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Process control and design considerations for methanol-induced denitrification in a sequencing batch reactor
N R Louzeiro1, D S Mavinic, W K Oldham
1Associated Engineering (BC) Ltd., 300 - 4940 Canada Way, Burnaby, BC, Canada V5G 4M5.
Environmental Technology
|April 2, 2003
Summary
Methanol addition enhances wastewater denitrification, increasing sludge production and improving settleability. Mixing and sludge acclimatization significantly boost denitrification rates in sequencing batch reactors.
Area of Science:
- Environmental Engineering
- Microbiology
Background:
- Wastewater treatment relies on efficient denitrification processes.
- Optimizing denitrification requires understanding factors like carbon source, mixing, and sludge acclimatization.
Purpose of the Study:
- To investigate the impact of methanol-induced denitrification on key wastewater treatment parameters.
- To evaluate the influence of mixing and sludge acclimatization on denitrification efficiency in sequencing batch reactors.
Main Methods:
- Conducted full-scale sequencing batch reactor studies.
- Performed batch tests to assess mixing and acclimatization effects.
- Measured volatile suspended solids production, settleability (sludge volume index), and oxidation-reduction potential.
Main Results:
- Observed higher sludge production (0.21 kg VSS/l methanol) than stoichiometric calculations (0.17 kg VSS/l methanol).
- Settleability and oxidation-reduction potential changes correlated positively with denitrification rates.
- Sludge acclimatization and mixing significantly increased denitrification rates, with mixing showing critical importance for kinetic performance.
Conclusions:
- Methanol addition influences sludge production and settleability in sequencing batch reactors.
- Sludge acclimatization and reactor mixing are crucial for maximizing denitrification rates and efficiency.
- Optimized mixing and acclimatization can lead to substantial improvements in denitrification kinetics.