Reliable Protection from Membrane-Fouling,use water ...

1 1331 . Leopold . 1 . Master . 1 . 20120123. 1) The tissue in plants that brings water upward from the roots Leopold Clari-DAF (Dissolved Air Flotation) System 2) A leading global water technology company We're 12,000 people unified in a common purpose: creating innovative solutions to meet our world's water needs. Developing new technologies that will improve the way water is used, conserved, and re-used in the future is central to our work. We move, treat, analyze, and return water to the environment, and we help people Effective Removal of Low-Density Solids Feature Benefit use water efficiently, in their homes, buildings, factories and farms. In more than 150 countries, we have strong, long-standing relationships with customers who Reliable Protection from Membrane-Fouling, The Leopold Clari-DAF system high-rate dissolved air flotation clarification is a particularly effective desalina- No Polymer Required High Loading Rate Membrane Protection Compact design know us for our powerful combination of leading product brands and applications expertise, backed by a legacy of innovation.

2 performance - inhibiting seawater Contaminants tion pretreatment for seawater . Up to 6 gpm/ft 2 (15 m/hr), Increased flow-through 8 to 12 times that of conven- Reverse osmosis (RO) membrane filters are an The process is designed on the concept that it is tional clarification tanks For more information on how Xylem can help you, go to effective means of producing potable water easier to float low-density solids than to settle them. Compact Design Improved land use, especially from seawater . However, RO membranes are Normally, solids that are hundreds of microns in size One-fourth to 1/10th the foot- in existing plants with no intended for removing only salt and dissolved are required to settle while particles that are only tens print of conventional clarification room for expansion ions. Seawaters also can contain any or all of a of microns in size can be floated. Effective Operation 6.

3 00 million approximately 40-micron bubbles per gallon number of contaminants color, organics, soluble Source water contaminants such as membrane-fouling (160 million per liter) increases metals, oil, algae that can foul the membranes, af- algae (red tide) and free or emulsified oil that are natu- the chance of bubbles attaching themselves to suspended floc fecting effluent water quality, and even damaging rally buoyant are also best removed by flotation. the membranes and causing them to fail. Leopold . Eliminates increased chemical addition and mixing at desalination pretreatment systems can significantly How It Works increased expense necessary reduce these contaminants before they reach your with conventional clarification A. ir under pressure is dissolved into water according to achieve larger, heavier floc RO membranes. to Henry's Law of Dissolution that will settle Installation in Concrete Tank Contributes to keeping capital Solutions for Every Desalination R.

4 Eleasing the pressure via a special device creates costs low and minimizing millions of microbubbles approximately 30 to 100 corrosion Pretreatment Application microns in diameter Rapid Start-Up Good-quality effluent achiev- We offer two desalination pretreatment system tech- able within 45 minutes of nologies Leopold FilterWorx rapid gravity media T. he microbubbles attach to floc in the water and start-up vs. several days for filtration and Leopold Clari-DAF dissolved air flotation . float it to the surface for removal other high-rate processes that can be used individually or in combination to Ideal where daily flow varia- T. he floated sludge is removed from the surface of tions occur and continuous provide the cleanest influent to feed the RO membrane the water by hydraulic means operation of full plant capacity filters. Leopold Clari-DAF and FilterWorx systems are is not needed able to handle changing source water conditions.

5 C. larified water is removed from the bottom of the Ideal for automatic start-up And every system is custom-designed to the specific basin by laterals and shut-down without operator and associated requirements of your RO membrane plant. Packed Tower Saturator labor costs Proven Reliability Leopold desalination pretreatment systems are in place and operating in RO membrane filtration plants located in the Middle East and Australia. They are treating raw water supplies with an SDI of 8 to 10, with excursions as high as 15. Using iron-based coagulants, and passing through a dual media anthracite/sand gravity filter at loading rates of 3 to 4 gpm/ft 2 ( to 10m/hr), the effluent SDI is consistently below 3 .. within First Stage Flocculators the SDI required by RO membrane suppliers. Xylem, Inc. Second Stage Flocculators Leopold is a brand of Xylem. For the 227 South Division Street Recycle Pumps Effluent Laterals Bubble-Generating Nozzles latest version of this document and more Zelienople, PA 16063.

6 Air Compressor information about Leopold products visit Telephone: (724) 452-6300. Fax: (724) 452-1377. 3 2012 Xylem, Inc. Leopold FilterWorx Rapid Gravity Media Filter System Leopold In-Filter Clari-DAF System Effective Pretreatment for How It Works When Available Space Is Limited Feature Benefit Feature Benefit Desalination Plants S. uspended particulates are removed from water by When both processes are required for pretreatment, Down-Flow Design Works with gravity, eliminating All the features and benefits of the Leopold Clari-DAF System With the correct coagulation chemistry, a Leopold flowing the water via gravity at a high rate through the need to pump influent combining the clarification and filtration into one and Leopold FilterWorx System PLUS. FilterWorx rapid gravity media filter system can remove the filter media where they are removed within the through the media system will reduce the total space requirement.

7 Depth of the granular material Effectively designing the flotation system over the Compact Design T. wo unit operations in one clays, colloidal silica, precipitated metal hydroxides, humic Depth Filtration Efficiently stores solids footprint is cost-effective, and fulvic acids, and some levels of algae and bacteria. F iltered water is removed from the filter through Handles wide swings in solids filters will help those desalination systems with even eliminates duplicate structures an underdrain system loading tighter footprint constraints; and with algae, oil, and Improved land use, especially The FilterWorx rapid gravity media filter system is a com- Provides long filter runs low-density flocs to be removed, a Leopold In-Filter in sites with little room for plete system comprised of a filter underdrain, filter media, C. leaning the filter media is accomplished with an expansion Versatile in meeting a variety Clari-DAF system may be the answer.

8 Backwash troughs, backwash pumps and blowers for up-flow water wash with either full bed fluidization of source water conditions Multi-Barrier Better performance air/ water media cleaning, valves, and instruments and or sub-fluidization, depending upon the media The In-Filter Clari-DAF system contains a flotation Rapid Rate Filtration High production rates Two processes in the same unit controls. The control system can be adapted to an exist- system and media filtration system in the same unit. A. ir scour is also used to ensure thorough Flexible Filter Design Can be designed to a variety The gravity media filters replace the collector laterals M. ultiple containment removal ing SCADA or to a SCADA system provided by Xylem. of site conditions or existing mechanisms cleaning resulting from higher shear filter basins in the bottom of the Clari-DAF system, and backwash Gravity filtration eliminates the need for high-pressure forces in the media bed and abrasion Type S Dual Parallel Superior uniformity of back- troughs and additional controls are added to allow pumps, reducing operation and maintenance costs between grains of media wash distribution Lateral Underdrain filter backwashing, when required.

9 Versus comparable pressure filter systems. B. oth the backwash water and air scour Cost-effective, efficient media cleaning are introduced into the bottom of the Ensures full use of the filter bed media bed through the underdrain system . Backwash Troughs Backwash Waste Filter Media Engineered Filter Media Sand or sand/anthracite (If Required) D. uring high-rate backwash, the volume of water Products media available in a variety Spray Wash System Rapid Mixer above the filter media bed increases to just above of sizes and shapes provides efficient performance Filter Control the backwash trough edge Packed Tower Filter bed is engineered to Waste Gullet Saturator D. irt is dislodged and flushed out of the media, specific effluent requirements pushed to the surface of the water by the upward FilterWorx Control System PLC-based controls developed First Stage Backwash Troughs Flocculators Media Support flow, and captured via water overflow into the exclusively for optimum filter (If Required).

10 Operation backwash troughs Second Stage Universal Type S Unparalleled data logging Flocculators Underdrain D. irty backwash water is evacuated from the filter capability for recovery Bubble-Generating Nozzles Air Effluent/ Flume Backwash Filter Media Universal Type S Underdrain water Recycle Pumps Air Compressor Sludge Channel Gullet The concurrent air/ water backwash system provides collapse pulse cleaning of the media bed to remove compacted solids deep in the media, while Leopold . Type S dual parallel lateral underdrain provides equal water pressure and uniform air/ water backwash flow throughout the media bed. This ensures thorough and efficient cleaning of the media throughout the entire bed and return to filtration shortly after backwashing. The volume of water for backwashing is reduced up to 60% compared to conventional, water -only cleaning systems because unneeded water is replaced by air.