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Area of Science:

Environmental Science
Analytical Chemistry
Wastewater Treatment

Background:

Landfill leachate contains high ammonia concentrations, leading to partial nitrification and nitrite formation in sequencing batch reactors (SBRs).
Nitrite presence in treated effluent can interfere with soluble chemical oxygen demand (COD) measurements.
Accurate COD measurement is crucial for assessing wastewater treatment efficiency.

Purpose of the Study:

To determine the interference of nitrite with soluble COD measurements in landfill leachate treated by SBRs.
To evaluate the applicability of the theoretical COD contribution of nitrite (1.1 mg COD/mg nitrite).
To provide recommendations for accurate COD measurement in nitrite-containing effluents.

Main Methods:

Utilized synthetic wastewater simulating young and old landfill leachate as influent for SBRs.
Introduced a mixture of raw wastewater and landfill leachate to a third SBR.
Monitored partial nitrification and detected nitrite in effluents from all reactors.
Compared experimentally determined COD values with theoretical nitrite contributions.

Main Results:

Nitrite was detected in the effluents of all SBRs due to partial nitrification.
The experimentally determined COD contribution of nitrite was significantly higher than the theoretical value of 1.1 mg COD/mg nitrite.
Observed COD values were up to three times higher than theoretical predictions for SBR1 and SBR3, and even higher for SBR2.

Conclusions:

The theoretical factor of 1.1 mg COD/mg nitrite is not applicable for accurate COD prediction in the studied landfill leachate effluents.
Nitrite significantly overestimates soluble COD measurements in treated landfill leachate.
Elimination of nitrite prior to measurement is essential for accurate soluble COD determination in such samples.