Journal of Environmental Biology
pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP
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Abstract - Issue 2 2012, 33 (2) Back
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A novel method of sludge
pretreatment using the combination of alkalis Author Details |
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J. |
Department
of Civil Engineering, |
|
Uan Do Khac |
Department
of Civil and Environmental Engineering, Chunchundong, Jangan-gu, |
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S. Adish Kumar |
Department
of Civil Engineering, |
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(Corresponding author) |
Department
of Civil and Environmental Engineering, Chunchundong, Jangan-gu, e-mail:
yeom@skku.edu |
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Department
of Civil Engineering, |
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Publication Data Paper received: 08 September 2010 Revised received: 25 February 2011 Accepted: 21 April 2011 |
Abstract The present study aims to utilise the
advantage of higher sludge solubilisation potential
of sodium hydroxide (NaOH) and sludge management
properties of lime to achieve sludge pretreatment and its subsequent
management. The optimum dosage and time required for sludge pretreatment
using NaOH was found to be 1.6 g l-1
and 3 hr, respectively. At the optimized condition, lime was added at varying
concentration (0.3 to 1.6 g l-1) to study its effect on capillary
suction time, soluble chemical oxygen demand (SCOD) release and total
phosphorous (TP) removal. A lime dosage of 0.7g l-1 was found to
be beneficial for soluble chemical oxygen demand (COD) release. When compared
to control, the combination of alkalis (NaOH and
lime) reduced the TP and capillary suction time (CST) in the supernatant of
the sludge. The TP removal was from
100 to 40 mg l-1 and CST reduction was from 1360 to 350 sec,
respectively. The combined alkali pretreatment not only prevent the
subsequent TP increase in the effluent, but also decreased the time to filter
the sludge, thus makes the digested sludge easier to manage. Key
words Sludge pretreatment,
Capillary suction time, Sodium hydroxide, Lime, Phosphorous removal |
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