Effect of Volatile Fatty Acid Concentration on Anaerobic Degradation Rate from Field Anaerobic Digestion Facilities Treating Food Waste Leachate in South Korea

Table 2

Physicochemical characteristics of feed waste.

Parameters	Types of feed waste
	Unit	FWL	A-MIX	S-MIX
Moisture content	%	92.8 (2.9)	95.4 (0.5)	95.0 (2.1)
Volatile solid	%	5.5 (3.0)	3.3 (0.3)	3.5 (1.8)
Total solids	%	7.2 (2.9)	4.6 (0.5)	5.0 (2.1)
Volatile solid/total solids	%	71.0 (15.1)	72.0 (1.1)	71.5 (9.5)
T-N	mg/L	3,190.5 (953.0)	4,744.0 (5,260.0)	4,914.4 (2,406.0)
NH3-N	mg/L	686.7 (749.3)	777.1 (979.9)	98.8 (372.0)
Total volatile fatty acid	mg/L	12,420.0 (9,878.9)	9,115.0 (2,957.5)	3,679.5 (4.6)

Mean values of 17 selected facilities and standard deviation in parentheses.
( = 8 for FWL, = 3 for A-MIX, and = 6 for S-MIX.)
Volatile solid/total solids = [Volatile solid/(Volatile solid + Fixed solid)] × 100.