respiration inhibition Articles
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Improving the sensitivity of the activated sludge respiration inhibition test and verifying the results using an oxidation-reduction potential electrode
The inhibition of activated sludge respiration is one of the most important parameters for monitoring wastewater toxicity. The main objective of this study was to improve respiration inhibition testing in order to protect the biological degradation within the aerobic process in a wastewater treatment plant more efficiently. In order to influence the sensitivity of the testing bacteria, two ...
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Soil formate regulates the fungal nitrous oxide emission pathway
Fungal activity is a major driver in the global nitrogen cycle, and mounting evidence suggests that fungal denitrification activity contributes significantly to soil emissions of the greenhouse gas nitrous oxide (N2O). The metabolic pathway and oxygen requirement for fungal denitrification are different from those for bacterial denitrification. We hypothesized that the soil N2O emission from ...
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A New Toxkit Microbiotest with the Protozoan Ciliate Tetrahymena
Abstract : Culture free microbiotests with organisms from different trophic and functional levels, e.g. bacteria, algae, rotifers and crustaceans, are presently available. This paper presents the status quo and general design of a new, ready to use multi-generation microbiotest with the standard ciliate Tetrahymena, a representative from a further ecologically relevant group - the protozoa. The ...
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Yorkshire Water acquires Strathtox, Strathkelvin’s latest precision respirometer, to monitor bacterial performance of a new hi-tech pilot plant.
Yorkshire Water has a large Waste Water investment programme to deliver the requirements of the Freshwater Fish Directive over the next five years. In order to achieve the high effluent quality required at various sites, including Esholt (main Bradford site), Knostrop (main Leeds site), Huddersfield and Mitchell Laithes (main Dewsbury site), several large new activated sludge plants will be ...
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The role of respirometry in maximising aerobic treatment plant efficiency
Wastewater treatment plants are coming under increasing pressure to increase their efficiency of operation. There are two objectives in this. The first is to reduce the cost of treatment. The second is a response to new legislation aimed at reducing the carryover of toxic materials to receiving waters. In order to achieve this, it is necessary to focus on the pivotal role of bacterial respiration ...
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Removal of ZnO nanoparticles in simulated wastewater treatment processes and its effects on COD and NH4+-N reduction
For many engineered nanoparticles, the primary pathway of release into the environment is via sewage and industrial wastewater discharges. In this work, the removal of uncoated ZnO nanoparticles (ZnO NPs) during simulated wastewater treatment processes and its impact on treatment performance were examined. Simulated primary clarification removed the majority (about 70%) of the dosed ZnO ...
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Why is Water Temperature Important in Determining Water Quality?
Water temperature as a key factor in the success of aquatic environments and influences several parameters that can alter its physical and chemical properties. The temperature of water defines growing seasons and dictates what species can survive in a particular body of water.Temperature plays an essential role in water chemistry and can affect biological characteristics of surface water, ...
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Effects of heavy metal pollution on the soil microbial activity
The effects of heavy metals on soil microbial processes were investigated over a period of six weeks. Analytical grade (Sigma) sulphate salts of copper, zinc and nickel were added individually and in combinations to soil samples and incubated in different plastic pots. Samples were taken from the pots forthnightly and the rates of microbial carbon and nitrogen mineralization, microbial biomass ...
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The increasing importance of assessing toxicity in determining sludge health and management policy
The harm caused by toxic industrial effluents to sewage treatment works, has been recognised for many years. These can cause reduction in biodegradable efficiency, with an associated requirement for longer treatment time, and in extreme cases, toxic shock can kill off the secondary tanks. Currently, the presence of harmful industrial effluents is made evident by their effects on the overall ...
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