A Preliminary Study of Banana Stem Juice as a Plant-Based Coagulant for Treatment of Spent Coolant Wastewater

Table 4

Compliance of treated spent coolant wastewater using banana stem juice with Malaysian standard effluent discharge limit.

Parameters	Raw spent coolant wastewater (mg/L)	Treated spent coolant wastewater (mg/L)	Standard effluent discharge limit (mg/L)
		banana stem juice	A	B
pH	8.45	7	6.0–9.0	5.5–9.0
Chemical oxygen Demand (COD)	152,400	30, 300	50	100
Suspended solid (SS)	8,880	1,010	50	100
Turbidity	81,250 NTU	1,235 NTU	—	—

All values except for pH and turbidity are expressed in mg/L.