AquaZoom - Model DT - Reverse Osmosis Membrane Modules
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What is the Blue Disc and what does it do?
Each cushion is inserted between two blue plastic hydraulic discs which direct the feed flow around the membrane. These assemblies are stacked by placing them over a tie rod and sliding the rod up through the central passageway to create the plate and frame structure.
DT Module Flow Schematic
How does the module make clean water?
Feed flows between in the inside of the housing and the outside of the hydraulic discs. It then flows radially into the chamber created by the first pair of hydraulic discs that contains a single membrane cushion. Feed flows over each subsequent membrane cushion contained within the hydraulic disc structure. Each cushion extracts permeate driven by differential pressure acrosss the membrane. Permeate then flows through the permeate carrier and then into the annulus between the hydraulic discs sealed with o-rings and the tie rod from which it flows to the outlet end of the module. When the feed exits the last chamber, it leaves the module as concentrate as it contains materials retained by the membrane in the remaining liquid.
It should be noted that there is no feed spacer in this module design. This feature is a huge advantage when treating highly contaminated feedstreams.
AquaZoom DT RO Membrane Module Advantages
- The open feed channel does not clog with solids and provides an unobstructed path for feed flow.
- Feed pre-treatment requirements are minimized allowing feed water with a silt density index exceeding 5 to be used with the DT module. This reduces the cost and size of the pretreatment equipment relative to traditional spiral wound RO modules.
- Improved mass transport results in reduced fouling and scaling, and higher and more sustainable permeate flux.
- The hydraulically open module without the feed spacer minimizes dead spaces in the module lending itself to more efficient cleaning.
- Simple module assembly provides for ease of maintenance.
- The membranes can be easily accessed to allow for replacement of one or all the cushions.
- Individual cushions can be easily and inexpensively removed and replaced facilitating membrane analysis for process and cleaning optimization.
- System design is straight forward with modules piped in parallel.
- Expensive recirculation pumps and piping loops are eliminated.
- Process is simple and reliable.
- Systems can be easily containerized.
- Multiple stages in parallel or series can be implemented.
- Systems can be easily integrated into new or existing water treatment process trains.
AquaZoom DT Product Offerings
The DTG (Disc Tube Grand) module is the lead product in the DT family. It has been used extensively in landfill leachate treatment for many years. The module has 9.8 m2 of membrane area (105.7 ft2) and can produce about 7.2 m3/d (80 gph) of effluent with the actual rate dependent on feed and process conditions.
The DT (Disc Tube) module is the original DT module type. Quite often procured as a replacement in existing installations, it has a smaller amount of surface area in a shorter design. The 7.9 m2 of membrane area (85.5 ft2) produces proportionally less permeate but requires less space and power for each module.
Both the DT and the DTG modules can have their materials of construction modified so the modules can operate reliably on high chloride feedstreams. Their compactness and ease of operation make these modules particularly useful in offshore applications.
Replacement parts for AquaZoom DT and DTG modules are available. Replacement cushions and elastomeric seal kits are listed on the various product datasheets.
Datasheets are available in the DT Product Download Center. Please scroll down to the next section to find documents providing details for our DT products.
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