Organic and Nitrogenated Substrates Utilization Rate Model Validating in Sequential Batch Reactor

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This paper deals with the calibration of the model for the utilization rate of organic and nitrogenated substrates (URONS) by the microorganisms in a sequencing batch reactor. The URONS model parameterization was carried out using data obtained from two experimental designs (EDs) applied on tannery wastewater (TW), which included as factors: First ED (aeration sequence and cycle duration) reached a COD removal efficiency (RE) between 29% (cycle duration of 6 h) and 48% (cycle duration of 24 h).Second ED (aeration sequence and filling time) obtained COD-RE (47-51%), NH 4 -N-RE (71-91%), and TKN-RE (50-67%). The URONS model was based on Monod's equation modification. For the first ED, the results of the maximum URONS parameter (r sm ) of 135-946 mg/L⋅h suggest the organic substrate accumulation due to a possible inhibition of the microorganisms by TW substances such as heavy metals and metal halides. For the second ED, the r sm parameter values resulted negative and varying in the order of −10 −2 to −10 −4 mg/L⋅h with respect to (r sm ) for the first ED indicating that a better microorganism performance for URONS occurred in the second ED. For both EDs, the saturation parameter (K s ) values compared to the effluent substrate concentration suggest that the primary substrate for biodegradation was present in the TW.

Section: 21mentioning

confidence: 95%

“…In this study, the SUR by microorganisms is estimated using a modified equation of Monod's equation (Equation 2) that is expressed as follows (Freytez et al, 2019c;Márquez et al, 2020):…”

Section: Theoretical Formulationmentioning

confidence: 99%

Section: 21mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Calibration of model for the utilization rate of organic and nitrogenated substrates by the microorganism in a sequencing batch reactor

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An approach to models for transport and transformation of organochlorine pesticides in rivers

Cárdenas-Izaguirre

Márquez‐Romance

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et al. 2021

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This paper constitutes a novel proposal for predicting the accumulation–utilization rate for transport of the organochlorine pesticides (OCPs) as well as the kinetic coefficients of biodegradation of OCPs dissolved in water and sorbed on sediments in tropical rivers. Eight OCPs were determined in waters and sediments in the dry and rainy seasons from 2013 to 2016. The biochemical transport and transformation model was proposed in two directions, along the river false(∂COCP/∂xfalse)$({\partial {C_{{\rm{OCP}}}}/\partial x} )$, and across the river (direction z$z$), false(∂COCP/∂zfalse)$({\partial {C_{{\rm{OCP}}}}/\partial z} )$, providing kinetic parameters linked to Monod's equation under a steady‐state condition for particulate and soluble OCPs, being useful for designing bioremediation techniques to restore water bodies.

An approach to remediation of a tropical aquifer contaminated with hydrocarbons

Márquez‐Romance

Freytez-Boggio

Cárdenas-Izaguirre

et al. 2021

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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.