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Table 5 Classification of the compost samples according to German standards based on AT4 analysis

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

Fresh compost

IV

6–16

Finished compost

V

 < 6

Finished compost