Thermal decontamination of sewage sludge
Laen...
Kuupäev
2020
Kättesaadav alates
Autorid
Dubova, L.
Strunnikova, N.
Cielava, N.
Alsina, I.
Kassien, O.
Bekker, A.
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
Every year a huge amount of sewage sludge is formed at municipal wastewater
treatment plants. Sewage sludge contains a sufficient amount of biogenic elements and organic
components, which characterizes them as possible raw materials for the production of organic
fertilizers. However, direct incorporation of these sediments into the soil is impossible due to the
fact that, in addition to useful organic and mineral components, they contain pathogens, viruses
and helminth eggs. The aim of the study was to optimise thermal disinfection conditions for
preparing of safety sewage sludge fertilizer. Laboratory studies were carried out using sediments
from wastewater treatment plants of some cities. During laboratory experiments, the conditions
for thermal disinfection of sediments – the thickness of the sediment layer, the air temperature in
the disinfection furnace, and the treatment time of the sediment – were determined. When
conducting industrial tests of a conveyor-type sediment decontamination furnace, the operating
conditions of the furnace were determined, i.e., the temperature regimes of the sludge heating
zone, the decontamination zone and the cooling zone, and the optimum parameters of the sludge
layer thickness on the conveyor and the conveyor speed were determined.
Kirjeldus
Märksõnad
layer thickness, movement speed, organic fertilizers, sewage sludge, thermal disinfection, residence time, articles