New Approach to Modelling Sand Filter Clogging by Septic Tank Effluent

Nieć, Jakub; Spychała, Marcin; Zawadzki, Paweł

doi:10.12911/22998993/62296

Cited by 7 publications

(4 citation statements)

References 46 publications

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“…The simulation results are visualized in Figure 2. The substrate concentration depletes quite rapidly in the inflow region of the reactor, which is consistent with the Iwasaki model for sand filters described in [25]. In the downstream region, the concentration levels off.…”

Section: Simulation Without Suspended Bacteriasupporting

confidence: 84%

A simple model of biofilm growth in a porous medium that accounts for detachment and attachment of suspended biomass and their contribution to substrate degradation

Gaebler

Eberl

2018

Eur. J. Appl. Math

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We derive a macroscopic model for biofilm formation in a porous medium reactor to investigate the role of suspended bacteria on reactor performance. The starting point is the mesoscopic one-dimensional Wanner–Gujer biofilm model. The following processes are included: hydrodynamics and transport of substrate in the reactor, biofilm and suspended bacteria growth in the pore space, attachment of suspended cells to the biofilm, and detachment of biofilm cells. The mesoscopic equations are up-scaled from the biofilm scale to the reactor scale, yielding a stiff system of balance laws, which we study numerically. We find that suspended bacteria and attachment can have a significant effect on biofilm reactor performance.

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Section: Simulation Without Suspended Bacteriasupporting

confidence: 84%

A simple model of biofilm growth in a porous medium that accounts for detachment and attachment of suspended biomass and their contribution to substrate degradation

Gaebler

Eberl

2018

Eur. J. Appl. Math

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“…The mean value of λ 0 was 2.6 m −1 . The simulation performed on the basis of the obtained initial filter coefficient (Equations 1-3, [41]) did not give values comparable to measured values for a specific deposit. Additional measurements were taken considering the difference of the initial filter coefficient at depth.…”

Section: Determination Of Specific Deposit (Vs) Distribution In Vertical Profile Of Sand Filtermentioning

confidence: 73%

“…The simulation, performed on the basis of the λ filter coefficient (Equations 1-3, [41]) using the Iwasaki formulae [1], was conducted for an estimated specific deposit.…”

Section: Determination Of Specific Deposit (Vs) Distribution In Vertical Profile Of Sand Filtermentioning

confidence: 99%

Removal of Volatile Solids from Greywater Using Sand Filters

et al. 2019

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Sand filtration is a primary stage of treatment for reuse of greywater. This study aimed at assessing the volatile solid removal efficiency of a sand filter and imitating its performance using analytical simulation. This study used artificial greywater, medium sand as a filtering material, and nine PVC cylinders as filter columns. Samples of the sand were collected after 6, 14 and 21 days, with the aim of specific deposit determination. The vertical distribution of specific deposit (volatile solids) in the sand filters was typical for gravitationally operated sand filters. Relatively high removal efficiency of volatile solids (51–60%) was achieved at relatively low cumulative hydraulic load. The average removal efficiency of organic compounds (detected as chemical oxygen demand) was 26.8%. Maximum specific deposit was achieved for a cumulative hydraulic load of 363.6 m. The filter coefficient was identified empirically for application of the Iwasaki formula. The filter coefficient λ was corrected for a better fit of the modelled values with measured values.

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“…Mathematical modelling of wastewater treatment processes has become increasingly popular in recent years [11][12][13][14]. Usually wastewater filters are complex systems, mathematical modelling of which is most often carried out using the difference differential models, which require complicated mathematical tools and expensive simulations.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Filtration Capacity of Surface Wastewater Filters by Mathematical Modelling

Marčiulaitienė

Meškauskaitė

Pozniak

et al. 2020

Ecological Chemistry and Engineering S

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As the urbanisation level increases, due to intensification of car traffic and increased areas of impermeable surfaces, pollution of surface wastewater and a negative impact on water bodies are increasing. Due to the increasing pollution of surface water bodies, the eutrophication process is taking place intensively. One of the technologies of surface wastewater treatment allowing reduction in the amounts of suspended solids (SS), heavy metals and other pollutants is surface wastewater filters. Filters with different fillers have been designed for the treatment of principal surface wastewater pollutants: suspended solids, heavy metals (zinc, cadmium, copper, lead), BOD5, total carbon and nitrogen. The Kriging method was adapted to test the efficiency of filters filled with construction waste and wood waste-derived biochar using distance matrices. The method developed makes it possible to model the characteristics of filters in relation to different fillers, using experimental results. The mathematical model is suitable for other filtrate characteristics, not only the ratio of fillers, but also the length of the filter life, its durability calculations, which allows optimizing filter cleaning efficiency up to 96.93 %.

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New Approach to Modelling Sand Filter Clogging by Septic Tank Effluent

Cited by 7 publications

References 46 publications

A simple model of biofilm growth in a porous medium that accounts for detachment and attachment of suspended biomass and their contribution to substrate degradation

A simple model of biofilm growth in a porous medium that accounts for detachment and attachment of suspended biomass and their contribution to substrate degradation

Removal of Volatile Solids from Greywater Using Sand Filters

Investigation of Filtration Capacity of Surface Wastewater Filters by Mathematical Modelling

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