From: From anaerobic to aerobic treatment: upcycling of digestate as a moisturizing agent for in-vessel composting process
The class of compost
AT4 (mg O2/g TS)
Product description
I
 > 40
Compost raw materials
II
28–40
Fresh compost
III
16–28
IV
6–16
Finished compost
V
 < 6