Bench Scale Semi-Continuous Anaerobic Co-Digestion Of Aircraft De-Icing Fluid With Municipal Sewage Sludge
The Office of Physical Plant (OPP) at University Park has received requests from the University Park airport to discharge aircraft deicing fluid (ADF) waste to the University Wastewater Treatment Plant (WWTP). Since ADF contains high Biochemical Oxygen Demand, it is a burden to secondary aeration but can be a resource for biogas production with anaerobic digestion. This project aims to evaluate the biogas potential of ADF as an alternative feedstock, maximum treatment capacity, and the necessity of an on-site storage unit at the WWTP. Eight bench-scale semi-continuous reactors were set up to simulate University Park anaerobic digesters using a respirometer. Each digester was fed daily with a combined primary and secondary sludge to achieve 46 d SRT. Digesters were completely mixed and incubated in a 35±1 oC water bath. Daily biogas production was monitored along with volatile solids (VS) and COD reduction. The results showed that co-digestion demonstrated a maximum biogas potential of 0.44 m3/kg CODadded, or 520% more than the control sludge only digestion. This interprets to additional 110,000 m3 of biogas production every season. It was observed that VFA accumulation can occur when ADF is directly fed into the digester as hauled. Hence, a storage area of 45,000 gals was suggested to accommodate the surplus ADF. With supplemental alkalinity of 7.12 lb/lb CODadded, 10% gradual increase in OLR and controlled SELR within 0.2-0.45, it was observed that the maximum load of ADF (10000 GPD) could be digested (OLR of 2.95 kg COD/m3/d) with 86% COD removal. Similarly, sTN and sTP concentrations in the digested supernatant was expected to decrease by 31% and 23% respectively compared to the sludge only control. However, the sTN and sTP returning to mainstream treatment were estimated to increase by 5.6 kg/d and 3.4 kg/d due to increased flow when ADF feed is added.
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| Work Title | Bench Scale Semi-Continuous Anaerobic Co-Digestion Of Aircraft De-Icing Fluid With Municipal Sewage Sludge |
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| License | In Copyright (Rights Reserved) |
| Work Type | Research Paper |
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| Publication Date | July 2021 |
| Deposited | October 12, 2021 |
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