Name: ÁTILA PAVAN VASCONCELLOS
Publication date: 24/02/2022
Advisor:
Name |
Role |
|---|---|
| ROSANE HEIN DE CAMPOS | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| EDUMAR RAMOS CABRAL COELHO | Internal Examiner * |
| RICARDO FRANCI GONÇALVES | Co advisor * |
| ROSANE HEIN DE CAMPOS | Advisor * |
Summary: Dewatering is a fundamental step in the management of sludge from Waste Water
Treatment Plants (WWTP), since its responsible for the significative reduction of
volume and consequent weight, decreasing costs relative to transport and final
disposal of this kind of waste. In this way, this study aims to evaluate the natural
dewatering on sludges from a Upflow Anaerobic Sludge Blanket (UASB) reactor, using
geotextile materials on drainage systems with different configurations, without
chemical conditionings. In this research, initially, sludges from the regions of the bed
and the blanket of the UASB reactor, treating municipal sewage, were characterized
about their physicochemical properties, their distribution of water fractions, their
dewaterability indexes and their rheological behaviour. Later, dewatering tests were
realized, being divided in three steps and using three configurations. The first aimed to
analyze the influence of the geotextile material used as filter on dewatering process.
The second, the comparison of two of the devices used and the third, the assessment
of the performance between the integration of the previous systems. Performance
indexes were used to evaluate two principal aspects: reduction of free water and the
retention of solids, related to the quality of the filtrate. Dewatering tests showed
reduction of volume in order of 70% and the sludge cake formed above the geotextile
in order of 15% of Total Solids. There was no significant difference in the results about
the influence of the geotextile blankets BIDIM RT-21, RT-26 e RT-31 and the Vertical
Static Dewaterer (DEV) exhibited the best results among the configurations used in
the dewatering devices. The formation of a filter cake above the geotextile was noticed
and it is related to the Solid Application Rates (RAS), being capable to influence in a
different way the two main aspects evaluated: reduction of volume and the solids
capture.
