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Climate Change Contacts

Pacific Southwest, Region 9

Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations

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)
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.

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