文档介绍：The effect of temperature and internal recycle ratio
on the mass flow in A2/O system
DONG Xiao-yang, WU Shan ZHANG Jing-hui, ZHOU Jun
Civil Engineering College Research and development Center
Beijing University of Technology Beijing drainage group co., LTD
Beijing, China Beijing, China
Abstract—The mass balance of COD、N and P in the wastewater TABLE 1 Basic data and operational parameter in testing
treatment process was studied respectively on a trial basis by a pilot- A2/O system
scale A2/O system. Under three kinds of operating conditions which
Volume of anaerobic DO of anaerobic
2 m3 ≤ mg/L
with different temperature (14℃, 18℃, 21℃) and mixed liquor tank V1 tank
internal recycle ratio (100%, 200%, and 300%), the flow and Volume of anoxic ~
3 m3 DO of anoxic tank
distribution of COD 、 N and P in the system were tested and tank V2
analyzed. The variation of these three indexes in anaerobic, anoxic Volume of oxic tank 2 ~ 3
4 m3 DO of oxic tank
and aerobic phases of the treatment process can be directly V3 mg/L
represented by the experiment results, and it will give real support to internal recycle 100 ~
external recycle ratio 100 %
optimizing the running condition of A2/O system. ratio 300 %
Sludge discharge
Sludge age 10 d m3/d
Keywords-A2/O, mass flow, mass balance, temperature, internal