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

Table 2

Parasite concentrations and removal in the Morogoro WSP system.

Parasite group	Parasite species	Treatment stage
		Raw wastewater	Anaerobic pond	Facultative pond	Maturation ponds
Helminth species concentrations (egg/L)	Ascaris lumbricoides	12	0.8	0	0
	Hookworm	0	0	0	0
	Trichuris trichiura	0	0	0	0
	Trichostrongylus spp	0	0	0	0
	Fasciola spp	0	0	0	0
	Taenia spp	0	0	0	0
Total helminth concentration (egg/L)		12	0.8	0	0
Helminth removal at each stage (%)			93.3	100	—
Helminth removal from raw wastewater (%)			93.3	100	100
Protozoa species concentrations ((oo)cysts/L)	Giardia lamblia	22	32.4	5.4	0
	Entamoeba histolytica/dispar	26	15.6	0.3	0
	Entamoeba coli	248	194.8	47.9	0.8
	Cryptosporidium spp	72	60.4	23.7	3.5
	Isospora spp	0	0	0	0
Total protozoa concentration ((oo)cysts/L)		368	303.2	77.3	4.3
Protozoa removal at each stage (%)			17.6	74.5	94.4
Protozoa removal from raw wastewater (%)			17.6	79	98.8