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Study the Effectiveness of the Natural Lagoons for Removal of Organic Matter, Nutrients and Fecal Coliform from Urban Domestic Wastewater under Arid Climate (Morocco)

Osmane Ahmed, Zidan Khadija, Benaddi Rabia, Sebah Imane, Elmouraille Nadia, Ait Ali Mustapha, Belmouden Moustapha

Journal of Ecological Engineering

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2023

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Vol. 24, nr 2

196--207

EN

Morocco is one of the countries most affected by the scarcity of water resources and the poor distribution of rainfall. Natural lagoon is the most widely used treatment process in Morocco. Indeed, Morocco is a sunny country throughout the year. The lagoon system requires minimal effort in operation and maintenance. Moreover, this system is the best process for removing bacteria indicators. For these reasons, a study of the purification performance of natural lagoons during five years, located in Chichaoua region (Morocco) was carried out. The lagoon system was monitored for five years, with measurements taken every three months at the input and output of the system. It received a hydraulic loading rate (HLR) between 1171 and 2760 m3 with an average of 2053 m3/day. The obtained results show the removal of 37% of TSS, 63% of BOD5, 60% of COD, 61% of NH4+, 37% of TP, and 6.5 log units of coliforms during the mentioned monitoring period. Thus, the effluent values do not always comply with the Moroccan water quality requirement for irrigation reuse. Additionally, the statistical analyses confirm the presence of a strong linear correlation between almost all variables in the lagoon output. Therefore, the performance efficiency of the lagoon in removing organic matter and nutrients was significantly (p < 0.05) dependent on the season. However, the fecal contamination was not significantly (p > 0.05) affected by the seasons in this study. At the end of this study a complementary treatment before the reuse of treated wastewater, was proposed.

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Monitoring of Physicochemical and Microbiological Quality of Taghazout Seawater (Southwest of Morocco): Impact of the New Tourist Resort "Taghazout Bay"

Lamine Imane, Alla Aicha Ait, Bourouache Mohamed, Moukrim Abdellatif

Journal of Ecological Engineering

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2019

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Vol. 20, nr 7

79--89

EN

The marine environment plays a major socio-economic role in the Agadir region (south-west Morocco). This area, which hosts important fishery resources, is currently not spared from the pollutants produced in the course of agricultural, domestic, industrial and tourist development. The aim of this study is to assess the impact of the Taghazout bay tourist resort on the bacteriological and physicochemical quality of the coastal waters of Taghazout. The seawater samples were collected between March 2016 and March 2018 at three sampling sites (S1, S2 and S3) in order to monitor the concentrations of fecal coliforms (FC), fecal streptococci (FS) and total germs (TG). The results of physicochemical parameters show seasonal fluctuations influenced by climatic factors. The spatio-temporal monitoring of the bacteriological parameters shows that the average total germ count is 127.05 CFU/100 ml, 39.61 CFU/100 ml for fecal coliforms and 15.21 CFU/100 ml for fecal streptococci. The values of FC80, FC95 and FS90 do not exceed the guide values of the Moroccan standards. This classifies the Taghazout beach in category A (good quality of bathing water). The monitoring analysis recorded by the Pearson correlation test between the environmental parameters and the level of fecal bacteria showed that there was a significant positive correlation between the FC concentrations and rainfall; the FS concentrations showed significant positive correlations with all the environmental parameters while the TG concentrations indicate no correlation with them. The fecal contamination parameters should be routinely monitored for improving the environmental conditions of coastal cities. This must be the case for the Taghazout coastline where a regular monitoring program must be established to evaluate the impact of the new tourist resort “Taghazout bay” on the environmental quality of this ecosystem.

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Testy Colilert - szybkie wykrywanie oraz ilościowe oznaczanie bakterii grupy coli

Kręgiel D.

Laboratorium - Przegląd Ogólnopolski

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2013

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nr 3-4

32--36

PL

Woda przeznaczona do picia i na potrzeby przemysłu spożywczego musi być wolna od bakterii chorobotwórczych. Wśród patogenów rozpowszechnionych w środowisku wodnym najczęściej izolowane są bakterie pochodzenia kałowego. W pracy rutynowej nie jest możliwe zbadanie wody w kierunku wszystkich organizmów chorobotwórczych, stąd też konieczne stało się wytypowanie tzw. wskaźników zanieczyszczenia, o których mowa w poniższym artykule.

EN

Water for drinking and for the food industry must be free of pathogenic bacteria. Among pathogens common in aqueous medium, faecal bacteria are usually isolated. In the routine work it is not possible to examine all the water in the direction of the pathogenic organisms, and therefore it was necessary to predict the known indicators of pollution.