These models should be useful for new or existing wastewater lagoons when nitrogen removal or ammonia conversion is required. The design of new systems would typically base detention time on the BOD removal requirements. The nitrogen removal that will occur during that time can then be calculated with either model. It is prudent to assume that the remaining nitrogen in the effluent will be ammonia and then design any further removal or conversion for that amount. If additional land is available, a final step can be used to compare the provision of additional detention time in the lagoon for nitrogen removal with the costs for other removal alternatives. Use of these models is particularly important when lagoons are used as a component in land treatment systems because nitrogen is often the controlling design parameter. A reduction in lagoon effluent nitrogen will often permit a very significant reduction in the land area needed and, therefore, the costs for land treatment.
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