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首页> 外文期刊>The Science of the Total Environment >Transformation of roxarsone in the anoxic-oxic process when treating the livestock wastewater
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Transformation of roxarsone in the anoxic-oxic process when treating the livestock wastewater

机译：牲畜废水处理过程中洛克沙酮在缺氧-有氧过程中的转化

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AbstractIn order to evaluate the influence of roxarsone (ROX) on the livestock wastewater treatment, a lab-scale pilot employing an anoxic–oxic (A-O) process was investigated by adding different concentrations of ROX at different periods. The mass balance of arsenic (As) in the A-O system was established through the analysis of As speciation and As migration in the gas, liquid and solid phases. The results showed that around 80% of total ROX (initial concentration was 50mgROXL−1) was eliminated in the anoxic reactor (R1) in which at least about 11% of total ROX was transformed to inorganic Asv(iAsv) due to the direct breaking of the C-As bond of ROX. Inorganic AsIII(iAsIII) and arsine (AsH3) were produced in R1, while the generated iAsIIIin the effluent of R1 was almost completely oxidized to iAsVin the aerobic reactor (R2). However, the concentration of ROX in the effluent of R2 was almost the same as that in the effluent of R1. After 85days operation, iAsVand residual ROX as the main forms of As were observed after the A-O process. Furthermore, the mass balance of As at steady state revealed that around 0.08%, 3.91% and 96.01% of total As was transformed into gas (biogas), solid (excess sludge) and liquid (effluent). Additionally, the 16S rRNA analysis demonstrated that the existence of ROX in livestock wastewater may play a crucial role in the diversity of bacterial community in the A-O system.Graphical abstractDisplay OmittedHighlights•A-O process was used to treat synthetic livestock wastewater containing ROX.•ROX and its metabolites could affect the bacterial communities in the process.•Different forms of As could be detected in the effluent, sludge and biogas.
机译： 摘要 为了评估roxarsone（ROX）对牲畜废水处理的影响，实验室规模的试验采用了缺氧-有氧（通过在不同时期添加不同浓度的ROX来研究AO）过程。通过分析砷的形态和砷在气相，液相和固相中的迁移，建立了A-O系统中砷的质量平衡。结果表明，在缺氧反应器（R1）中消除了大约80％的总ROX（初始浓度为50mgROXL -1 ），其中至少约11％由于直接破坏，​​总ROX的百分比转换为无机As v （iAs v ） ROX的C-As键。无机As III （iAs III ）和砷化氢（AsH 3 ）在R1中产生，而R1废水中生成的iAs III 几乎被完全氧化为iAs V 在好氧反应堆（R2）中。但是，R2流出物中的ROX浓度与R1流出物中的ROX浓度几乎相同。在运行85天后，在A-O处理后观察到iAs V 和残留的ROX作为As的主要形式。此外，稳定状态下的砷质量平衡表明，约0.08％，3.91％和96.01％的总砷转化为气体（沼气），固体（过量污泥）和液体（废水）。此外，16S rRNA分析表明，畜禽废水中ROX的存在可能对AO系统中细菌群落的多样性起着至关重要的作用。 图形摘要 省略显示 突出显示 • AO流程为 • ROX及其代谢物可能会影响过程中的细菌群落。 • 在废水，污泥和沼气中可以检测到不同形式的As。 < / ce：list-item>

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