Alkaline lake bacillus strain W30, denitrification microbial inoculum as well as preparation method and application of denitrification microbial inoculum

The invention provides an Alkaline lake bacillus strain W30, a denitrification microbial agent and a preparation method and application of the Alkaline lake bacillus strain W30 and the denitrification microbial agent. The preservation number of the Alkaline lake bacillus strain W30 is CGMCC NO.23484, and the denitrification microbial agent is prepared from the Alkaline lake bacillus strain W30 with the preservation number of CGMCC NO.23484. The Alkaline lake bacillus strain W30 is a heterotrophic nitrification aerobic denitrification bacterium, can perform assimilation and denitrification nitrogen removal by taking sodium citrate as a carbon source and nitrate nitrogen or nitrite nitrogen as a nitrogen source under an aerobic condition, or can perform denitrification nitrogen removal by taking sodium citrate as a carbon source and ammonia nitrogen as a nitrogen source under an aerobic condition. According to the present invention, the membrane bioreactor effluent water is subjected to nitrogen removal through