Within the authors biochemenergy project (www.biochemenergy.it) urban biowastes have been proven source of bio-based products for many uses. Indeed, soluble bio-organic susbtances (SOS) isolated from urban refuse matter processed by anaerobic and aerobic digestion have good surfactant properties and perform in several chemical technological applications as well as or better than commercial synthetic surfactants from non-renewable sources. The paper will report the most recent results obtained by isolating SOS from different urban biowastes and testing their application in the remediation of soil contaminated by organics and metals from anthropogenic sources. A new process will be described which comprises washing the polluted soil with aqueous biosurfactant solution, treating the recovered solutions by chemical and/or chemical-physical means to separate the pollutant concentrate and obtain clean water for further uses. Figure 1 reports typical data obtained in washing soil contaminated by polycyclic aromatic hydrocarbons (PAH) with aqueous SOS isolated from different biowastes available in metropolitan areas: i.e. the digestate (FORSUD) containing residual lignocellulosic fraction recovered from the biogas production reactor fed with the organic humid fraction of urban residues, and the composts obtained from the following residue mixes:. CVDF from FORSUD, urban gardening and park trimming residues (V), and sewage sludge (F) mix; CVD form V and FORSUD mix; CV from V only. By comparison, the results obtained with commercial Triton are also reported. The data show that Triton is more efficient than the investigated SOS by over 2x factor. Also, all SOS seemed to perform similarly, except for FORSUD exhibiting the lowest extraction efficiency. For all washing solutions, total organic C data demonstrated that no significant or major depletion of biosurfactants or Triton occurs in the washing solutions after completion of the washing trials. However, it was found that PAH removal from the recovered SOS washing solutions was easily achieved at over 99 % level, whereas no or much less PAH removal could be achieved from the recovered Triton washing solution under the same experimental conditions.
Refuse Biosurfactants for Remediation of Polluted Soil
MONTONERI, Enzo;TOMASSO, LORENZO;GINEPRO, Marco;TABASSO, Silvia
2012-01-01
Abstract
Within the authors biochemenergy project (www.biochemenergy.it) urban biowastes have been proven source of bio-based products for many uses. Indeed, soluble bio-organic susbtances (SOS) isolated from urban refuse matter processed by anaerobic and aerobic digestion have good surfactant properties and perform in several chemical technological applications as well as or better than commercial synthetic surfactants from non-renewable sources. The paper will report the most recent results obtained by isolating SOS from different urban biowastes and testing their application in the remediation of soil contaminated by organics and metals from anthropogenic sources. A new process will be described which comprises washing the polluted soil with aqueous biosurfactant solution, treating the recovered solutions by chemical and/or chemical-physical means to separate the pollutant concentrate and obtain clean water for further uses. Figure 1 reports typical data obtained in washing soil contaminated by polycyclic aromatic hydrocarbons (PAH) with aqueous SOS isolated from different biowastes available in metropolitan areas: i.e. the digestate (FORSUD) containing residual lignocellulosic fraction recovered from the biogas production reactor fed with the organic humid fraction of urban residues, and the composts obtained from the following residue mixes:. CVDF from FORSUD, urban gardening and park trimming residues (V), and sewage sludge (F) mix; CVD form V and FORSUD mix; CV from V only. By comparison, the results obtained with commercial Triton are also reported. The data show that Triton is more efficient than the investigated SOS by over 2x factor. Also, all SOS seemed to perform similarly, except for FORSUD exhibiting the lowest extraction efficiency. For all washing solutions, total organic C data demonstrated that no significant or major depletion of biosurfactants or Triton occurs in the washing solutions after completion of the washing trials. However, it was found that PAH removal from the recovered SOS washing solutions was easily achieved at over 99 % level, whereas no or much less PAH removal could be achieved from the recovered Triton washing solution under the same experimental conditions.
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