Methanol Carbon Source for Denitrification
CAS Number: 67-56-1
Technical grade methanol (CH3OH) is the most widely used external carbon source for biological denitrification in municipal and industrial wastewater treatment. Denitrifying bacteria utilize methanol as an electron donor to reduce nitrate (NO3-) and nitrite (NO2-) to nitrogen gas (N2), achieving effluent total nitrogen (TN) targets. Methanol offers high C:N efficiency and rapid bacterial uptake compared to alternative carbon sources.
Technical Specifications
| density | 0.790–0.793 g/cm³ (20°C) |
| appearance | Clear colorless liquid |
| boiling point | 64.5–65.0°C |
| water content | ≤0.1% |
| C N dosing ratio | 2.5–5.0 g CH3OH per g NO3-N |
| methanol content | ≥99.5% |
Applications
- Municipal wastewater biological denitrification
- Industrial effluent nitrogen removal for discharge compliance
- Tertiary denitrification filters carbon supplementation
- Sequencing batch reactor (SBR) carbon dosing
- Membrane bioreactor (MBR) TN polishing
Key Features
- Highest C:N efficiency among common carbon sources — lowest excess sludge generation
- Rapid denitrification kinetics enabling compact reactor design
- Consistent purity ensures predictable dosing and TN compliance
- Cost-competitive versus acetic acid, ethanol, and glycerol carbon sources
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