Abstract: There is disclosed a heater which does not excessively heat a lubricating fluid but can rapidly raise a temperature of the lubricating fluid, even when a size thereof is small. A heater includes a honeycomb structure section including partition walls which contain a ceramic as a main component and generate heat by electrical conduction, and a plurality of cells which are partitioned and formed by the partition walls and extend through the honeycomb structure section from one end to another end to become through channels of a lubricating fluid; and a pair of electrodes which become an anode and a cathode to come in contact with the honeycomb structure section, thereby conducting the electricity through the partition walls of the honeycomb structure section.

Abstract: There is disclosed a heater which does not excessively heat a lubricating fluid but can rapidly raise a temperature of the lubricating fluid, even when a size thereof is small. A heater 1 includes a honeycomb structure section 6 including partition walls 7 which contain a ceramic as a main component and generate heat by electrical conduction, and a plurality of cells 5 which are partitioned and formed by the partition walls 7 and extend through the honeycomb structure section from one end 9a to another end 9b to become through channels of a lubricating fluid; and a pair of electrodes 4 which become an anode 4a and a cathode 4b to come in contact with the honeycomb structure section 6, thereby conducting the electricity through the partition walls 7 of the honeycomb structure section 6.

Abstract: A method for treating an organic sludge is provided which can sufficiently and efficiently solubilize an organic sludge to afford a high load of anaerobic digestion treatment with an improved digestion ratio and methane gas recovery amount thereby to widely decrease the amount of the organic sludge discharged from the method. The method includes a hot alkaline treatment for causing the organic sludge to become alkaline while maintaining the temperature of the sludge to ambient -100.degree. C. to solubilize organic matters in the sludge, and an anaerobic digestion treatment of anaerobically digesting the organic sludge after the hot alkaline treatment at a temperature of 20.degree.-60.degree. C. at a pH of 7.3-9.2.