The influence of anaerobic pretreatment on the nitrogen removal from biosynthetic pharmaceutical wastewaters |
| |
Authors: | Pavel Jení?ek Jana Zábranská Michal Dohányos |
| |
Institution: | (1) Department of Water Technology and Environmental Engineering, Institute of Chemical Technology, CZ-166 28 Prague, Czech Republic |
| |
Abstract: | The C:N ratio of the pharmaceutical wastewaters is usually suitable for a combination of the anaerobic pretreatment with the high COD removal and aerobic posttreatment with the efficient biological N removal. This kind of anaerobic-aerobic process was tested in semipilot scale by using a UASB reactor and an activated sludge system with a predenitrification (total volume 100 1). It was found that at a total HRT of 2.3 days an average of 97.5% of COD and 73.5% of total N was removed. The UASB reactor was operated at 30°C with a volumetric loading rate of 8.7 kg.m-3.d-1, the efficiency of COD removal was 92.2%. The processes, which take part in the biological removal of nitrogen, especially the nitrification, were running with lower rates than usually observed in aerobic treatment systems.Abbreviations AAO
anaerobic anoxic oxic configuration
- AOO
anaerobic oxic oxic configuration
- B
V
volumetric organic loading rate (kg COD.m-3. d-1)
- dB
x
specific COD removal rate (mg COD. g-1 VSS. d-1)
- DNR
denitrification rate (mg N–NO3. g-1 VSS. h-1)
- ECOD
efficiency of COD removal (%)
- HRT
hydraulic retention time (d)
- NR
nitrification rate (mg N–NO3. g-1 VSS. h-1)
- R
recirculation ratio (%)
- SBP
specific biogas production (m3.kg-1 removed COD)
- SRT
solids retention time; sludge age (d)
- SS
suspended solids (g.1-1)
- UASB
upflow anaerobic sludge blanket reactor
- VSS
volatile suspended solids (g.1-1) |
| |
Keywords: | anaerobic-aerobic wastewater treatment denitrification nitrification nitrification pharmaceutical wastewater |
本文献已被 SpringerLink 等数据库收录! |