Skip to main content

Table 1 Process parameters and operating conditions in the digesters operating with and without trace element addition at 37 and 42 °C

From: Trace element and temperature effects on microbial communities and links to biogas digester performance at high ammonia levels

Digester

Operating parameters

NH4 +-N (g/L)

NH3 (g/L)

14CO2/14CH4 ratio

Average pH

Temperature (°C)

Trace element addition

D37

37

–

5.8

0.4–0.7

9.1 ± 2.4

7.9 ± 0.1

D42

42

–

5.6

0.6–1.5

20 ± 1.8

8.1 ± 0.2

DTE37

37

+

5.4

0.6–0.9

21 ± 5.1

8.1 ± 0.1

DTE42

42

+

5.4

0.8–1.2

14 ± 1.7

8.1 ± 0.1

  1. pH was measured weekly and ammonium-nitrogen (NH4 +-N) was measured during period 2