Mohammed Danouche

Mohammed VI Polytechnic University · Chemical & Biochemical Sciences

Phosphogypsum (PG) is generated annually from phosphoric acid production. This by-product contains 50% of sulfate (SO42−), which can be recycled biologically. Biorecovery of elemental sulfur (S0) involves firstly converting SO42− into biogenic sulfide using sulfate-reducing bacteria under anaerobic conditions, then oxidizing the sulfide produced in...

Phosphogypsum (PG) is the largest by-product of the phosphate industry. Nearly 300 M tons of PG are annually discarded, of which 58% is dry stacked. The exposure of PG stacks to rainwater and processed waters moisture creates hydraulic pressure, generating acidic PG leachates into nearby aquifer systems. Because of its elevated levels of sulfates,...

Phytotherapy, which involves the use of plant extracts and natural compounds for medicinal purposes, is indeed a promising alternative for managing urinary lithiasis. Many plants have been studied for their potential to prevent and treat kidney stones, and they may offer a more natural and potentially less harmful approach compared to conventional...

A new Advanced Oxidation process (AOP) using the ultrasound-photo-Fenton process (US-P-FP) was used to treat stabilized landfill leachate from Fez City (Morocco). The effectiveness of the US-P-FP for landfill leachate treatment was investigated in terms of COD, UV254, and color removal. The operating factors (Fe2+ dosage, pH, H2O2 dosage, ultrasoni...

Phosphogypsum (PG), a by-product of the phosphate industry, is high in sulfate, (SO42-), which makes it an excellent substrate for sulfate-reducing bacteria (SRB) to produce hydrogen sulfide. This work aimed to optimize SO42- leaching from PG to achieve a high biological reduction of SO42- and generate high sulfide concentrations for subsequent use...

ynthetic toxic dyes from liquid wastes can be harmful for living organisms and the environment, even at low concentrations. This research investigated the utilization of the Chenopodium quinoa pericarp bio-waste (QBW) after saponin glycosides extraction as biosorbent in the removal of methylene blue (MB) dye as a model contaminant from aqueous solu...

Microalgae and cyanobacteria are photosynthetic microorganisms that can be used to bioremediate anthropogenic pollutants from air, water and soil. These organisms can remediate several anthropogenic pollutants, such as carbon dioxide, nitrates and phosphates, heavy metals, pharmaceuticals, pesticides and persistent organic pollutants. The biomass g...

Organic contaminants are among the main pollutants of ecosystems because of their presence in domestic, agricultural, or industrial effluents. Indeed, many organic xenobiotics such as aromatic hydrocarbons, pesticides, synthetic dyes, etc., are not easily biodegradable in the environment and can therefore accumulate in ecosystems causing various to...

The transition of the mineral processing sectors, which depend mainly on various petroleum-origin chemicals, to the green industry based on the production of greener materials and the reduction of carbon footprints, is mandatory due to the growing concerns regarding the extensive environmental impact of the mining industry. In this context, biologi...

The biomass of a yeast stain of Wickerhamomyces anomalus was evaluated as a natural biosorbent for the removal of Acid Red14 dye (AR14) in batch experiments. The outcome revealed a maximum biosorption capacity of 71.37 mg g⁻¹. Biosorption kinetic followed both the pseudo-second-order and intra-particle-diffusion model, while thermodynamic parameter...

This study highlights the mechanisms of Pb(II)-phycoremediation using the Pb(II) tolerant strain of Scenedesmus obliquus. First, monitoring of cell growth kinetics in control and Pb(II)-doped medium revealed significant growth inhibition, while the analyses through flow cytometry and Zetasizer revealed no difference in cell viability and size. Resi...

Microalgae are among the oldest life forms on Earth and over centuries of evolution they have developed adaptive mechanisms that allow them to survive harsh environmental conditions, including exposure to toxic xenobiotics such as heavy metals (HMs). The response of microalgae to HM stress is like that occurring under any other stress conditions; i...

High soil salinity is a major abiotic stress affecting the growth, nutrition, development, and productivity of crops. This study investigated the modulating effect of combined microalgae-cyanobacteria extract formulations (MEF1%, MEF5%, and MEF10%) prepared from the species Dunaliella salina, Chlorella ellipsoidea, Aphanothece sp., and Arthrospira...

Water pollution is a significant global issue affecting millions of people. This thesis focuses on exploring new strategies for treating organic and metallic pollutants using microalgae for phycoremediation of inorganic pollutants and yeasts cells for mycoremediation of organic contaminants. Eight microalgae strains were screened to determine thei...

This study aimed to evaluate the potential application, and the involved mechanism in the biosorption of Acid Red 14 (AR 14 ) by the biomass of Wickerhamomyces anomalus. Kinetics and biosorption isotherms were first examined. Then, the physicochemical characterization of cells-AR 14 interactions was determined using scanning electron microscopy cou...

Heavy metal (HM) contamination of water bodies is a serious global environmental problem. Because they are not biodegradable, they can accumulate in food chains, causing various signs of toxicity to exposed organisms, including humans. Due to its effectiveness, low cost, and ecological aspect, phycoremediation, or the use of microalgae's ecological...

This study highlights the mechanisms involved in Pb(II)-phycoremediation using the Pb(II) tolerant strain of Scenedesmus obliquus . Firstly, monitoring of cell growth kinetics in control and Pb(II)-doped medium revealed a significant growth inhibition, while the analyses through flow cytometry and Zetasizer revealed no difference in cell viability...

Biosorption processes have recently become an economic and eco-friendly solution for the treatment of industrial wastewater. This study aimed to evaluate the potential application of Wickerhamomyces anomalus as a natural biosorbent for the removal of toxic synthetic dye Acid Red 14 (AR14). Biosorption kinetics modelling showed that the pseudo-secon...

Dye efuents released from various industries, notably the textile sector, are hazardous, and can cause signifcant damage to the environment. Thus, treatment and detoxifcation of these toxic dyes are of major concern for compliance with environmental legislations. So far, a number of physicochemical dye-removal methods have been proposed. However, d...

Dye effluents are among the most polluted wastewaters that require adequate treatment before their discharge into the environment. They have multiple chemical properties that allow them great resistance to environmental conditions, such as the persistence of coloured fabric against washing, exposure to light, chemicals, and biological attacks. Howe...

This study investigated the dye decolorization capacity of three yeast strains. Cyberlindnera fabianii was shortlisted for its high decolorization capacity and was further tested on various azo dyes. Based on the color of the biomass, and the UV–Vis analysis, Acid Red 14 was selected as a model dye, to examine the enzymatic biodegradation. The resu...

Heavy metal pollution is one of the most serious problems facing the world today. Given their toxicity and persistence in the environment, the treatment of these pollutants is of great concern. The use of microalgae is a promising solution for the remediation of metal-contaminated wastewater. In the present work, eight microalgae strains: Chlorella...