Benoît Marrot

• PhD HDR
• Professor (Full) at Aix-Marseille University

Membrane bioreactor (MBR) has been proven to be an efficient technology capable of treating various industrial effluents. However, the evaluation of its performances in the case of olive mill wastewater (OMW) over a conventional activated sludge (CAS) have not been determined yet. The present study aims to compare OMW treatment in two laboratory sc...

Soluble microbial products are one of the major fouling agents in membrane bioreactor (MBR). It is accepted that high molecular weights polysaccharides are the main contributors to membrane fouling but the presence in bulk solution of proteins and humic-like substances make fouling layer more complex. To better understand the role of both component...

The Olive Mill Wastewater (OMWW) biodegradation in an external ceramic membrane bioreactor (MBR) was investigated with a starting acclimation step with a Ultrafiltration (UF) membrane (150 kDa) and no sludge discharge in order to develop a specific biomass adapted to OMWW biodegradation. After acclimation step, UF was replaced by an Microfiltration...

The performance of a biomass adapted to Oncological Ward Wastewater (OWW) in a membrane bioreactor (MBR) was compared with that of a municipal WWTP, on the removal of pharmaceutical molecules and more specifically on their overall resistance and purifying ability in the presence of pharmaceutical cocktails. Sorption and biotransformation mechanisms...

The current work aims to study the biomass behaviour in a continuous mode activated sludge system (ASS) treating olive mill wastewater (OMWW) through an increasing OMWW Food to microorganism ration (F/M). To this end, the biomass growth, the specific oxygen uptake rate (SOUR), microbial characterisation, sludge volume index (SVI) as well as COD and...

In order to overcome the toxic effect of olive mill wastewater (OMWW) on biomass during biological treatment, this work will test OMWW biodegradation in a membrane bioreactor (MBR) using an acclimation procedure and will study its constraints. Special focus will be put on soluble microbial products (SMP) analysis in MBR and their impact on membrane...

The large diversity of metabolic capacities and the high genetic plasticity of microorganisms allow them to degrade virtually all organic compounds of natural or anthropogenic (xenobiotics) origin including those that are sources of environmental pollution. Thus microorganisms are major actors to eliminate or alleviate pollutions in the environment...

Physico-chemical and biological parameters were monitored both throughout different oxygen cut off and starvation (OCS) times (6 h–72 h) and after the restoration of normal operational conditions. Sludge apparent viscosity and soluble extracellular polymeric substances (EPS) characteristics were measured to determine the activated sludge (AS) prope...

This paper presents the treatment plants existing in Africa; it discusses the types of processes applied, the required treatment performance per country and the main challenges hindering their performance as well as the reuse of the treated wastewater. Key findings: • At least 7 out of 10 wastewater treatment plants are either waste stabilization p...

Euromembrane Conference 2012

Food to microorganisms ratio (F/M) and sludge retention time (SRT) are known to affect in different ways biomass growth, bioactivities and foulants characteristics. Thus the aim of this study was to dissociate the effects of SRT from those of F/M ratio on lab-scale membrane bioreactors performances during stable and unstable state. Two acclimations...

Compost liquor was treated using a combination of physico-chemical processes: (i) lime precipitation, (ii) filtration on a rotary drum vacuum precoat filter, (iii) ultrafiltration, and (iv) reverse osmosis. Laboratory Jar tests showed the interest of using lime to precipitate compost liquor. Yields of ammonium removal up to 90% were obtained for an...

Membranes are now commonly used in purification and treatment of drinking water and wastewater. The tightening of regulations elsewhere on landfill leachate disposal is now requiring more complicated filtration techniques. Philippe Moulin addresses how ultrafiltration modules are being applied to the area, as well as reverse osmosis developments.

The objective of the present paper is to examine the decolourization efficiency of textile effluent using different processes: coagulation/flocculation, enzymatic catalysis by commercial laccase and nanofiltration. A series of experiments are conducted on laboratory-prepared wastewaters combining chemically two reactive dyes (Blue Bezaktiv S-GLD 15...

This study is a first kinetic approach about the compost liquor treatment by activated sludge. This industrial wastewater is highly loaded in organic and nitrogen compounds (COD≈12,000 mg L(-1) and NH(4)(+)-N≈4,000 mg L(-1)). The possibility of its treatment in an urban WWTP is studied measuring ammonia oxidation rate with non-acclimated sludge to...

This study is a first kinetic approach about the compost liquor treatment by activated sludge. This industrial wastewater is highly loaded in organic and nitrogen compounds (CODE12,000 mg L À1 and NH 4 þ-NE4,000 mg L À1). The possibility of its treatment in an urban WWTP is studied measuring ammonia oxidation rate with non-acclimated sludge to the...

Although microorganism respiration inhibition by sodium azide (NaN3) is used in some studies to identify activated sludge adsorption capacity, little is known about the effect of this compound on the suspension properties. In this study we have investigated the effect of NaN3 addition on both volumetric oxygen mass transfer coefficient and rheology...

The aim of this paper was to determine the effect of two different membrane bioreactor (MBR) configurations (external/immersed) on sludge structure and microbial activity. Sludge structure was deduced from rheological measurements. The high shear stress induced by the recirculation pump in the external MBR was shown to result in decreasing viscosit...

An external ceramic membrane bioreactor was used to carry out an experimental study of process stability and fouling aspects for olive mill wastewater (OMW) treatment. Three diluted OMW solutions were used to continuously feed the reactor. An acclimated biomass was employed and the process stability was followed on the basis of the permeate quality...

The synthetic hormone 17alpha-ethinylestradiol (EE2) is primarily removed in wastewater treatment plants (WWTPs) by sorption, and nitrifying biomass has been shown to be responsible for EE2 biodegradation. Membrane bioreactor (MBR) technology was chosen to develop a community of autotrophic, nitrifying micro-organisms and determine kinetic paramete...

This paper aims to study the effect of temperature, pH and enzyme concentration on decolourization of separately two reactive textile dyes (Black Novacron R and Blue Bezaktiv S-GLD 150) used in reconstituted dye bath effluent (textile dye and auxiliary components) and in aqueous dye solutions (dye dissolved in deionised water) by a commercial lacca...

When natural disasters occur, the shortage of drinking water becomes a problem not only for the disaster victims, but also for the people involved in their rescue and safekeeping. A water purification unit has been designed, meeting specific criteria of efficiency, size, weight and power consumption. A hollow fiber ultrafiltration (UF) membrane mod...

Reverse osmosis membrane technology has developed over the past 40 years to a 44% share in world desalting production capacity, and an 80% share in the total number of desalination plants installed worldwide. The use of membrane desalination has increased as materials have improved and costs have decreased. Today, reverse osmosis membranes are the...

An experimental study of olive mill wastewater (OMW) treatment is undertaken in an external ceramic membrane bioreactor (MBR). The main objective of this work is the study of OMW treatment feasibility using an MBR with a biomass specially acclimated to phenol. The used reactor, equipped with an external ceramic microfiltration membrane gave stabili...

Reverse osmosis (RO) membrane desalination has been increasingly used to produce drinking water from salt water. Most of the United States has relied on fresh water resources to produce drinking water, but even water-rich regions, such as states in the northeast, are experiencing a strain on traditional resources. Furthermore, many regions lack suf...

In many locations, fresh water resources are insufficient for local needs, and alternative sources with lesser water quality are being considered as drinking water supplies. In particular, the United States has many inland regions with untapped brackish water (50010,000 mg/L total dissolved solids (TDS)) resources. Interest has increased for using...

Reverse osmosis (RO) membrane desalination has been increasingly used to produce drinking water from salt water. Many regions lack sufficient fresh water resources and are turning to alternate resources, such as seawater or brackish water, to sustain water needs. In particular, a growing number of inland communities have both insufficient fresh wat...

The xenobiotic 17α-ethinylestradiol, an oral contraceptive component, is an endocrine disrupter (EDC) of great concern, with fish feminization induced for concentrations as low as ng L−1. EE2 occurrence in the aquatic environment can be linked to insufficient removal in wastewater treatment plants. The focus of this review is to consider optimum tr...

This study is devoted to the triphasic in situ rheological characterisation of an activated sludge, with total suspended solid (TSS) ranging from 10 to 35g/L, and operated in a bioreactor under different stirring and aeration rates. The originality of this work is that flow properties are directly measured inside the bioreactor. Under low mechanica...

Most of effluents are regarded as biodegradable. That's why, in many cases, amvenlional treatment chain is composed by a biological process followed by a settling separation. Nevertheless, the strong industrial development produces effluents which are more and more concentrated and more and more complex. These effluents penalize the settling step i...

Leachates are harmful effluents which are generated from waste landfills. Organic and mineral elements make up leachate composition. Firstly, this article describes physico-chemical and biological mechanisms of molecules formation. Secondly, leachate classification is presented according to composition, which can be highly variable. A comparison wi...

Phenol biodegradation by mixed culture was studied in a membrane bioreac-tor (MBR) over a period of 285 days. Activated sludge was used as the MBR biomass, after controlled acclimation to high phenol concentrations. The MBR permeate flux was stabilized quickly (in a few hours) and always maintained above 90 L.h −1 .m −2 .bar −1 . The acclimatized a...

The synthetic hormone 17α-ethinylestradiol (EE2) is an endocrine disrupter of great concern with insufficient removal in wastewater treatment plants (WWTP) and subsequent impacts on the aquatic environment. In this paper, membrane bioreactor (MBR) technology was compared with conventional activated sludge (CAS) systems. Contrary to previous studies...

Phenol and their derivatives are widely used as raw material in the petrochemical industry and in oil refineries. The presence of phenols strongly reduces the biological degradation of the other components. This study shows the feasibility of the MBR treatment of a synthetic effluent containing a large amount of phenol. Using a biomass acclimated t...

The effect of adaptation of mixed culture in the phenol biodegradation has been studied. The degradation experiments have been conducted at different phenol concentrations from 0.5 to 3 g L−1. Biological treatment has been shown to be economical, practical and it leads to a complete removal of phenol. High concentrations of phenol are inhibitory fo...

Phenol and their derivatives are widely used as raw material in the petrochemical industry and in oil refineries. The presence of phenols strongly reduces the biological degradation of the other components. This study shows the feasibility of the MBR treatment of a synthetic effluent containing a large amount of phenol. Using a biomass acclimated t...

Phenol and their derivatives are widely used as raw material in the petrochemical industry and in oil refineries. The presence of phenols strongly reduces the biological degradation of the other components. This study shows the feasibility of the MBR treatment of a synthetic effluent containing a large amount of phenol. Using a biomass acclimated t...

Experimental work carried out on wastewater from a wastewater treatment plant (WWTP) showed that in a cross flow membrane bioreactor the gas/liquid transfer is highly dependent on the biomass concentration. In new biological wastewater membrane treatment processes (mostly using deep end membranes), the biomass concentration is usually about 15 g/L,...

Experimental work carried out on wastewater from a was-tewater treatment plant (WWTP) showed that in a cross flow membrane bioreactor the gas/liquid transfer is highly dependent on the biomass concentration. In new biological wastewater membrane treatment processes (mostly using deep end membranes), the biomass concentration is usually about 15 g/L...

This paper provides a detailed literature review of wastewater treatment in a membrane bioreactor process (MBR) with special focus on industrial wastewater treatment. MBR systems are compared with conventional wastewater treatment systems. The characteristics of the bioreactor treatment process (biomass concentration and floc size, organic and mass...

In industrial crystallization, attrition due to particle–crystallizer contacts is a primary source of generation of fragments, which greatly affects operating conditions, and the resulting size-distribution and morphology. The objective of this work is to contribute to the understanding of the attrition propensity of crystals in suspension, under c...

With the industrial scale, the synthesis of zeolites must imperatively be made out of agitated reactor. However a significant parameter of agitation must be taken into account: shearing. Shearing seems to have a harmful effect (when one seeks has a metastable form) on the stability of the zeolite thus synthesized on its purity.

Image analysis was used to characterise quantitatively the shapes of single crystals impacted against a target. The conditions of impacts are created to simulate the impacts undergone by the crystals in an industrial crystalliser. The change of particle morphology due to attrition enables to understand the abrasion and breakage mechanisms of the cr...