To study the effect of free cells (suspended bacteria) on performance of entrapped bacteria system (i.e. polyethylene glycol (PEG)-pellet reactor) to treat NH4-N contaminated groundwater, two PEG-pellet reactors with ...To study the effect of free cells (suspended bacteria) on performance of entrapped bacteria system (i.e. polyethylene glycol (PEG)-pellet reactor) to treat NH4-N contaminated groundwater, two PEG-pellet reactors with a lot of free cells - Reactor A containing PEG-pellet and Reactor B containing PEG-pellet and supporting material - and the another control reactor without free cells (Reactor C) were set-up. Three reactors were operated under various NH4-N concentrations (40-60 mg/L) and various temperatures (5-25oC). The results show that the free cells effected on the NH4-N removal efficiency significantly. The free cells developed to be a biofilm layer on the pellet surface for Reactor A, the biofilm layer caused the decreasing NH4-N diffusion and incomplete nitrification eventually. On the other hand, most free cells attached to the supporting material for Reactor B. Although the NH4-N could diffuse properly, the free cells consuming acetate caused the added acetate was insufficient for complete denitrification. However, the results suggest that the supporting material could reduce the effect of free cells on the reactor performance at low temperature as indicated by 1) higher efficiency and 2) lower activation energy (Ea) for nitrification and denitrification in Reactor B than Reactor A.展开更多
在温室中用 PEG 模拟干旱胁迫,比较了内生真菌感染(EI)和非感染(EF)的高羊茅(Festuca arundi-nacea Schreb.cv.Millennium)种群的几项与水分生理相关的指标.结果表明在对照和轻度胁迫时,EI 植株的分蘖、叶长、渗透势、游离脯氨酸含量及...在温室中用 PEG 模拟干旱胁迫,比较了内生真菌感染(EI)和非感染(EF)的高羊茅(Festuca arundi-nacea Schreb.cv.Millennium)种群的几项与水分生理相关的指标.结果表明在对照和轻度胁迫时,EI 植株的分蘖、叶长、渗透势、游离脯氨酸含量及生物量与 EF 种群相比都没有显著差异;重度胁迫条件下,复水后 EI 植株叶片展开程度明显大于 EF 植株,根系活力显著高于 EF 植株(P<0.05),说明重度干旱胁迫下内生真菌感染对高羊茅的恢复生长有一定的增益作用.展开更多
文摘To study the effect of free cells (suspended bacteria) on performance of entrapped bacteria system (i.e. polyethylene glycol (PEG)-pellet reactor) to treat NH4-N contaminated groundwater, two PEG-pellet reactors with a lot of free cells - Reactor A containing PEG-pellet and Reactor B containing PEG-pellet and supporting material - and the another control reactor without free cells (Reactor C) were set-up. Three reactors were operated under various NH4-N concentrations (40-60 mg/L) and various temperatures (5-25oC). The results show that the free cells effected on the NH4-N removal efficiency significantly. The free cells developed to be a biofilm layer on the pellet surface for Reactor A, the biofilm layer caused the decreasing NH4-N diffusion and incomplete nitrification eventually. On the other hand, most free cells attached to the supporting material for Reactor B. Although the NH4-N could diffuse properly, the free cells consuming acetate caused the added acetate was insufficient for complete denitrification. However, the results suggest that the supporting material could reduce the effect of free cells on the reactor performance at low temperature as indicated by 1) higher efficiency and 2) lower activation energy (Ea) for nitrification and denitrification in Reactor B than Reactor A.
文摘在温室中用 PEG 模拟干旱胁迫,比较了内生真菌感染(EI)和非感染(EF)的高羊茅(Festuca arundi-nacea Schreb.cv.Millennium)种群的几项与水分生理相关的指标.结果表明在对照和轻度胁迫时,EI 植株的分蘖、叶长、渗透势、游离脯氨酸含量及生物量与 EF 种群相比都没有显著差异;重度胁迫条件下,复水后 EI 植株叶片展开程度明显大于 EF 植株,根系活力显著高于 EF 植株(P<0.05),说明重度干旱胁迫下内生真菌感染对高羊茅的恢复生长有一定的增益作用.
