有機性濃厚廃液の燃焼処理

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In recent years two new method for the treatment of sewage sludge and organic industrial wastes that approaches disposal have been developed. They are commonly known as the Atomized Suspension Technique and the Zimmermann Process.The present investigation was undertaken to study the burning characteristics of sewage sludge, night-soil and some industrial wastes, and to learn if both the above processes could be applied to sludge and some other wastes in Japan.The results were as follows ;1) The mean calorific values of primary sludge, excess activated sludge and digested sludge from sewage treatment plant was 119,36 and 118 kcal/kg of wer matter, respectively without any process for removing a portion of the water.The organic matter of each sludge would not be fully oxidized itself by wet air combustion without the addition of other fuel.2) When each kind of sludge was settled for 24 hrs, the sludge was thickned to have more than 150 kcal and would be burnt by the Zimmermann process without addition of other fuel.3) The mean calorific values of night-soil was 82 kcal and the concentrated night-soil after settling had more than 400 kcal.4) The correlation between the volatile matter and the calorific values of various sludges and night-soil was significant at high level so that the calorific values of various sludges and night-soil could be assumed by the following formula.Calorific values kcal/kg of wet matter=volatile matter (%) of sludge or night-soil×60.There was also a close correlation between volatile matter and air requirement (C O D by K_2Cr_2O_7).5) Concerning the calorific values of pulp wastes, S. P. was 453,K. P. was 653 kcal and both were discharged at high temperature so that much excess energy would be produced by wet air combustion and meet one half of the total energy requirement of the pupl plant.6) The calorific values of whisky, alcohol and malt wastes was 231,339 and 955kcal/kg of wet matter, respectively. When equivalent discharge mixtures of both whisky and malt wastets were burnt by the Zimmermann process, produced energy would meet all energy requirements of the distilling apparatus.7) Spent liquor of cooked soybean in miso (fermented soy bean paste) factory contained 289kcal and phthalic anhydride waste before recovery of some organic acids had 1224kcal. Both wastes would be able to meet more than the energy requirements of the plant.
社団法人日本生物工学会の論文
1964-02-15

有機性濃厚廃液の燃焼処理

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