Clean Energy & Climate Change
— Regulations

Summary of Parameters Comparing Anaerobic Food Waste Digestion to Anaerobic Municipal Solids Digestion
Parameter	Units	Food Waste Digestion				Municipal Wastewater Solids Digestion
		15-day Mean Cell Residence Time (MCRT)		10-day Mean Cell Residence Time (MCRT)		15-day Mean Cell Residence Time (MCRT)
		Mesophilic	Thermophilic	Mesophilic	Thermophilic	Mesophilic(1)
Volatile Solids (VS) (as percent of total solids (TS)), Feed	%	86.3	87	89.9	90.6	77
Volatile Solids Loading, Feed	lb/ft3-day	0.28	0.29	0.53	0.54	0.2 (2)
Chemical O2 Demand (COD) Loading, Feed	lb/ft3-day	0.55	0.57	1.09	1.11	0.06-0.03 (3)
Volatile Solids Destruction (VSD)	%	73.8	80.8	76.4	82.4	38-57% (4)
Methane (CH4) Content	%	64	67	59	60	63
Methane Production Rate, Avg (Range)	ft3/lb TS applied	13,300 (9,800-17,000)(5)		9,500 (6,600-14,400)(5)		10,000 (7,500-12,600)
Methane Production Rate, Avg (Range)	ft3 per day/1,000 ft3 digester volume	2,300 (1,100-3,200)		2,600 (1,800-3,800)		750 (550-930)
Residuals (Mass of Biosolids Produced) as a Percent of Feed Applied	%	36	30	31	26	56-70
Notes: 1. Based on data from previous EBMUD bench-scale pilot study. Digesters were fed thickened waste activated sludge and screened primary sludge. 2. Maximum recommended loading rate, WED MOP 8. 3. Maximum recommended loading rate, M&E, 4th edition. 4. EPA 503 Regulations minimum is 38%. Typical average is 57% from EBMUD bench-scale pilot study. 5. Data combined for mesophilic and thermophilic digesters.

Clean Energy & Climate Change— Regulations