Recent researches demonstrated that synthetic biodegradable polymers
including PHB, PCL, PBS and PCL/starch blends are good carriers
and carbon source for denitrification. Mergaert et al. (2001) reported a
PHBV-packed bed reactor for nitrate removal from drinking water,
they found that the maximal surface-related denitrification rate was
14 mg N m−2 h−1 at 25 °C. We studied the nitrate removal from
groundwater in a packed reactor filled with PCL, and found that the effluent
nitrate concentrations were lower than 3.7 mg N L−1 at temperatures
of higher than 24 °C and HRT of 3–6 h during a long-term
operation of 561 d. Nitrite and ammonium remained at low levels
(less than 0.32 and 0.78 mg N L−1, respectively) (Chu and Wang,
2013