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Figure2. Cumulative biogas production

(1)

1)(.expmax)( maxmax

exp. tPeR

t PP

0

20

40

60

80

100

120

140

160

0 10 20 30 40 50

Time (days)

CumulativeLbiogas/KgST

R1 R2 GR1 GR2

System Rmax (ml d-1

ST-1) (d)

R1 0.98476 6.96

R2 1.0726 0.7975

Recirculation of liquid

fraction (leachate)

Biogas

composition

Biogas

production

Biogas

composition

Biogas

production

Monitoring of

liquid fraction

TS, VS

COD

N-NH3

pH

Alkalinity

VFAs

Monitoring of

liquid fraction

TS, VS

COD

N-NH3

pH

Alkalinity

VFAs

Solid fraction

(initial and final)

TS, VS

Solid fraction

(initial and final)

TS, VS

Solid fraction(Substrates

+straw)

Liquid fraction