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Mabie Farm Park - Biomass

According to the methodology, the analysis is divided into 2 parts: Anaerobic Digestion and Biomass Boiler.

Energy from anaerobic digestion process

At Mabie farm, there is no anaerobic digester used to convert their waste and residue into energy. So there is an opportunity to use these available sources for supplying anaerobic digestion technology. These sources can be divided into 3 parts: animal waste, agricultural waste and food waste.

The main purpose of Mabie farm is to serve visitors as a recreation place with lots of activities that families can enjoy together in the summer or at weekends. Therefore, the livestock is only used for show to their visitors, not for selling or supplying food. There are various animals in the farm but the total number of animals is not enough for using their waste as a biomass supply source. This is the same for agricultural waste. The only product from their agriculture is hay, all of which is used as animal food.

The only possibility for Mabie farm is to use food waste from the kitchen and from food that is left by their visitors. However, waste generated by visitors is not constant during the year - it varies with the number of visitors. The estimation of the visitors at Mabie Farm Park and the solid waste generated is shown in table 1:

Table 1. Number of Visitors and Soid Waste Estimation

Month	Visitors	Waste	Waste	Biogas generated	Energy Output	Energy Output
	(people/wk)	(kg/wk)	(kg/d)	(m3/d)	(kcal)	kWh
Jan	50	25	3.6	0.12	660	0.8
Feb	150	75	10.7	0.36	1980	2.3
Mar	250	125	17.9	0.60	3300	3.8
Apr	500	250	35.7	1.20	6600	7.7
May	1000	500	71.4	2.40	13200	15.4
Jun	2500	1250	178.6	6.00	33000	38.4
July	2500	1250	178.6	6.00	33000	38.4
Aug	2000	1000	142.9	4.80	26400	30.7
Sep	1000	500	71.4	2.40	13200	15.4
Oct	250	125	17.9	0.60	3300	3.8
Nov	50	25	3.6	0.12	660	0.8
Dec	50	25	3.6	0.12	660	0.8

Assumption

Waste Generation Rate 0.5 kg/person/day
Organic Matter Fraction 60%
specific gas production 0.4 m³/kgTVS/d
TS (Total Solid) 20%
VS (Volatile Solid) 70%
Energy from Biogas 5500 kCal/m³

The Estimated energy output varies during the year. This cannot match the energy demand of Mabie farm; therefore it is not practical for using the anaerobic digestion system in this case.