Related Experiment Video
Updated: Jun 3, 2026
15:19
Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor
Published on: October 15, 2015
Sludge treatment reed bed facilities--organic load and operation problems
1Orbicon | Leif Hansen A/S, Ringstedvej 20, DK-4000 Roskilde, Denmark. smni@orbicon.dk
Summary
Sludge dewatering efficiency significantly decreases with higher loss on ignition (LOI) and fat content. Lowering LOI and fat in feed sludge improves dewatering results, achieving higher dry solids in residue.
Area of Science:
- Environmental Engineering
- Waste Management
Background:
- Sludge dewatering is crucial for waste reduction and resource recovery.
- High organic content, indicated by loss on ignition (LOI), and fat/oil concentrations significantly impact dewatering performance.
Purpose of the Study:
- To investigate the relationship between sludge composition (LOI, fat, oil) and dewatering efficiency.
- To determine optimal conditions for maximizing sludge dewatering.
Main Methods:
- Analysis of sludge dewatering rates based on varying loss on ignition (50-76%) and fat/oil concentrations (4,000-30,000 mg/kg ds).
- Correlation of dewatering results (dry solid percentage in residue) with feed sludge characteristics.
Main Results:
- Sludge with 50-65% LOI achieved maximal drainage of 0.008-0.020 L/s/m(2).
- Sludge with >65% LOI showed 5-10 times lower drainage (0.001-0.004 L/s/m(2)).
- High fat (>10,000 mg/kg ds) or LOI (>65%) resulted in sludge residue with ≤10% dry solids; low fat/oil and 50-65% LOI yielded 20-37% dry solids.
Conclusions:
- Dewatering efficiency is inversely correlated with loss on ignition and fat content in sludge.
- Optimizing sludge feed composition by reducing LOI and fat is essential for effective dewatering processes.
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