期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
犁铧的修复与自制
1
作者 刘源溪 许贵海 郭晓红 《山西农机》 2000年第4期16-16,共1页
关键词 犁铧 修复 制造 铧式犁 盐渗工艺
下载PDF
Nitrite Accumulation during the Denitrification Process in SBR for the Treatment of Pre-treated Landfill Leachate 被引量:36
2
作者 孙洪伟 杨庆 +3 位作者 彭永臻 时晓宁 王淑莹 张树军 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2009年第6期1027-1031,共5页
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 I(UASB). Nitrite ... 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 I(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. 展开更多
关键词 landfill leachate nitrite accumulation DENITRIFICATION C/N ratio carbon source sequencing batch reactor
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部