Abstract
This paper presents the methods for recovery of treated sludge: technological valorisation, agricultural valorization, energy recovery, gasification, pyrolysis, supercritical oxidation of water, obtaining the material for plastering, obtaining bricks. These technologies are biology-based technologies (advanced anaerobic digestion strategies and bio-drying) and heat-based technologies (gasification, pyrolysis and supercritical water processing).
Highlights
This paper presents the methods for recovery of treated sludge: technological valorisation, agricultural valorization, energy recovery, gasification, pyrolysis, supercritical oxidation of water, obtaining the material for plastering, obtaining bricks
The types of sludge from waste water treatment are: primary sludge resulting from mechanical treatment; secondary sludge resulting from the biological treatment step; mixed sludge resulting from the primary sludge mixture and after the secondary decantation obtained by introducing the excess sludge into the mechanical treatment stage; precipitation sludge resulting from the physico-chemical treatment of water by the addition of neutralizing, precipitation, coagulation-flocculating agents
The sludge from sewage treatment plants has a high water content of up to 97%, which can be reduced by 7080% by centrifugation, which is a condition for both transport and storage or disposal [6, 7]
Summary
CARMEN OTILIA RUSANESCU1, MARIN RUSANESCU2*, COSMIN JINESCU3* ION DURBACA3 1 Politehnica University of Bucharest, Faculty of Engineering of Biotechnical Systems, Romania, 313 Splaiul Independentei, 060042, Bucharest, Romania 2 Valplast Industrie, 9 Preciziei Blvd., 062202, Bucharest, Romania 3 Politehnica University of Bucharest, Faculty of Mechanical Engineering, 313 Splaiul Independentei , 060042, Bucharest, Romania. This paper presents the methods for recovery of treated sludge: technological valorisation, agricultural valorization, energy recovery, gasification, pyrolysis, supercritical oxidation of water, obtaining the material for plastering, obtaining bricks. These technologies are biology-based technologies (advanced anaerobic digestion strategies and bio-drying) and heat-based technologies (gasification, pyrolysis and supercritical water processing). The recovery and re-use of waste resulting from the treatment of wastewater from industrial processes eliminates the negative impact on the environment and human health [5, 9, 13, 15,16,17, 3, 24,25,26,27]
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