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GPS-X Technical Reference

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Other Models 312<br />

WERF MODEL (WERFUV) WITH UV DISINFECTION<br />

The werfuv model is based upon an empirical model presented in a 1995 WERF report<br />

comparing UV irradiation to chlorination (Water Environment Research Foundation, 1995). The<br />

model estimates the effluent coliform density:<br />

Equation 11.10<br />

where:<br />

N = effluent coliform density (MPN/100mL)<br />

D = UV dose (mW·s/cm 3 )<br />

n = empirical coefficient related to UV dose (unitless)<br />

f = empirical water quality factor (unitless)<br />

The empirical water quality factor, f, was determined from regression to be described by:<br />

Equation 11.11<br />

where:<br />

SS<br />

UFT<br />

A,a,b<br />

= suspended solids concentration (mg/L)<br />

= unfiltered UV transmittance at 253.7nm (fraction)<br />

= empirical coefficients (unitless)<br />

<strong>GPS</strong>-X <strong>Technical</strong> <strong>Reference</strong>

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