Journal
APPLIED SCIENCES-BASEL
Volume 12, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/app12105198
Keywords
thermophilic sludge; non-volatile solids; sewage sludge; rheology; sludge conditioning; thixotropic behaviour
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Funding
- ASMia S.r.l. (ASMortara S.p.a. group)
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This study investigates the rheological properties of thermophilic biological sludge and evaluates the influence of non-volatile solids. The concentration of sodium bentonite significantly affects the consistency coefficient of the sludge. Thixotropic behavior is more pronounced at higher shear rates and can be represented by a double exponential fitting model.
In this study, the rheological properties of thermophilic biological sludge (TBS) have been investigated evaluating the influence of non-volatile solids (NVS). Calcium carbonate, sand, and sodium bentonite were separately added to the sludge to evaluate the effect of concentration and type of NVS. Results show that TBS consistency coefficient significantly enhanced increasing sodium bentonite concentration. On the contrary, calcium carbonate and sand showed relatively small influence on the rheological properties of TBS. Thixotropic behaviour of TBS has also been investigated and is more pronounced at higher shear rate (1000 s(-1)). Double exponential fitting model was the best choice to represent thixotropic behaviour in case of low (100 s(-1)) and high shear rate (1000 s(-1)), while a single-exponential model represents the best option in case of medium shear rate (400 s(-1)).
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