Immobilization Composite Microbial Treatment Of Swine Wastewater Ammonia

At present, pig industry developed rapidly in China, piggery wastewater has became one of themost pollution sources, environmental problems also being more and more serious. Especiallyafter anaerobic treatment of piggery wastewater, C/N ratio is low, It is difficult to achieve an idealeffect by using the traditional processing method,and seek a new practical processing technique todeal with the piggery wastewater is urgent.In this study, based on ammonia nitrogen in high efficiency degradation piggerywastewater,which was separated and enriched in piggery wastewater, immobilized mixedmicroorganisms for treating the piggery wastewater.Immobilized mixed microorganisms by polyvinyl alcohol (PVA), sodium alginate (SA) andsand. The best conditions of immobilized mixed microorganisms are:PVA9%, SA0.7%, sand2.0%, mixed microorganisms20%,respectly. linking forming liquid was saturated boric acidcontaining1.5%CaCl2and adjustable pH to6.7, operating temperature43℃, linking time24h.The best treatment conditions of immobilized mixed microorganisms: aeration and noneaeration1h/1h, aeration strength6～7mg/L, immobilized ball quantity is20%(v/v), pH7~8,temperature25～30℃. When ammonia nitrogen concentration in piggery wasterwater is755mg/L, aeration ten days under the condition of1~8℃,the removal efficiencies of ammonianitrogen by immobilizing mixed microorganisms reach to64.8%, hihger by20.5%than freemixed microorganisms.In this lab, comparing immobilized mixed microorganisms with free immobilized mixedmicroorganisms of the removal efficiency of ammonia nitrogen in the same piggerywastewater.It is show to that: the removal efficiency of ammonia nitrogen in piggery wastewaterby immobilized mixed microorganisms significantly higher than free mixed microorganisms.