【摘要】 文章主要研究了因温度降低而引起的高温厌氧颗粒污泥活性变化，观察其耐热性，以及污泥在不同底物、不同温度、不同ｐＨ条件下的产甲烷活性。结果表明，高温厌氧颗粒污泥在一定温度范围（４５℃～５５℃）内，具有较强活性。当底物中含糖类时，低温（４５℃以下）能引起丙酸盐积累，消化器酸化，污泥失活。高温厌氧颗粒污泥的最适温度为５５℃，最适ｐＨ为６．５。更多还原

【Abstract】 The thermotolerance of thermophilic sludge adopt at 55℃ was tested when the temperature decreases. Its methanogenic activity and the removal efficiency of COD, VFA are also measured under different substrates and pH. The results show that the sludge is thermotolerantable in certain temperature range of 45℃ to 55℃. When sucrose is used as substrate under low temperature, the propionic acid will accumulate in the UASB reactors and the methanogenic activity of the sludge will decrease. The highest methanogenic activity is obtained at a pH around 6.5. The opti@mum temperature is 55.更多还原