Integrating the Fenton's Process with Biofiltration by Corbicula fluminea to Reduce Chemical Oxygen Demand of Winery Effluents

Abstract

The discharge of poorly decontaminated winery wastewater remains a serious environmental problem in many regions, and the industry is welcoming improved treatment methods. Here, an innovative decontamination approach integrating Fenton's process with biofiltration by Asian clams is proposed. The potential of this approach was assessed at the pilot scale using real effluent and by taking an actual industrial treatment system as a benchmark. Fenton peroxidation was observed to remove 84% of the effluent's chemical oxygen demand (COD), reducing it to 205 mg L. Subsequent biofiltration decreased the effluent's COD to approximately zero, well below the legal discharge limit of 150 mg L, in just 3 d. The reduction of the effluent's organic load through Fenton's process did not decrease its toxicity toward , but the effluent was much less harmful after biofiltration. The performance of the treatment proposed exceeded that of the integrated Fenton's process-sequencing batch reactor design implemented in the winery practice, where a residence time of around 10 d in the biological step typically results in 80 to 90% of COD removal. The method proposed is effective and compatible with typical winery budgets and potentially contributes to the management of a nuisance species.

A global synthesis of ecosystem services provided and disrupted by freshwater bivalve molluscs

“…3E; Binelli et al ., 2014; Magni et al ., 2015). In Portugal, C. fluminea was shown to be able to assist in the remediation of acid mine drainage, as well as olive oil mill and winery wastewaters (Rosa et al ., 2014; Pipolo et al ., 2017; Ferreira et al ., 2018; Domingues et al ., 2020). One of the few such records on native unionid species from outside Asia is that of D. chilensis alleviating environmental effects of a fish aquaculture in Chile by removing nutrients and organic matter from the water (Parada et al ., 2008).…”

Biotreatment of Winery Wastewater Using a Hybrid System Combining Biological Trickling Filters and Constructed Wetlands

“…A literature review reveals that most research concentrates on WW treatment using a single treatment method, while only recent research works have demonstrated a hybrid approach combining two or more treatment methods. Pipolo et al [21] showed that mild Fenton's treatment with biofiltration by Asian clams as a secondary treatment step can completely remove the Chemical Oxygen Demand (COD) of WWs, the concentration of which however was rather low (about 1267 ± 101 mg/L). A similar treatment system was also examined by Ferreira et al [22], who achieved COD removal near 100% from a WW with a relatively low initial COD concentration (up to 2280 mg/L).…”