Table 1.

Yearly average primary sludge characteristics (2020) at Ottawa WRRF and Hamilton Woodward WRRF.

	Yearly average Ottawa WRRF primary sludge characteristics (avg. ±standard dev.)	Yearly average Hamilton Woodward WRRF primary sludge characteristics (avg. ±standard dev.)
Chemical oxygen demand (mg/L)	49,959.4 ± 8221.1	41,150.0 ± 12,264.3
Total Kjeldahl nitrogen (mg N/L)	1202.1 ± 187.4	1453.0 ± 381.2
Total phosphorus (mg P/L)	376.1 ± 59.7	506.5 ± 104.0
Conductivity (uS/cm)	1968.5 ± 203.5	1492.8 ± 319.9