E. I. du Pont de Nemours & Co., Inc.
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.
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.
Estimated waste water reduction is approximately 57MM gal/yr.
Details of Reductions
Additional Information :
Payback period for these modifications is under a year.