Tomato plants were grown under either a high (11-14%; Air treatment), a moderate (5.8-7%; Control) or a low (0.8-1.5%; Nitrogen treatment) oxygen concentration and inoculated or not with the pathogen. The high oxygen treatment resulted in a marked increase in plant …

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The inhibition increases with oxygen concentration and is about 30% in an atmosphere of 21% O 2 and 0.03% Co. 2. Undoubtedly, therefore, oxygen in normal air exerts a strong inhibitory effect on photosynthetic Co 2 fixation of land plants under natural conditions. The inhibitory effect of oxygen is rapidly produced and fully reversible.

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plant growth by affecting the sediment content and dissolved oxygen levels. Extremely fast flow leads to high oxygen content, so less sediment can settle to the floor for organisms to use as habitat. However, stagnant water may have high amounts of settled sediment, but not enough dissolved oxygen to support life (Giller & Malrnqvist 1998). In

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concentrations are required. Conventionally the dissolved oxygen (DO) concentration is kept higher than 2 mg/l to avoid depletion of oxygen. In many plants DO concentrationis kept even higher to ensure good effluent quality since it has previously been shown that this has positive influence on the floc formation (Wilén and Balmér, 1999).

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The maximum growth rate of both nitrification reactions are reported to be affected by dissolved oxygen concentration over the range of 0.3 mg l −1 to as much as 4.0 mg l −1. In some instances, it has been reported that a dissolved oxygen concentration in excess of 4.0 mg l −1 is required to achieve maximum nitrification rates, while ...

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What is biological oxygen demand (BOD)? Biological oxygen demand (BOD), also known as biochemical oxygen demand, is a bioassay procedure that measures the dissolved oxygen (DO) consumed by bacteria from the decomposition of organic matter. The BOD analysis is an attempt to simulate by a laboratory test the effect that organic material in a ...

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ratio. In this study, the effect of dissolved oxygen (DO) and influent ratio of chemical oxygen demand to nitro-gen (COD/N) ratio on biological nitrogen removal from synthetic wastewater was investigated. Experiments were conducted in moving bed biofilm reactors (MBBRs) on partial nitrification process in pilot-plant configuration for 300 days.

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The effects of H 2 O 2 on plant physiological characters and growth of Ficus deltoidea plants on the 12th week of observation. All the data are a mean of five replicates.

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The Effects of Dissolved Oxygen Concentration and Biological Solids Retention Time on Activated Sludge Treatment ... determine the effects of DO concentration and biological solids retention time (BSRT) on ... BSRTs of 20, 10, 5, and 2 days, were fed settled municipal wastewater collected from the Kuwahee wastewater treatment plant in Knoxville ...

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Biological Oxygen Demand. You don't often think that water bodies contain oxygen, but water does contain a small amount of dissolved oxygen. A small amount, but it is essential for life in the water. Biological oxygen demand (BOD) generally represents how much oxygen is needed to break down organic matter in water.

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The chloride concentration of synthetic wastewater was varied from 150 to 5,000 mg/L and the treatment. results are summarized in Figure 4. The removal efficiency for SCOD was gradually decreased ...

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In this study, the effect of high concentrated dissolved oxygen (20-30mg/l) on the lettuce plant growth in a deep hydroponic culture under a low greenhouse temperature is investigated using an oxygen enricher (Ehime Sanso, OD110) and a pure high …

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In this study, the effect of high concentrated dissolved oxygen on the lettuce plant growth in a deep hydroponic culture under a low greenhouse temperature has been investigated.

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Download Free PDF. Download Free PDF. ... A short summary of this paper. 37 Full PDFs related to this paper. Read Paper. Effects of high sodium chloride concentrations on activated sludge treatment. Download. Related Papers. ... Biological denitrification of fertiliser wastewater at high chloride concentration. By Mogens Henze.

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The effect of high O 2 concentration on photosynthetic 14 CO 12 assimilation and its 14 C-products in leaves of low temperature pretreated (cold-acclimated) rape plants was studied. The inhibition of photosynthesis (Warburg effect) and modification in photosynthetic carbon metabolism caused by O 2 were found to be less pronounced in the low temperature pretreated than in the control plants.

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Jay, V.; Genestier, S. and Courduroux, J.C. (1992) Bioreactor studies on the effect of dissolved oxygen concentrations on growth differentiation of carrot (Daucus carota L.) cell cultures. Plant Cell Rep. 11: 605-608.

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plant. Biological treatment using aerobic activated sludge process has ... with sufficient dissolved oxygen (DO) concentration (typically 2 mg/l) to effect biodegradation of soluble organic impurities ... and high return activated sludge pumping capacity. Water Today l August - 2011 33. The Cyclic Activated Sludge System ...

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