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    • 16. 发明申请
    • METHOD OF ANAEROBIC DIGESTION OF SEWAGE SLUDGE
    • 沥青混合料污水的方法
    • WO1995018073A1
    • 1995-07-06
    • PCT/JP1994002238
    • 1994-12-26
    • HITACHI ZOSEN CORPORATIONKOBAYASHI, YoshioAKITA, Minoru
    • HITACHI ZOSEN CORPORATION
    • C02F11/04
    • C02F11/04Y02E50/343Y02W10/40
    • A method of anaerobic digestion of sewage sludge, comprising the steps of dewatering surplus sludge to make dewatered sludge (10 to 25 wt. %) after subjecting the surplus sludge to preliminary heat treatment at 60 DEG C or higher, mixing the dewatered sludge with digestion sludge which is extracted from a methane fermentation vessel of dewatered sludge, supplying the resulting mixture to the methane fermentation vessel of dewatered sludge while discarding digestion sludge equivalent in amount to the dewatered sludge supplied. The sewage sludge containing a large quantity of surplus sludge is subjected to preliminary heat treatment, and then the heat treated sludge is dewatered to permit a nitrogenous component to be transferred to eliminated water whereby the nitrogenous component in the dewatered sludge can be reduced. The resulting dewatered sludge can stably undergo methane fermentation even at a high concentration of 10 to 25 wt. %.
    • 一种污水污泥的厌氧消化方法,其特征在于,在多余的污泥经过60℃以上的预热处理后,将多余的污泥脱水,脱水后的污泥(10〜25重量%)的步骤,将脱水后的污泥与消化 从脱水污泥的甲烷发酵容器中提取的污泥,将所得混合物供给脱水污泥的甲烷发酵容器,同时废弃与提供的脱水污泥相当的消化污泥。 将含有大量剩余污泥的污水污泥进行预热处理,然后将热处理后的污泥脱水,使含氮成分转移到排出的水中,由此可以减少脱水污泥中的含氮成分。 所得到的脱水污泥即使在10〜25重量%的高浓度下也能稳定地进行甲烷发酵。 %。