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2 Journal of Water and Land Development

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The removal efficiency and reaction mechanism of the aluminum coagulant on phenolic compounds in the presence of hardness salts

Hecini Lynda, Boukerker Hassen, Kherifi Wahida, Mellah Abdelkarim, Achour Samia

Journal of Water and Land Development

2022

no. 54

225--233

This study is the evaluation of the coagulation efficiency of the aluminum sulfate on the removal of catechol and pyrogallol. The study has focused on the impact of inorganic components of hardness Algerian waters. Jar-test trials were conducted on the two phenolic compounds dissolved in distilled water only, which was later enriched with minerals. Several reaction parameters varied, including the effect of pH and the influence of the salt content, and this approach yielded a better understanding of interaction between phenolic compounds and calcium/magnesium salts. The results indicate that the process efficiency depends on the number and position of OH in molecules. The main mechanisms would be either a physical adsorption, an exchange of ligand, or complexation on the floc surface of aluminum hydroxide. Moreover, the addition of inorganic salts appears to improve removal efficiency of tested phenolic compounds and have an effect on the optimal pH range for coagulation.

Faecal contamination of water in the Lake Mellah and its catchment area, north-eastern Algeria

Kherifi Wahida, Hecini Lynda, Bekiri Fedia, Kherici-Bousnoubra Houria

Journal of Water and Land Development

2019

no. 42

110--116

Lake Mellah close to the Mediterranean Sea in north-eastern Algeria belongs to valuable ornithological sites with numerous, often migratory, birds. To achieve the research goal, seventeen (17) sampling points were sampled based on the urbanization of the watershed. Water samples were taken at different wadis levels (upstream and downstream of settlements), as well as at the wastewater treatment plant and in Lake Mellah based on four measurement campaigns conducted at one frequency seasonal (high water, low water) during the year (2011/2012). Biological parameters (coliform faecal bacteria, streptococci) were analysed in water of the lake and its affluents in the laboratory of the Department of Health and Population, El Taref by the most probable number (MPN) technique of the Mac Grady table taken from various points. Obtained results were processed by the use of Bourgeois ratio (coliform faecal bacteria: streptococci) to indicate the origin of faecal contamination of waters and to establish maps of the spatio-temporal evolution of this ratio by the software Surfer 9. This way we obtained information of contamination of human origin during the dry season coming from domestic waste waters. In winter the ratio showed animal prevalence of contamination coming primarily from Animal Park in El Kala.

Jezioro Mellah, położone blisko Morza Śródziemnego, w północnowschodniej Algierii, zalicza się do cennych siedlisk ornitologicznych ze względu na liczne, często migrujące, ptaki. Aby osiągnąć cel badań, pobierano próbki z siedemnastu punktów usytuowanych na terenach zurbanizowanych na obszarze zlewni. Próbki wody pobierano z różnych odcinków cieków (górne i dolne), jak też przy oczyszczalni ścieków i z jeziora Mellah w trakcie czterech sesji pomiarowych. W próbkach wody z różnych stanowisk w jeziorze i jego dopływach w laboratorium Katedry Zdrowia i Ludności, w El Taref analizowano parametry biologiczne (bakterie grupy coli i streptokoki) poprzez określenie najbardziej prawdopodobnej liczby (NPL) drobnoustrojów z wykorzystaniem tabel McGrady’ego. Przetwarzano uzyskane wyniki celem ustalenia źródła zanieczyszczeń kałowych w wodach i określenia przestrzennej i czasowej zmienności tego stosunku. Wykorzystano do tego stosunek Bourgeois. W ten sposób uzyskano informacje o zanieczyszczeniach pochodzących w porze suchej ze ścieków bytowych. Zimą zanieczyszczenia pochodziły głównie od zwierząt z parku w El Kala.