Water resources and the environment may be severely impacted by the demand for and disposal of water. Reusing water is a crucial component of the answer for long-term water security and economic development as industrial activity increases. Through advances in digital and circular water usage, the AquaSPICE project, funded by the European Union's Horizon 2020 research and innovation initiative, aims to improve the sustainability of process industries and enabling industrial water recovery/treatment, to achieve a significant reduction of the current use of freshwater resources. In particular, one of the largest and oldest industrial sites in Italy is the Rosignano Solvay facility, which is included in the case study. In order to limit freshwater intake and prevent its release to the sea, the wastewater produced during the manufacturing of peroxide and peracetic acid is studied in relation to Solvay Industry and its reuse in the cooling towers located in the chemical plant. The aim of this thesis is to monitor biological treatment through an SBR to get design and operational parameters for the installation of a pilot plant at Solvay plant site to treat industrial wastewater by innovative and sustainable processes. Specific objectives of this SBR study were to investigate the removal of COD, partially recalcitrant, nitrates, and analyze their removals with different conditions of MLSS concentration, COD/N, DO concentration and the use of two external carbon sources. What emerges is that the biological treatment proved to be effective on nitrate removal, while for COD was obtained a removal of 75% even with a low air flowrate. Change of MLSS concentration from 3.5 to 6 g/L have not demonstrated particular improvement on COD removal rate and on nitrates removal, also because the quality of COD changed during the experimental activity depending on the batches received by Solvay Chimica Italia. The denitrification reaction with external carbon source occurred with a SDNR of 1.1 mg N-NO3/gMLVSS·h with COD/N of 3 while the process is not improved with higher ratio. Solvay wastewater has an alkalinity of approximately 100 mg/L, while the effluent from the SBR has values of total alkalinity up to 1000 mgCaCO3/L due to the post anoxic denitrification which produce it. The jar test can increase COD removal by up to 21 % with coagulant (122 mg Al2O3) and flocculant (10 mg of active principle). The heating treatment have not shown a significant increase in the removal of COD concentration. The best performances are achieved using high dosages of flocculant while the quantity of coagulant have not a visible significance. Stripping tests showed the possible presence of volatile compounds in Solvay wastewater that are removed during oxidation phase up to 23% if heated to 40 °C. Finally, UV-Visible and fluorescence spectroscopy was investigated to get suitable parameter for the on-line monitoring of the treatment process. Particularly, fluorescence spectroscopy offered the possibility to differentiate the biodegradable and recalcitrant fractions of dissolved organic matter offering important suggestion for the monitoring of the different components of this industrial COD in real-time.
Water resources and the environment may be severely impacted by the demand for and disposal of water. Reusing water is a crucial component of the answer for long-term water security and economic development as industrial activity increases. Through advances in digital and circular water usage, the AquaSPICE project, funded by the European Union's Horizon 2020 research and innovation initiative, aims to improve the sustainability of process industries and enable industrial water recovery/treatment, to achieve a significant reduction of the current use of freshwater resources. In particular, one of the largest and oldest industrial sites in Italy is the Rosignano Solvay facility, which is included in the case study. In order to limit the freshwater intake and prevent its release to the sea, the wastewater produced during the manufacturing of peroxide and peracetic acid is studied in relation to Solvay Industry and its reuse in the cooling towers located in the chemical plant. The aim of this thesis is to monitor biological treatment through an SBR to get design and operational parameters for the installation of a pilot plant at Solvay plant site to treat industrial wastewater by innovative and sustainable processes. Specific objectives of this SBR study were to investigate the removal of COD, partially recalcitrant, nitrates, and analyze their removals with different conditions of MLSS concentration, COD/N, DO concentration and the use of two external carbon sources. What emerges is that the biological treatment proved to be effective on nitrate removal, while for COD was obtained a removal of 75% even with a low air flowrate. Change of MLSS concentration from 3.5 to 6 g/L have not demonstrated particular improvement on COD removal rate and on nitrates removal, also because the quality of COD changed during the experimental activity depending on the batches received by Solvay Chimica Italia. The denitrification reaction with external carbon source occurred with an SDNR of 1.1 mg N-NO3/gMLVSS·h with COD/N of 3 while the process is not improved with higher ratio. Solvay wastewater has an alkalinity of approximately 100 mg/L, while the effluent from the SBR has values of total alkalinity up to 1000 mgCaCO3/L due to the post-anoxic denitrification which produces it. The jar test can increase COD removal by up to 21 % with coagulant (122 mg Al2O3) and flocculant (10 mg of active principle). The heating treatment has not shown a significant increase in the removal of COD concentration. The best performances are achieved using high dosages of flocculant while the quantity of coagulant have not a visible significance. Stripping tests showed the possible presence of volatile compounds in Solvay wastewater that are removed during the oxidation phase up to 23% if heated to 40 °C. Finally, UV-Visible and fluorescence spectroscopy was investigated to get a suitable parameters for the online monitoring of the treatment process. Particularly, fluorescence spectroscopy offered the possibility to differentiate the biodegradable and recalcitrant fractions of dissolved organic matter offering important suggestion for the monitoring of the different components of this industrial COD in real-time.
Treatment of industrial wastewater from peroxides production within Horizon2020 AquaSPICE: lab scale studies
D'AMICO, LUIGI FEDERICO
2021/2022
Abstract
Water resources and the environment may be severely impacted by the demand for and disposal of water. Reusing water is a crucial component of the answer for long-term water security and economic development as industrial activity increases. Through advances in digital and circular water usage, the AquaSPICE project, funded by the European Union's Horizon 2020 research and innovation initiative, aims to improve the sustainability of process industries and enabling industrial water recovery/treatment, to achieve a significant reduction of the current use of freshwater resources. In particular, one of the largest and oldest industrial sites in Italy is the Rosignano Solvay facility, which is included in the case study. In order to limit freshwater intake and prevent its release to the sea, the wastewater produced during the manufacturing of peroxide and peracetic acid is studied in relation to Solvay Industry and its reuse in the cooling towers located in the chemical plant. The aim of this thesis is to monitor biological treatment through an SBR to get design and operational parameters for the installation of a pilot plant at Solvay plant site to treat industrial wastewater by innovative and sustainable processes. Specific objectives of this SBR study were to investigate the removal of COD, partially recalcitrant, nitrates, and analyze their removals with different conditions of MLSS concentration, COD/N, DO concentration and the use of two external carbon sources. What emerges is that the biological treatment proved to be effective on nitrate removal, while for COD was obtained a removal of 75% even with a low air flowrate. Change of MLSS concentration from 3.5 to 6 g/L have not demonstrated particular improvement on COD removal rate and on nitrates removal, also because the quality of COD changed during the experimental activity depending on the batches received by Solvay Chimica Italia. The denitrification reaction with external carbon source occurred with a SDNR of 1.1 mg N-NO3/gMLVSS·h with COD/N of 3 while the process is not improved with higher ratio. Solvay wastewater has an alkalinity of approximately 100 mg/L, while the effluent from the SBR has values of total alkalinity up to 1000 mgCaCO3/L due to the post anoxic denitrification which produce it. The jar test can increase COD removal by up to 21 % with coagulant (122 mg Al2O3) and flocculant (10 mg of active principle). The heating treatment have not shown a significant increase in the removal of COD concentration. The best performances are achieved using high dosages of flocculant while the quantity of coagulant have not a visible significance. Stripping tests showed the possible presence of volatile compounds in Solvay wastewater that are removed during oxidation phase up to 23% if heated to 40 °C. Finally, UV-Visible and fluorescence spectroscopy was investigated to get suitable parameter for the on-line monitoring of the treatment process. Particularly, fluorescence spectroscopy offered the possibility to differentiate the biodegradable and recalcitrant fractions of dissolved organic matter offering important suggestion for the monitoring of the different components of this industrial COD in real-time.| File | Dimensione | Formato | |
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https://hdl.handle.net/20.500.12075/11903