Sewage Sludge Management

Scientific approach and conceptual design of a solar sludge-drying greenhouse for India

verfasst von

Moni Mohan Mondal, Rahul Ramesh Nair, Dirk Weichgrebe

Abstract

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.

Organisationseinheit(en)

Institut für Siedlungswasserwirtschaft und Abfalltechnik

Typ

Aufsatz in Konferenzband

Seiten

36-50

Anzahl der Seiten

15

Publikationsdatum

2022

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

Ziele für nachhaltige Entwicklung

SDG 11 – Nachhaltige Städte und Gemeinschaften, SDG 12 – Verantwortungsvoller Konsum und Produktion, SDG 13 – Klimaschutzmaßnahmen

Elektronische Version(en)

http://cedindia.org/wp-content/uploads/2023/05/Proceedings12th-Hanseatic-India-Colloquium-GermanySolid-Waste-Managementan-Indo-German-Dialogue.pdf (Zugang: Offen)