Addition of chemicals into the primary clarifier or aeration tank is employed to remove solids and organic matter from incoming wastewater. BOD and COD are the most relevant test to assess water quality; however, the delay in laboratory results often make the data unusable for chemical dose or adjustments. Optimization of chemical addition is important because adding too little will decrease treatment efficiency, while adding too much will not only increase chemical costs but also increase sludge production and disposal costs.
Monitoring BOD and COD in combination with TSS in real time allows chemical dose to be controlled in response to current wastewater quality conditions, decreasing the potential for under or over dosing.
- Cost savings from reduced chemical waste, decreased sludge production and disposal costs
- Improving water quality for upstream treatment processes