Hydraulic effects of recharging the Magothy Aquifer, Bay Park, New York, with tertiary-treated sewage

Vecchioli, John; Ku, Hou; Sulam, Dennis J.

doi:10.3133/pp751f

Cited by 10 publications

(3 citation statements)

References 6 publications

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“…The chlorine concentration for the low pH SPIE was chosen much lower than the one for neutral pH SPIE: being fed for less time before disinfection, its chlorine demand was likely lower. While relatively high, these chlorine concentrations are significantly lower than concentrations used by Ehrlich et al (20) and Vecchioli et al (21) for groundwater recharge studies.…”

Section: Methodsmentioning

confidence: 91%

“…Several investigators have addressed the effects of disinfection on biological clogging in aquifers. With studies on groundwater recharge, Ehrlich et al (20) and Vecchioli et al (21) showed that maintaining a residual chlorine concentration greater than 2-2.5 mg/L reduced clogging in general and in some instances prevented clogging by microorganisms. McCarty et al (3) used hydrogen peroxide to control biological clogging near the injection well during in-situ bioremediation.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Colony Morphologies and Disinfection on Biological Clogging in Porous Media

Dupin

McCarty

2000

Environ. Sci. Technol.

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Biological clogging of aquifers and other porous media during bioremediation, sand filtration, and aquifer recharge is a significant problem that is yet poorly understood and controlled. One major difficulty is the relatively few direct observations of clogging phenomena, which are required to adequately validate numerical models for predicting flow through porous media. Visualization of biological growth with time and accompanying reductions in hydraulic conductivity were obtained using twodimensional micromodels of porous media. The micromodels were seeded with mixed microbial cultures to allow natural selection of dominant aerobic morphologies following continuous feed of culture media containing 1.36-1.69 mM acetate flowing at 0.9-3.6 m/day specific discharge velocity. Of the several different resulting colony morphologies, filaments dominated at pH 3, while biofilms and aggregates dominated at neutral pH. Conductivity decrease correlated with biological growth and morphology, and sudden conductivity recoveries correlated with sloughing events. Periodic chlorine disinfection resulted in temporary increase in conductivity and helped open channels of flow between dense colonies. However, aggregates of organisms exhibited increased resistance to chlorine disinfection with time, reducing disinfection effectiveness. Continuous, rather than periodic, disinfection is recommended. Models for biological substrate removal and clogging should incorporate different growth morphologies to produce satisfactory simulation results.

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Section: Methodsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Impact of Colony Morphologies and Disinfection on Biological Clogging in Porous Media

Dupin

McCarty

2000

Environ. Sci. Technol.

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“…The factors contributing to biological clogging of filtration beds, recharge basins, and aquifers during in-situ bioremediation are yet poorly understood. Investigators have studied biological clogging effects from change in flow rate under constant head conditions ( − ) and biomass build-up ( − ). Clogging is reported to result from liquid porosity reduction due to biofilm growth ( , ), from the formation of biomass aggregates plugging pore necks ( , ), from the production of extra-cellular polymers that fill the pores (), from the formation of gas bubbles that prevent liquid flow (), and from an increase in pore channel friction factor ().…”

Section: Introductionmentioning

confidence: 99%

Mesoscale and Microscale Observations of Biological Growth in a Silicon Pore Imaging Element

Dupin

McCarty

1999

Environ. Sci. Technol.

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Better physical understanding is needed of the processes affecting biological growth in aquifers, filtration beds, and recharge basins. Toward this end, a two-dimensional random width network pore model etched in a silicon wafer was developed to simulate microbial growth in porous media representative of fine sand. This Silicon Pore Imaging Element (SPIE) was seeded with a mixed culture and fed with 0.34 mM acetate under aerobic conditions and at fixed flow rate. Twelve filamentous colonies grew in a dense manner in the upgradient and lateral directions and at low density in the downgradient direction. Heterogeneous colonization led to empty zones. Particle tracking suggested rerouting of flow due to biomass growth. Microscale time-lapse measured filamentous growth rates (0.5 to 1.6 µm/min) were in good agreement with measured mesoscale colony expansion rates. Rather than the microscale concept of biomass developing at the surface of soil grains, filamentous growth may be better represented as mesoscale colonies spanning over several pores and separated from each other by open flow channels. Biological clogging might be prevented if such flow channels could be kept open in some manner.

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Clogging

Maliva¹

2019

Springer Hydrogeology

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Hydraulic effects of recharging the Magothy Aquifer, Bay Park, New York, with tertiary-treated sewage

Abstract: From 1968 to 1973, water from public supply and water reclaimed from sewage were used in a series of 19 artificialrecharge experiments at Bay Park, N.Y. Recharge to the Magothy aquife-r was through a fiberglass-cased well with a 16-inch-diameter stainless-~steel screen set from 418 to 480

Cited by 10 publications

References 6 publications

Impact of Colony Morphologies and Disinfection on Biological Clogging in Porous Media

Impact of Colony Morphologies and Disinfection on Biological Clogging in Porous Media

Mesoscale and Microscale Observations of Biological Growth in a Silicon Pore Imaging Element

Clogging

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