The preliminary assessment of the stabilisation of sewage sludge by PFA and related materials

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The preliminary assessment of the stabilisation of sewage sludge by PFA and related materials


Author: Chan, Wing-cheong
Title: The preliminary assessment of the stabilisation of sewage sludge by PFA and related materials
Degree: M.Sc.
Year: 1993
Subject: Sewage sludge digestion
Hong Kong Polytechnic -- Dissertations
Department: Dept. of Civil and Structural Engineering
Pages: 72, [37], [9] leaves of plates : ill. ; 31 cm
Language: English
InnoPac Record:
Abstract: Sewage sludge production in Hong Kong will be dramatically increased in the next decade due to the planned expansion of existing sewage treatment capacity. However, international trend to ban the sea disposal of sewage sludge may make this option to be unlikely continued in the next decade. For land disposal of unstabilised sewage sludge, it may have environmental implications such as odours, leachate and pathogens problems. Hence, stabilisation of sewage sludge before land disposal is one of the development trends for the disposal of sewage sludge. In addition, fuel ash production in Hong Kong will continuously increase due to the increasing demand of electricity. Land reclamation and restoration is considered as a possible long term disposal option for fuel ash. However, dust nuisance during handling of fuel ash should be an environmental concern. In view of the environmental problems of disposing the sewage sludge and fuel ash, a research is proposed to stabilise the sewage sludge by the use of fuel ash and, if required, lime. The research will preliminary assess the stabilisation effect of fuel ash on sewage sludge by reviewing the metals immobilisation and pathogens destruction. Samples will be prepared by mixing the sewage sludge, pulverised fuel ash (PFA) and quicklime for subsequent testings. The testings will include solid content, pH, temperature, total metals, metal leachability and pathogens/bacteria determination. The initial results in this research show that PFA and lime can stabilise the sewage sludge by reducing the metals leachability and destroying the pathogens. Moreover, the mixing of sewage sludge and PFA can solve the operational difficulties during the handling of sewage sludge and PFA. Sewage sludge can suppress the dust problem of PFA and PFA can simultaneously increase the solid content of sewage sludge and hence pre-dewatering of sewage sludge is not required. However, this research should be considered as a starting point for further development of this technology. The process is believed to be feasible and pragmatic and the mixed product will have potential application in agriculture as fertiliser or land application as top soil or fill material.

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