Comparison of Pure MBBR and Activated Sludge for High Standard Denitrification of Waste water
A high concentration sewage treatment plant in north China with design treatment capacity of 12×10 4 m3/d,was constructed in two phases.The core processes are activated sludge system and biofilm system,respectively.The application of two different systems and the difference of denitrification effect were analyzed from the aspects of operation effect,process mechanism,and operation regulation.From the perspective of operation effect,the nitrogen removal capacity of the biofilm system is stronger.The effluent NH3-N and TN of the biological tank reach(0.45±0.37)mg/L and(3.79±0.81)mg/L,respectively.The nitrification and denitrification load of the biofilm system is 2.73 and 1.52 times that of the activated sludge system,respectively.The per ton water occupation of the biofilm system biochemical section is only 35.08％of the activated sludge system,achieving intensive construction and improving the antishock load capacity.From the perspective of process mechanism,the absolute biomass of nitrifying and denitrifying bacteria in the biofilm system is 20.68 and 1.53 times that of the activated sludge system,respectively,which is the internal reason for the improvement of biochemical efficiency.From the perspective of operation regulation,activated sludge should focus on sludge morphology and operating environment,while biofilm method does not enrich activated sludge,but should ensure good mass and oxygen transfer effect and stability of structural equipment.
NETL
NSTL
万方数据
