Printing Ink Wastewater Treatment Using Hydrodynamic Cavitation and Coagulants/Flocculants

Charikleia Zampeta; Chrysanthi Paparouni; Andreas Tampakopoulos; Zacharias Frontistis; Nikolina Charalampous; Stefanos Dailianis; P G Koutsoukos; C A Paraskeva; Dimitris V Vayenas

doi:10.1016/j.jenvman.2022.115975

Printing Ink Wastewater Treatment Using Hydrodynamic Cavitation and Coagulants/Flocculants

J Environ Manage. 2022 Nov 1:321:115975. doi: 10.1016/j.jenvman.2022.115975. Epub 2022 Aug 19.

Authors

Charikleia Zampeta¹, Chrysanthi Paparouni², Andreas Tampakopoulos², Zacharias Frontistis³, Nikolina Charalampous⁴, Stefanos Dailianis⁴, P G Koutsoukos⁵, C A Paraskeva⁵, Dimitris V Vayenas⁶

Affiliations

¹ Department of Chemical Engineering, University of Patras, Rio, GR-26504, Patras, Greece. Electronic address: charazampeta95@gmail.com.
² Department of Chemical Engineering, University of Patras, Rio, GR-26504, Patras, Greece.
³ Department of Chemical Engineering, University of Western Macedonia, GR-50100, Kozani, Greece.
⁴ Department of Biology, Section of Animal Biology, School of Natural Sciences, University of Patras, GR-26500, Patras, Greece.
⁵ Department of Chemical Engineering, University of Patras, Rio, GR-26504, Patras, Greece; Institute of Chemical Engineering and High Temperature Chemical Processes (FORTH/ ICE-HT), Stadiou Str., Platani, GR-26504, Patras, Greece.
⁶ Department of Chemical Engineering, University of Patras, Rio, GR-26504, Patras, Greece; Institute of Chemical Engineering and High Temperature Chemical Processes (FORTH/ ICE-HT), Stadiou Str., Platani, GR-26504, Patras, Greece. Electronic address: dvagenas@upatras.gr.

PMID: 35988399
DOI: 10.1016/j.jenvman.2022.115975

Abstract

Raw printing ink wastewater (PIW) was treated with various inorganic coagulants and organic flocculants (anionic and cationic polyacrylamides). These processes were also examined as post treatment step following hydrodynamic cavitation. Treatment effectiveness was assessed through color, chemical oxygen demand (COD) and total suspended solids (TSS) removal. The addition of 4500 mg L^-1 polyaluminum chloride coagulant in undiluted PIW (COD: 17000 mg L^-1) resulted in 99% color removal, 96% COD and TSS removal, after settling for 2 h. The addition of 10 mg L^-1 of anionic polyacrylamides in the sample reduced settling time to only 5 min, with concomitant 96-98% removal efficiency. The addition of a 4 min hydrodynamic cavitation pretreatment step reduced coagulant addition by 33%, for the treatment of undiluted PIW (with 10 mg L^-1 anionic polyacrylamide), while removals were ranged between 96 and 98%. Economic analysis for the undiluted PIW showed that costs were reduced by ca. 20% with the hydrodynamic cavitation pretreatment step. Moreover, sludge characterization showed the presence of maghemite, aluminum chloride and potassium aluminum silicate. Finally, toxicity tests revealed a significant attenuation of the toxic potential of undiluted PIW, thus indicating the enhanced efficiency of the proposed combined process (hydrodynamic cavitation and coagulation/flocculation).

Keywords: Coagulation; Flocculation; Hydrodynamic cavitation; Operation cost; Sludge characterization; Toxicity.

MeSH terms

Anions
Flocculation
Hydrodynamics
Ink
Printing, Three-Dimensional
Waste Disposal, Fluid* / methods
Wastewater / chemistry
Water Purification*

Substances

Anions
Waste Water