Alum Biosolids Hauling and Disposal Savings Sample Clauses

Alum Biosolids Hauling and Disposal Savings. The M&V protocol for this savings source is based on IPMVP Option A. The amount of biosolids reduction at TMWRF from reduction in Alum chemical use will be calculated based on the measured production of Xxxxxxx Xxxxx fertilizer in the previous M&V. Cost savings at the landfill will then be calculated based on this biosolids reduction. Cost savings from reduced biosolids pick-up frequency will be calculated based on the baseline amount of biosolids hauled per pick up. Measured Variables:  Xxxxxxx Xxxxx fertilizer amount (in tons) Stipulated Variables:  Fertilizer acceptance rate = 90% Financial Grade Operational Audit  P weight ratio in fertilizer = 12.7%  Biosolids dry weight ratio per P = 4.87 lb/lb  Centrifuge wet/dry biosolids ratio = 6.41 wet lb/dry lb  Baseline hauling load = 23 tons/pick up  Hauling cost = $99.90 per pick up  Landfill cost = $11.68 per ton  Cost Savings Calculations Annual fertilizer tonnage is obtained from the previous M&V work. The fertilizer amount in the invoice is the amount acceptable for resale. Assuming a 90% acceptance rate, the actual fertilizer produced at the reactor is then: Annual fertilizer produced = Measured fertilizer tonnage / 90% The Xxxxxxx Xxxxx fertilizer is an equimolar crystalline matrix of magnesium, ammonium, and phosphate: NH4MgPO4.6(H2O). The molar ratio of P in the fertilizer is 12.7% by weight. Therefore, the annual amount of P removed from the centrate is: Annual P removed = Annual fertilizer produced x 12.7% After the Pearl process installation, TMWRF will no longer use Alum to remove P from the centrate. This deferred chemical use is the reason for the reduction in biosolids production. Theoretically, every pound of P precipitated using Alum will generate 4.87 pounds of dry biosolids. The amount of biosolids saved from not using Alum can then be calculated as follows: Annual dry biosolids savings = Annual P removed x 4.87 lb/lb The biosolids that is ultimately hauled off the plant and disposed of at the landfill is not completely dry because the centrifuges cannot completely separate the biosolids from the water. Existing centrifuges at the plant generate on average 6.41 lbs of wet solid per one pound of dry solid. As such, the amount of wet biosolids that need to be hauled off the plant is then: Annual wet biosolids savings = Annual dry biosolids savings x 6.41 lb/lb This reduction in wet biosolids will save TMWRF money in two ways: (1) by reducing the number of pick- ups needed by the tru...