scholarly journals Comparison of Four Beddings for Ammonia Control in Individually Ventilated Mouse Cages

2020 ◽  
Author(s):  
Nicholas M Tataryn ◽  
Cindy A Buckmaster ◽  
Rebecca S Schwiebert ◽  
Alton G Swennes
Keyword(s):  
Estrogenic Compounds ◽  
High Ammonia ◽  
Photoionization Detector ◽  
Bedding Materials ◽  
Measurement Period

Ammonia control is an important characteristic of rodent bedding materials. Among natural bedding materials, corncobbedding provides excellent ammonia control but contains estrogenic compounds and is ingested by mice. By comparison,processed cellulose bedding products are biologically inert and harbor fewer bacteria but historically have shown low absorbencyor poor ammonia control. New cellulose products have been developed to address these shortcomings. Over a 2-wk period, we evaluated intracage ammonia levels in mouse IVC using 4 bedding types: shaved aspen, corncob, virgin pelleted cellulose, and refined virgin diced cellulose. Ammonia levels were measured by using 3 methods: colored reagent tubes, colorimetricpaper strips, and a photoionization detector. Corncob, pelleted cellulose, and diced cellulose showed better ammoniacontrol than aspen as early as 4 d after cage changing and throughout the 2-wk measurement period. In addition, pelletedand diced cellulose products resulted in lower ammonia levels than corncob at the end of the 14-d cage-change interval. Ourdata indicate that pelleted or refined diced cellulose are viable alternatives to natural bedding products in IVC to limit therisk of exposure of mice to high ammonia levels.

This Ain't Your Grandma's English

2020 ◽  
Vol 44 (3) ◽  
Author(s):  
Scott Gardner
Keyword(s):  
Anglo Saxon ◽  
New Words ◽  
New Meanings ◽  
Bedding Materials

Words change. We use new words to describe old things, and we put new meanings on old words. Take “beddum and bolstrum” for example. For some of you that phrase might conjure up warm memories of spending the night at grandmother’s house after a day of frolicking with cousins in the meadow, and at bedtime hearing her call from the top of the staircase, “Beddum and bolstrum, kiddies!” . . . or it might not. In fact, beddum ond bolstrum (bedding materials) is made up of old Anglo-Saxon words that haven’t been used much since the late 1000s. Whatever grandma was shouting down the stairs, you must have heard it wrong.

Effect of Aeration on Fresh and Aged Municipal Solid Waste in a Simulated Landfill Bioreactor

2004 ◽  
Vol 39 (3) ◽  
pp. 223-229 ◽  
Author(s):  
Mostafa A. Warith ◽  
Graham J. Takata
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Ammonia Concentration ◽  
Air Injection ◽  
Bioreactor Landfills ◽  
Time To Stabilization ◽  
High Ammonia ◽  
Simulated Landfill ◽  
Term Monitoring

Abstract Municipal solid waste (MSW) is slow to stabilize under conventional anaerobic landfill conditions, demanding long-term monitoring and pollution control. Provision of aerobic conditions offers several advantages including accelerated leachate stabilization, increased landfill airspace recovery and a reduction in greenhouse gas emissions. Air injection was applied over 130 days to bench-scale bioreactors containing fresh and aged MSW representative of newly constructed and pre-existing landfill conditions. In the fresh MSW simulation bioreactors, aeration reduced the average time to stabilization of leachate pH by 46 days, TSS by 42 days, TDS by 84 days, BOD5 by 46 days and COD by 32 days. In addition, final leachate concentrations were consistently lower in aerated test cells. There was no indication of a gradual decrease in the concentration of ammonia, and it is likely this high ammonia concentration would continue to be problematic in bioreactor landfill applications. This study focussed only on biodegradability of organics in the solid waste. The concentrations of the nonreactive or conservative substances such as chloride and/or heavy metals remain in the bioreactor landfills due to the continuous recirculation of leachate. The results of this study demonstrate the potential for air injection to accelerate stabilization of municipal solid waste, with greatest influence on fresh waste with a high biodegradable organic fraction.

scholarly journals Improving the Anaerobic Digestion of Swine Manure through an Optimized Ammonia Treatment: Process Performance, Digestate and Techno-Economic Aspects

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 787
Author(s):  
Anna Lymperatou ◽  
Niels B. Rasmussen ◽  
Hariklia N. Gavala ◽  
Ioannis V. Skiadas
Keyword(s):  
Anaerobic Digestion ◽  
Large Scale ◽  
Treatment Process ◽  
Aqueous Ammonia ◽  
Swine Manure ◽  
Batch Experiments ◽  
Ammonia Treatment ◽  
Aqueous Ammonia Soaking ◽  
High Ammonia ◽  
Reduction Efficiency

Swine manure mono-digestion results in relatively low methane productivity due to the low degradation rate of its solid fraction (manure fibers), and due to the high ammonia and water content. The aqueous ammonia soaking (AAS) pretreatment of manure fibers has been proposed for overcoming these limitations. In this study, continuous anaerobic digestion (AD) of manure mixed with optimally AAS-treated manure fibers was compared to the AD of manure mixed with untreated manure fibers. Due to lab-scale pumping restrictions, the ratio of AAS-optimally treated manure fibers to manure was only 1/3 on a total solids (TS) basis. However, the biogas productivity and methane yield were improved by 17% and 38%, respectively, also confirming the predictions from a simplified 1st order hydrolysis model based on batch experiments. Furthermore, an improved reduction efficiency of major organic components was observed for the digester processing AAS-treated manure fibers compared to the non-treated one (e.g., 42% increased reduction for cellulose fraction). A preliminary techno-economic analysis of the proposed process showed that mixing raw manure with AAS manure fibers in large-scale digesters could result in a 72% increase of revenue compared to the AD of manure mixed with untreated fibers and 135% increase compared to that of solely manure.

High-Sensitivity Micro-Gas Chromatograph–Photoionization Detector for Trace Vapor Detection

ACS Sensors ◽  
2021 ◽  
Author(s):  
Maxwell Wei-Hao Li ◽  
Abhishek Ghosh ◽  
Anandram Venkatasubramanian ◽  
Ruchi Sharma ◽  
Xiaolu Huang ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Gas Chromatograph ◽  
Vapor Detection ◽  
Photoionization Detector

scholarly journals Overcoming ammonia inhibition in anaerobic blackwater treatment with granular activated carbon: the role of electroactive microorganisms

2019 ◽  
Vol 5 (2) ◽  
pp. 383-396 ◽  
Author(s):  
Anna Patrícya Florentino ◽  
Ahmed Sharaf ◽  
Lei Zhang ◽  
Yang Liu
Keyword(s):  
Activated Carbon ◽  
Hydrogen Exchange ◽  
Granular Activated Carbon ◽  
Ammonia Concentration ◽  
Anaerobic Digesters ◽  
Ammonia Inhibition ◽  
High Ammonia

Methanogenesis and enrichment of microorganisms capable of interspecies electron and/or hydrogen exchange was investigated with addition of granular activated carbon (GAC) to batch anaerobic digesters treating vacuum collected blackwater with high ammonia concentration.

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