10
mL
20
mg O2
400
mg/L
200
mg/L
10
mL
20
mg O2
400
mg/L
200
mg/L
Chemical Oxygen Demand (COD) measures the total amount of oxygen required to chemically oxidize both organic and inorganic matter in water. Unlike BOD, which measures only biologically degradable material, COD captures the complete oxidizable content, making it a more comprehensive pollution indicator.
COD testing is faster than BOD (2–3 hours vs 5 days) and is widely used for wastewater treatment monitoring, industrial discharge compliance, and process optimization. The BOD/COD ratio indicates biodegradability: ratios above 0.5 suggest easily treatable waste.
COD = (blank - sample titrant) × normality × 8000 / sample volume. Estimated BOD₅ ≈ COD × 0.5 (for typical municipal wastewater). The factor 8000 converts milliequivalents of oxygen to mg/L.
Typical values: Clean water < 20 mg/L, moderate pollution 20–200 mg/L, industrial wastewater 200–60,000 mg/L. A COD/BOD ratio < 0.3 indicates non-biodegradable waste requiring chemical treatment.
Inputs
Results
Moderate wastewater.
Inputs
Results
High-strength industrial waste.
Chemical Oxygen Demand is a quantitative measure used in environmental science and ecology. It represents key metrics that help researchers, policymakers, and individuals understand environmental impacts. The specific definition and measurement methodology are established by international scientific organizations and regulatory bodies.
How does COD differ from BOD involves analyzing relevant parameters using established scientific methodologies. Our calculator applies peer-reviewed formulas and standard emission factors to provide accurate results. The specific approach varies by parameter but follows guidelines from organizations such as the EPA, IPCC, and relevant scientific bodies.
Why is COD testing faster involves analyzing relevant parameters using established scientific methodologies. Our calculator applies peer-reviewed formulas and standard emission factors to provide accurate results. The specific approach varies by parameter but follows guidelines from organizations such as the EPA, IPCC, and relevant scientific bodies.
Chemical Oxygen Demand is a quantitative measure used in environmental science and ecology. It represents key metrics that help researchers, policymakers, and individuals understand environmental impacts. The specific definition and measurement methodology are established by international scientific organizations and regulatory bodies.
What causes high COD involves analyzing relevant parameters using established scientific methodologies. Our calculator applies peer-reviewed formulas and standard emission factors to provide accurate results. The specific approach varies by parameter but follows guidelines from organizations such as the EPA, IPCC, and relevant scientific bodies.
How is COD measured involves analyzing relevant parameters using established scientific methodologies. Our calculator applies peer-reviewed formulas and standard emission factors to provide accurate results. The specific approach varies by parameter but follows guidelines from organizations such as the EPA, IPCC, and relevant scientific bodies.
What COD levels require treatment involves analyzing relevant parameters using established scientific methodologies. Our calculator applies peer-reviewed formulas and standard emission factors to provide accurate results. The specific approach varies by parameter but follows guidelines from organizations such as the EPA, IPCC, and relevant scientific bodies.
Can COD be reduced biologically involves analyzing relevant parameters using established scientific methodologies. Our calculator applies peer-reviewed formulas and standard emission factors to provide accurate results. The specific approach varies by parameter but follows guidelines from organizations such as the EPA, IPCC, and relevant scientific bodies.
What industries produce high COD involves analyzing relevant parameters using established scientific methodologies. Our calculator applies peer-reviewed formulas and standard emission factors to provide accurate results. The specific approach varies by parameter but follows guidelines from organizations such as the EPA, IPCC, and relevant scientific bodies.
Chemical Oxygen Demand is a quantitative measure used in environmental science and ecology. It represents key metrics that help researchers, policymakers, and individuals understand environmental impacts. The specific definition and measurement methodology are established by international scientific organizations and regulatory bodies.
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