Brine recovery from hypersaline wastewaters from table olive processing by combination of biological treatment and membrane technologies

Abstract:

The fermentation brines from table olive processing (FTOP) are hypersaline effluents (conductivities higher than 75 mS cm⁻¹) with high organic matter concentrations (COD around 10 g L⁻¹), which also include phenolic compounds (between 700 and 1500 mg TY·L⁻¹). In this work, an integrated process for the FTOP reuse as brine in the table olive processing has been evaluated. This integrated process consisted of a biological treatment followed by a membrane system, which included ultrafiltration (UF) plus nanofiltration (NF). The biological treatment was carried out by 6 L laboratory sequencing batch reactor (SBR). UF and NF were performed in laboratory plants for flat membranes of 0.0125 and 0.0072 m², respectively. Each stream generated during the FTOP treatment (SBR effluent, and UF and NF permeates) were evaluated. The SBR eliminated around 80% of COD and 71% of total phenols concentration. In the final NF permeate the COD concentration was lower than 125 mg L⁻¹; while the turbidity, colour and phenolic compounds, were completely removed.

Año de publicación:

2017

Keywords:

• Ultrafiltration
• Biological treatment
• nanofiltration
• Hipersaline effluents
• phenolic compounds

Fuente:

scopus