Co-migration behavior between colloids and dissolved organic matter from urban surface runoff
Aiming at the coexistence of colloids and dissolved organic matter(DOM)from urban surface runoff,the concentrations of runoff colloids and DOM in effluent from the infiltration column were investigated.Besides,the influence of water flow velocity,pH values,Na+concentration and particle size of colloids on the co-migration behavior between colloids and dissolved organic matter were analyzed.The results showed that the combination between runoff colloids and DOM significantly promoted their downward migration.The concentrations of runoff colloid and DOM in effluent were much higher when the influent velocity was higher.Compared to the influent velocity of 5 mL·min-1,the relative peak concentrations of the colloids and DOM in effluent were increased by 3.5％and 8.1％under the condition of the influent velocity of 10 mL·min-1,respectively.The co-migration speed of the runoff colloids and DOM was the fastest at pH value of 6.The downward co-migration of runoff colloids and DOM was inhibited by the presence of Na+.The smaller the particle size of coexisting runoff colloids,the earlier the outflow time of DOM and the lower the peak concentration of DOM in effluent.
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