Nitrogen removal from low-C/N-wastewater using immobilized algal-bacteria on composite carriers strength-ened by hydraulic retention time
Chlorella vulgaris and activated sludge were immobilized using green zeolite and corncob as composite carriers to explore a new method for removing nitrogen from wastewater with low C/N.We investigated the denitrification capacity of immobilized algae-bacteria system(IABS)and hydraulic retention time(HRT)on denitrification efficiency.The composite carrier effectively optimized the C/N of wastewater,and the constructed immobilized algae-bacteria system effectively removed nitrogen from wastewater with low C/N.The denitrification effect of the device increased with longer HRT.With an HRT of 18 h,the removal rate of TN and NH+4-N reached up to 98%and 100%,respectively.The immobilized algae-bacteria system constructed by the composite carrier of green zeolite and corncob efficiently removes nitrogen without needing to continuously add a carbon source and has stable effluent quality.
wastewater with low C/Nimmobilized algae-bacterianitrogen removal
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