Diffusion–advection process modeling of organochlorine pesticides in rivers

Cárdenas, Samuel; Márquez‐Romance, Adriana Mercedes; Pérez, Enrique J. Martínez

doi:10.1080/23249676.2021.1982029

Cited by 11 publications

(27 citation statements)

References 27 publications

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“…In addition, Cárdenas et al. (2021b) has estimated OCPs maximum utilization coefficients

( {{k_m}} )

for a coupled model including advection‐diffusion, transformation and sorption‐desorption processes by the biofilm in the river bottom for eight OCPs dissolved in water obtaining the mean values in the order between 10 0 –10 1 μg OCPs/μg VSS.day, being close to those found by Freytez et al. (2019c), Freytez and Márquez (2021), and Maldonado‐Maldonado et al.…”

Section: Methodsmentioning

confidence: 99%

“…It is assumed that the molecular diffusion is isotropic in the unsaturated zone. The analytical solution for the molecular diffusion model derived from a mass balance and the combination of the Fick´s Law is expressed as Equation (10) (Cárdenas et al., 2021b; Márquez et al., 2020, 2021b).

\begin{equation}{\left( {{S_{VOC}}} \right)_e} \left( {z,t} \right) = \frac{{{{\left( {{S_{VOC}}} \right)}_i}}}{{\sqrt {4\pi Dt} }} \exp^{( {\frac{{ - {z^2}}}{{4Dt}}} )} \end{equation}

where

{( {{S_{VOC}}} )_e}( {z,t} )

is the downstream VOC vapor‐phase concentration

z

, from the fuel leak location into the underground tanks, for a time,

t

.…”

Section: Methodsmentioning

confidence: 99%

“…Air sparging implied to design an air injection system for bioremediation of hydrocarbons dissolved in water within the saturated zone, whose presence could be justified by a vertical transport from unsaturated zone and sorption-desorption process from the water-soil interface (Cárdenas et al, 2021a(Cárdenas et al, , 2021b, where the theoretical need for oxygen was obtained from the Biochemical Oxygen Demand (BOD) of the hydrocarbons and the amount of indigenous organisms produced daily within the in situ treatment system (Metcalf & Eddy, Inc. (1991)).…”

Section: Design Of Air Sparging Systemmentioning

confidence: 99%

“…Design of SVE system involved to estimate the flow of VOCs of hydrocarbons within the stratum in the vadose zone where the fuel leak from underground tanks took place, and a mass transfer process due to volatilization was carried out in the gas-liquid interface, comprising the soil gas, being modeled simulating the occurrence of the molecular diffusion process (Cárdenas et al, 2021b). In this process, the VOCs's mass flows from an area of greater to another of lesser concentration, due to a random movement of molecules (Guevara, 2016;Márquez et al, , 2020Márquez et al, , 2021b.…”

Section: Design Of Sve Systemmentioning

confidence: 99%

“…It is assumed that the molecular diffusion is isotropic in the unsaturated zone. The analytical solution for the molecular diffusion model derived from a mass balance and the combination of the Fickt's Law is expressed as Equation ( 10) (Cárdenas et al, 2021b;Márquez et al, 2020Márquez et al, , 2021b.…”

Section: Design Of Sve Systemmentioning

confidence: 99%

See 4 more Smart Citations

An approach to remediation of a tropical aquifer contaminated with hydrocarbons

Márquez‐Romance

Freytez-Boggio

Cárdenas-Izaguirre

et al. 2021

Environmental Quality Mgmt

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This paper deals about an approach to remediation for treating soils and groundwater contaminated with hydrocarbons in a tropical aquifer caused because of leaks from underground tanks in a gas station of Venezuela. Ex situ and in situ remediation treatment options were designed, recommending the ex situ remediation due to microbial inhibition produced by the presence of heavy metals and multiple strata with different soil materials in the interface between the unsaturated and saturated zones, where the most significant hydrocarbon concentrations were found. Under these conditions, ex situ bioremediation option based on two coupled bioreactors can overcome environmental limiting factors by optimizing temperature, oxygen supply, nutrient status, contaminant bioavailability, and microbial population. Ex situ remediation included for soil treatment, a Soil‐Slurry Sequencing Batch Reactor (SS‐SBR) and Upflow Anaerobic Filter separated in three phases (UAF‐3SS). For groundwater treatment SBR‐UAF‐3SS sequence was established. The first phase was represented by SS‐SBR for ex situ bioremediation of soils, configuring COD removal efficiency of 80%. It was set that SS‐SBR performs functions for groundwater treatment operating as SBR, removing 60% COD. For the second phase, an upflow anaerobic filter separate in three phases (UAF‐3SS) designed to ensure 99% COD removal efficiency.

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“…In addition, Cárdenas et al. (2021b) has estimated OCPs maximum utilization coefficients

( {{k_m}} )

Section: Methodsmentioning

confidence: 99%

\begin{equation}{\left( {{S_{VOC}}} \right)_e} \left( {z,t} \right) = \frac{{{{\left( {{S_{VOC}}} \right)}_i}}}{{\sqrt {4\pi Dt} }} \exp^{( {\frac{{ - {z^2}}}{{4Dt}}} )} \end{equation}

where

{( {{S_{VOC}}} )_e}( {z,t} )

is the downstream VOC vapor‐phase concentration

z

, from the fuel leak location into the underground tanks, for a time,

t

.…”

Section: Methodsmentioning

confidence: 99%

Section: Design Of Air Sparging Systemmentioning

confidence: 99%

Section: Design Of Sve Systemmentioning

confidence: 99%

“…It is assumed that the molecular diffusion is isotropic in the unsaturated zone. The analytical solution for the molecular diffusion model derived from a mass balance and the combination of the Fickt's Law is expressed as Equation ( 10) (Cárdenas et al, 2021b;Márquez et al, 2020Márquez et al, , 2021b.…”

Section: Design Of Sve Systemmentioning

confidence: 99%

See 3 more Smart Citations

An approach to remediation of a tropical aquifer contaminated with hydrocarbons

Márquez‐Romance

Freytez-Boggio

Cárdenas-Izaguirre

et al. 2021

Environmental Quality Mgmt

Self Cite

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Calibration of diffusion‐advection process models for organochlorine pesticides in a tropical river

Márquez‐Romance

Cárdenas-Izaguirre

Pérez

et al. 2021

Environmental Quality Management

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This paper deals with the calibration of diffusion-advection process models for organochlorine pesticides (OCPs) in a river of tropical country called Tucutunemo River, Venezuela. The novelties consist of the following aspects: 1) modeling of pesticides of type organochlorine including DDT and DRIN and their isomers such as: p.p'-DDT, o.p'-DDT, p.p'-DDD, p.p'-DDE, o.p'-DDE, Aldrin, Dieldrin, and Endrin. 2) Determination of parameters and statistical adjustment of diffusion and biochemical transformation coefficients in mathematical expressions derived from Fick's law, and modified equations from the biofilter reactors to simulate the attached biofilm on support medium to the attached biofilm on sediments in the river bed. Four scenarios are proposed for modeling: 1) molecular diffusion without biochemical transformation, 2) molecular diffusion with biochemical transformation, 3) advective diffusion without biochemical transformation, 4) advective diffusion with biochemical transformation.The combination of advective diffusion with biochemical transformation results in the best fit to explain the removal of the OCPs along the river.

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An approach for restoration of the water quality with emphasis on the removal of organochlorine pesticides and eutrophic conditions in tropical rivers

Márquez‐Romance,

Freytez‐Boggio,

Maldonado‐Maldonado

et al. 2023

Environmental Quality Mgmt

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This work deals with an approach for the water quality restoration with emphasis on the removal of organochlorine pesticides and eutrophic conditions in tropical rivers, causing influence on the management of the central‐regional aqueduct, as a source of water supply for human consumption (4 million people) and industrial production in the states of Carabobo, Cojedes and Aragua, Venezuela, testing the phytoremediation techniques through Vetiveria zizanioides (VZ) species and coupled bioreactors, Sequencing Batch Reactor (SBR) followed by an Upflow Anaerobic Filter in Three Separate Stages (UAF‐3SS). Five rivers are involved known as Chirgua, Paito Guacara, Ereigüe, and Tucutunemo, whose waters have been classified as hypereutrophic, and containing organochlorine pesticides (OCPs). As a sample, for Tucutunemo River, OCPs included to DDT (dichlorodiphenyltrichloroethane) and its isomers and DRINs (Aldrin, Endrin and Dieldrin) dissolved in water and sorbed on sediments, which were measured during the dry and rainy seasons in the period 2013 to 2016, in three monitoring stations distributed in a reach of 15 km. The results indicated that p.p′‐DDT concentration dissolved in water was increased up to 10 times from rainy to dry seasons, indicating that a permanent use of it is being carried out by farmers in the agricultural activity development. Steady concentrations of the DTT isomers (e.g., p.p′‐DDD and p.p′‐DDE) and Aldrin isomers (e.g., Dieldrin) demonstrated that the anaerobic and aerobic biodegradation processes occurred along the river and between climatic seasons. At experimental scale, VZ hydroponic system developed over a period of 6 months for the removal of nutrients demonstrated moderately low to high removal efficiencies. With respect coupled bioreactors, each bioreactor has been experimentally tested, demonstrating satisfactory performance in Chemical Oxygen Demand (COD) removal from industrial wastewater containing recalcitrant and inhibitory substances (46%–98%), which was estimated in the influent ranging from 3500 to 5500 mg/L, evidencing that coupling of bioreactors might lead to a effluent COD complying with environmental regulations.

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Diffusion–advection process modeling of organochlorine pesticides in rivers

Cited by 11 publications

References 27 publications

An approach to remediation of a tropical aquifer contaminated with hydrocarbons

An approach to remediation of a tropical aquifer contaminated with hydrocarbons

Calibration of diffusion‐advection process models for organochlorine pesticides in a tropical river

An approach for restoration of the water quality with emphasis on the removal of organochlorine pesticides and eutrophic conditions in tropical rivers

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