Arsenic in OU-Extended Summary

Arsenic in OU-Extended Summary - Removal of Arsenic from OU...

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Removal of Arsenic from OU Water Paul Gerber, Collin Martin, John Siska Summary Report BACKGROUND AND SUMMARY On December 24, 1975, EPA issued the National Interim Primary Drinking Water Regulations. This established a maximum contaminant level (MCL) for arsenic at 5 ppb (parts per billion). Arsenic was designated as a priority for regulation under the Safe Drinking Water Act (SDWA) Amendments of 1986, and a decade later, under the SDWA Amendments of 1996, Congress required EPA to develop a revised arsenic regulation by January 2001. This revised MCL is now 10 ppb mandating that the current water distribution system has to comply by January, 2006. The purpose of this report is to portray the ability of arsenic removal technologies to properly treat the University of Oklahoma’s water wells on the North Campus located at the Max Westheimer Airport and to investigate and estimate the costs for treatment technologies that can be used by the University of Oklahoma to meet EPA regulatory standards. At this time, the University of Oklahomas’ water wells have an average of 48 ppb of arsenic concentration. Our group has been exploring different treatment options (including water purchase) to remedy the University of Oklahoma’s arsenic groundwater problem. We have examined background information on sources of arsenic in OU’s water, compliance options, initial design analyses, and cost estimates for several different treatment processes and configurations. For water treatment, our team studied Ion Exchange, Reverse Osmosis, Microfiltration, Nanofiltration, and Ultrafiltration. Of these treatment options, we found that ion exchange and reverse osmosis were able to treat the north campus water (where the arsenic well water problems are) effectively at the lowest cost to OU. Our group designed
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treatment systems using these processes and found that ion exchange was significantly cheaper than reverse osmosis. We have found that the proper course of action and the costs for these courses of action depend heavily on the current demand for potable water (see Figure 1 to read off costs at different water demands). We have found that 50:50 blending of purchased water from OKC with water from south campus wells 2, 10, and 11 (found to be 2 ppb in arsenic and 340 mg/L in hardness) is the cheapest solution to the water problem with a current consumption of less than 1.25 million gallons per day (MGPD). Blending is needed to reduce the hardness of the south campus water to an acceptable level. Above 1.25 MGPD, the north campus wells should be treated with an ion exchange plant to produce the cheapest water. With either of these treatment options, the arsenic and hardness levels in OU’s potable water supply would be 5 ppb and 200 mg/L respectively. Both of these levels are safely within regulatory limits. 0 2
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This note was uploaded on 08/31/2011 for the course CHE 4273 taught by Professor Staff during the Spring '10 term at Oklahoma State.

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Arsenic in OU-Extended Summary - Removal of Arsenic from OU...

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