Guidance for Treatment of Airport Stormwater Containing Deicers (2013) / Chapter Skim
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Pages 79-88
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From page 79... ...
79 For any given application of deicer treatment at an airport, there are likely at least two to three deicer treatment technologies that could provide the necessary degree of treatment and meet the airport's regulatory compliance objectives. As a result, in many cases, cost of treatment becomes a differentiating factor.
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From page 80... ...
80 Guidance for Treatment of Airport Stormwater Containing Deicers Cost Issue Impact Often as-built treatment costs are not isolated from other deicer management costs. As-built treatment cost numbers reported in numerous publications, including regulatory documents, may not be accurate.
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From page 81... ...
Determining Costs for Deicer Treatment 81 to provide a common basis from which all technologies could be assessed. As technologies are evaluated in more detail during the treatment implementation process, the impact of other cost considerations, like impacts of flow rate, should be incorporated.
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From page 82... ...
82 Guidance for Treatment of Airport Stormwater Containing Deicers the CPI increased 2% per year. A conservative approach would be to use 2% per year beyond 2012 to adjust the operating costs to future years.
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From page 83... ...
Determining Costs for Deicer Treatment 83 • Solids disposal; • Monitoring, permitting, and compliance fees; • Fees paid to consultants and contractors for operations and material handling; • Payback from sale of recycled glycol; and • Energy cost savings from methane captured from biological treatment and used as fuel. 6.3.3 Equivalent Annual Cost A method frequently used to jointly assess capital and operating costs is calculation of the equivalent annual cost.
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From page 84... ...
84 Guidance for Treatment of Airport Stormwater Containing Deicers 6.4 Technology-Specific Cost Considerations 6.4.1 Cost Considerations for On-Site Biological Treatment Technologies On-site biological treatment systems typically have higher capital costs and lower operating costs than other deicer treatment technologies. Many times, biological treatment systems can rely on their core processes to reach the desired effluent concentrations, eliminating the need for additional polishing treatment processes.
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From page 85... ...
Determining Costs for Deicer Treatment 85 The methane content in anaerobic digestion biogas typically ranges from 50% to 75%, whereas natural gas contains approximately 95% to 98% methane. Some modifications to burners may be necessary to burn biogas methane instead of natural gas, but systems are available that are capable of burning either fuel.
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From page 86... ...
86 Guidance for Treatment of Airport Stormwater Containing Deicers concentration established by the POTW)
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From page 87... ...
Determining Costs for Deicer Treatment 87 The costs to transport and treat at an off-site location are compared to the capital investment for an on-site facility, recycling equipment, and operating expenses. Following are considerations for determining costs for an on-site recycling facility: • Capital investment.
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From page 88... ...
88 Guidance for Treatment of Airport Stormwater Containing Deicers center. Depending on the distance to the off-site facility and the volumes of glycol generated from the airport, a cost analysis can be conducted to determine if this option is the most economical.
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