Water Purification SystemsCANDESAL can provide water purification systems that can:
The design of the equipment can support a variety of operating configurations: series, parallel, isolation, bypass, recirculation, back flush, draining, with consideration given to modular, expandable, scalable, and compact design. Passing the feed-water through our RO Unit multiple times has yielded up to 90% recovery of the water in previous projects. Feed-water analyses will need to be provided to CANDESAL for a full evaluation to maintain adequate pre-treatment in order to maintain the expected overall recovery. The extent of pre-treatment and the overall project recovery will be dependent upon the raw water quality. The following sections are often necessary: Sediment Removal:The purpose of sediment removal is to prevent damage to water filtration equipment and make the water suitable for its intended purpose. In a reverse osmosis system, because of the narrow passageways in the membranes, the sediment should be reduced to a size less than 10 um and a Silt Density Index (SDI) less than 5, or a turbidity of less than 1 NTU. This is often accomplished in stages, with screen filters used for coarse filtration, and bag filters or cartridge filters used for fine filtration. Organic removal:The purpose of organic removal is to protect the reverse osmosis membranes. Hydrophobic oils and greases should be removed to a concentration below 0.1 mg/L as recommended by the membrane manufacturer. Other organic material can be tolerated to a higher level, but the membrane manufacturer recommends a concentration less than 3 mg/L. Organic removal can be accomplished with equipment that removes free oil, specially-treated filters, organoclays, and activated carbon, depending on the contaminants. Cleaning (CIP) Tank:The purpose of the cleaning tank is to store a volume of permeate appropriate to flush and/or clean the pre-filtration unit, the RO unit, and associated piping. We can offer the pre-filtration units as a lease or straight sale. A typical prefiltration unit is shown in the pictures below.  
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