Very important parameter monitored during
cotreatment of leachate and synthetic wastewater
was biogas yield. At the longer HRT of 7 d and
5 d, the biogas yield was on the same level
(0.3 dm3biogas/gCODremover × d) whereas the
highest value achieved at HRT of 2 d
(0.45 dm3biogas/gCODremover × d). Relationship
between COD removal efficiency, daily biogas
production and hydraulic retention time was presented
on Fig. 5.