Sludge nematodes, cestodes, and trematodes eggs variation from lagooning, activated sludge and infiltration-percolation wastewater treatment system under semi-arid climate

• Published in: Environmental science and pollution research international 2019, Vol.26 (1), p.570-576
• Main Authors: El Fels, Loubna, El Hayany, Bouchra, El Faiz, Abdelouahed, Saadani, Mustapha, Houari, Mustapha, Hafidi, Mohamed
• Format: Article
• Language: English
• Subjects: Activated sludge; Animals; Aquatic Pollution; Arid climates; Aridity; Ascaris; Atmospheric Protection/Air Quality Control/Air Pollution; Capillaria; Cestoda; Climate; Decantation; Demographics; Earth and Environmental Science; Ecotoxicology; Eggs; Environment; Environmental Chemistry; Environmental Health; Environmental science; Helminths; Infiltration; Nematoda; Nematodes; Organic chemistry; Parasites; Percolation; Pools; Primary sludge; Purification; Raw sewage; Research Article; Sand filters; Schistosoma; Seasonal variations; Semiarid climates; Sewage - parasitology; Sewage sludge; Sludge; Sludge settling; Socioeconomics; Species; Taenia; Taxa; Toxocara; Trichuris; Waste Disposal, Fluid; Waste Water; Waste Water Technology; Wastewater purification; Wastewater treatment; Water Management; Water Pollution Control; Water treatment
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-018-3618-2

The prevalence and the identification of the helminth eggs load of raw sewage sludge was assessed of three different wastewater treatment systems. The results showed a variety of parasite species with following average concentrations; five taxa belonging to three classes nematodes, cestodes and trematodes were inventoried. The class of nematodes is the most diverse with 5 taxa. It is represented by the eggs of Ascaris sp. , Capillaria sp. , Trichuris sp. , Toxocara sp. , and Ankylostome sp. , then comes the cestodes class, this is represented by the eggs of Tænia sp . The trematode class is represented by Schistosoma sp . The lagooning station of Chichaoua shows the highest load 7 species with Ascaris 21 eggs/g; Capillaria sp. , 11 eggs/g; Trichuris sp. , 6 eggs/g; Toxocara sp ., 2 eggs/g and Ankylostome sp. , 1 egg/g; Taenia sp. , 2eggs/g; and Schistosoma sp. , 1 egg/g. Infiltration-percolation sludge show the presence of 4 species of helminths eggs in sludge from anaerobic settling with different rates: 15 eggs/g for Ascaris sp. , 15 eggs/g for Trichuris sp. , 13 eggs/g for Capillaria sp. , and 8 eggs/g for Taenia sp. However, in sand filter pool, the sludge helminth eggs load was decreased by 47% of Ascaris sp. , 85% of Capillaria sp ., and 75% of Taenia sp ., Nevertheless, an increase of Trichuris eggs load was noted in the second sludge by 17%. Five helminth eggs was detected in primary sludge coming from decantation pools in activated sludge plant in Marrakech, that is Ascaris sp. , with a load of 16 eggs/g; Capillaria sp. , with 3 eggs/g, Trichuris eggs with 2 eggs/g; Taenia sp. , with 4 eggs/g; and Schistosoma sp ., with 2 eggs/g. The abatement load of Ascaris sp. with 81% and Schistosoma and Taenia sp. , with 100% was noted in biological sludge. Nevertheless, an increase load of Capillaria and Trichuris eggs 81% and 75% respectively was observed in this sludge coming from biological pools. The distribution of parasitic helminth eggs is linked to the differences in demographic and socio-economic status, seasonal variation, physico-chemical characteristic of helminth eggs, and the purification wastewater system performance.