The Influence of Dissolved Oxygen and Carbon Source on the Nitrogen Removal Performance of Landfill Sludge Dewatering Fluid
GONG Xiaolu
WANG Junjie
Abstract：The"pretreatment+two-stage AO+membrane bioreactor"process was used to treat landfill sludge dewatering fluid.The influence of dissolved oxygen and external carbon source types on the nitrogen removal performance was in-vestigated in situ.During stable operation,the effluent NH4+-N concentration was(52.11±8.60)mg/L,the effluent NO2--N concentration was(28.23±5.09)mg/L,the effluent NO3--N concentration was(25.57±4.43)mg/L,the nitrogen remov-al efficiency was 88.10％±1.20％,and the nitrogen removal load was 0.02 kg/(kg VSS·d).Low dissolved oxygen concentra-tion(1～1.5 mg/L)is more conducive to partial nitrification compared to high dissolved oxygen concentration(2～3 mg/L),enhancing the partial nitrification-denitrification nitrogen removal pathway.However,low dissolved oxygen concentra-tion and reduced stirring intensity caused by reducing aeration intensity will lead to a decrease in biochemical reaction rates.Comparing to use acetate as a carbon source,using a composite carbon source of leachate and acetate can improve denitri-fication efficiency,with the nitrogen removal efficiency increasing from 83.18％±1.26％to 88.10％±1.20％,and reduce the cost of agents for treating landfill sludge dewatering fluid.
Keywords：landfill sludge dewatering fluidnitrogen removaldissolved oxygencarbon sourcewastewater utilization
Publication Date：2024-12-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 147-151 )