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Showing 1 to 20 of 281 for “"retention time"”.
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Numerical extrapolations for retention time prediction in capillary gas chromatography
If the gas chromatographic retention behavior of a compound is known under isothermal conditions at several temperatures, then it is possible to predict accurately the retention time under temperature programmed conditions. This work details the calculations required to perform such predictions. A …
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Retention time and solvent concentration prediction for an automated peptide manufacturing platform
… for the regression-based prediction of peptide retention time and solvent concentration using amino acid physio-chemical properties and historical test data from liquid chromatography and mass spectroscopy (LC-MS) testing. This research was performed alongside the team at Mytide Therapeutics, in …
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Effect of Solids Retention Time on Activated Sludge Properties and Effluent Quality
The effect of solids retention time (SRT) or sludge age on activated sludge properties and effluent quality was investigated using laboratory scale reactors. It was found that an increase in SRT resulted in an increase in effluent solution polysaccharide, with the < 3,000 daltons (3K) size fraction …
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Effect of solids retention time in membrane bioreactors on reverse osmosis membrane fouling
… municipal wastewater treatment plant. The solids retention time (SRT) in the MBRs was adjusted to 2, 10, and 20 days for the three experiments conducted and various parameters were measured. These parameters included inorganics and organics in the water and on the RO membranes, as well as the …
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Changes in Water Quality as Related to Retention Time Within Red Rock Reservoir, Iowa, Summer 1972
… from becoming stable by high inflow. The average retention time was 11.7 days. The reservoir water was completely replenished five times during the study. No correlation was found between retention time and pH, specific conductance, dissolved carbon dioxide, dissolved oxygen and alkalinity. …
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Impact of Biochar Amendment, Hydraulic Retention Time, and Influent Concentration on N and P Removal in Horizontal Flow-Through Bioreactors
… 0.6 mg L-1 PO43--P was delivered at hydraulic retention times (HRTs) of 3, 6, and 12 h. Mean NO3--N removal efficiencies ranged from 16.9%-93.7%, and media type was insignificant at low influent NO3--N concentrations, but B30 was the most effective at high influent NO3--N concentrations. Mean …
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The effect of ammonial loading, solids retention time and operating temperature on the biological nitrification and denitrification of high ammonia landfill leachate
The effect of ammonia loading, solids retention time and operating temperature (20, 17, 14, 12 and 10 °C) on the treatment of high ammonia landfill leachate (200, 300, 600, 1000, 1500 and 2000 mg NH4-N/L), was investigated. Two biological, single-sludge, nitrification-predenitrification systems …
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Effect of Feed Rate and Solid Retention Time (SRT) on Effluent Quality and Sludge Characteristics in Activated Sludge Systems Using Sequencing Batch Reactors
… two key parameters are the Solid Retention Time (SRT) and the substrate loading rate. The latter is related to the two basic designs in activated sludge bioreactor configurations: the Plug Flow Reactor (PFR) and the Completely Stirred Tank Reactor (CSTR). PFR systems have a high …
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The relationship between the boron concentration of East Lansing municipal wastewater and retention time through the Michigan State University water quality management project under continuous flow conditions
Thesis (M.S.)--Michigan State University. Dept. of Fisheries and Wildlife, 1976
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Investigating the effects of three needling parameters (manipulation, retention time, insertion site) on needling sensation and pain profiles and regional pressure pain threshold : a study of eight deep needling interventions
… investigating three needling parameters (needle retention time, needle manipulation and site of needle insertion) on the strength and quality of needling sensation (deqi) and on the strength of needling pain. Aims: To investigate the effect of three needling parameters (needle manipulation, …
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Effects of hydraulic loading and laundry detergent on the operation of aerobic package treatment systems
… of aerobic package treatment systems: hydraulic retention time, laundry detergents, and hydraulic surges. To determine the effect of hydraulic retention time on system performance, six bench scale activated sludge systems were constructed. Wastewater from an actual residence was collected twice …
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Dynamic property evaluation of frother
… of solvent. IDFI is derived from initial retention time of froth instead of retention time. IDFI is defined as the limiting slope of the initial retention time versus concentration curves while the concentration approaches zero. IDFI value depends on chemical structure and molecular weight …
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Using Tall Fescue to Remove Nutrients from Renovated Turkey Processing Wastewater
… grass cells with different hydraulic retention time were studied. The results show that there is no significant difference in treatment between 3, 4 and 5-days hydraulic retention time. With 1-day of retention time nutrient removal fluctuated. Two days of retention achieved 60% NO3--N …
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Enhanced Biological Phosphorus Removal for Liquid Dairy Manure
… (ii) effects of dissolved oxygen and solids retention time on the efficiency of EBPR, and (iii) effectiveness of gravity thickening for reducing the volume of harvested EBPR aerated mixed liquor. Two pilot-scale EBPR systems were used in this study. The ratio of the manure chemical oxygen …
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Experimental Studies in Temperature Programmed Gas Chromatography
… fundamental chromatographic values, such as retention time, retention temperature and resolution. Comparison of these effects was made by studying column length and linear velocity in conjunction with temperature programming rates. Experimental determinations using a combination of three …
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Hydrothermal liquefaction of low-lipid microalgae to produce bio-crude oil
… parameters, including reaction temperature, retention time and initial pressure on HTL product yields and bio-crude oil quality were investigated. Bio-crude oil yield increased with temperature: it increased from 0.4% to 39.8% as temperature increased from 100°C to 320°C for Chlorella, and …
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Variables Affecting Gas Production in Mesophilic Anaerobic Digestion
… The relationship postulated between gas yield, retention time and feed solids concentration is expressed as the LYES diagram. To obtain the maximum gas yield a digester needs to be operated with the highest solids feed but with the longest retention time possible to maintain a low loading rate. …
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Kinetics of enhanced phosphorus removal in the activated sludge process
… reactor are present in the system, the actual retention time of the primary anoxic reactor will have the dominant effect on the degree of phosphorus removal. (3) In a system where only a primary anoxic reactor is present, there is an optimum actual anoxic retention time for obtaining maximum …
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