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Polyaluminum chloride — product consumption and dosing flow

Input data

Flow

Average dose

Maximum dose

Dilution ratio

Output data

Average mass consumption

Average volume consumption

Volume of solution to be prepared

Maximum dosing flow

Description

Determine the polyaluminum chloride (PAC) product consumption and dosing flow based on the plant flow rate and the average and maximum doses. The model assumes a commercial PAC with:

  • product mass concentration C=16%C = 16\%;
  • density of the concentrated product ρ=1.34 kg/L\rho = 1.34\ \mathrm{kg/L}.

Determine the polyaluminum chloride (PAC) product consumption and dosing flowDetermine the polyaluminum chloride (PAC) product consumption and dosing flow

What is calculated

  1. Average mass consumption of the product

    m˙avg=Q⋅davgC\dot m_{\text{avg}}=\frac{Q\cdot d_{\text{avg}}}{C}

  2. Average volume consumption of the product

    V˙avg=m˙avgρ⋅1000(since 1000 L=1 m3)\dot V_{\text{avg}}=\frac{\dot m_{\text{avg}}}{\rho\cdot 1000} \qquad(\text{since }1000\ \mathrm{L}=1\ \mathrm{m^3})

  3. Volume of solution to be prepared (at the concentration defined by the dilution ratio)

    Vsolution=V˙avgdilution ratioV_{\text{solution}}=\frac{\dot V_{\text{avg}}}{\text{dilution ratio}}

  4. Maximum dosing flow (based on the maximum dose)

    qmax⁡=V˙maxdilution ratioq_{\max}=\frac{\dot V_{\text{max}}}{\text{dilution ratio}}

Inputs

ParameterStandard unitsDescription
FlowL/sWater flow to be treated QQ.
Average dosemg/LDesired average PAC dose in water davgd_{\text{avg}}).
Maximum dosemg/LMaximum PAC dose in water dmax⁡d_{\max} (for peak sizing).
Dilution ratio%Percentage of dilution of the prepared solution.

Outputs

ParameterStandard unitsDescription
FlowL/sWater flow passed through the node (echoed as output).
Average mass consumptionkg/dAverage daily consumption of product (commercial PAC).
Average volume consumptionm³/dAverage daily volume of the concentrated product.
Volume of solution to preparem³/dDaily volume of PAC solution to be prepared at the specified dilution.
Maximum dosing flowL/hSolution flow (at the adopted dilution) required to meet dmax⁡d_{\max}.

References

  • VIANNA, Marcos R. Casas de química para estações de tratamento de água. 2. Ed..Nova Lima: Imprimatur, 2001. 190 p.