Study on the process of aerobic-anaerobic coupling for dairy farm sewage
[Objective]To screen the microorganism that degrades the dariy manure sewage in the hope of providing the scientific basis for the dairy manure treatment.[Methods]The microbial strains that were repor-ted using to degrade sewage and determine the values of COD(chemical oxygen demand),BOD5(biological ox-ygen demang 5 days),TP(total phosphorus)and pH after processing the dairy farm sewage by microorganisms were selected.[Results]Three strains of aerobic bacteria were screened from the reported beneficial microor-ganisms that could be used for the treatment of dairy farm sewage,which were Bacillus subtilis,Bacillus megate-rium and Bacillus mucilaginous;There were 3 strains of anaerobes,including Rhodopseudomonas palustris,Pseudomonas fluorescens and Seratia marcescens.The best technological conditions for the treatment of dairy farm sewage by the aerobic-anaerobic coupling method were established:5%inoculum,0.05 m3/h aeration(2 h aeration every 10 h),30℃and 96 h treatment time.[Conclusion]The removal rate of COD,BOD5 and TP in the dairy farm sewage is91.38%,96.82%and82.6%,respectively,and the effluent pH is7.2-7.6,which conforms to the national standard for farmland irrigation water.
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