In order to clarify the effect of biochar-polylactic acid (PLA) composite on reductive dechlorination of HCB in paddy soils, an anaerobic incubation experiment was conducted with four treatments of Sterile control, Control, Biochar, and Biochar-PLA in Hydragric Acrisols (Ac) and Gleyi-Stagnic Anthrosols (An). The results showed that in Ac, biochar addition significantly promoted HCB degradation during the whole incubation period, but biochar-PLA composite inhibited HCB dechlorination due to the low soil pH in the early period and then accelerated HCB degradation while soil pH climbed to nearly neutral. The dechlorination rate of HCB in An was: Biochar-PLA > Biochar > Control > Sterilization control. The degradation rate of HCB in An was faster than in Ac, due to the higher iron content and neutral pH condition in An. The results indicated that biochar-PLA composite promoted the reductive dechlorination of HCB efficiently in paddy soil under nearly neutral pH condition.

为了阐明生物炭-聚乳酸（PLA）复合物对稻田土壤中六氯苯还原性脱氯的影响，我们进行了厌氧温育实验，其中包括四种处理，分别是无菌控制，对照，生物炭和生物炭-聚乳酸在水力A粉中的使用）和Gleyi-Stagnic人为气溶胶（An）。结果表明，在Ac中，生物炭的添加在整个培养过程中均显着促进了HCB的降解，但是由于早期的土壤pH值较低，biochar-PLA复合物抑制了HCB的脱氯，然后在土壤pH升高至接近中性时加速了HCB的降解。An中HCB的脱氯速率为：Biochar-PLA> Biochar>对照>灭菌对照。由于An中较高的铁含量和中性pH条件，An中HCB的降解速率比Ac中快。