Furthermore, previous report
showed methane yield in SS-AD decreased by about 60% when
TS increased from 20% to 30% (Yang et al., 2015). Excessive TS loading
could result in rapid hydrolysis as well as overproduction of
VFAs and thus reduce the process stability of SS-AD digesters (Li
et al., 2011). Nevertheless, proper TS loading were also necessary
for SS-AD process, as TS overloading could delay the start-up of
the digestion and thus affect the performance of the SS-AD process
(Yan et al., 2015).