Temperature-resistant composite bacterial liquid for degrading COD (Chemical Oxygen Demand) as well as preparation method and application thereof

The invention relates to the technical field of wastewater treatment, in particular to a temperature-resistant composite bacterial liquid for degrading COD (Chemical Oxygen Demand) as well as a preparation method and application of the temperature-resistant composite bacterial liquid. The preparation method comprises the steps of strain activation, shake-flask culture, fermentation culture and compound filling. The used bacillus siamensis, bacillus adhattai, bacillus pumilus and bacillus megatherium are bacterial strains capable of efficiently degrading COD (Chemical Oxygen Demand) aiming at different water qualities, and the compost bacillus COD3-7 obtained by self-separation can grow under the condition of 5-45 DEG C, and can be compounded with other bacterial strains for use, so that the tolerance temperature of the other bacterial strains can be improved. When the wastewater treatment temperature is high, the prepared temperature-resistant composite bacterial liquid for degrading COD still keeps high acti