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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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        Abstract - Issue 2 2012, 33 (2)                                                                                                             Back



nstantaneous and historical temperature effects on a-pinene

A novel method of sludge pretreatment using the combination of alkalis

 

Author Details

 

J. Rajesh Banu

Department of Civil Engineering, Anna University of Technology, Tirunelveli - 627 007, India

Uan Do Khac

Department of Civil and Environmental Engineering, SungKyunKwan University, 300,

Chunchundong, Jangan-gu, Suwon, 440-746, Korea

S. Adish Kumar

Department of Civil Engineering, Anna University of Technology, Tirunelveli - 627 007, India

Yeom Ick-Tae??????????

(Corresponding author)

Department of Civil and Environmental Engineering, SungKyunKwan University, 300,

Chunchundong, Jangan-gu, Suwon, 440-746, Korea

e-mail: yeom@skku.edu

S. Kaliappan

Department of Civil Engineering, Anna University of Technology, Tirunelveli- 627007, India

 

 

 

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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