Thus, future work should be focused on avoiding VFA inhibition and improving the stability of the digester systems when KW is added as a co-substrate. This could be feasible via the following two methods: (1) changing the single-stage anaerobic digestion system to a two-stage anaerobic digestion system; (2) reducing the loading rates and using on-line VFA concentration.
monitoring to ensure that the VFA concentration is maintained in the desired range.