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Energy and cost evaluation in total treatment system of sewage and waste
Author(s) -
Par P. S.,
Ito K.,
Suzuki Y.
Publication year - 1984
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4440080202
Subject(s) - waste management , sewage treatment , aeration , environmental science , anaerobic digestion , sewage sludge , sewage , waste treatment , sewage sludge treatment , engineering , methane , chemistry , organic chemistry
This paper discusses a total treatment system which is designed not only to treat waste and sewage discharged in a new town but also to use energy which is recovered from these waste materials as effectively as possible. Various alternative systems are planned by taking realization possibilities of new technologies and environmental impact into consideration, and their energy efficiencies and economy are investigated comprehensively. From the investigation, the following system is selected as the optimal one: In the sewage treatment system, an activation method using an ultradeep aeration tank is adopted as the aeration method, a method using hypochlorite as that for disinfection, and an anaerobic digestion system as that for sludge treatment. In the waste disposal system, a combined heat and power system with a pyrolysis furnace of rotary kiln type is adopted. In this total treatment system, the waste disposal system uses both the recovered gas and residues of sludge after methane fermentation in the sewage treatment process, and the sewage treatment process gets both steam and electricity which are generated by using the pyrolysis gas obtained in the pyrolysis furnace. As a result, it was made clear that the proposed total treatment system makes it possible not only to be operated by steam and electricity produced within the system itself, but also to transmit surplus power to the outside of the system.