This powerpoint presentation begins by providing a brief overview of a desalination plant project located in Santa Cruz, California. An overview of the pilot plant is provided, along with a "no chemical" pretreatment alternative, the pilot plant treatment process diagram, ultraviolet (UV) and ClO<sub>2</sub> as viable biofouling
control strategies for seawater desalination, steps to evaluate UV, and chloramines/chlorine dioxide for RO biofouling control. Lessons learned for ClO<sub>2</sub> addition
onto polyamide RO membranes include the following:
higher tolerance than for free chlorine in general;
purity - ClO<sub>2</sub> must be chlorine free;
1 ppm or less in RO feedwater; 1-4 hours is
typically suitable to disinfect a system;
low iron content is key as it acts as a catalyst for
membrane degradation;
pH influences degradation rate - lower is better; and, membrane surface chemistry may influence
degradation rate. Includes table, figures.
| Edition : | Vol. - No. |
| Number of Pages : | 37 |
| Published : | 11/01/2008 |
