What represents the total of CBOD and NOD?

The total of CBOD (Carbonaceous Biochemical Oxygen Demand) and NOD (Nitrogenous Oxygen Demand) is best represented by the term BODtotal. This measurement encapsulates both the carbon and nitrogen demands of wastewater, indicating the overall oxygen required to decompose organic material in the presence of microorganisms.

In wastewater treatment, CBOD focuses specifically on the oxygen demand attributable to the carbon compounds, whereas NOD accounts for the oxygen demand from nitrogenous sources, typically arising from ammonia. By summing both components, BODtotal provides a comprehensive understanding of the biodegradable matter in wastewater.

This approach is essential for evaluating treatment processes and designing treatment facilities, as it informs operators of the total oxygen requirement needed to effectively remediate the treated effluent. Therefore, the answer that represents this total is BODtotal.