Abstract：
The aim of the study was to investigate the effect of the biochar (BC) dose on solvent extractable (Ctot) and freely dissolved (Cfree) polycyclic aromatic hydrocarbons (PAHs) content during co-composting. A significantly better reduction of Σ16 Ctot PAHs after 98 days occurred during composting with BC (for 1% of BC - 44% and for 5% of BC - 23%) than in the control (15%). Despite the relatively high reduction of Ctot PAHs in the experiment with 5% BC rate, the content of the PAHs was still the highest compared to other variants. Regarding Cfree PAHs, 5% rate of BC resulted in the best reduction of PAHs, while the 1% BC dose resulted in a lower reduction of Cfree than the control. For 1% BC, PAHs losses was more effective, and sequestration processes played a less significant role than in the experiment with 5% dose of BC. The total and dissolved organic carbon, and ash were predominantly responsible for Ctot and Cfree losses, and additionally pH for Cfree. The results of the experiment indicate that BC performs a crucial role in composting, affecting the Ctot and Cfree PAHs in the compost but the final effect strictly depends on the BC dose.
摘要：
研究的目的是研究生物炭（BC）剂量对共堆肥过程中溶剂可萃取（Ctot）和自由溶解（Cfree）多环芳烃（PAHs）含量的影响。与对照组（15％）相比，在与BC堆肥的过程中，Σ16CtotPAHs的减少明显更好（BC的1％-44％和BC的5％-23％）。尽管在具有5%BC率的实验中CtotPAHs的降低相对较高,与其他变体相比，PAHs的含量仍然最高。关于游离多环芳烃，5%的BC率导致PAHs的最佳减少，而1%BC剂量导致比对照更低的Cfree减少。对于1%BC，多环芳烃的损失更有效，与使用5％剂量BC的实验相比，隔离过程所起的作用较小。总的和溶解的有机碳，灰主要是造成Ctot和Cfree损失的原因，和另外的pH为Cfree。实验结果表明，BC在堆肥中起着至关重要的作用，影响堆肥中的Ctot和CfreePAHs，但最终效果严格取决于BC剂量。
