Abstract:

Two groups of biofilm reactors were operated by continuous flow water inflow with elastic solid packing as carrier. Biofilms were acclimated by increasing influent load and decreasing C/N. The influence of 20 mg/L polyaluminum chloride（PAC） on biofilm performance and low C/N coal gasification wastewater treatment efficiency was investigated. By monitoring the removal efficiency of pollutants，it was found that the biofilms of R2 group with PAC and R1 group without PAC both had good impact load resistance and stable removal efficiency of organic matter. The total nitrogen removal rate of R2 group and R1 group were above 84% and 79.4%，respectively. The nitrogen removal performance was good，and PAC addition made the phosphorus removal effect reach above 98%. According to the data analysis，the addition of 20 mg/L PAC was beneficial to increase the biofilm biomass and promote the secretion of protein and polysaccharide in extracellular polymeric substances（EPS）. SEM and bacterial community analysis showed that PAC supplementation changed the microbial population structure and domesticated the dominant bacteria in nitrogen and phosphorus removal. The PAC coupled biofilm method had a good effect on the treatment of industrial coal gasification wastewater with low C/N through proper acclimation and cultivation，which had practical application potential.

Key words: biofilm, low C/N, coal gasification wastewater, nitrogen and phosphorus removal, PAC

摘要：

以弹性立体填料为载体、连续流进水方式运行两组生物膜反应器。通过不断提高进水负荷、降低C/N的方式驯化生物膜，探究投加20 mg/L聚合氯化铝（PAC）对生物膜性能及低C/N煤气化废水处理效果的影响。通过对污染物去除效能监测发现，未投加PAC的R1组和投加PAC的R2组两组生物膜耐冲击负荷能力良好，有机物去除效果稳定；后期稳定运行时R2组和R1组TN去除率分别达84%、79.4%以上，脱氮性能良好，且PAC的投加使除磷率达98%以上。由数据分析可知，20 mg/L PAC的投加有利于提高生物膜生物量、促进胞外聚合物（EPS）中蛋白、多糖的分泌；SEM及菌群分析发现PAC的投加改变了微生物种群结构、驯化了脱氮除磷优势菌种。通过合适的驯化培养，可以实现PAC耦合生物膜法对低C/N工业煤气化废水较好的处理效果，具有实际应用潜力。

关键词: 生物膜, 低碳氮比, 煤气化废水, 脱氮除磷, PAC

CLC Number: 

• X784

• X703