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

Table 1

Operating conditions of selected anaerobic digestion facilities.

Types of feed waste	Individual anaerobic digestion facility	Mixing ratio	(°C)	Types of system
Food waste leachate (FWL)	FWL1	1	55	2
	FWL2	1	35	2
	FWL3	1	35	—
	FWL4	1	35	1
	FWL5	1	35	—
	FWL6	1	55	1
	FWL7	1	55	—
	FWL8	1	—	2
Animal manure + food waste leachate (A-MIX)	A-MIX1	3 : 1^†	35	1
	A-MIX2	7 : 3	55	1
	A-MIX3	—	35	2
Sewage sludge + food waste leachate (S-MIX)	S-MIX1	3 : 2^‡	55	1
	S-MIX2	13 : 1	35	1
	S-MIX3	4.5 : 1	35	2
	S-MIX4	4 : 1	35	1
	S-MIX5	50 : 1	55, 35	1
	S-MIX6	6.7 : 1	35	1

Ratio = feed ratio into anaerobic digester. ^†Animal manure: food waste leachate for A-MIX, ^‡sewage sludge: food waste leachate for S-MIX.
1: single stage system; 2: two-stage system.
—: unknown data.