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Waste Treatment for the CIP System 319<br />

FIGURE 2 Oversized drain at CIP skid. Source: Courtesy of Lonza Biologics, Portsmouth, NH,<br />

U.S.A.<br />

delivery frequency (Fig. 4). These acid and base solutions require appropriate<br />

operator safety precautions and special containment for their storage tanks. It is<br />

common to provide spill containment for 110% of maximum stored volume as well<br />

as complete segregation of the acid and base in case of aspill. The reaction caused<br />

by aspill of these stored quantities of acid and base could lead to dangerous heat<br />

levels generated from the exothermic reaction as well as noxious fumes.<br />

The design and installation of equipment to handle the neutralization<br />

procedure must give consideration to the following factors:<br />

& Spill containment<br />

& Segregation of acid and base<br />

& Color-coded and labeled piping and fill connections<br />

& Metering pumps (with installed spares)<br />

Because of the logarithmic nature of the pH scale, adifferent quantity of base<br />

is required to adjust the pH from2to 3ascompared to adjusting the pH from5to 6.<br />

The quantity of chemical required for neutralization is also affected by: ( i )incoming<br />

solution pH, ( ii) type and concentration of CIP chemical used, (iii) type and<br />

concentration of neutralization chemical used, ( iv) overall alkalinity of the wastewater<br />

stream, ( v )buffering capacity of the wastewater stream, and ( vi) dilution of

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