Coagulation–Flocculation as an Alternative Way to Reduce the Toxicity of the Black Liquor from the Paper Industry: Thermal Valorization of the Solid Biomass Recovered

Juan Domínguez-Robles*, Mª del Valle Palenzuela, Rafael Sánchez, Javier Mauricio Loaiza, Eduardo Espinosa, Antonio Rosal, Alejandro Rodríguez

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Abstract: Pulp and paper mills generate a huge amount of wastewater and some of them, especially non-wood paper mills, do not possess recovery systems. In this research work, the effectiveness of coagulation–flocculation using poly (ethylene oxide), poly aluminium chloride and poly (dimethyl diallyl ammonium chloride) for the treatment of a black liquor obtained from a pulp mill (with wheat straw as the raw material) is reported. Furthermore, the calorific potential of the solid fraction generated after these treatments was investigated with the aim of enhancing this residue. Chemical oxygen demand (COD), turbidity and total solids (TS) were determined in the supernatants obtained from the different coagulation–flocculation processes. The treatment with poly (ethylene oxide) at pH 2.0 achieved the maximum reduction of TS (66%), COD (75%) and Turbidity (95%) in the black liquor and the precipitated solid fraction with the highest calorific value (19.9 MJ/kg). Graphic Abstract: [Figure not available: see fulltext.].

Original languageEnglish
JournalWaste and Biomass Valorization
DOIs
Publication statusPublished - 14 Aug 2019
Externally publishedYes

Keywords

  • Acidification
  • Biorefinery
  • Calorific potential
  • Pulp mill sludge
  • Wastewater treatment

ASJC Scopus subject areas

  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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