鸟粪石沉淀—光合细菌复合序批式生物膜反应器协同处理猪场沼液

Synergistic treatment of pig biogas slurry by struvite precipitation-photosynthetic bacteria composite SBBR

采用鸟粪石沉淀处理猪场沼液,出水再用光合细菌复合序批式生物膜反应器(SBBR)进一步处理,优化了鸟粪石沉淀的最佳Mg^(2+)∶NH_4^+(摩尔比)和光合细菌复合SBBR的最佳污泥停留时间(SRT)。结果表明:鸟粪石沉淀的最佳Mg^(2+)∶NH_4^+为1.3,COD、氨氮、TP和SS去除率分别可达52.86%、77.16%、83.24%、93.75%;光合细菌复合SBBR的最佳SRT为10d,运行第20天后基本达到稳定,COD、氨氮、TN和TP去除率分别达到87.19%~91.67%、90.18%~95.69%、82.79%~88.85%、74.81%~82.39%,稳定后鸟粪石沉淀—光合细菌复合SBBR对COD、氨氮、TN、TP的总去除率分别达到95.29%、98.39%、95.95%、96.95%以上。

The pig biogas slurry was treated by struvite precipitation-photosynthetic bacteria composite SBBR.The effects of Mg2+∶NH+4 in struvite precipitation and sludge retention time(SRT)in photosynthetic bacteria composite SBBR were analyzed.Results showed that the optimum Mg2+∶NH+4 was 1.3,and the optimum SRT was 10 d.The removal rates of COD,ammonia nitrogen,TP and SS were 52.86%,77.16%,83.24%and 93.75%in struvite precipitation,respectively.The photosynthetic bacteria composite SBBR tended to be stable after 20 d,and the removal rates of COD,ammonia nitrogen,TN and TP reached 87.19%-91.67%,90.18%-95.69%,82.79%-88.85%and 74.81%-82.39%,respectively.The total COD,ammonia nitrogen,TN and TP removal rates of struvite precipitation-photosynthetic bacteria composite SBBR were up to 95.29%,98.39%,95.95%and 96.95%,respectively.