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Table 2 Operating conditions of control- and in situ upgrading reactors at different experimental phases

From: Impact of operational conditions on methane yield and microbial community composition during biological methanation in in situ and hybrid reactor systems

Parameters

Unit

Phases

I (day 1–64)

II (day 65–78)

III (day 79–85)

IV (day 93–113)

V (day 114–140)

VI (day 141–172)

CR

UR

CR

UR

CR

UR

CR

UR

CR

UR

CR

UR

Stirring speed

rpm

80

80

80

80

140

140

80

80

80

80

80

80

CM:CW ratio

%

10

10

10

10

10

10

20

20

10

10

10

10

Feeding frequency

hours

24

24

24

24

24

24

24

24

48

48

24

24

H2:CO2 ratio

–

–

–

–

2

–

2

–

2

–

2

–

4

  1. Day 86–92—same conditions as phase II
  2. CR control reactor; UR in situ upgrading reactor; CM cow manure; CW cheese waste