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生物碳系列性质之六:污染物

发布时间:06-08 23:04 来源: 作者: 阅读:3393 网友评论0

介绍了生物碳中污染物的种类及其他

          Biochar incorporation into soil is expected to enhance overall sorption capacity of soils towards anthropogenic organic contaminants (e.g. PAHs, pesticides and herbicides). Whereas this behaviour may greatly contribute to mitigating toxicity and transport of common pollutants in soil, biochar aging over time may result in leaching and increased bioavailability of such compounds. On the other hand, while the feasibility for reducing mobility of trace contaminants in soil might be beneficial, it might also result in their localised accumulation. Biochar also has the potential to introduce a wide range of hazardous organic compounds (e.g. heavy metals, PAHs) into the soil system, which can be present as contaminants in biochar that has been produced either from contaminated feedstocks or under processing conditions which favour their production. N2O emissions depend on effects of biochar addition on soil hydrology (water-filled pore volume) and associated microbial processes.

          The potential of biochar to be a source of soil contamination needs to be evaluated on a case-by-case basis, not only with concern to the biochar product itself, but also to soil type and environmental conditions. Risk assessment procedures for these compounds need to be re-evaluated on a case-by-case basis, based on bioavailable concentrations (rather than initial concentrations in biochar) and accounting for the influence of NOM on their desorption from biochar over time. This would allow understanding the true implications of their presence in biochar on human, animal and ecosystem health over a wide range of soil conditions, while enabling relation of toxicity to biochar type and safe application rates, as well as feedstock characteristics and pyrolysis conditions, as well as soil type and environmental conditions.

         Preliminary evidence suggests that a tight control on the feedstock materials and pyrolysis conditions might substantially reduce contaminant levels. Some of the potential negative effects can be ‘stopped at the gate’, i.e. by not allowing specific feedstocks that have been proven to be inappropriate, and by regulating pyrolysis conditions to avoid undesirable biochar properties (a compulsory biochar quality assessment and monitoring approach could prove effective). Other potential negative effects on soils, or the wider ecosystem, need to be regulated on the application side, i.e. at the field scale, taking into account the soil properties and processes as well as threats to soil functions.
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