Affiliations: Guangzhou Environment Protection Bureau, Guangzhou
510032, China | Guangzhou Research Institute of Environmental
Protection, Guangzhou 510620, China | South China Botanical Garden, Chinese Academy of
Sciences, Gu angzhou 510650, China
Abstract: 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, NO_3^--N,
NO_2^--N, NH_4^+-N and
pO_4^{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, NO_3^--N,
NO_2^--N, NH_4^+-N and
PO_4^{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.
