Abstract
Foam formation in the excess sludge treatment facilities of biological wastewater treatment plants (WWTPs) may represent a critical issue as it could lead to several operative problems and reduce the overall plant performance. This trouble also affects a novel technology recently proposed for sludge minimization, the thermophilic membrane reactor (TMR), operating with alternate aeration/non-aeration cycles. This technology, which has proven to be extremely resilient and suitable for treating industrial wastewater of different nature, demonstrated a high potential also as a solution for integrating existing WWTPs, aiming at the “zero sludge production.” In this work, an experimental study was conducted with a TMR pilot plant (fed daily with thickened sewage sludge) by adjusting the duration of aeration/non-aeration alternate cycles. Extracellular polymeric substance (EPS) concentration (and its soluble and bound fractions) has been monitored along with foaming power indices. The results highlight that foaming can be correlated to the presence of soluble protein fraction of EPS. Moreover, EPS production seems to be reduced by increasing the duration of the non-aeration cycles: optimal operating conditions resulted 2 h of aeration followed by 6 h of non-aeration. These conditions allow to obtain an EPS concentration of 500 mg L−1 with respect to 2300 mg L−1 measured at the beginning of experimental work.
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Abbreviations
- ATAD:
-
Autothermal thermophilic aerobic digestion
- COD:
-
Chemical oxygen demand
- CV:
-
Coefficient of variation
- EPS:
-
Extracellular polymeric substance
- EPSb :
-
Bound extracellular polymeric substance
- EPSb,c :
-
Carbohydrate fraction of bound extracellular polymeric substance
- EPSb,p :
-
Protein fraction of bound extracellular polymeric substance
- FP:
-
Foaming power index calculated as consumed sample per liter of supplied air
- FP2:
-
Foaming power index calculated as foam volume produced per liter of supplied air
- MBR:
-
Membrane bioreactor
- R 2 :
-
Coefficient of determination
- SMP:
-
Soluble microbial products
- SMPc :
-
Carbohydrate fraction of soluble microbial products
- SMPp :
-
Protein fraction of soluble microbial products
- TMR:
-
Thermophilic membrane reactor
- TN:
-
Total nitrogen
- TP:
-
Total phosphorus
- TS:
-
Total solids
- UF:
-
Ultrafiltration
- UM:
-
Unit of measurement
- VS:
-
Volatile solids
- WWTP:
-
Wastewater treatment plant
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The authors wish to thank Idroclean Spa (Casirate d’Adda, BG, Italy) for technical and financial support to the research.
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Collivignarelli, M.C., Castagnola, F., Sordi, M. et al. Sewage sludge treatment in a thermophilic membrane reactor (TMR): factors affecting foam formation. Environ Sci Pollut Res 24, 2316–2325 (2017). https://doi.org/10.1007/s11356-016-7983-4
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DOI: https://doi.org/10.1007/s11356-016-7983-4