期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
Denitrification and Dephosphatation by Anaerobic/Anoxic Sequencing Batch Reactor 被引量:4
1
作者 彭永臻 李勇智 +1 位作者 王淑莹 王亚宜 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2004年第6期877-880,共4页
Removal of denitrifying phosphorus was verified in a laboratory anaerobic/anoxic sequencing batch reactor (A/A SBR). The results obtained demonstrated that the anaerobic/anoxic strategy can enrich the growth of denitr... Removal of denitrifying phosphorus was verified in a laboratory anaerobic/anoxic sequencing batch reactor (A/A SBR). The results obtained demonstrated that the anaerobic/anoxic strategy can enrich the growth of denitrifying phosphorus removing bacteria (DPB) and take up phosphate under anoxic condition by using nitrate as the electron acceptor. The phosphorus removal efficiency was higher than 90% and the effluent phosphate concentration was lower than 1 mg·L-1 after the A/A SBR was operated in a steady-state. When the chemical oxygen demand(COD) of influent was lower than 180mg· L-1, the more COD in the influent was, the higher efficiency of phosphorus removal could be attained under anoxic condition. However, simultaneous presence of carbon and nitrate would be detrimental to denitrifying phosphorus removal. Result of influence of sludge retention time (SRT) on denitrifying phosphorus removal suggested that the decrease of SRT caused a washout of DPB and consequently the enhanced biological phosphorus removal decreased with 8 days SRT. When the SRT was restored to 16 days, however, the efficiency of phosphorus removal was higher than 90%. 展开更多
关键词 denitrifying phosphorus removal anoxic phosphorus uptake biologicalphosphorus removal denitrifying phosphorus removing bacteria
下载PDF
Effects of Nitrate Concentration in Main Anoxic Zone on Denitrifying Dephosphatation 被引量:1
2
作者 尹军 王晓玲 +2 位作者 祝贵兵 叶龙 吴相会 《Journal of Donghua University(English Edition)》 EI CAS 2009年第4期443-449,共7页
The effects of nitrate concentration in the main anoxic zone on denitrifying dephosphatation capability were conducted based on modified University of Cape Town (MUCT) process. Meanwhile the relation between optimal... The effects of nitrate concentration in the main anoxic zone on denitrifying dephosphatation capability were conducted based on modified University of Cape Town (MUCT) process. Meanwhile the relation between optimal nitrate concentration (Nopt) and influent C/N ratio was evaluated, in which the influont chemical oxygen demand (COD) concentration was stabilized at (2905:10)mg/L, the influent total phosphorus (TP) concentration was stabilized at (7.0±0. 5)mg/L. The results indicated that: (1) the nitrate concentration in the main anoxic zone had an effect on denitrifying dephosphatation capability, and the average percentages of anoxic phosphorus uptake in total phosphorus uptake (ηa) increased with nitrate cancentration increasing, i.e., increasing from 62.1% at2.0 mg/L to63.7%, 65.6%, 68.1%, and 72.3% at 2.2, 2.4, 2.6 and 2.8mg/L, respectively; (2) the Nopt as function of influent C/N ratio could be calculated by the equation: y = 0.67x^2-7.79x + 22. 21; the maximum percentages of anoxic phosphorus uptake in total phosphorus uptake (ηa,max) as function of the Nopt could be calculated by the equation: y=0.77-0.33e^-(x/1.52). The Nopt was the important control parameter that must be optimized for operation of conveational biological nutrieat removal activated sludge (BNRAS) system. 展开更多
关键词 MUCT process denitri fying de phosphatation nitrate concentration anoxic phosphorus uptake
下载PDF
Biomass Fraction of Phosphate-Accumulating Organisms Grown in Anoxic and Aerobic Stages under Optimum Nitrate Concentration
3
作者 王晓玲 李娜 +3 位作者 谢添 张芳 董利鹏 殷宝用 《Journal of Donghua University(English Edition)》 EI CAS 2014年第3期278-286,共9页
The effects of nitrate concentration on the capability of phosphorus uptake in the main anoxic stage were investigated.Meanwhile, the biomass fractions — heterotrophs, phosphateaccumulating organisms( PAOs),and nitri... The effects of nitrate concentration on the capability of phosphorus uptake in the main anoxic stage were investigated.Meanwhile, the biomass fractions — heterotrophs, phosphateaccumulating organisms( PAOs),and nitrifying organisms in a pilot-scale enhanced biological phosphorus removal( EBPR) system— were both experimentally and theoretically evaluated( from the mass balance calculations of organic matter, nitrogen and phosphorus),under optimum nitrate concentration in the main anoxic stage,in which the influent chemical oxygen demand( COD)concentration was stabilized at( 290 ± 10) mg·L- 1and the influent total phosphorus( TP) concentration was stabilized at( 7. 0 ± 0. 5)mg · L- 1. In long term operations,the process exhibited high performance in removing organic matter, nitrogen, and phosphorus. Approximately 46. 41% of organic matter,57. 21% of nitrogen,and 48. 14% of phosphorus were removed from the influent in the form of carbon dioxide,nitrogen gas,and polyphosphate,respectively. XH( heterotrophs),XPAO( PAOs),and XAUT( autotrophs) were regarded as the major organisms responsible for biomass production. The yield fractions of XHgrowth in the first anoxic,the second anoxic,and the aerobic stages were 10. 24%,19. 11%,and 19. 71%,respectively; the yield fractions of XPAO growth in the second anoxic and the aerobic stages were 24. 34% and19. 86%,respectively; the yield fraction of XAUTgrowth in the aerobic stage was 6. 74%. These results showed that XHand XPAOformed the major community. Moreover,a higher amount of XPAOgrowth on stored poly-hydroxyalkanoates( PHAs) under the anoxic condition was seen in this EBPR system for municipal wastewater treatment. 展开更多
关键词 biomass anoxic phosphorus uptake HETEROTROPHS phosphate-accumulating organisms nitrifying organisms
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部