Department of Agricultural Chemistry, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh.
Department of Food Technology and Rural Industries, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh.
Environ Sci Pollut Res Int. 2018 Mar;25(8):7954-7967. doi: 10.1007/s11356-017-1166-9. Epub 2018 Jan 4.
The Madhabdi municipality in the Narsingdi district of Bangladesh is a well-known area for textile, handloom weaving, and dyeing industries. These textile industries produce a considerable amount of effluents, sewage sludge, and solid waste materials every day that they directly discharge into surrounding water bodies and agricultural fields. This disposal poses a serious threat to the overall epidemic and socio-economic pattern of the locality. This research entailed the collection of 34 handloom-dyeing effluent samples from different handloom-dyeing industries of Madhabdi, which were then analyzed to determine the contents of the heavy metals iron (Fe), zinc (Zn), copper (Cu), chromium (Cr), manganese (Mn), lead (Pb), and cadmium (Cd). Average concentrations of Fe, Cr, Cu, Pb, Mn, and Zn were 3.81, 1.35, 1.70, 0.17, 0.75, and 0.73 mg L, respectively, whereas Cd content was below the detectable limit of the atomic adsorption spectrophotometer. The concentrations of Fe, Cr, Cu, Pb, and Mn exceed the industrial effluent discharge standards (IEDS) for inland surface water and irrigation water guideline values. A biosorption experiment of the heavy metals (Fe, Cr, Cu, Mn, and Zn) was conducted without controlling for any experimental parameters (e.g., pH, temperature, or other compounds present in the effluent samples) by using four agricultural wastes or byproducts, namely rice husk, sawdust, lemon peel, and eggshell. Twenty grams of each biosorbent was added to 1 L of effluent samples and stored for 7 days. The biosorption capacity of each biosorbent is ranked as follows: eggshell, sawdust, rice husk, and lemon peel. Furthermore, the biosorption affinity of each metal ion was found in the following order: Cu and Cr (both had similar biosorption affinity), Zn, Fe, Mn. The effluents should not be discharged before treatment, and efficient treatment of effluents is possible with eggshell powder or sawdust at a rate of 20 g of biosorbent per liter of effluents.
孟加拉国纳萨尔迪区的马德哈巴迪市是纺织、手工编织和染色工业的知名地区。这些纺织工业每天都会产生大量的废水、污水污泥和固体废物，它们直接排放到周围的水体和农田中。这种处理方式对当地的整体疫情和社会经济格局构成了严重威胁。本研究从马德哈巴迪的不同手工染色工业收集了 34 个手工染色废水样本，然后对其进行分析，以确定重金属铁 (Fe)、锌 (Zn)、铜 (Cu)、铬 (Cr)、锰 (Mn)、铅 (Pb) 和镉 (Cd) 的含量。Fe、Cr、Cu、Pb、Mn 和 Zn 的平均浓度分别为 3.81、1.35、1.70、0.17、0.75 和 0.73mg/L，而 Cd 含量低于原子吸收分光光度计的检测极限。Fe、Cr、Cu、Pb 和 Mn 的浓度超过了内陆地表水和灌溉水指导值的工业废水排放标准 (IEDS)。在没有控制任何实验参数（例如 pH 值、温度或废水中存在的其他化合物）的情况下，通过使用四种农业废弃物或副产品（稻壳、木屑、柠檬皮和蛋壳）进行了重金属 (Fe、Cr、Cu、Mn 和 Zn) 的生物吸附实验。将 20 克每种生物吸附剂添加到 1 升废水样品中，并储存 7 天。每种生物吸附剂的生物吸附能力排名如下：蛋壳、木屑、稻壳和柠檬皮。此外，还发现每种金属离子的生物吸附亲和力如下：Cu 和 Cr（具有相似的生物吸附亲和力）、Zn、Fe、Mn。废水在处理前不应排放，用蛋壳粉或木屑以每升废水 20 克生物吸附剂的比例进行有效处理是可行的。
