Water Technologies & Solutions case study

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Chrysler Mexico wastewater recycle plant Application: World's first closed loop automotive waste treatment system

Capacity: 40,000 gpd (151 m3/d)

Location: Saltillo, Mexico

Commissioned: 1993

introduction In 1992, Chrysler awarded SUEZ a contract to supply a wastewater recycling system for their engine plant near Saltillo, Mexico. The system supplied was a tubular Permaflow* membrane bioreactor (MBR) followed by reverse osmosis polishing. The system was designed to allow Chrysler to treat and recycle the oily effluent from their facility.

Performance of this facility has been excellent meeting Chrysler ‘s needs for treated water quality. Of equal importance is the membrane lifetime which has been demonstrated to be over ten years, exceeding all estimates. This plant uses a SCADA based system that allows remote monitoring of the facility.

the solution With a tubular Permaflow MBR, even the most difficult industrial wastewater streams can be treated reliably and with superior effluent quality. In fact, the final effluent quality is so high that many industries are recycling the treated water within their facilities creating a closed loop of water use and treatment and recovering up to 90% of their water.

The tubular Permaflow MBR employs tubular ultrafiltration membrane technology as the solid liquid separator that ensures the highest quality effluent and the most efficient and effective treatment. The MBR effluent can be directed to a spiral RO system without fear of fouling.

process overview Oily effluent from the Chrysler facility is pumped to the bioreactor and mixed liquor is then sent to two UF units, each with 45 Permaflow membranes.

Biomass from the bioreactor passes through the inside of the tubular membranes under pressure. Clean water is able to penetrate through the membrane wall and is collected within the membrane housing and ultimately discharged as clean effluent. The permeate is then sent to a downstream RO system for polishing before being reused within the facility.

Treated Water Results

Raw Water Final Effluent

COD (mg/L) 3,500 < 30

Bacteria (per mL) 3,000 < 10