To investigate the mechanism of submerged macrophyte–bacteria interactions on the removal of phthalic
acid esters from surface water, experiments with and without Potamogeton crispus L. were performed. A
two-compartment (i.e., water and plant) kinetic model was developed. The model adequately described
the variation of dibutyl phthalate (DBP) and di-2-ethylhexyl phthalate (DEHP) in the plant-water system
by providing the first-order rate constants of plant uptake (k1) and release (k2), microbial degradation in
water (k3) and plant degradation (k4). During 10-d incubation, the presence of P. crispus enhanced the
removal of DBP and DEHP from water by 6.3% and 22.4%. Compared with the experiment without
P. crispus, biodegradation of DBP in water with P. crispus decreased by 8.3% because of plant uptake even
though k3 increased by 30%. 21.4% of DBP transferred from water to plants, of which only small amount
(5.1%) retained in the plant and the rest (94.9%) was degraded. Different from DBP, biodegradation of
DEHP in water with P. crispus was a slightly higher than that without P. crispus. 25.5% of DEHP transferred
from water to plants, of which a large portion (73.3%) retained in the plant and the rest (26.7%) was
degraded. This finding reveals that the enhancement of DBP removal from surface water is mainly related
to faster degradation in the plant, whereas it is mainly related to higher plant accumulation for DEHP
To investigate the mechanism of submerged macrophyte–bacteria interactions on the removal of phthalic
acid esters from surface water, experiments with and without Potamogeton crispus L. were performed. A
two-compartment (i.e., water and plant) kinetic model was developed. The model adequately described
the variation of dibutyl phthalate (DBP) and di-2-ethylhexyl phthalate (DEHP) in the plant-water system
by providing the first-order rate constants of plant uptake (k1) and release (k2), microbial degradation in
water (k3) and plant degradation (k4). During 10-d incubation, the presence of P. crispus enhanced the
removal of DBP and DEHP from water by 6.3% and 22.4%. Compared with the experiment without
P. crispus, biodegradation of DBP in water with P. crispus decreased by 8.3% because of plant uptake even
though k3 increased by 30%. 21.4% of DBP transferred from water to plants, of which only small amount
(5.1%) retained in the plant and the rest (94.9%) was degraded. Different from DBP, biodegradation of
DEHP in water with P. crispus was a slightly higher than that without P. crispus. 25.5% of DEHP transferred
from water to plants, of which a large portion (73.3%) retained in the plant and the rest (26.7%) was
degraded. This finding reveals that the enhancement of DBP removal from surface water is mainly related
to faster degradation in the plant, whereas it is mainly related to higher plant accumulation for DEHP
การแปล กรุณารอสักครู่..
