Marie Deborde

Bio: Marie Deborde is an academic researcher from Swiss Federal Institute of Aquatic Science and Technology. The author has contributed to research in topics: Effluent & Reactivity (chemistry). The author has an hindex of 1, co-authored 1 publications receiving 1280 citations.

Olive Oil Liquid Wastes–Characteristics and Treatments: A Literature Review

Abstract: Olive oil sector witnesses an important growth due to the health benefits related to the product. However, olive oil producing countries suffer from the considerable amount of wastewater generated at the end of the process. Olive oil wastewater is a powerful pollutant. The nature of this effluent is highly variable due to various factors that should be taken into consideration. Generally, the nature of this wastewater is oily and contains a high organic load and low biodegradability due to the high content of phenols. Currently, it is discarded in the majority of countries, especially with the absence of uniform legislation for its treatment and reuse. Thus, olive mill wastewater represents a severe environmental pollution problem. Various studies suggested different types of treatment to deal with olive mill wastewater. However a low-cost and effective treatment remains a challenge on the practical part. This review aims to highlight the olive oil production with a special interest in the physico-chemical and biological characteristics of all the types of olive liquid waste, from olive washing wastewater and olive mill wastewater. In addition, the variability in olive wastewater composition based on various factors has been explored. Finally, different treatments techniques tested and applied on olive liquid waste were documented. This work will allow researchers to easily understand the variability of olive liquid waste’s characteristics and factors to study when dealing with this effluent. Moreover, it will help researchers for a better knowledge related to olive liquid waste treatments and challenges faced.

Single and Coupled Electrochemical Processes and Reactors for the Abatement of Organic Water Pollutants: A Critical Review.

Abstract: Traditional physicochemical and biological techniques, as well as advanced oxidation processes (AOPs), are often inadequate, ineffective, or expensive for industrial water reclamation. Within this context, the electrochemical technologies have found a niche where they can become dominant in the near future, especially for the abatement of biorefractory substances. In this critical review, some of the most promising electrochemical tools for the treatment of wastewater contaminated by organic pollutants are discussed in detail with the following goals: (1) to present the fundamental aspects of the selected processes; (2) to discuss the effect of both the main operating parameters and the reactor design on their performance; (3) to critically evaluate their advantages and disadvantages; and (4) to forecast the prospect of their utilization on an applicable scale by identifying the key points to be further investigated. The review is focused on the direct electrochemical oxidation, the indirect electrochemical oxidation mediated by electrogenerated active chlorine, and the coupling between anodic and cathodic processes. The last part of the review is devoted to the critical assessment of the reactors that can be used to put these technologies into practice.

Environmental Implications of Hydroxyl Radicals ((•)OH).

Abstract: The hydroxyl radical (•OH) is one of the most powerful oxidizing agents, able to react unselectively and instantaneously with the surrounding chemicals, including organic pollutants and inhibitors. The •OH radicals are omnipresent in the environment (natural waters, atmosphere, interstellar space, etc.), including biological systems where •OH has an important role in immunity metabolism. We provide an extensive view on the role of hydroxyl radical in different environmental compartments and in laboratory systems, with the aim of drawing more attention to this emerging issue. Further research on processes related to the hydroxyl radical chemistry in the environmental compartments is highly demanded. A comprehensive understanding of the sources and sinks of •OH radicals including their implications in the natural waters and in the atmosphere is of crucial importance, including the way irradiated chromophoric dissolved organic matter in surface waters yields •OH through the H2O2-independent pathway, and the ...

The roles of reactive species in micropollutant degradation in the UV/free chlorine system.

Abstract: The UV/free chlorine process forms reactive species such as hydroxyl radicals (HO•), chlorine atoms (Cl•), Cl2•–, and O•–. The specific roles of these reactive species in aqueous micropollutant degradation in the UV/chlorine process under different conditions were investigated using a steady-state kinetic model. Benzoic acid (BA) was chosen as the model micropollutant. The steady-state kinetic model developed fitted the experimental data well. The results showed that HO• and Cl• contributed substantially to BA degradation, while the roles of the other reactive species such as Cl2•– and O•– were negligible. The overall degradation rate of BA decreased as the pH increased from 6 to 9. In particular, the relative contributions of HO• and Cl• to the degradation changed from 34.7% and 65.3% respectively at pH 6 to 37.9% and 62% respectively at pH 9 under the conditions evaluated. Their relative contributions also changed slightly with variations in chlorine dosage, BA concentration and chloride concentration. ...

Challenges and Opportunities for Electrochemical Processes as Next-Generation Technologies for the Treatment of Contaminated Water

Abstract: Electrochemical processes have been extensively investigated for the removal of a range of organic and inorganic contaminants. The great majority of these studies were conducted using nitrate-, perchlorate-, sulfate-, and chloride-based electrolyte solutions. In actual treatment applications, organic and inorganic constituents may have substantial effects on the performance of electrochemical treatment. In particular, the outcome of electrochemical oxidation will depend on the concentration of chloride and bromide. Formation of chlorate, perchlorate, chlorinated, and brominated organics may compromise the quality of the treated effluent. A critical review of recent research identifies future opportunities and research needed to overcome major challenges that currently limit the application of electrochemical water treatment systems for industrial and municipal water and wastewater treatment. Given the increasing interest in decentralized wastewater treatment, applications of electrolytic systems for treat...