重金屬廢渣場地污染概況

重金屬廢渣場地污染概況參照《展覽會用地土壤環(huán)境質(zhì)量評價(jià)標(biāo)準(zhǔn)（暫行）》（HJ350-2007）的B級標(biāo)準(zhǔn)，渣場所填廢渣或土壤中的主要重金屬污染物為鋅、鉛、鎘、砷（類重金屬）等四種。而廢渣和土壤中重金屬浸出濃度參照《污水綜合排放標(biāo)準(zhǔn)》（GB8978-1996）中的一級標(biāo)準(zhǔn)和《危險(xiǎn)廢物鑒別標(biāo)準(zhǔn)—浸出毒性鑒別》（GB5085.3-2007）中浸出液危害成分濃度限值。地下水質(zhì)參照《地下水質(zhì)量標(biāo)準(zhǔn)》（GB/T14848-93）IV類以農(nóng)業(yè)和工業(yè)用水要求為依據(jù)。地表水質(zhì)參照《地表水環(huán)境質(zhì)量標(biāo)準(zhǔn)》（GB3838-2002）IV類標(biāo)準(zhǔn)主要適用于一般工業(yè)用水區(qū)及人體非直接接觸的娛樂用水區(qū)。1.1單因子污染指數(shù)評價(jià)結(jié)果根據(jù)清霞新橋廢渣堆場現(xiàn)場采樣分析，重金屬單因子污染指數(shù)和超標(biāo)率見下表。表新橋廢渣場重金屬污染評價(jià)結(jié)果列表污染物測點(diǎn)數(shù)量污染指數(shù)(Pip)超標(biāo)率(Pie)%Pip≤11<Pip≤22<Pip≤33<Pip≤5Pip＞5個(gè)數(shù)百分率個(gè)數(shù)百分率個(gè)數(shù)百分率個(gè)數(shù)百分率個(gè)數(shù)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廢渣和土壤浸出毒性評估部分廢渣存在pH值偏高或偏低的問題。部分廢渣和土壤浸出液中各重金屬污染物濃度分析結(jié)果見污染廢渣浸出濃度分析結(jié)果表（單位為mg/L）。依據(jù)浸出毒性分析結(jié)果進(jìn)行判別，初步確定各廢渣場中的廢渣不屬于危險(xiǎn)廢物。場地內(nèi)除明顯可區(qū)分出來的建筑垃圾和生活垃圾外，其它廢渣主要為第Ⅰ類一般工業(yè)固體廢物（簡稱Ⅰ類廢渣）和第Ⅱ類一般工業(yè)固體廢物（簡稱Ⅱ類廢渣）。表污染廢渣浸出濃度分析結(jié)果表元素污水標(biāo)準(zhǔn)危廢標(biāo)準(zhǔn)XQ-S1XQ-S2XQ-B1BC-I4BC-I5DH-I4DH-S2DH-S3銀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鈹0.0050.02<0.001<0.001<0.001<0.001<0.001<0.001<0.001<0.001鎘0.110.0010.0350.00010.00050.00050.00050.00090.0045鉻1.5150.0030.040.014<0.0010.0030.0040.0030.003銅5100<0.00117.100.0350.0160.0070.0060.0070.005鎳150.0310.0170.0170.0110.0070.0040.0020.003鉛150.0020.084<0.0010.0050.001<0.0010.0040.002銻--0.02<0.0010.0070.010.0250.0090.0040.058硒0.110.008<0.0050.0070.6830.0260.005<0.0050.007鉈--<0.001<0.001<0.001<0.001<0.001<0.001<0.001<0.001鋅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淺層地下水污染狀況廢渣填埋區(qū)地下水較為貧乏，主要為局部原土層以上廢渣層所含的淺層滯水，各廢渣填埋區(qū)域地下水采樣監(jiān)測結(jié)果見下表。表廢渣填埋區(qū)域淺層地下水監(jiān)測結(jié)果表（mg/L）元素地下IV類DH-B01DH-I02BC-I04BC-I08XQ-I05XQ-I08XQ-B01銀-<0.0010.001<0.001<0.001<0.001<0.001<0.001砷0.05<0.0050.260.0080.0670.0720.0120.199鈹0.001<0.001<0.001<0.001<0.001<0.001<0.001<0.001鎘0.010.00070.01130.00060.0022<0.10.00060.0017鉻0.10.0020.0200.0160.0090.0040.0030.035銅1.5<0.0010.0660.0040.0020.0030.0020.039鎳0.10.0250.0590.0380.0460.0870.0130.094鉛0.1<0.0010.067<0.001<0.001<0.001<0.001<0.001銻-<0.0010.0610.0080.018<0.0010.0430.017硒0.1<0.0050.1340.0250.1290.0180.039<0.005鉈-<0.001<0.001<0.001<0.001<