Assessment of two sludge stabilization methods in a wastewater treatment plant in Sotaquirá, Colombia
Wastewater sludge is a by-product of wastewater treatment; it is often employed in agricultural processes following appropriate microbiological stabilization. In this study, we evaluated two methods of sludge stabilization in the wastewater treatment plant of Sotaquirá, Colombia. The two assessed...
Guardado en:
| Autor principal: | |
|---|---|
| Formato: | article |
| Lenguaje: | EN ES |
| Publicado: |
Pontificia Universidad Javeriana
2020
|
| Materias: | |
| Acceso en línea: | https://doaj.org/article/ff3b9da19d5e425c8fb4a576ed291317 |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| Sumario: | Wastewater sludge is a by-product of wastewater treatment; it is often employed in
agricultural processes following appropriate microbiological stabilization. In this study,
we evaluated two methods of sludge stabilization in the wastewater treatment plant of
Sotaquirá, Colombia. The two assessed stabilization methods were dewatering on drying
beds and alkaline stabilization. The stabilization through dewatering on drying bed was
carried out for five months. Alkaline stabilization was conducted for 96 hours with three
concentrations of calcium oxide, 7 %, 9 %, and 13 % w/w. Humidity, pH, organic carbon,
phosphorus, organic nitrogen, fecal coliforms, somatic phages, total helminth eggs, and
Salmonella sp. were monitored monthly for the sludge under dewatering treatment and
at 0, 12, 24 hours for sludge under alkaline stabilization treatment. Both treatments
succeded in eliminating Salmonella sp. Helminth eggs were eliminated by alkaline
stabilization, whereas it was reduced to one or zero helminth eggs with the dewatering
treatment. Somatic phages were eliminated with alkaline stabilization but were only
reduced to 3.52 log CFU/g with the dewatering method. Dewatering on drying beds
produced biosolids that can be used for soil restoration. Whereas alkaline stabilization
produced biosolids that can be used for agricultural purposes. Alkaline stabilization
with 9 % and 13 % calcium oxide ostensibly reduced nitrogen and phosphorus contents
in the sludge, whereas 7 % calcium affected less the phosphorus concentration of the
sludge. These results indicate that sludge dewatering on drying beds is an effective sludge
sanitation protocol to be in implemented in small wastewater treatment plants, such that
in Sotaquirá, Colombia. |
|---|