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2 Ecological Engineering & Environmental Technology

2 2023

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Green Microalgae as a Food Source – Growth Kinetics and Biochemical Composition

El-Haji Sarra, Houzi Ghizlane, Kaioua Samiha, Abdelaziz Chaouch

Ecological Engineering & Environmental Technology

2023

Vol. 24, iss. 7

154--160

Microalgae are considered as a renewable natural resource that presents important potentialities to be valorized in several fields. This valorization must necessarily start with a thorough study of the biochemical composition of each species of algae. The objective of this study is to study the evolution of the biochemical composition according to the different stages of growth of three biomasses of microalgae (Fragilaria sp, Scenedesmus protuberans, Polytoma Papilatum) collected from Moroccan aquatic environments. Polytoma Papilatum and Scenedesmus protuberans show high protein content of 89.23±2.58%, 90.4±1.45% respectively in addition to low lipid 2.4±0.23, 1.63±0.2% and carbohydrate 8.08±1.25, 8.19±1.07 respectively. On the other hand, Fragilaria sp has high value of carbohydrate 65.73±3.25% as well as low in protein and lipid contents with values of 33.16±1.76, 1.28±0.29 respectively. The monitoring of the growth kinetics allows differentiating three phases on the growth curve: latent phase, exponential growth phase, and stationary phase. Regarding the biochemical composition, the highest content of proteins, carbohydrates and lipids in relation to the harvested biomass reach its maximum at the stationary phase.

Evaluation of the Impact of Anthropic Activities on the Physico-Chemical and Microbiological Parameters of the Water of the Wadi Inaouene and Its Tributaries

Rezouki Sanae, El-Haji Sarra, Moubchir Tarik, Faouzi Jihan, Bendaoud Ahmed, Beniaich Ghada, Allali Aimad, Eloutassi Noureddine

Ecological Engineering & Environmental Technology

2023

Vol. 24, iss. 5

282--294

Water is a basic human requirement that is required in many processes, particularly those performed in households. However, in most circumstances, this critical product does not fulfill commonly recognized safety criteria. Various anthropogenic activities cause various forms of pollution; as a result, their physicochemical and biological components can pose major hazards to the environment and human health. The objective of this research was to evaluate the microbiological parameters along the Inaouene wadi and its tributaries, as well as their correlation with the physicochemical characteristics. In spring 2020, the following physicochemical and microbiological studies were conducted: ICP-AES was used to assess metals. The most polluted stations are located upstream (S1, S3, S4, S5, and S6). The highest concentrations of sulfate, orthophosphate, BOD5 , and nitrogen compounds are found at these stations. Illegal solid and liquid discharges from the tributaries S1 and S5, as well as urban settlements built on the banks of the Inaouen River, are to blame for this pollution, which has a direct and significant impact on water quality throughout the wadi. Furthermore, heavy metals (Zn, Fe, Co, Cr, Ag, and Cu) are abundant upstream of Inaouen and pass downstream. The monitoring of the evolution of microbiological pollution of wastewater has revealed a significant contamination of these waters upstream of the Wadi by the 3 groups of germs indicative of a fecal contamination and the presence of Listeria monocytogenes and salmonella in the upstream stations and especially S1, S3 and S5. The PCA revealed that the indicator bacteria of fecal contamination present negative correlations with dissolved oxygen, thus the lack of dissolved oxygen leads to a proliferation of germs in the water.