Swarnalatha S, Srinivasulu T, Srimurali M, Sekaran G
Department of Environmental Technology, Central Leather Research Institute, Adyar, Chennai 600 020, Tamil Nadu, India.
J Hazard Mater. 2008 Jan 31;150(2):290-9. doi: 10.1016/j.jhazmat.2007.04.100. Epub 2007 Apr 24.
The high concentration of trivalent chromium along with organic/inorganic compounds in chrome buffing dust (CBD), the solid waste discharged from leather industries, causes severe groundwater contamination on land co-disposal and chronic air pollution during thermal incineration. In the present investigation, CBD was subjected to starved air incineration (SAI) at 800 degrees C in a thermal incinerator under different flow rates of oxygen to optimize the oxygen required to incinerate the organic compounds and simultaneously preventing the conversion of Cr(3+) to Cr(6+). The energy audit of SAI of buffing dust under the external supply of oxygen was carried out under different incineration conditions. The bottom ash from SAI was effectively solidified/stabilized using Portland cement and fine aggregate. The solidified blocks were tested for unconfined compressive strength and heavy metal leaching. Unconfined compressive strength of the blocks was in the range of 120-180 kg/cm(2). The stabilization of chromium(III) in the cement gel matrix was confirmed using Scanning Electron Microscopy SEM, Electron Paramagnetic Resonance spectroscopy (EPR) and X-ray diffraction spectroscopy (XRD). Leachability studies through TCLP on solidified blocks were carried out to determine the degree of leaching of chromium and organic compounds (expressed as COD) under standard conditions.
铬抛光粉尘（CBD）是皮革工业排放的固体废物，其中高浓度的三价铬与有机/无机化合物一起，在土地共处置时会导致严重的地下水污染，在热焚烧过程中会造成慢性空气污染。在本研究中，将CBD在热焚烧炉中于800℃下进行缺氧焚烧（SAI），在不同的氧气流量下优化焚烧有机化合物所需的氧气量，同时防止Cr(3+)转化为Cr(6+)。在不同的焚烧条件下，对外部供氧情况下抛光粉尘的SAI进行了能源审计。SAI产生的底灰用波特兰水泥和细骨料进行了有效的固化/稳定化处理。对固化块进行了无侧限抗压强度和重金属浸出测试。块体的无侧限抗压强度在120 - 180 kg/cm(2)范围内。使用扫描电子显微镜（SEM）、电子顺磁共振光谱（EPR）和X射线衍射光谱（XRD）确认了水泥凝胶基质中铬（III）的稳定化。通过TCLP对固化块进行浸出性研究，以确定在标准条件下铬和有机化合物（以化学需氧量表示）的浸出程度。
