Anaerobic degradation pathway and kinetics of domestic wastewater at low temperatures

Expression of the regulatory stress rpoS gene controls the transcription of cspA genes, which are involved in survival and adaptation to low temperatures. The purpose of this study was to assess the growth kinetics of naturally occurring V. parahaemolyticus in shellstock oysters and in vitro and the cold-shock-induced expression of the rpoS and cspA gene response in vitro during postharvest refrigeration. Naturally contaminated eastern oysters (Crassostrea virginica) and pathogenic (Vp-tdh) and nonpathogenic (Vp-tlh) isolates were stored at 7 ± 1 °C for 168 h and 216 h, respectively. The regulatory stress (rpos) and cold-shock (cspA) gene expressions were determined by reverse transcription PCR. At 24 h, the (Vp-tdh) strain grew faster (p < 0.05) than the (Vp-tlh) strain in oysters (λ = 0.33, 0.39, respectively) and in vitro (λ = 0.89, 37.65, respectively), indicating a better adaptation to cold shock for the (Vp-tdh) strain in live oysters and in vitro. At 24 h, the (Vp-tdh) strain rpoS and cspA gene expressions were upregulated by 1.9 and 2.3-fold, respectively, but the (Vp-tlh) strain rpoS and cspA gene expressions were repressed and upregulated by −0.024 and 1.9-fold, respectively. The V. parahaemolyticus strains that were isolated from tropical oysters have adaptive expression changes to survive and grow at 7 °C, according to their virulence.

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Kinetics of the C6H5 + O2 Reaction at Low Temperatures

Journal of the American Chemical Society ◽

10.1021/ja00100a022 ◽

1994 ◽

Vol 116 (21) ◽

pp. 9571-9576 ◽

Cited By ~ 74

Author(s):

T. Yu ◽

M. C. Lin

Keyword(s):

Low Temperatures ◽

Kinetics Of

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Deformation kinetics of commercial Ti-50A (0.5 At. Pct Oeq) at low temperatures (T<0.3T m )

Metallurgical Transactions A ◽

10.1007/bf02668896 ◽

1983 ◽

Vol 14 (12) ◽

pp. 2545-2556 ◽

Cited By ~ 11

Author(s):

Chih-An Yin ◽

M. Döner ◽

H. Conrad

Keyword(s):

Low Temperatures ◽

Deformation Kinetics ◽

Kinetics Of

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Effect of magnetic powder on nitrous oxide emissions from a sequencing batch reactor for treating domestic wastewater at low temperatures

Bioresource Technology ◽

10.1016/j.biortech.2020.123848 ◽

2020 ◽

Vol 315 ◽

pp. 123848 ◽

Cited By ~ 1

Author(s):

Chuanwen Feng ◽

Zhihao Li ◽

Yuanmo Zhu ◽

Dan Xu ◽

Jinju Geng ◽

...

Keyword(s):

Nitrous Oxide ◽

Low Temperatures ◽

Sequencing Batch Reactor ◽

Batch Reactor ◽

Domestic Wastewater ◽

Nitrous Oxide Emissions ◽

Magnetic Powder

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Ozonation of bromide-containing drinking waters:a delicate balance between disinfection and bromate formation

Water Science & Technology ◽

10.2166/wst.2000.0115 ◽

2000 ◽

Vol 41 (7) ◽

pp. 53-59 ◽

Cited By ~ 34

Author(s):

U. von Gunten ◽

U. Pinkernell

Keyword(s):

Temperature Dependence ◽

Low Temperatures ◽

The Other ◽

Ozone Exposure ◽

Oh Radicals ◽

Strong Temperature Dependence ◽

Control Options ◽

The One ◽

Kinetics Of ◽

Ozonation Process

The occurrence of Cryptosporidium in raw waters and bromate formation during ozonation of bromide-containing waters leads to a difficult optimisation of ozonation processes. On the one hand inactivation of Cryptosporidium requires high ozone exposures, on the other hand under these conditions bromate formation is favored. In order to overcome this problem we need information about (i) the oxidant concentrations (ozone and OH radicals) during an ozonation process, (ii) kinetics of the inactivation of Cryptosporidium, (iii) kinetics and mechanism of bromate formation, and (iv) the reactor hydraulics. The strong temperature dependence of the inactivation of Cryptosporidium which results in a higher ozone exposure (time-integrated action of ozone) at low temperatures makes it more difficult to fulfil disinfection and bromate standards at low temperatures. Underthese conditions control options for bromate formation can be applied. Depressionof pH and addition of ammonia have been selected to be the best options. For a given ozone exposure both measures lead to a reduction of bromate formation in the order of 50%.

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