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Comparison of polycaprolactone and starch/polycaprolactone blends as carbon source for biological denitrification
Shen, Z.Q.; Hu, J.; Wang, J.I. & Zhou, Y.X.
Abstract
The cross-linked starch/polycaprolactone
(SPCL10) and starch/polycaprolactone (SPCL12) blends
were prepared, characterized and used as carbon source and
biofilm support for biological nitrate removal. The results
showed that SPCL10 and SPCL12 had similar performance
on water absorption (about 21 %) and leaching capacity.
FTIR spectra confirmed the cross-linking reaction between
starch and PCL. SEM displayed a thermoplastic nature of
SPCL10 and SPCL12. These blends could serve as solid
carbon source and biofilm support for biological denitrification,
and the acclimation time of microbial biofilm on the
surfaces of SPCL10, SPCL12 and PCL were about 2 days,
2 days and 16 days, respectively. The average denitrification
rates were 0.0216, 0.0154 and 0.0071 mg NO3-N/(g h)
for SPCL10, SPCL12 and PCL, respectively, and the
effluent NO2-N concentration was below 1 mg/L at all
cases. The phenomenon of ammonia formation was
observed, but ammonia concentration was below 0.5 mg/L.
Keywords
Biodegradable polymer; Starch; Polycaprolactone; Nitrate; Denitrification
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