余剰汚泥の嫌気性分解時の成分変化に関する研究

抄録

The anaerobic decomposition of sludge wasinvestigated. With the decrease of ORP, pH increased and MLSS decreased. BOD value ofsupernatant was larger than COD value, butthe ratio of both values was not constant. Acetic and propionic acids were detected in alarge amount as volatile organic acids, and the ratio of volatile acids to BOD values was not constant. As N compounds, NH₃-N wasmuch, but NO₂ and NO₃-N were containedalittle. N content in dry sludge was 6.46% and corresponded to 40% as protein content. As Pcompounds, orthophosphate from was much and organic form was a little. P content in dry sludge was 0.373%. As sulfides in sludge, comined form was much and free form was a little, while a largeamount of sulfate-S was contained in filtrate. For gas production by unacclimatized sludge, the large production periods were observed at four times. CH₄ and N₂ were much, while H₂ and H₂S were a little. If digested sludge was mixed, the gas production decreased andand only one production period was observed.