A&B Test Questions - Florida Rural Water Association

6. Polarization in an RO system is caused by:a. Fouling caused by high hardnessb Fouling of the Anode or Cathodec. Brine or Regeneration concentration that is too highd. Mineral Deposits along the edge of a membranee. Plugging of Membrane inner surfaces7. Reverse Osmosis Systemsa. do not require pretreatment to remove colloidal material.b. are designed to remove minerals and colloidal materialc. require pretreatment to remove colloidal materiald. can remove colloidal material only if coagulants are added to reject8. RO systems are best operated with all units1. in series to gain maximum removal rates2. in parallel to gain maximum throughput3. staggered with gradually decreasing number of modules4. staggered with gradually increasing number of modules9. The reserve osmosis elements should be cleaned when the operator observesa. Higher differential pressuresb. Higher operating pressuresc. Higher suspended solids in product waterd. Lower product water flow ratee. Lower salt rejection10. If a salty taste is noted in an RO process what is the most probable cause:a. Polarization is occurringb Service rate us too lowc. Brine or Regeneration Rate should be increasedd. Recycle Stream is too highe. Rinse Rate should be increased24