锰砂与粉末活性炭对印染废水脱色的研究

利用除铁用锰矿砂(PGM)为处理剂进行罗丹明B与甲基橙模拟废水的静态脱色试验,并与粉末活性炭(PAC)进行对比。结果表明:PAC与染料的作用机理是物理吸附,脱色率受pH影响较小,对甲基橙和罗丹明B分别符合Langmuir和Freundlich方程。PGM在酸性条件下对染料的脱色是氧化与吸附的综合作用,较低的pH、较高的投量和恰当的反应时间可提高PGM的脱色效能,pH是影响PGM脱色能力的关键因素,pH=1.2时,符合Langmuir方程。酸性条件下较大的吸附容量和较短的平衡时间使PGM有可能应用于染料废水深度处理。

Study on decolorization of dyeing wastewater by PGM and PAC

Manganese ore (PGM) and powder active carbon (PAC) are used in static experiment to decolorize dyestuffs Rhodamine B and methyl orange wastewater. The results show that the mechanism of PAC is physical adsorption and not affected much by pH value. The adsorption behaviors follow Langmuir ( methyl orange) or Freundlich ( Rhodamine B) isotherm equation with PAC. The decolorization by PGM in acidic medium is an integrative process, which is composed by oxidation and adsorption. Lower pH value, higher dosage and adequate time can improve decolorization efficiency of PGM. The pH value is the most important factor of decolorization by PGM. The adsorption behaviors follow Langmuir isotherm equation under the condition of pH =1.2. PGM may come into use for its large quantity of adsorption capacity and short time to equilibrium.