TABLE 3.

Indigenous coliphage recovery from serial extractions of biosolids

Property	Experiment
	1	2	3	4
Biosolids (%)	1.7	1.9	1.7	7.0
Original sample vol (ml)	10	10	25	15
Total mass of dry biosolids (g)	0.174	0.186	0.425	1.05
No. of extractions performed	5	10	17	58
Total PFU recovered from supernatant per g dry biosolidsa	8.68 · 104	1.19 · 105	4.24 · 104	2.65 · 105
PFU recovered from last pellet per g dry biosolidsb	5.11 · 103	1.86 · 104	2.39 · 103	8.10 · 103
Total PFU per g dry biosolidsc	9.19 · 104	1.38 · 105	4.48 · 104	2.72 · 105

^aSum of PFU recovered for all extractions divided by the amount of dry g of biosolids.

^bPFU recovered in last pellet divided by the amount of dry g of biosolids.

^cTotal PFU/g dry biosolids = (total PFU recovered in supernatant + PFU recovered in last pellet)/g dry biosolids.