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).