重金属废渣场地污染概况

重金属废渣场地污染概况参照《展览会用地土壤环境质量评价标准（暂行）》（HJ350-2007）的B级标准，渣场所填废渣或土壤中的主要重金属污染物为锌、铅、镉、砷（类重金属）等四种。而废渣和土壤中重金属浸出浓度参照《污水综合排放标准》（GB8978-1996）中的一级标准和《危险废物鉴别标准—浸出毒性鉴别》（GB5085.3-2007）中浸出液危害成分浓度限值。地下水质参照《地下水质量标准》（GB/T14848-93）IV类以农业和工业用水要求为依据。地表水质参照《地表水环境质量标准》（GB3838-2002）IV类标准主要适用于一般工业用水区及人体非直接接触的娱乐用水区。1.1单因子污染指数评价结果根据清霞新桥废渣堆场现场采样分析，重金属单因子污染指数和超标率见下表。表新桥废渣场重金属污染评价结果列表污染物测点数量污染指数(Pip)超标率(Pie)%Pip≤11<Pip≤22<Pip≤33<Pip≤5Pip＞5个数百分率个数百分率个数百分率个数百分率个数百分率Zn997676.81010.166.144.033.023.2Cr999898.011.000.000.000.01.0Cu999393.933.011.011.011.06.1Pb996968.71414.177.144.055.130.3Cd998080.855.166.133.055.118.2As996161.61818.233.066.11111.138.41.2废渣和土壤浸出毒性评估部分废渣存在pH值偏高或偏低的问题。部分废渣和土壤浸出液中各重金属污染物浓度分析结果见污染废渣浸出浓度分析结果表（单位为mg/L）。依据浸出毒性分析结果进行判别，初步确定各废渣场中的废渣不属于危险废物。场地内除明显可区分出来的建筑垃圾和生活垃圾外，其它废渣主要为第Ⅰ类一般工业固体废物（简称Ⅰ类废渣）和第Ⅱ类一般工业固体废物（简称Ⅱ类废渣）。表污染废渣浸出浓度分析结果表元素污水标准危废标准XQ-S1XQ-S2XQ-B1BC-I4BC-I5DH-I4DH-S2DH-S3银0.55<0.001<0.001<0.001<0.001<0.001<0.001<0.001<0.001砷0.550.694<0.0051.810.1070.1560.0070.0230.12铍0.0050.02<0.001<0.001<0.001<0.001<0.001<0.001<0.001<0.001镉0.110.0010.0350.00010.00050.00050.00050.00090.0045铬1.5150.0030.040.014<0.0010.0030.0040.0030.003铜5100<0.00117.100.0350.0160.0070.0060.0070.005镍150.0310.0170.0170.0110.0070.0040.0020.003铅150.0020.084<0.0010.0050.001<0.0010.0040.002锑--0.02<0.0010.0070.010.0250.0090.0040.058硒0.110.008<0.0050.0070.6830.0260.005<0.0050.007铊--<0.001<0.001<0.001<0.001<0.001<0.001<0.001<0.001锌21000.0270.027<0.005<0.005<0.005<0.0050.0230.010汞0.050.1<0.001<0.001<0.001<0.001<0.001<0.001<0.001<0.0011.3浅层地下水污染状况废渣填埋区地下水较为贫乏，主要为局部原土层以上废渣层所含的浅层滞水，各废渣填埋区域地下水采样监测结果见下表。表废渣填埋区域浅层地下水监测结果表（mg/L）元素地下IV类DH-B01DH-I02BC-I04BC-I08XQ-I05XQ-I08XQ-B01银-<0.0010.001<0.001<0.001<0.001<0.001<0.001砷0.05<0.0050.260.0080.0670.0720.0120.199铍0.001<0.001<0.001<0.001<0.001<0.001<0.001<0.001镉0.010.00070.01130.00060.0022<0.10.00060.0017铬0.10.0020.0200.0160.0090.0040.0030.035铜1.5<0.0010.0660.0040.0020.0030.0020.039镍0.10.0250.0590.0380.0460.0870.0130.094铅0.1<0.0010.067<0.001<0.001<0.001<0.001<0.001锑-<0.0010.0610.0080.018<0.0010.0430.017硒0.1<0.0050.1340.0250.1290.0180.039<0.005铊-<0.001<0.001<0.001<0.001<