Interaction effect of micro- and macro-organic on the biogeochemical function of the sediment and aquatic interface.
Constructed stormwater infiltration basins have been broad applied in urban areas in terms of stormwater disposal and compensation of reduced groundwater recharge. However, stormwater derived from sediments accumulating in infiltration beds may act as a source of dissolved contaminants for groundwater. Concentrations of DO, NO3(-)-N, NO2(-)-N, NH4(+)-N and PO4(3-)-P were monitored at multiple depth with time. The results showed that the occurrence of denitrificarion was restrained by sediments in term of no invertebrates. Under the conditions of invertebrates inoculated, the concentrations of DO, NO3(-)-N, NO2(-)-N, NH4(+)-N and PO4(3-)-P varied respectively with time and the occurrence of nitrification and mobilizing nitrate in the sediment. It is concluded that there exist the invertebrate activities such as building tubes and galleries and excreting faecal pellet which may increase water dispersion and enhance accessibility of nutrient, and stimulate microbial process effected in the sediment. Besides, the natural death and rot of worms were also found to be important factors of the invertebrate activities.
Xiao
Xiang
X
Guangzhou Environment Protection Bureau, Guangzhou 510032, China. xiaoxiang762@hotmail.com
Liao
Ling
L
Zhang
Xin-Hua
XH
D000818:Animals; D002683:Chironomidae / Q000737:chemistry*; D004785:Environmental Pollutants / Q000032:analysis*; D005618:Fresh Water / Q000737:chemistry*; D019015:Geologic Sediments / Q000032:analysis*; D007814:Larva / Q000737:chemistry; D017672:Nitrogen Compounds / Q000032:analysis*; D009835:Oligochaeta / Q000737:chemistry*; D010100:Oxygen / Q000032:analysis; D010710:Phosphates / Q000032:analysis; D011891:Rain
D004785:Environmental Pollutants; D017672:Nitrogen Compounds; D010710:Phosphates; D010100:Oxygen