Zero Waste Logo The Zero Wate Network the University of Texas at Arlington Center for Environmental Excellence Environmental Training Institute Logo  

Join Us on:

Social Network Nav Bar

Lean and P2 Workshops

Houston, TX
11/18/14 - 11/20/14

 

More...

 

Environmental Management Systems Workshops

Arlington, TX
03/03/15 - 03/06/15

Houston, TX
04/07/15 - 04/10/15

Albuquerque, NM
05/12/15 - 05/15/15

 

More...

Case Study Database

           Add Story    |    Search Case Studies    |   

 

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

Year Submitted: 2003

Process: Stack Gas Cleaning

Industry: Waste Incineration

Wastes Reduced: Liquid Waste

Substance: Scrubber Liquid

Location: Orange, Orange County TX

No. of employees: 2100

Contact: F. H. Sheridan

Phone: (409) 886-6986



Description:

The Sabine River Works Regional Incinerator was commissioned in March, 1990 to treat hazardous and nonhazardous wastes from du Pont operations in the Gulf Coast area. The incinerator consists of a rotary kiln, afterburner, and a six stage combustion gas scrubbing train with dry and wet scrubbing.
A baghouse was included as one stage in the gas scrubbing train. This permits removal of flyash in dry form, while at the same time requiring an upstream quenching step to reduce the combustion gas temperature for protection of the bag material. The gas exiting the baghouse passes through several stages of wet scrubbing. Rather than dispose of the liquid purge from the wet scrubbers as a waste, the purge is recycled to the quencher ahead of the baghouse. Scrubbed solids and salts contained in the purge liquid are dried in the quencher and conveyed to the baghouse, where they are removed as flyash.

P2 Application:

Typical design for incinerator off gas scrubbing employs wet scrubbing, with subsequent disposal of the scrubbing liquid as a waste. The du Pont SRW Regional Incinerator, on the other hand, recycles the scrubbing liquid purge for use as the quenching medium required for gas conditioning upstream of the baghouse. This design capitalizes on the presence of the baghouse for removal of salts and ash accumulated in the scrubbing liquid.

Environmental Benefits:

The du Pont SRW Regional Incinerator does not produce a continuous liquid waste stream as a result of its operations. A potential waste flow of as much as 200 gallons per minute is avoided.

Details of Reductions

Additional Information :

The scrubbing liquid purge, used to cool the combustion gases in the quencher, replaces as much as 200 gallons per minute of fresh water that would otherwise be required. This translates to a savings on the order of $30,000/year.
Incinerators which dispose of scrubbing liquid purges typically must filter the liquid prior to disposal in a wastewater treatment facility, or must maintain some type of sludge treatment. Such facilities vary widely in complexity and expense; costs on the order of $50,000/year could be anticipated, as well as the investment of hundreds of thousands of dollars in the case of a new facility.

Source: TCEQ



SHEP Shield
Safety
Health and
Environmental
Professional



ERP Shield
Environmental
Regulatory
Professional



ESP Shield
Environmental
Science
Professional



EMP Shield
Environmental
Management
Professional

Attend a workshop and
earn credits toward a
Professional Certification

 

 



The Zero Waste Network is one of eight Pollution Prevention Resource Exchange P2RxCenters , serving as a national network of regional information centers: NEWMOA (Northeast), WRRC (Southeast), GLRPPR (Great Lakes), ZeroWasteNet (Southwest), P2RIC (Plains), Peaks to Prairies (Mountain), WSPPN (Pacific Southwest), PPRC (Northwest). We are a proud member of the National Pollution Prevention Roundtable.

National P2 Roundtable Logo