Laserfiche WebLink
M M <br /> LFR Inc. <br /> source and target substrate loading is often stated in terms of Total Organic Carbon <br /> (TOC), it is the availability of hydrogen that drives the ERD process. TOC is a useful <br /> indicator as it can readily be detected in the laboratory. TOC has therefore been used as <br /> an indicator to determine the location and concentration of substrate in a targeted ERD <br /> treatment zone. For our cost/benefit analysis, we will discuss selected substrates on a <br /> cost-per-unit-of-hydrogen basis. <br /> The following table borrows heavily from the August 2004 "Principals and Practices of <br /> Enhanced Anaerobic Bioremediation of Chlorinated Solvents," published by the Air <br /> Force Center for Environmental Excellence (AFCEE). <br /> Substrate Cost Comparison <br /> Approximate <br /> Ratio of Hydrogen Cost per Approximate <br /> Substrate Mass Produced to Pound of Cost per Pound <br /> Substrate Mass Product of Hydrogen <br /> SRS/EOS (assumes 60% oil, 4% <br /> lactate) 0.071 $2.00 $29 <br /> Molasses (assumes 60% sucrose) 0.027 $0.30 $11 <br /> Cheese Whey Varies $1.50 Moderate <br /> Linoleic Acid (soybean, corn, <br /> CAP18TM, other oils) 0.115 $1.20 $11 <br /> Lactate 0.067 $3.00 $45 <br /> Fructose 0.045 $0.50 $11 <br /> Sucrose 0.047 $0.50 $11 <br /> HRC 0.055 $6.00 $110 <br /> HRC-X 0.11 $9.00 $82 <br /> The prices in the above table are approximate as the current price climate for carbon <br /> substrates is volatile, with recent significant increases seen in the costs of high fructose <br /> corn oil, molasses, and cheese whey. The cheapest substrates on a per-pound-of- <br /> hydrogen basis are molasses, vegetable oil, and sugars (sucrose and fructose). While <br /> not shown in the table due to uncertainties about hydrogen content, cheese whey is <br /> believed to have a moderate cost per pound of hydrogen and shares molasses's ease of <br /> handling, mixing, and delivery. The emulsified oil products (EOS and SRS) are in the <br /> mid range of costs, while HRC-X and HRC are the most expensive. If cost per pound <br /> of hydrogen were the driving factor in substrate selection molasses, vegetable oil or one <br /> of the sugars would be the best choice. <br /> Page 16 wp.Phv_IRA-Sep07-Fi=1-06750.dw:1@ <br />