TY - GEN

T1 - Sewage Sludge Management

T2 - 12th Hanseatic India Colloquium, Germany

AU - Mondal, Moni Mohan

AU - Nair, Rahul Ramesh

AU - Weichgrebe, Dirk

PY - 2022

Y1 - 2022

N2 - Rapidly increasing amounts of wastewater and solid waste exert pressure on urban disposal systems in the megacities of emerging economies, of which organic residues like sewage sludge pose a major challenge. Local management approaches with the volume reduction of sewage sludge, therefore, are an attractive option for urban areas. This paper investigated sewage sludge drying characteristics and elaborated on the theoretical background of designing a sludge-drying greenhouse for its volume reduction, as an alternative option in comparison to costly mechanical or thermal dewatering/ pretreatment process. The vapor balance equations are used to calculate evaporation rate where the multiplicative model is applied for the prediction of humidity ratio differences. Estimation of design parameters for a sludge-drying greenhouse is conducted for an example of sub-tropical Indian climate conditions. Especially the case study is presented based on the actual data from the sewage sludge generation at Infosys IT-Complex campus in Bangalore city with its local meteorological information. A sensitivity analysis has also been performed & presented to see the impacts of one drying parameter on the others and vice-versa. This design calculation model for sewage sludge drying greenhouse is developed in a way that it can be adapted for any other locations by replacing the actual sludge characteristics and meteorological data.

AB - Rapidly increasing amounts of wastewater and solid waste exert pressure on urban disposal systems in the megacities of emerging economies, of which organic residues like sewage sludge pose a major challenge. Local management approaches with the volume reduction of sewage sludge, therefore, are an attractive option for urban areas. This paper investigated sewage sludge drying characteristics and elaborated on the theoretical background of designing a sludge-drying greenhouse for its volume reduction, as an alternative option in comparison to costly mechanical or thermal dewatering/ pretreatment process. The vapor balance equations are used to calculate evaporation rate where the multiplicative model is applied for the prediction of humidity ratio differences. Estimation of design parameters for a sludge-drying greenhouse is conducted for an example of sub-tropical Indian climate conditions. Especially the case study is presented based on the actual data from the sewage sludge generation at Infosys IT-Complex campus in Bangalore city with its local meteorological information. A sensitivity analysis has also been performed & presented to see the impacts of one drying parameter on the others and vice-versa. This design calculation model for sewage sludge drying greenhouse is developed in a way that it can be adapted for any other locations by replacing the actual sludge characteristics and meteorological data.

M3 - Conference contribution

SP - 36

EP - 50

BT - Proceedings 12th Hanseatic India Colloquium, Germany

Y2 - 7 April 2022 through 7 April 2022

ER -