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Automotive-Parts Plant - Mexico

Double Pass Reverse Osmosis System for Maximizing System Recovery (Automotive-Parts Plant in Mexico)

Pure Aqua, Inc. recently started working with a Mexico-based Japanese company to provide them a water filtration solution to treat a city water supply to attain a low TDS water quality needed for their equipment. The plant makes automotive products for different car brands and one of their environmental stewardship is to reuse the waste water they produce, as well as decrease their city water supply needs. Pure Aqua and the customer discussed multiple options that Pure Aqua offered and came to an agreement on the proper water filtration systems to do the job.

The system built is a 2-prong approach, which involved a series of water filtration as discussed below:

  • Double Pass RO (DPRO) and EDI to produce pure water dictated by the process equipment specifications. The 1st pass is composed of 8-units of 4”x40” membranes that was designed to recover (55%) of the feed. The permeate of the 1st pass RO is fed into the 2nd pass RO to further reduce the TDS. Then, the permeate of the 2nd pass RO is fed into the EDI system. The EDI will then drop the water TDS to the required quality of the process equipment. The concentrate water on the 1st pass RO, which is around 9,433 GPD, is then fed into another Brackish Water RO unit. This process will recover more water that can then be used in the loop together with the concentrate waste water of the 2nd pass. The concentrate water of this BWRO, which is around 4,412 GPD, goes to their treatment plant as waste water.
  • The process water used in the plant, which is around 6,000 GPD, now has to be recycled and re-used for this same loop. In place is a UF filter and a cartridge filter to remove the Suspended Solids from this rather good quality water and the permeate goes back as feed water into the whole system.

This system is able to reduce the amount of water needed by the plant from the city water supply by almost 55%. The plant needs to have 15 GPM of feed water from the raw water tank, but since we are able to recycle most of the water, the customer only needed to get around 6.6 GPM from the city. Pure Aqua has helped save an average of 8.4 GPM of city water. 

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