Optimization of Ozonation Process for the Reduction of Excess Sludge Production from Activated Sludge Process of Sago Industry Wastewater Using Central Composite Design

Table 1

Physicochemical characteristics of sago effluent.

Parameters	Values
pH	4.8
Total suspended solids (TSSs)	2689
Volatile suspended solids (VSSs)	1576
Chemical oxygen demand (COD)	13040
Settleable solids (SSs)	200
Phosphate	36.5
Nitrate	46
Sulphate	70
Carbohydrate	7.9
Starch	0.567

Except pH and settleable solids all other parameters are in mg/L. Settleable solids mL/L.