Variability estimation of urban wastewater biodegradable fractions by respirometry

Lagarde, Fabienne; Tusseau‐Vuillemin, Marie‐Hélène; Lessard, Paul; Héduit, A.; Dutrop, François; Mouchel, Jean-Marie

doi:10.1016/j.watres.2005.08.026

Cited by 44 publications

(37 citation statements)

References 19 publications

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“…The water supplied to a community receives a range of chemical substances and microbial flora during its use such that the wastewater acquires a polluting potential and becomes a health and environmental hazard. Communicable diseases of the intestinal tract such as cholera, typhoid, dysenteries and water borne diseases like infectious hepatitis etc., can be spread from uncontrolled disposal of wastewater, and therefore prevention of communicable diseases and protecting public health attracts the primary objective of sanitary wastewater disposal [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…One of the major sources of organic pollution is effluents from sewage treatment works. Prevention of pollution of natural resources such as land and water by the wastewater and adequate preparation or renovation of the wastewater before reuse, are further important considerations in formulating and designing appropriate wastewater disposal arrangements [3,4].…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Wastewater Treatment Plants in El-Gharbia Governorate, Egypt

Ramadan¹,

Abdel‐Rahman²,

Abdullah³

et al. 2017

Organic Chem Curr Res

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The present study has been undertaken to evaluate performance efficiency of wastewater treatment plants in El-Gharbia governorate in Egypt. The wastewater treatment plants using different biological treatment techniques (conventional activated sludge, oxidation ditch, extended aeration, rotating biological contactors and aerated lagoons processes). Wastewater samples were collected from both influent and effluent of each plant and the wastewater quality were determined at central laboratory of Garbyia Water Co. The performance of each plant was estimated based on the treated wastewater quality data. Correlations between influent and effluent TSS, COD and BOD5 were developed. Kotour WWTP operates with the oxidation ditch technology exhibits the highest performance efficiency, while Tanta WWTP operates with conventional activated sludge technology exhibits the lowest one. The results show that, all collected samples from Tanta, and El Mehala El Kobra WWTPs were exceeding the Egyptian Permissible limits (COD: 80 mg/l) while the samples collected from Mehalet Marhom, Mehalet Menof, Kotour, El Santa, Shernak and Zefta were complying the Egyptian regulations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of Wastewater Treatment Plants in El-Gharbia Governorate, Egypt

Ramadan¹,

Abdel‐Rahman²,

Abdullah³

et al. 2017

Organic Chem Curr Res

View full text Add to dashboard Cite

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“…Respirometric methods have been used to determine parameters of kinetic models that describe the aerobic biodegradation of wastewaters, single compounds, or mixtures of chemicals Orhon et al, 2009). These techniques were also employed to evaluate the biodegradable fraction of wastewaters (Lagarde et al, 2005), and to monitor the acclimation process of an activated sludge to a new environment (Carvalho et al, 2004;Aktas, 2012). Additionally, several on-line respirometer-based biosensors in wastewater treatment plants have been developed.…”

Section: Introductionmentioning

confidence: 99%

Error propagation in open respirometric assays

Lobo¹,

Bértola²,

Contreras

2014

Braz. J. Chem. Eng.

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-This work deals with the calculation of the uncertainty of the exogenous respiration rate (R ex ) and the total oxygen consumed (OC T ) derived from a single open respirometric profile. Uncertainties were evaluated by applying a linear error propagation method. Results show that standard deviations (SD) of R ex and OC T depend not only on the SD of the dissolved oxygen (σ C ) and k L a (σ kLa ), but also on the SD of the derivative term (dC/dt) of the oxygen mass balance equation (σ b ). A Monte Carlo technique was employed to assess σ b ; a power law expression for the dependence of σ b as a function of σ C , the time window (t w ) and the sampling rate (Δt) was proposed. The equations obtained in the present work are useful to calculate suitable conditions (e.g., biomass concentration, k L a) that minimize the coefficient of variation corresponding to R ex and OC T .

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“…Others investigate the relationship between the presence of protozoa in sludge and the structure and morphology of flocs on the course of the wastewater treatment process [9][10][11]. An important and currently commonly discussed tasks in wastewater treatment technology are the ways of description of physiological activity of activated [12,13] and fractioning of the substrate to build and calibrate computer models of sewage treatment systems [14][15][16][17][18]. An important aspect of investigation is also application of raw and treated sewage in agriculture [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Impact of optical indices on particle size distribution of activated sludge measured by laser diffraction method

Sochan

Polakowski

Łagód

2014

Ecological Chemistry and Engineering S

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Abstract:The important factors that strongly influence the particle size distributions measured by the laser diffraction method are the optical parameters of the suspension (refractive index and absorption coefficient). Knowledge of the values of these parameters is necessary for Mie theory. Mie theory is applied for conversion of the intensity of light recorded on detectors into particle size distribution (PSD) of tested material. Both wastewater and activated sludge are mixtures of a variety of elements (mineral or organic, including living organisms). In practice, it is not possible to define clearly the values of the optical parameters, as the composition of the suspension changes over time. The aim of the study was to estimate the impact of assumed values of the optical parameters on particle size distributions obtained. The PSDs of suspensions sampled in different stages of wastewater treatment are the most reproducible when the following optical parameters are defined: absorption coefficients -1.0 and the refractive index -1.52.

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Variability estimation of urban wastewater biodegradable fractions by respirometry

Cited by 44 publications

References 19 publications

Evaluation of Wastewater Treatment Plants in El-Gharbia Governorate, Egypt

Evaluation of Wastewater Treatment Plants in El-Gharbia Governorate, Egypt

Error propagation in open respirometric assays

Impact of optical indices on particle size distribution of activated sludge measured by laser diffraction method

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