In MLE process of nutrient removal system, how much the HRT of Anoxic and Aerobic reactor should be maintained to get maximal nitrogen removal?

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Ufuk G Erdal

HRT is not a critical design and control parameter to consider but solids retention time (SRT). This is depending upon the wastewater temperature. For example a total SRT of 10-12 days would be sufficient at wastewater design temperature of 20oC whereas total SRT of more than 20-25 days is needed at 10oC. Anoxic and aerobic SRTs are depending on feed wastewater quality, target effluent nitrogen configuration and process configuration. IWA based simulation models (i.e., Biowin, GPSX) are available to determine anoxic and aerobic SRTs.

Design engineers provide adeqaute tank volume to keep the biomass in suspension and allow proper mixing and oxygenation all of which dictate the minimum HRT. Although HRTs may vary, typical minumum anoxic and aerobic HRTs in MLE systems are 1.5-3 and 6-10 hrs.

Pania Hadj

does anyone know how to design one? I am having trouble with the mass balances!