Nunes Ramom R, Bontempi Rhaissa M, Mendonça Giovane, Galetti Gustavo, Rezende Maria Olímpia O
a Institute of Chemistry of São Carlos, University of São Paulo , São Carlos , Brazil.
b Center of Biological Science and Health, Federal University of São Carlos , São Carlos , Brazil.
J Environ Sci Health B. 2016;51(5):271-7. doi: 10.1080/03601234.2015.1128737. Epub 2016 Feb 1.
The leather industry (tanneries) generates high amounts of toxic wastes, including solid and liquid effluents that are rich in organic matter and mineral content. Vermicomposting was studied as an alternative method of treating the wastes from tanneries. Vermicompost was produced from the following tannery residues: tanned chips of wet-blue leather, sludge from a liquid residue treatment station, and a mixture of both. Five hundred earthworms (Eisenia fetida) were added to each barrel. During the following 135 days the following parameters were evaluated: pH, total organic carbon (TOC), organic matter (OM), cation exchange capacity (CEC), C:N ratio, and chromium content as Cr (III) and Cr (VI). The results for pH, TOC and OM contents showed decreases in their values during the composting process, whereas values for CEC and total nitrogen rose, indicating that the vermicompost reached maturity. For chromium, at 135 days, all values of Cr (VI) were below the detectable level. Therefore, the Cr (VI) content had probably been biologically transformed into Cr (III), confirming the use of this technique as an advanced biological treatment. The study reinforces the idea that vermicomposting could be introduced as an effective technology for the treatment of industrial tannery waste and the production of agricultural inputs.
皮革行业（制革厂）产生大量有毒废物，包括富含有机物和矿物质的固体和液体废水。对利用蚯蚓堆肥法处理制革厂废物的替代方法进行了研究。蚯蚓堆肥由以下制革厂残渣制成：湿蓝皮革的鞣制碎片、液体残渣处理站的污泥以及两者的混合物。向每个桶中添加了500条蚯蚓（赤子爱胜蚓）。在接下来的135天里，对以下参数进行了评估：pH值、总有机碳（TOC）、有机物（OM）、阳离子交换容量（CEC）、碳氮比以及铬含量（以Cr（III）和Cr（VI）形式存在）。pH值、TOC和OM含量的结果显示，在堆肥过程中其值下降，而CEC和总氮的值上升，这表明蚯蚓堆肥已达到成熟状态。对于铬，在135天时，所有Cr（VI）的值均低于可检测水平。因此，Cr（VI）含量可能已被生物转化为Cr（III），证实了该技术作为一种先进生物处理方法的应用。该研究强化了这样一种观点，即蚯蚓堆肥法可作为一种有效技术用于处理工业制革厂废物并生产农业投入物。
