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采用直接蒸发法处理垃圾渗滤液试验研究

Keywords: 垃圾渗滤液,冷凝液,直接蒸发,浓缩,pH值,排放标准

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Abstract:

采用直接蒸发法处理早期、中期和晚期垃圾渗滤液,研究了蒸发过程对渗滤液CODCr和NH3-N的影响.结果表明:CODCr和NH3-N都呈现出前段蒸发量大、中段大幅度降低、后段又略有升高的趋势;pH值对CODCr和NH3-N蒸发量有显著影响,在中性和碱性条件下,中期和晚期渗滤液的CODCr蒸发量很低,NH3-N蒸发量均很高;在酸性条件下,中期和晚期渗滤液的CODCr蒸发量较低,早期和晚期渗滤液的NH3-N蒸发量很低;除了酸性条件下中期渗滤液以外的中期和晚期渗滤液的冷凝液CODCr以及酸性条件下的早期和晚期渗滤液的冷凝液NH3-N均低于《生活垃圾填埋场污染控制标准》(GB16889—2008)特别排放限值;酸性条件下的中期渗滤液的冷凝液CODCr和NH3-N的质量浓度也达到或仅稍高于该标准的排放浓度限值;浓缩后渗滤液体积可缩减至原液的1/6-1/10,显著降低了后续处理量,为中期和晚期渗滤液的高效低成本处理提供了一个具有应用价值的方法.

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