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The effects of temporal and spatial changes in biological activity and biomass amount on biofilter performance were investigated in a labscale tricklebed air biofilter at a toluene loading of 469gm3h1 under two different experimental strategies namely periodic backwashing at a rate of 1h once a week and 2d starvation

These results indicated that the microorganisms in the fillers formed a unique structure in the evolution of microbial community and the rapid readaptation of the biofilter could contribute to the activity retention of its biomass during the starvation period

Finally during 8–24 h after the backwashing the microbial activity and biomass will keep stable and the performance of the biofilter will go steadily which would cause the ratios of CC 0 DON unchanged

Microbiological activity was defined herein as NOMassociated intercellular dehydrogenase activity and viable biomass was defined as the amount of active cells present in a biofilter A third parameter specific activity was defined as the INT reduction activity normalized by the biomass and accounted for the relative activity of a given biofilter population

Ali Aygun in Egg Innovations and Strategies for Improvements 2017 Factors affecting microbial activity Eggshell microbial activity may be influenced by many factors including housing systems strains or genotypes of birds hen age seasons of the year and temperature conditions during egg storage Housing systems Aerobic bacteria were more prevalent on the shells of eggs collected from

Microbial biomass may reduce losses of N and other nutrients during periods of low crop demand and may act as a source of nutrients during active crop growth from Authors View Show abstract

Aug 31 2010 · The aim of this study is to investigate the existence of inert biomass and its effect on biomass accumulation patterns and structure change in filter beds Four biofilters were operated for more than 100 days and the total biomass during the period of operation was monitored Two microbial growth models

The operational parameters of the partialnitritation biofilter effluent ammonium nitrite and nitrate concentrations total nitrogen removal biomass concentration removal efficiencies of antibiotics AZT NOR TMP and SMZ were linked to the bacterial community structure of the partialnitritation biofilter and the activity of its microbial

These results indicated that the microorganisms in the fillers formed a unique structure in the evolution of microbial community and the rapid readaptation of the biofilter could contribute to the activity retention of its biomass during the starvation period Download Download highres image 116KB Download Download fullsize image Fig 7

The presence of sufficient biomass and microbial activity favorably influenced biofilter reacclimation after restartup following starvation Do you want to read the rest of this article Request

Aug 31 2010 · Four biofilters were operated for more than 100 days and the total biomass during the period of operation was monitored Two microbial growth models one with an inert biomass assumption and the other without were established and compared The change in the filter bed structure due to biomass accumulation was analyzed based on simulation results

Magnetite Fe3O4 is an environmentally ubiquitous mixedvalent iron Fe mineral which can form via biotic or abiotic transformation of FeIII oxyhydroxides such as ferrihydrite Fh It is currently unclear whether environmentally relevant biogenic Fh from FeIIoxidizing bacteria containing cellderived organic matter can transform to magnetite We compared abiotic and biotic

This apart the microbial activities in the biofilters were measured in terms of concentration of active biomass adenosine triphosphate ATP and total cell count

The improved biofilter resulted in an environment including matrix DO and pH suitable for microbial growth Along the depth of the biofilter column the environment affected the microbial biomass and microbial activity and thus affected the DON concentration PMID 27259961 Indexed for MEDLINE MeSH terms Charcoal Drinking Wateranalysis

The biomass on a biofilter shows an abundance of ciliated protozoans during the cold period and where it is being replaced by bacteria and fungi during the warmer period Le Bihan and Lessard

Comparative measurements of microbial activity in drinking water biofilters Preozonation has been shown to increase biomass activity at the top of the biofilter especially during periods

Biofilter is one of the most important separation processes that can be employed to remove organic pollutants from air water and wastewater Even though it has been used over a century it is still difficult to explain theoretically all the biological processes occurring in a biofilter In this paper the fundamental of biological processes involved in the biofilter is critically reviewed

The effects of soil type and organic material quality on the microbial biomass and functional diversity of cropland soils were studied in a transplant experiment in the same climate during a 1year field experiment Six organic materials WS wheat straw CS corn straw WR wheat root CR corn root PM pig manure CM cattle manure and three contrasting soils Ferralic Cambisol Calcaric

treating toluene Filter pressure drop removed dry biomass biofilter performance and microbial metabolic characteristics were analyzed to evaluate the effectiveness of the methods Results showed that air sparging was inefficient for biomass removal 1 kg dry biomassm3 filter whereas

Apr 17 2014 · Biological factors that influence the oxidative capacity of the biofilter include biomass quantity and the biocatalytic activity of the biomass Increasing biomass quantity as indicated by the carbon accumulation rate in Table III will only be beneficial until all coal surface area is covered with microbial community up to a thickness that

The operational parameters of the partialnitritation biofilter effluent ammonium nitrite and nitrate concentrations total nitrogen removal biomass concentration removal efficiencies of antibiotics AZT NOR TMP and SMZ were linked to the bacterial community structure of the partialnitritation biofilter and the activity of its microbial

In particular temperature controls biogrowth kinetic Biological activity is high during the summer when temperature is above 20 °C and decreases during the cooler months with relatively insignificant activity during the winter 10 °C and below Filter loading rates are similar to those used in rapid sand filtration

76 R Bras Ci Solo 377685 Daniel Bini et al MICROBIAL BIOMASS AND ACTIVITY IN LITTER DURING THE INITIAL DEVELOPMENT OF PURE AND MIXED PLANTATIONS OF Eucalyptus grandis AND Acacia mangium1 Daniel Bini 2 Aline Fernandes Figueiredo 3 Mylenne Cacciolari Pinheiro da Silva 4 Rafael Leandro de Figueiredo Vasconcellos 5 Elke Jurandy Bran Nogueira Cardoso 6

Abstract Existence of inert biomass and its impact on biomass accumulation patterns and biofilter performance were investigated Four biofilters were set up in parallel to treat gaseous toluene Each biofilter operated under different inlet toluene loadings for 100 days Two microbial growth models one with an inert biomass assumption and the other without were established and compared

CiteSeerX Document Details Isaac Councill Lee Giles Pradeep Teregowda Abstract Biomass and microbial activity in backwashing processes of a biofilter for tertiary treatment were investigated The microbial groups revealed new distribution along the biofilter depth after low flow rate backwashing for a short time Then the startup process was accelerated by backwashing

Sep 27 2005 · Within the nine sites three soils S3 S4 and S5 were the most saline The average microbial biomass C MBC average basal soil respiration BSR and average fluorescein diacetate hydrolyzing activity FDHA were lowest during the summer season indicating a

At the initiation of snowmelt microbial biomass N pools increasedfrom 30 to 59 g n m2concurrent with a decrease in soil inorganic N pools During the latterstages of snowmelt microbial biomass N pools decreased sharply without aconcurrent increase in inorganic N pools or significant leaching losses

Little is known about how plant leaf litter decomposing on the soil surface is affecting microbial communities in the underlying soil Here we examined the effects of decomposing leaf litter of different initial chemistry on biomass stoichiometry community structure and activity of microorganisms in the soil underneath the decaying litter layer

The effects of inlet VOCs Volatile Organic Compounds shifts on microbial community structure in a biofiltration system were investigated A labscale biofilter was set up to treat eight VOCs sequentially Short declines in removal efficiency appeared after VOCs shifts and then later recovered The number of OTUs in the biofilter declined from 690 to 312 over time At the phylum level

For objective 2 fungal plus microbial biomass samples will be collected from the two biofilters eight times between April and November each year to represent biofilter activity over time A wood baiting approach will be used to retrieve blocks efficiently from biofilter media

Ali Aygun in Egg Innovations and Strategies for Improvements 2017 Factors affecting microbial activity Eggshell microbial activity may be influenced by many factors including housing systems strains or genotypes of birds hen age seasons of the year and temperature conditions during egg storage Housing systems Aerobic bacteria were more prevalent on the shells of eggs collected from

Biofilter is one of the most important separation processes that can be employed to remove organic pollutants from air water and wastewater Even though it has been used over a century it is still difficult to explain theoretically all the biological processes occurring in a biofilter In this paper the fundamental of biological processes involved in the biofilter is critically reviewed

Dec 22 2014 · Irrespective of the biofilter configuration or process followed the filter’s biomass resides primarily in biofilms a complex microbiological community in which microorganisms are encased and immobilized in a selfsecreted matrix of hydrated extracellular polymeric substances EPS

After 6 months of operation a longterm biofilter was stopped for two weeks and then it was started up again for a second experimental period of almost 13 years with high toluene loads and submitted to several physical and chemical treatments in order to remove excess biomass that could affect the reactor’s performance due to clogging whose main effect is a high pressure drop Elimination

Sep 17 2018 · Two mechanisms microbial acclimation and substrate depletion have been proposed to explain temporary warming effects on soil microbial activity

maintaining or increasing microbial activity Biofilter nutrient enhancement was found to decrease terminal head loss by 15 relative to a control biofilter with no nutrient enhancement Nutrient enhancement also sustainably decreased the breakthrough of 2methylisoborneol MIB manganese Mn and dissolved organic carbon DOC