Helminth prevalence in a waste-water plant at El Rosal, Cundinamarca

• Published in: Revista de salud pública (Bogotá, Colombia) Vol. 14; no. 2; pp. 296 - 304
• Main Authors: Ortiz, Carolina, López, Myriam C, Rivas, Favio A
• Format: Journal Article
• Language: Spanish
• Published: Colombia 01-03-2012
• Subjects: Animals; Colombia; Helminths - isolation & purification; Parasite Egg Count - statistics & numerical data; Waste Water - parasitology; Water Purification; Water Quality; Colombia
• ISSN: 0124-0064

Assessing helminth egg prevalence in sludge and raw and treated wastewater from a wastewater treatment system located in the village of El Rosal, Cundinamarca.
30 wastewater and 10 sludge samples from the El Rosal plant were taken during a 10-week period. The sludge and water samples were processed according to the Bailinger and the official Mexican standard methodology, respectively. Egg viability was determined by the method described by Victórica & Galván and the Mexican official standard.
Descriptive statistics were used for analysing data. 100 % of the untreated wastewater samples showed the presence of eggs and at least one viable helminth egg/litre was found in 90 % of them. 90 % of the treated wastewater samples were positive for the presence of eggs, finding that 70 % had at least one viable egg. All raw wastewater samples being dumped directly into the stream were positive for helminths; the same situation was found at the time of the viability test. All sludge samples were positive for helminths, finding that 100 % of these had at least one viable egg.
Using this water for crop irrigation and using the sludge as fertiliser is a potential risk for public health. The sludge can only be used in forestry activities, as long as it does not come into contact with humans.