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首页> 外文期刊>Environmental engineering and management journal >TRIPHASIC SLURRY BIOREACTORS FOR THE BIOREMEDIATION OF LINDANE-IMPACTED SOIL UNDER AEROBIC AND ANAEROBIC CONDITIONS
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TRIPHASIC SLURRY BIOREACTORS FOR THE BIOREMEDIATION OF LINDANE-IMPACTED SOIL UNDER AEROBIC AND ANAEROBIC CONDITIONS

机译：三价淤泥生物反应器在好氧和厌氧条件下生物降解林丹的土壤

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摘要

The objective of this study was two-fold: (i) to evaluate the effect of co-substrate supplementation and possible synergistic effect of the indigenous population and a lindane-acclimated inoculum on the removal of lindane in three-phase, aerobic slurry bioreactors (SB), and (ii) to evaluate the effect final electron acceptor (O_2, CO_2 and SO_4 ~(-2), or A, M, and SR, respectively) and supplementation with carbon source (sucrose, 1 and 0 g/L; C or NC, respectively) on the removal of lindane in triphasic lab scale SB. In a first experiment lindane was significantly removed in the first week of operation (55-70%); its reduction further continued at a lower rate. Both factors had a moderately significant effect; on the one hand, sucrose supplementation enhanced the removal of lindane (p ＜ 0.08); on the other hand the indigenous microflora and lindane-acclimated inoculum exhibited some kind of antagonism (p ＜ 0.07), since removals in SB with sterile soil were higher than those with live soil. In a second experiment, there was a significant effect of factor 'electron acceptors' on removal of lindane (p ＜ 0.0001): lindane removal followed the order A ＞ SR ＞ M. Supplementation with sucrose had a significant positive effect (p ＜ 0.004). Main metabolites from lindane degradation were chlorobenzene (CB), 1,2-dichlorobenzene (1,2-DCB) 1,3-dichlorobenzene (1,3-DCB) and 1,2,4-trichlorobenzene (1,2,4-TCB) in aerobic and sulfate reducing slurry bioreactors, only CB and 1,2-DCB were found in methanogenic units. Metabolites were consistent with those reported in aerobic and anaerobic degradation pathways of lindane.
机译：这项研究的目的有两个方面：（i）评估共基质补充的影响以及土著居民和林丹适应接种物对三相好氧浆液生物反应器中林丹去除的可能的协同作用（ SB）和（ii）评估最终电子受体（分别为O_2，CO_2和SO_4〜（-2）或A，M和SR）的效果，并补充碳源（蔗糖，1和0 g / L） ；分别以C或NC表示）在三重实验室规模SB中去除林丹的情况。在第一个实验中，林丹在手术的第一周被显着去除（55-70％）；减少的速度进一步降低。这两个因素均具有中等程度的显着影响。一方面，蔗糖的添加提高了林丹的去除率（p ＜0.08）；另一方面，土著微生物区系和林丹适应接种物表现出某种拮抗作用（p ＜0.07），因为无菌土壤中SB的去除率高于活土壤中的SB。在第二个实验中，因子“电子受体”对林丹的去除有显着影响（p ＜0.0001）：林丹的去除遵循A＞ SR＞ M的顺序。补充蔗糖具有显着的正效应（p ＜0.004） 。林丹降解产生的主要代谢产物是氯苯（CB），1,2-二氯苯（1,2-DCB）1,3-二氯苯（1,3-DCB）和1,2,4-三氯苯（1,2,4- TCB）在需氧和硫酸盐还原浆液生物反应器中，在产甲烷单元中仅发现CB和1,2-DCB。代谢产物与林丹有氧和厌氧降解途径中报道的代谢产物一致。

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