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Printing Ink Wastewater Treatment Using Hydrodynamic Cavitation and Coagulants/Flocculants
Charikleia Zampeta1, Chrysanthi Paparouni1, Andreas Tampakopoulos1
1Department of Chemical Engineering, University of Patras, Rio, GR-26504, Patras, Greece.
Journal of Environmental Management
|August 21, 2022
Summary
Hydrodynamic cavitation pretreatment significantly enhances printing ink wastewater treatment, reducing coagulant use by 33% and costs by 20%. This combined process effectively removes color, chemical oxygen demand, and total suspended solids, while also reducing toxicity.
Area of Science:
- Environmental Chemistry
- Water Treatment Technologies
- Process Engineering
Background:
- Printing ink wastewater (PIW) poses significant environmental challenges due to high pollutant loads.
- Conventional treatment methods often struggle with efficient removal of color, chemical oxygen demand (COD), and total suspended solids (TSS).
- Hydrodynamic cavitation (HC) is an emerging advanced oxidation process with potential for wastewater treatment enhancement.
Purpose of the Study:
- To evaluate the effectiveness of inorganic coagulants and organic flocculants in treating raw printing ink wastewater.
- To investigate the synergistic effects of hydrodynamic cavitation as a pretreatment step before coagulation/flocculation.
- To assess the economic viability and sludge characteristics of the combined treatment process.
Main Methods:
- Treatment of undiluted PIW using polyaluminum chloride (PAC) and anionic polyacrylamides.
- Application of a 4-minute hydrodynamic cavitation pretreatment step.
- Assessment of treatment efficiency via color, COD, and TSS removal.
- Sludge characterization and toxicity testing.
Main Results:
- Polyaluminum chloride achieved 99% color and 96% COD/TSS removal, while anionic polyacrylamide reduced settling time to 5 minutes with 96-98% removal.
- Hydrodynamic cavitation pretreatment reduced coagulant dosage by 33% and treatment costs by approximately 20%.
- The combined HC and coagulation/flocculation process demonstrated high removal efficiencies (96-98%) and significantly reduced wastewater toxicity.
Conclusions:
- Hydrodynamic cavitation pretreatment is a highly effective strategy for enhancing the coagulation/flocculation of printing ink wastewater.
- The combined process offers a cost-effective and efficient solution for PIW treatment, with improved sludge properties.
- The study confirms the significant reduction in the toxic potential of PIW, highlighting the environmental benefits of the integrated approach.
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