A series of high-temperature combined anaerobic digestion tests with different mass ratios were carried out using chicken manure and straw with a high C/N ratio as the raw materials. The changing trends of CODs, CODr, CODs/CODr and VFAs and the concentration of each component were analyzed during the high-temperature anaerobic digestion of chicken manure and straw using a sequencing batch reactor. The results showed that the CODT of the fermentation broth decreased significantly in the first 15 days, and the values of CODT decreased from 3584.45, 3132.28, 3355.45 and 2987.39 mg/L in the initial stage to 1756.28, 1532.45, 1607.28 and 1528.33 mg/L, respectively. The degradation rates of CODT15 were 51.06, 55.09, 52.11 and 48.84%, respectively. At the end of the reaction (50 d), the values of the four groups of CODT were 1223.10, 903.21, 1095.39 and 1333.46 mg/L, respectively. As the reaction proceeded to the seventh day, the maximum concentration, the VFAs of the digestive fluids from R1, R2, R3, and R7 were 3032.39, 3346.75, 3245.12 and 2794.03 mg/L, respectively. As the reaction completed, (50 d), the VFAs of the digestive fluids were 1558.34, 1547.37 and 1335.58 mg/L, respectively, in which the contents of formic acid, acetic acid, propionic acid, lactic acid, and butyric acid were 9.19-9.97%, 20.58-22.13%, 15.74- 18.44%, 22.86-25.50% and 25.56-30.02%, respectively.
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