Presentation Title

Solids Analysis of a UASB-HRAP Wastewater Treatment System in Brazil

Faculty Mentor

Monica Palomo, Matthew Verbyla

Start Date

23-11-2019 10:00 AM

End Date

23-11-2019 10:45 AM

Location

165

Session

poster 3

Type of Presentation

Poster

Subject Area

engineering_computer_science

Abstract

In recent years, significant research in the implementation of Upflow Anaerobic Sludge Bed (UASB) reactors have shown that the UASB reactor can be an effective contributor to sustainable wastewater treatment. In warm climates, the reactor requires very low energy input to provide secondary wastewater treatment and the recovery of important resources such as biogas and nutrient-rich biosolids. The aim of this study was to perform a solids analysis as an indicator for the performance of a wastewater treatment system located in Belo Horizonte, Brazil that consisted of a UASB reactor followed by two high-rate algal ponds. The Standard Methods for the Examination of Water and Wastewater were used to obtain total solids, total volatile solids, total fixed solids, total suspended solids (TSS), total dissolved solids, settleable solids, and moisture content. A composite sample was taken from six sampling points throughout the system on four separate days over a period of five weeks. Because the sample sets were taken on different dates, the amount of days that passed since the UASB reactor had been desludged varied, which provided insight into fluctuations in performance of the reactor between desludging cycles. Over the 5-week period, sludge samples maintained consistent results while liquid samples contained higher variance. The results from the UASB showed a mean TSS of 118.6 mg/L in effluent, and an average of 57.1 percent removal of TSS from raw sewage. This does not meet EPA TSS limits at 30 mg/L. Possible contributors to the high TSS concentrations include re-circulation of algae and high deviations in reactor performance on the fourth sampling day. A second analysis was performed with the exclusion of the fourth test which resulted in a mean TSS of 70.8 mg/L in UASB effluent, and an average of 77.0 percent removal of TSS.

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Nov 23rd, 10:00 AM Nov 23rd, 10:45 AM

Solids Analysis of a UASB-HRAP Wastewater Treatment System in Brazil

165

In recent years, significant research in the implementation of Upflow Anaerobic Sludge Bed (UASB) reactors have shown that the UASB reactor can be an effective contributor to sustainable wastewater treatment. In warm climates, the reactor requires very low energy input to provide secondary wastewater treatment and the recovery of important resources such as biogas and nutrient-rich biosolids. The aim of this study was to perform a solids analysis as an indicator for the performance of a wastewater treatment system located in Belo Horizonte, Brazil that consisted of a UASB reactor followed by two high-rate algal ponds. The Standard Methods for the Examination of Water and Wastewater were used to obtain total solids, total volatile solids, total fixed solids, total suspended solids (TSS), total dissolved solids, settleable solids, and moisture content. A composite sample was taken from six sampling points throughout the system on four separate days over a period of five weeks. Because the sample sets were taken on different dates, the amount of days that passed since the UASB reactor had been desludged varied, which provided insight into fluctuations in performance of the reactor between desludging cycles. Over the 5-week period, sludge samples maintained consistent results while liquid samples contained higher variance. The results from the UASB showed a mean TSS of 118.6 mg/L in effluent, and an average of 57.1 percent removal of TSS from raw sewage. This does not meet EPA TSS limits at 30 mg/L. Possible contributors to the high TSS concentrations include re-circulation of algae and high deviations in reactor performance on the fourth sampling day. A second analysis was performed with the exclusion of the fourth test which resulted in a mean TSS of 70.8 mg/L in UASB effluent, and an average of 77.0 percent removal of TSS.