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Fat recovery from primary sludge

lab scale research in fat recovery from DAF sludge of slaughterhouses

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Fat recovery from primary sludge

lab scale research in fat recovery from DAF sludge of slaughterhouses

Rechten: Alle rechten voorbehouden

Samenvatting

The treatment and disposal of dissolved air flotation (DAF) sludge from slaughterhouses is an expensive and environmentally sensitive problem. Therefore, fat recovery from high fat content sludge of slaughterhouses not only can reduce sludge disposal costs, but also could provide a revenue stream to slaughterhouse plants. The aim of the study is to develop a cost-efficient system, which can separate slaughterhouse sludge into fat, water and solids. Two concept designs were tested on a lab scale. The experimental setup with a laboratory centrifuge was chosen to investigate the effects of temperature and pH on fat recovery efficiency. Experiment was carried out to test sludge separation at three different temperatures: 50°C;70°C and 90°C. Another experiment was conducted to test the sludge separation at different pH: pH2.5; pH4; pH5.5 (original pH); pH8 and pH10. After centrifugation, the sludge was separated into four phases, which are fat phase, floated solids phase, water phase and settled solids phase. The lab results showed that a higher temperature did not result in higher fat recovery efficiency. Because the floated solids formed a layer in between the fat and water phases, some oil-droplets were “trapped” into the layer and resulted in low fat recovery efficiency. The highest fat recovery efficiency was at pH8, which recovered about 39% of the total fat content, but fat reacted with the base and emulsified in the water phase. At the end, 90°C is recommended for heating process, because recovered fat should be free from pathogenic microorganisms. Increasing or lowering the pH of sludge with a base or acid is not recommended, because it might arise concerns on recovered fat quality and metal deterioration of equipment Further research could involve different separation techniques and chemical aids to improve the fat recovery efficiency.

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OrganisatieHZ University of Applied Sciences
OpleidingWatermanagement/ Aquatische Ecotechnologie
AfdelingDelta Academy
PartnersNijhuis Water Technology, Doetinchem
Datum2014-08-28
TypeBachelor
TaalEngels

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