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MULTISOLUTION APPROACH TO AN ELECTRONIC FIRMS COMPLEX WASTEWATER DISCHARGE PROBLEMS Ronald B. Friedman, Consulting Engineer Wappingers Falls, New York 12590 Richard Arnesen, Facilities Engineer Fairchdd Camera and Instrument Corporation Wappingers Falls, New York 12590 A. A. Friedman, Associate Professor Department of Civil Engineering Syracuse University Syracuse, NY 13210 Fairchdd Camera and Instrument Corporation's Wappingers Falls, NY facdity manufactures MOS chips resulting in an acidic waste stream high in fluorides and ammonia. The treated wastes discharge to an intermittent stream and must meet New York SPDES effluent limitations of 2.4 mg/1 F and 2 mg/1 NH3-N. The need to plan for production expansion requirements for a renewal SPDES Permit coupled with a history of periodically discharging up to 100 mg/1 F and 20 mg/1 NH3-N dictated the need for substantial changes in the wastewater treatment system. This paper describes the steps taken to evaluate and utilize existing facdities to economically meet the stringent effluent limitations for fluoride and NH3-N. WASTEWATER SOURCES Four major waste streams contributed to two point discharges as indicated in Figure 1. Non-contact cooling water (NCCW) and excess deionized process water (DI) with a combined flow of about 200 gpm were discharged to a storm drain system that also receives roof drainage along with surface drainage from a small portion of a parking lot. This NCCW stream does not require treatment and is discharged directly to an intermittent stream. Sanitary wastes (about 7000 gpd) are first treated by a septic tank-subsurface and filter system. Effluent from the sand filter is collected and receives further treatment along with other wastes in aerated lagoons. A fluoride acid waste stream (about 5000 gpd) is collected and discharges to two 10,000 gallon holding/neutralization tanks. The fluoride acid waste stream, designated as FW in Figure 1, usually has a pH around 1 and typically contains about 2000 mg/1 F and about 1000 mg/1 NH3-N. The balance of the waste waters, designated as IW on Figure 1, consist of about 1 10,000 gpd of various quench and rinse waters and waste acids such as H2 SO« that are discharged to a 20,000 gallon aerated neutralization tank. Lime and/or caustic soda were added to the FW wastes in the 10,000 gallon tanks as an uncontrolled batch neutralization process, the pH adjusted supernatant was then pumped to the inlet of the neutralization tank where it co-mingled with the IW stream. A pH probe in the 20,000 gallon neutralization tank activated a caustic soda feed pump on demand. The neutralization tank effluent and treated sanitary wastes are mixed at a manhole and then discharged to an aerated lagoon system consisting of four 250,000 gallon cells in series. An end wick filter, consisting of a submerged perforated pipe surrounded by graded gravel and filter sand in each of the last two cells provided the final treatment step prior to disinfection and discharge. Lime and calcium sludge from the HF acid holding/treatment tanks and sanitary septic tank sludge were removed on a routine basis by approved scavengers. 686
Object Description
Purdue Identification Number | ETRIWC198068 |
Title | Multisolution approach to an electronic firm's complex wastewater discharge problems |
Author |
Friedman, Ronald B. Arnesen, Richard Friedman, A. A. (Alexander A.) |
Date of Original | 1980 |
Conference Title | Proceedings of the 35th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://earchives.lib.purdue.edu/u?/engext,31542 |
Extent of Original | p. 686-693 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital object copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Date Digitized | 2009-10-22 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 686 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Transcript | MULTISOLUTION APPROACH TO AN ELECTRONIC FIRMS COMPLEX WASTEWATER DISCHARGE PROBLEMS Ronald B. Friedman, Consulting Engineer Wappingers Falls, New York 12590 Richard Arnesen, Facilities Engineer Fairchdd Camera and Instrument Corporation Wappingers Falls, New York 12590 A. A. Friedman, Associate Professor Department of Civil Engineering Syracuse University Syracuse, NY 13210 Fairchdd Camera and Instrument Corporation's Wappingers Falls, NY facdity manufactures MOS chips resulting in an acidic waste stream high in fluorides and ammonia. The treated wastes discharge to an intermittent stream and must meet New York SPDES effluent limitations of 2.4 mg/1 F and 2 mg/1 NH3-N. The need to plan for production expansion requirements for a renewal SPDES Permit coupled with a history of periodically discharging up to 100 mg/1 F and 20 mg/1 NH3-N dictated the need for substantial changes in the wastewater treatment system. This paper describes the steps taken to evaluate and utilize existing facdities to economically meet the stringent effluent limitations for fluoride and NH3-N. WASTEWATER SOURCES Four major waste streams contributed to two point discharges as indicated in Figure 1. Non-contact cooling water (NCCW) and excess deionized process water (DI) with a combined flow of about 200 gpm were discharged to a storm drain system that also receives roof drainage along with surface drainage from a small portion of a parking lot. This NCCW stream does not require treatment and is discharged directly to an intermittent stream. Sanitary wastes (about 7000 gpd) are first treated by a septic tank-subsurface and filter system. Effluent from the sand filter is collected and receives further treatment along with other wastes in aerated lagoons. A fluoride acid waste stream (about 5000 gpd) is collected and discharges to two 10,000 gallon holding/neutralization tanks. The fluoride acid waste stream, designated as FW in Figure 1, usually has a pH around 1 and typically contains about 2000 mg/1 F and about 1000 mg/1 NH3-N. The balance of the waste waters, designated as IW on Figure 1, consist of about 1 10,000 gpd of various quench and rinse waters and waste acids such as H2 SO« that are discharged to a 20,000 gallon aerated neutralization tank. Lime and/or caustic soda were added to the FW wastes in the 10,000 gallon tanks as an uncontrolled batch neutralization process, the pH adjusted supernatant was then pumped to the inlet of the neutralization tank where it co-mingled with the IW stream. A pH probe in the 20,000 gallon neutralization tank activated a caustic soda feed pump on demand. The neutralization tank effluent and treated sanitary wastes are mixed at a manhole and then discharged to an aerated lagoon system consisting of four 250,000 gallon cells in series. An end wick filter, consisting of a submerged perforated pipe surrounded by graded gravel and filter sand in each of the last two cells provided the final treatment step prior to disinfection and discharge. Lime and calcium sludge from the HF acid holding/treatment tanks and sanitary septic tank sludge were removed on a routine basis by approved scavengers. 686 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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