sully4
Civil/Environmental
- Dec 4, 2002
- 1
I work for a small engineering firm, one of our projects involves the design of a small treatment plant for about 4,000 gallons per day of largely domestic wastewater for a small injection molding and assembly facility. A small portion of this flow about 200 gpd is cooling water from the injection molding process. The facility uses a scale inhibitor to protect their equipment from scaling. The problem we are having deals with how to breakdown tolytriazole based inhibitors. The New York State Department of Environmental Conservation, the regulatory agency that oversees the operation of wastewater plants is requiring that just about all (all but 0.02 mg/l)of the tolytriazole be removed from the effluent stream prior to discharge as it is known to be detrimental to certain forms of aquatic life. To date we have had no luck in this area, and have no idea what to do next. We have recommended that the facility consider cooling and reusing their cooling water but lack of space and resources do not make this option appealing to them.
WE ARE WONDERING THE FOLLOWING:
1. Is there any known biodegradable scale inhibitors that do not contain a form of tolytriazole? We have contacted many manufacturers of "biodegradable" inhibitors only to find that their products still contain a form of this compound in concentrations that are the same or greater than what is currently being used.
2. Is there any way that to reduce or breakdown tolytriazole compounds? Literature and/or references would be helpful as the NYSDEC wants reliable resources. We have spoken to several manufacturers who claimed that chlorine, granulated activated carbon filters, ultra-violet light, and ozone would break down these compounds, but they was never any literature to support this. The NYSDEC would like some evidence that the treatment will work, as they have not had any experience like this before.
Any information out there would be helpful.
Thank you so much for your time.
WE ARE WONDERING THE FOLLOWING:
1. Is there any known biodegradable scale inhibitors that do not contain a form of tolytriazole? We have contacted many manufacturers of "biodegradable" inhibitors only to find that their products still contain a form of this compound in concentrations that are the same or greater than what is currently being used.
2. Is there any way that to reduce or breakdown tolytriazole compounds? Literature and/or references would be helpful as the NYSDEC wants reliable resources. We have spoken to several manufacturers who claimed that chlorine, granulated activated carbon filters, ultra-violet light, and ozone would break down these compounds, but they was never any literature to support this. The NYSDEC would like some evidence that the treatment will work, as they have not had any experience like this before.
Any information out there would be helpful.
Thank you so much for your time.
