Evaluation of Occurrence, Concentration, and Removal of Pathogenic Parasites and Fecal Coliforms in Three Waste Stabilization Pond Systems in Tanzania

Table 3

Parasite concentrations and removal in the Mwanza WSP system.

Parasite group	Parasite species	Treatment stage
		Raw wastewater	Anaerobic ponds	Facultative ponds	Maturation ponds
Helminth species concentration (eggs/L)	Ascaris lumbricoides	19	0	0	0
	Hookworm	32	1.8	0.8	0.2
	Trichuris trichiura	0	0	0	0
	Trichostrongylus spp	8	0.4	12.2	2.3
	Fasciola spp	8	0	0	0
	Taenia spp	0	0	0	0
Total helminth concentration (eggs/L)		67	2.2	13	2.5
Helminth removal at each stage (%)			96.7	No reduction	80.8
Helminth removal from raw wastewater (%)			96.7	80.6	96.2
Protozoa species concentrations ((oo)cysts/L)	Giardia lamblia	9	1.6	0.2	0
	Entamoeba histolytica/dispar	80	3.2	0	0
	Entamoeba coli	127	5.6	1	0
	Cryptosporidium spp	12	1.6	0.6	0.3
	Isospora spp	3	0	0	0
Total protozoa concentration ((oo)cysts/L)		231	12	1.8	0.3
Protozoa removal at each stage (%)			94.8	85	83.3
Protozoa removal from raw wastewater (%)			94.8	99.2	99.8