低温是造成寒冷地区冬季生活污水生化处理效果差的主要原因。当温度降低至4℃左右时，活性污泥中大多数微生物的生长活性受到抑制，只有少数的耐冷微生物可以存活下来并保持一定的活性。本课题组以往的研究结果证明：在我国北方地区，完全可以分离到在低温下高效降解污水中有机物的耐冷细菌。通过投加耐冷菌可使污水的去除效率大大提高。但由于投加的耐冷菌的流失等原因，必须隔一定时间再次投菌，既费时费力，又增加投资。%low temperature is the main cause of cold region in winter , sewage biochemical treatment effect is poor .When the tempera-ture is reduced to about 4 ℃, most of the growth activity of activated sludge microorganism is suppressed , only cold tolerant microbes can survive and maintain a certain activity .Our past study results show that:in the northern area of our country , can be completely isolated in low temperature high degradation of organic matter in the sewage of psychrotrophic bacteria .Through the investment plus resistance to cold bacteria can make sewage removal efficiency is greatly improved .But due to adding Psychrotroph loss , must every time once again cast bac-teria, time-consuming and laborious , but also increase the investment .
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