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E. I. du Pont de Nemours & Co., Inc.

Year Submitted: 2003

Process: Pumping

Industry: Chemical Manufacturing

Wastes Reduced: Wastewater

Location: Orange, Orange County TX

No. of employees: 2000

Contact: R. H. Batig


In the Adiponitrile Production Unit 36 pumps are used to pump either sumps or process equipment to the waste treatment facilities prior to deepwelling the aqueous waste. These pumps are equipped with a single mechanical seal and a throttle bushing. The estimated 3 gpm of spent seal flush water mixes directly with the pumpage, and adds to the waste load.

P2 Application:

To minimize expenditure and still provide a flushed seal, we installed a solenoid valve connected to pump motor controls which allows seal flush water to flow only when the pump is running. In addition we installed a rotometer for flush water flow measurement and control and thus can reduce the amount of waste generated.

Environmental Benefits:

Estimated waste water reduction is approximately 57MM gal/yr.

Details of Reductions

Additional Information :

Payback period for these modifications is under a year.

Source: TCEQ

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