Modified tannins and their application in wastewater treatment | Zendy

William Arismendi | Zendy; Andrés E. Ortiz-Ardila | Zendy; Cabrera Delgado | Zendy; Lorena Lugo | Zendy; Luis Gonzalo Sequeda-Castañeda | Zendy; Crispín A. Celis-Zambrano | Zendy

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Modified tannins and their application in wastewater treatment

Author(s) -

William Arismendi,

Andrés E. Ortiz-Ardila,

Cabrera Delgado,

Lorena Lugo,

Luis Gonzalo Sequeda-Castañeda,

Crispín A. Celis-Zambrano

Publication year - 2018

Publication title -

water science and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.406

H-Index - 137

eISSN - 1996-9732

pISSN - 0273-1223

DOI - 10.2166/wst.2018.336

Subject(s) - flocculation , diethanolamine , chemistry , ammonium chloride , tannin , chromatography , factorial experiment , wastewater , ammonium , ethanolamine , chloride , nuclear chemistry , amine gas treating , turbidity , extraction (chemistry) , pulp and paper industry , organic chemistry , waste management , food science , statistics , oceanography , mathematics , engineering , geology

The bio-flocculants used in this study were synthesised by the Mannich reaction, which includes three reagents: a substrate (tannin extracts of Acacia, Quebracho, and Castanea), formaldehyde, and an amine derivative (ethanolamine, diethanolamine, ammonium chloride). Nine natural flocculants were prepared by combining extracts and amines; these products were evaluated in three different wastewater samples in two experimental phases. In phase I, five physicochemical parameters were analysed. From the data obtained, a multivariate, completely randomised design (CRD-Manava) was used, with a factorial arrangement and mean plots. In phase II, the three bio-flocculants with the most statistically significant responses and their mixtures were examined, evaluating 14 biological and physicochemical parameters. Statistical analysis was guided in this phase by CRD blocks, finding a significant removal in the physicochemical parameters analysed in the different types of wastewater and obtaining removal rates between 50 and 90%, depending on the parameter. At the end of both phases, the bio-flocculants acacia-ammonium chloride and quebracho-diethanolamine were the most efficient in the removal of turbidity (34-99%), true colour (93-100%) and total solids (12-99%). In addition, the natural flocculants showed low mutagenicity index (MI: 0.33-0.93) compared to aluminium sulphate (MI: 4.87-8.81).

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