Utilization of Waste Materials for Microbial Carrier in Wastewater Treatment

Table 2

Physiological and biochemical characteristics of bacteria on corncob and concrete carriers.

Sample	Gram stain	Shape	Catalase test	Characteristics of colony	Color of colony	Number of isolates
Unused corncob carrier	Negative	Rod		Smooth	White-turbid	1
	Negative	Rod		Smooth	White-turbid	2
Used corncob carrier (surface)	Negative	Cocci		Curly	White-turbid	4
	Negative	Cocci		Smooth	White-turbid	4
Used corncob carrier (core)	Negative	Cocci		Curly	White-turbid	2
	Negative	Cocci		Smooth	White-turbid	2
Unused concrete carrier	Not detected	Not detected	Not detected	Not detected	Not detected	Not detected
Used concrete carrier (surface)	Negative	Cocci		Smooth	White-turbid	3
	Positive	Rod		Smooth	White-turbid	1
Used concrete carrier (core)	Negative	Cocci		Smooth	White-turbid	7
	Negative	Cocci		Smooth	Brown	1

Symbols: positive, negative.