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Cost Function for fast mechanical mixer

Cost Functions

The original cost function (A1) for mechanical rapid mixing is as follows:

Función de costos para Mezcla rápida mecánica (1)

This has as variable (x) the total volume of the rapid mix in ft3 (cubic feet). To convert it into a function of Flow (Q), the following relationship was used:

Función de costos para Mezcla rápida mecánica (2)

Where Tr is the residence time, that is, the time that the water is in the process. For the fast mixing, a usual time of 30 s was taken, so the replacement of the variable was done like this:

Función de costos para Mezcla rápida mecánica (3)

Additional modifications to this function correspond to the correction of costs per year, with the CCI ENR index of 9547 of the year 2013, to obtain A3. Then the part B2 related to the elasticity index is added. This is done in the same way as explained in the article Cost functions - general.

Hence, the function obtained is the following:

Función de costos para Mezcla rápida mecánica (4)

Bibliography

  1. Preliminary Cost Estimation Models for Construction, Operation, and Maintenance of Water Treatment Plants Jwala R. Sharma, Ph.D., M.ASCE; Mohammad Najafi, Ph.D., P.E., F.ASCE; and Syed R. Qasim, Ph.D., P.E., M.ASCE 2013

    Reliable cost estimation of construction, operation, and maintenance (O&M) of water treatment plants is essential for project planning and design. The authors have developed construction and O&M cost models for different unit operations and processes involved in water treatment plants. This paper presents the use of a single cost index to further update construction and O&M costs.

References

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