Liquid phase oxidation of cumene in the absence of solvent was carried out in a bubble column in temperature range from IOO°to I3O°C. The reaction scheme in the batch-wise operation was classified in terms of three periods: the induction, the steady chain-propagation and the termination periods.The kinetics in the steady chain-propagation period, which is industrially important, was studied and the rate expressions of chemical steps were derived.

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The behavior of suspended solid particles in the bubble column was experimentally studied.

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Dewatered sewage sludge was composted in a laboratory-scale autothermal reactor in which a constant temperature of 60°C was kept as long as possible by regulating the air feed rate. The change in CO2 evolution rate was measured continuously from the start up through the cessation of composting. The succession of mesophilic bacteria, thermophilic bacteria, and thermophilic actinomycetes was also observed during the composting. Specific CO2 evolution rates of thermophilic bacteria and actinomycetes in the constant-temperature region of 60°C were assessed quantitatively. It was found that the CO2 evolution rate was attributed to thermophilic bacteria at the initial stage of 60°C and to thermophilic actinomycetes at the later stage of 60°C.