Table 2.

Morphological and biochemical characteristics of selected bacterial isolates.

Test	EF-01	SL-10	SO-25
Surface	Smooth	Smooth	Rough
Colony shape	Circular	Irregular	Irregular
Color	Greenish yellow	white	White
Margin	Entire edge	Filamentous	Lobate
Elevation	Flat	Convex	Raised
Cell shape	Rod	Rod	Rod
Gram stain	−	−	+
KOH test	+	+	−
Endospore	−	−	+
Catalase test	+	+	+
Oxidase test	+	+	+
O/F test	F+	O+	−
Suggested genus	Aeromonas sp.	Pseudomonas sp.	Bacillus sp.

O: oxidative, F: fermentative, +: positive, −: negative, SL: isolated from sludge, EF: isolated from effluent, and SO: isolated from soil.