Electroplating sludge is a hazardous waste produced in plating and metallurgical processes which is commonly disposed of in safety landfills. In this work, electroplating sludge containing 25.6% Fe and 5.5% Co (named S1) and another containing 36.8% Fe and 7.8% Cr (S2) were recycled for the preparation of erdite-bearing particles via a facile hydrothermal route with only the addition of Na2S·9H2O. In the sludges, Fe-containing compounds were weakly crystallized and spontaneously converted to short rod-like erdite particles (SP1) in the presence of Co or long nanorod (SP2) particles with a diameter of 100 nm and length of 0.5–1.5 μm in the presence of Cr. The two products, SP1 and SP2, were applied in electroplating wastewater treatment, in which a small portion of Co in SP1 was released in wastewater, whereas Cr in SP2 was not. Adding 0.3 g/L SP2 resulted in the removal of 99.7% of Zn, 99.4% of Cu, 37.9% of Ni and 53.3% of Co in the electroplating wastewater, with residues at concentrations of 0.007, 0.003, 0.33, 0.09 and 0.002 mg/L, respectively. Thus, the treated electroplating wastewater met the discharge standard for electroplating wastewater in China. These removal efficiencies were higher than those achieved using powdered activated carbon, polyaluminum chloride, polyferric sulfate or pure Na2S·9H2O reagent. With the method, waste electroplating sludge was recycled as nanorod erdite-bearing particles which showed superior efficiency in electroplating wastewater treatment.

中文翻译：

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电镀污泥升级回收制备含钐铁矿纳米棒以吸附电镀废水中的重金属

电镀污泥是电镀和冶金过程中产生的危险废物，通常在安全垃圾填埋场进行处置。在这项工作中，含有 25.6% Fe 和 5.5% Co（命名为 S1）的电镀污泥和另一种含有 36.8% Fe 和 7.8% Cr（S2）的电镀污泥被回收用于通过简单的水热途径制备含铅沸石的颗粒，只需添加Na2S·9H2O。在污泥中，在 Co 或长纳米棒 (SP2) 颗粒的存在下，含 Fe 化合物微弱结晶并自发地转化为短棒状 erdite 颗粒 (SP1)，直径为 100 nm，长度为 0.5-1.5 μm。 Cr 的存在。SP1 和SP2 两种产品应用于电镀废水处理，其中SP1 中的一小部分Co 释放到废水中，而SP2 中的Cr 则没有。加0。3 g/L SP2去除电镀废水中99.7%的Zn、99.4%的Cu、37.9%的Ni和53.3%的Co，残留浓度分别为0.007、0.003、0.33、0.09和0.002mg/ L，分别。因此，处理后的电镀废水达到了我国电镀废水的排放标准。这些去除效率高于使用粉末活性炭、聚合氯化铝、聚合硫酸铁或纯 Na2S·9H2O 试剂所达到的去除效率。该方法将废电镀污泥回收为含纳米棒的颗粒，在电镀废水处理中表现出优异的效率。因此，处理后的电镀废水达到了我国电镀废水的排放标准。这些去除效率高于使用粉末活性炭、聚合氯化铝、聚合硫酸铁或纯 Na2S·9H2O 试剂实现的去除效率。该方法将废电镀污泥回收为含纳米棒的颗粒，在电镀废水处理中表现出优异的效率。因此，处理后的电镀废水达到了我国电镀废水的排放标准。这些去除效率高于使用粉末活性炭、聚合氯化铝、聚合硫酸铁或纯 Na2S·9H2O 试剂实现的去除效率。该方法将废电镀污泥回收为含纳米棒的颗粒，在电镀废水处理中表现出优异的效率。