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Characterization Sludge from Drying Area and Sludge Drying Bed in Sludge Treatment Plant Surabaya City for Waste to Energy Approach
 
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1
Sanitary Engineering Laboratory, Study Program of Civil Engineering, Faculty of Engineering, Universitas Sebelas Maret, Jalan Ir Sutami 36A, Kentingan, Surakarta, Indonesia
 
2
Department of Environmental Engineering, Faculty of Infrastructure Planning, Universitas Pertamina, Komplek Universitas Pertamina, Jalan Sinabung II, Terusan Simprug, Jakarta 12220, Indonesia
 
3
Department of Fundamental and Applied Sciences, Faculty of Science and Information Technology, University Teknologi PETRONAS, Seri Iskandar, 36210, Perak, Malaysia
 
 
Publication date: 2022-07-01
 
 
Corresponding author
I Wayan Koko Suryawan   

Department of Environmental Engineering, Faculty of Infrastructure Planning, Universitas Pertamina, Komplek Universitas Pertamina, Jalan Sinabung II, Terusan Simprug, Jakarta 12220, Indonesia
 
 
J. Ecol. Eng. 2022; 23(7):268-275
 
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ABSTRACT
Sludge Treatment Plant (STP) in Surabaya produces solid waste in the form of sludge. STP in Surabaya provides for Solid Separation Chamber (SSC), equalization unit, Oxidation Ditch (OD), final clarifier, distribution unit, polishing pond, sludge Drying Area (DA), Sludge Drying Bed (SDB), and reservoirs. Sludge waste generation is usually collected in DA and SDB units. This sludge is usually reprocessed for the recycling process, one of which has been developed is waste to energy with a thermochemical process. The difference between these two units is that DA is sludge from preliminary treatment while SDB is sludge from secondary treatment, usually producing microbial biomass. This study aimed to evaluate the sludge produced by the two processing units as solid fuel. The water content of the DA sample is lower because the DA unit has mechanical processing, which separates solids from water. The results of the proximate test resulted in a significant difference between the SDB and DA units. The caloric value, water, ash, and fixed carbon values are significant (<0.05), while the volatile values differ for DA and SBD units. This shows that different treatment is needed for each unit to be appropriately processed as fuel.
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