四级三相式生物流化床分段进水工艺脱氮效能

对四级三相式生物流化床分段进水工艺脱氮效能进行了研究。通过改变进水C/N比、水力停留时间(HRT)和污泥回流比,考察了系统的脱氮效能,并与流化床A/O工艺脱氮效能进行对比。出水氨氮均小于1 mg/L,去除率保持在97%以上,TN去除率最高可达90%,出水水质均能够保证达标。在相同水质和运行条件下,将四级三相式生物流化床分段进水工艺与流化床A/O工艺进行对比,前者从脱氮效能和节约能源方面均表现出较强的优势。四级三相式生物流化床分段进水工艺无需外加碳源和内回流系统,是一种低碳节能的污水脱氮新工艺。

Nitrogen removal efficiency of three-phase biological fluidized bed with four step-feed process

This experiment mainly focused on the study of the nitrogen removal efficiency of the three-phase biological fluidized bed with four step-feed process. With different C/N ratios, HRT, and sludge return ratios, the effluent ammonia concentration was less than 1 mg/L and the removal rate was more than 97%. TN removal rate could reach up to 90%.The TN removal efficiency was higher than 90%. As a result, the effluent water quality could meet the national standard. Compared the three-phase biological fluidized bed with four step-feed process with the fluidized bed A/O process, the former one showed strong advantages in nitrogen removal performance and energy saving. Three-phase biological fluidized bed with four step-feed process has no need of external carbon source and internal recirculation system. A conclusion can be drawn that it is a low-carbon energy nitrogen removal process.