U ovom radu provedena je biološka obrada agroindustrijskog otpada (P1), biootpada (P2) i biorazgradljivog komunalnog otpada (P3) procesom kompostiranja u adijabatskom reaktoru tijekom 21 dana. U pokusima P1, P2 i P3 postignuta je maksimalna temperatura od 52, 55 i 57 °C, a termofilna faza je trajala 8, 5 i 6 dana. Ukupno je nastalo 122, 407 i 389 g kgHT0–1 CO2 odnosno 89, 148 i 559 mg kgHT0–1 NH3. pH-vrijednost je na početku procesa bila u neutralnom području, a na kraju u blago lužnatom području. Vlažnost supstrata se povećala za oko 5 %, dok se omjer C/N smanjivao uslijed smanjenja udjela organskog C te povećanja udjela N. Shodno navedenom, postignuta je konverzija od 48 %, 71 % odnosno 56 % u pokusima P1, P2 i P3.; The aim of this work was biological treatment of agroindustrial waste (P1), biowaste (P2) and biodegradable municipal solid waste (P3) by the composting process in adiabatic reactor during 21 days. In experiments P1, P2, and P3, a maximum temperature of 52, 55, and 57 °C was reached, and the thermophilic phase lasted 8, 5, and 6 days. The cumulative evolved CO2 and NH3 was 122, 407, and 389 g kgVM0−1 and 89, 148, and 559 mg kgVM0−1, respectively. The pH value at the beginning of the process was in the neutral and at the end in the slightly alkaline domain. The substrate humidity increased by about 5 %, while the C/N ratio decreased due to a decrease in the organic C content and an increase in N content. Consequently, a conversion of 48 %, 71 %, and 56 %, respectively, was achieved in experiments P1, P2, and P3.