PAPERmaking! g FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 1, Number 1, 2015
2. Experimental Section 2.1. Recycled Paper Mill Sludge Sampling
Recycled paper mill sludge (RPMS) was collected from six different paper mills from Malaysia (Figure 1) in sufficient amount for the purposes of characterisation. The six samples were assigned as PM1, PM2, PM3, PM4, PM5 and PM6. Recycled paper mill sludge which was collected from the waste treatment plants of each mills was analysed for physical and chemical characteristics. During the collection, the RPMS were in wet solid form. They were brought to the laboratory, air dried and ground to pass through a 2mm sieve for the analyses of the chemical properties.
Figure 1. Map of the sampling locations in Peninsular Malaysia for the paper mill sludges used in this study. 2.2. Physical and Chemical Characteristics of Paper Mill Sludges The dried paper mill sludges were analysed for moisture content, pH, organic carbon, total N and total heavy metals. The laboratory analyses were performed on the sub-samples, each in five replicates. The pH of the sludge was determined from the supernatant of the mixed sample and distilled water ratio of 1:2.5 using a Beckman Digital pH meter (Beckman Instruments Inc., CA, USA). EC was measured from a solution collected from the saturated paste using the EC meter. Total carbon was measured by the combustion technique [8] using a CR-412 carbon analyser (LECO Corporation, St. Joseph, MI, USA).
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Article 2 – Environment (sludge)
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