Witco collects "clean" wastewater for reuse in non-critical areas. Boiler, cooling tower blowdown and other utility area wastewater is collected and reused for services such as floor sprays and wash water. This eliminates the use of fresh water in these application and, as a result, reduces the quantity of fresh water use.
By reusing brown water for non-critical use Witco reduced water usage by 2,000,000 gallons a year. Some rain water was also collected in the system, so the total reduction in water disposal was 2,824,000 gallons.
Details of Reductions
Additional Information :
Witco used an existing 5,000 gallon tank to store brown water. Pump, pipe, controls and other installation costs amounted to $20,000. Fresh water cost $0.001/gallon saving $2,000 annually. Disposal cost for "clean" wastewater runs about $0.025/gallon for an annual saving of $70,600.