Research on the removal of dissolved organic matter in runoff stormwater by biochar
Amounts of dissolved organic matter(DOM)in stormwater would enter natural wa-ter through urban stormwater drainage systems.Excessive DOM can cause aesthetic concerns such as black and stink water with unpleasant colors and odors,water eutrophication,and it can act as the precursors of hazardous disinfection byproducts(DBPs).In this study,biochar was used as ab-sorbent to investigate the adsorption effect on DOM in stormwater.The results revealed that bam-boo biochar showed excellent adsorption effects on DOM.Moreover,KZC,modified by KOH,had the best adsorption performance,and the removal efficiencies of dissolved organic carbon(DOC)and dissolved organic nitrogen(DON)were 63.1％and 79.9％respectively,and the removal effi-ciency of total DBP FPs was up to 63.2％.Additionally,the results of EEM showed that the DOM components of runoff rainwater were complex,and the intensity of humic acid-like,fulvic acid-like,soluble microbial product-like substances,and aromatic proteins were very high.Particular-ly,after the bamboo biochar adsorption treatment,the intensity of aromatic proteins and humic acid-like decreased significantly,which was the key to reduce DBPs precursors.The adsorption mechanism of modified biochar included pore filling,hydrogen bonding,hydrophobic interaction and π-π interaction.In general,bamboo biochar has considerable application potential in rapidly controlling runoff stormwater pollution.
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