Antibiotic Resistance Profile of Bacteria Isolated from Wastewater Systems in Eastern Ethiopia

Table 4

Mean value of selected biological and physicochemical characteristics of raw and effluent wastewater in the three monitoring sites and removal capacity of wastewater treatment facilities.

Site	Characteristics	Total coliform cfu/100 ml	Fecal coliform cfu/100 ml	Enterococci spp. cfu/100 ml	E. coli cfu/100 ml	BOD mg/L	COD mg/L	TSS mg/L	pH
ASS	Raw	5.14  10^8	2.45  10^7	1.31  10^8	1.17  10^7	737.67	931.33	707.67	7.23
	Effluent	3.18  10^5	5.12  10^4	3.93  10^5	2.75  10^4	73.17	119.33	63.50	9.45
	Log reduction	3.21	2.68	2.52	2.62	1.003	0.89	1.04
WSP	Raw	5.55  10^8	2.74  10^8	1.13  10^8	9.87  10^6	1108.33	1275.33	951.67	7.45
	Effluent	9.9  10^6	7.28  10^5	3.33  10^5	5.36  10^4	91.17	187.67	60.67	9.25
	Log reduction	1.74	2.57	2.53	2.26	1.08	0.83	1.19
STS	Raw	1.39  10^8	7.93  10^7	9.3  10^7	1.53  10^7
	Effluent	3.5  10^6	3.9  10^6	4.28  10^6	4.06  10^5
	Log reduction	1.59	1.3	1.33	1.57

ASS: activated sludge system, WSP: waste stabilization pond, STS: septic tank system, BOD; biochemical oxygen demand, COD: chemical oxygen demand, TSS: total suspended solid.