the stoichiometry of denitrification.Five carbon sources used in this work,except for glucose,may cause the nitrite accumulation.From experimental results and cited literature,it is concluded that Alcaligene species may be contained in the SBR activated-sludge system.

Key words: landfill leachate, nitrite accumulation, denitrification, C/N ratio, carbon source, sequencing batch reactor

摘要： The nitrite accumulation in the denitrification process is investigated with sequencing batch reactor(SBR) treating pre-treated landfill leachate in anoxic/anaerobic up-flow anaerobic sludge bed(UASB).Nitrite accumulates obviously at different initial nitrate concentrations(64.9,54.8,49.3 and 29.5 mg·L^-1) and low temperatures,and the two break points on the oxidation-reduction potential(ORP) profile indicate the completion of nitrate and nitrite reduction.Usually,the nitrate reduction rate is used as the sole parameter to characterize the denitrification rate,and nitrite is not even measured.For accuracy,the total oxidized nitrogen(nitrate + nitrite) is used as a measure,though details characterizing the process may be overlooked.Additionally,batch tests are conducted to investigate the effects of C/N ratios and types of carbon sources on the nitrite accumulation during the denitrification.It is observed that carbon source is sufficient for the reduction of nitrate to nitrite,but for further reduction of nitrite to nitrogen gas,is deficient when C/N is below the theoretical critical level of 3.75 based on the stoichiometry of denitrification.Five carbon sources used in this work,except for glucose,may cause the nitrite accumulation.From experimental results and cited literature,it is concluded that Alcaligene species may be contained in the SBR activated-sludge system.

关键词: landfill leachate, nitrite accumulation, denitrification, C/N ratio, carbon source, sequencing batch reactor

SUN Hongwei, YANG Qing, PENG Yongzhen, SHI Xiaoning, WANG Shuying, ZHANG Shujun. Nitrite Accumulation during the Denitrification Process in SBR for the Treatment of Pre-treated Landfill Leachate[J]. , 2009, 17(6): 1027-1031.

孙洪伟, 杨庆, 彭永臻, 时晓宁, 王淑莹, 张树军. Nitrite Accumulation during the Denitrification Process in SBR for the Treatment of Pre-treated Landfill Leachate[J]. , 2009, 17(6): 1027-1031.

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Nitrite Accumulation during the Denitrification Process in SBR for the Treatment of Pre-treated Landfill Leachate

Nitrite Accumulation during the Denitrification Process in SBR for the Treatment of Pre-treated Landfill Leachate

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