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Sewage sludge solubilization by high-pressure homogenization
Yuxuan Zhang1, Panyue Zhang, Jianbin Guo
1Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China.
Summary
High-pressure homogenization (HPH) effectively solubilizes sludge organics, reducing volatile suspended solids (VSS) and increasing soluble chemical oxygen demand (SCOD). Optimal energy efficiency was achieved at 30 MPa with one cycle for 2.48% total solids sludge.
Area of Science:
- Environmental Engineering
- Wastewater Treatment Technologies
- Biomass Processing
Background:
- Sludge solubilization is crucial for efficient wastewater treatment and resource recovery.
- High-pressure homogenization (HPH) is a promising mechanical treatment for altering sludge properties.
- Understanding the impact of HPH parameters on sludge characteristics is essential for process optimization.
Purpose of the Study:
- To investigate sludge solubilization and solid reduction using high-pressure homogenization (HPH).
- To analyze the effects of homogenization pressure and cycles on organic matter solubilization.
- To determine the most energy-efficient HPH operating conditions for sludge treatment.
Main Methods:
- Sludge samples with varying total solids (TS) content were treated using HPH.
- Homogenization pressure (20-80 MPa) and cycles (1-4) were systematically varied.
- Sludge volatile suspended solids (VSS), total suspended solids (TSS), and soluble chemical oxygen demand (SCOD) were measured.
Main Results:
- HPH treatment significantly reduced VSS and TSS, with VSS reduction accounting for ~86% of TSS reduction.
- Increased homogenization pressure and cycles enhanced sludge organics solubilization, including proteins and polysaccharides.
- A consistent linear relationship was observed between SCOD solubilization and VSS reduction across various HPH conditions.
Conclusions:
- HPH is effective in reducing sludge solids and solubilizing organic matter.
- Protein solubilization was more pronounced than polysaccharide solubilization.
- The most energy-efficient HPH operation for sludge treatment was identified at 30 MPa and one cycle for sludge with 2.48% TS.
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