TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The combustible is in pulverized form (preferably coal).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The modified bio-slurry (S1) comprises the pyrolysis condensate (1-99, preferably 20-90) wt.%; the combustible that does not originate from pyrolysis of biomass (1-80, preferably 10-70) wt.%; and optionally water and/or at least one additive. The pyrolysis condensate originates from pyrolysis of biomass. Preferred Process: The process (P1) for gasification of the modified bio-slurry (S1) further involves prior to or after the gasification of the modified bio-slurry; gasification of a bio-slurry, gasification of a coal-slurry, and/or gasification of a second modified bio-slurry, which has a different composition compared to the modified-bio-slurry, in the gasifier. In the process (P2), the combustible is added in form of slurry including the combustible, where slurry including the combustible is preferably a coal-slurry. The process (P2) further involves measuring with at least one sensor the composition and/or heating value of the pyrolysis condensate, and/or the composition of the bio-slurry before and/or after the combustible is added to the bio-slurry; and measuring with at least one sensor the water content of the pyrolysis condensate and/or the water content of the bio-slurry before and/or after the combustible is added to the bio-slurry. In the process (P2) the amount of added combustible is regulated depending on the measured composition of the pyrolysis condensate, and/or the composition of the bio-slurry before and/or after the combustible is added to the bio-slurry. The process (P2) further involves the regulation of the water content of the slurry including the combustible before adding the slurry to the bio-slurry dependent on the measured composition of the pyrolysis condensate, and/or the composition of the bio-slurry and/or the water content of the bio-slurry. EXAMPLE - No suitable example given.