The experimental apparatus consisted of two glass bottles and
one plastic vessel connected by pipes. In the first bottle (1000 mL),
550 g of a mixture of OP and OMW (165 g of OP and 385 of OMW)
was added in an approximate ratio of 1:2 to obtain a TS concentration
of approximately 10% w/w in the reaction medium (NPbh,
non pretreated mixture before the hydrolysis stage).