Predicting Optimum Dilution Factors for BOD Sampling and Desired Dissolved Oxygen for Controlling Organic Contamination in Various Wastewaters

Table 1

Estimated average and minimum BOD_t and water temperature rise impact with the corresponding BOD₅/COD, experimental dilution factor (df), and average df range for the various studied wastewater types.

Wastewater type (Abbrev.)	BODt (mg/L)	Min. BODt (mg/L)	BODt (mg/L) vs. temperature (per every 1°C)	BOD5/COD	df	df range
Storm (STM)	40–78	16–55	+1.2	0.1 0.35	9.2	4.5–13.5
Industrial (IND)	>90,000	<80,000	+2 to +3	0.36 0.5	12 × 10^3	1–22
Domestic (DOM)	130–260	50–170	+4	0.4 0.48	18.5–28.5	12–35

Average values from k₁ @ T = 20°C, which correspond to the selected wastewater type experimental results.