中国环境科学
中國環境科學
중국배경과학
CHINA ENVIRONMENTAL SCIENCE
2014年
5期
1222-1228
,共7页
土壤洗涤%重金属%洗涤剂%多轮洗涤%形态
土壤洗滌%重金屬%洗滌劑%多輪洗滌%形態
토양세조%중금속%세조제%다륜세조%형태
soil washing%heavy metals%reagents%multi-step washing%speciation
本文以某化工厂受As、Cd、Cu和Pb污染场地土壤为研究对象,将EDTA分别与柠檬酸、鼠李糖脂和草酸组合进行2轮搅拌洗涤修复,考察实验室条件下不同洗涤剂组合对重金属提取能力差异和形态分布的影响,研究多金属污染土壤的最佳洗涤方式.结果表明,与单轮洗涤相比,两轮洗涤处理明显提高了As、Cd、Cu和Pb的去除率,增幅范围在8.45%~36.81%.经过EDTA+草酸组合的洗涤,As和Cu的去除率分别可达24.04%和29.25%；EDTA+鼠李糖脂和鼠李糖脂+EDTA组合对Cd和Pb的去除效果显著,洗脱率分别为47.83%和30.59%.柠檬酸和EDTA组合能有效削减4种重金属有效态比例,使As、Cd、Cu和Pb的有效态分别降低了8.61%、9.37%、14.12%和25.16%.实际工程应用中对多种洗涤剂进行选配,并对多重金属污染土壤进行多轮洗涤修复,应充分考虑重金属去除量以及有效态削减情况,确定洗涤剂最优组合,确保治理修复后土样残留重金属的稳定性以减少对环境后续影响.
本文以某化工廠受As、Cd、Cu和Pb汙染場地土壤為研究對象,將EDTA分彆與檸檬痠、鼠李糖脂和草痠組閤進行2輪攪拌洗滌脩複,攷察實驗室條件下不同洗滌劑組閤對重金屬提取能力差異和形態分佈的影響,研究多金屬汙染土壤的最佳洗滌方式.結果錶明,與單輪洗滌相比,兩輪洗滌處理明顯提高瞭As、Cd、Cu和Pb的去除率,增幅範圍在8.45%~36.81%.經過EDTA+草痠組閤的洗滌,As和Cu的去除率分彆可達24.04%和29.25%；EDTA+鼠李糖脂和鼠李糖脂+EDTA組閤對Cd和Pb的去除效果顯著,洗脫率分彆為47.83%和30.59%.檸檬痠和EDTA組閤能有效削減4種重金屬有效態比例,使As、Cd、Cu和Pb的有效態分彆降低瞭8.61%、9.37%、14.12%和25.16%.實際工程應用中對多種洗滌劑進行選配,併對多重金屬汙染土壤進行多輪洗滌脩複,應充分攷慮重金屬去除量以及有效態削減情況,確定洗滌劑最優組閤,確保治理脩複後土樣殘留重金屬的穩定性以減少對環境後續影響.
본문이모화공엄수As、Cd、Cu화Pb오염장지토양위연구대상,장EDTA분별여저몽산、서리당지화초산조합진행2륜교반세조수복,고찰실험실조건하불동세조제조합대중금속제취능력차이화형태분포적영향,연구다금속오염토양적최가세조방식.결과표명,여단륜세조상비,량륜세조처리명현제고료As、Cd、Cu화Pb적거제솔,증폭범위재8.45%~36.81%.경과EDTA+초산조합적세조,As화Cu적거제솔분별가체24.04%화29.25%；EDTA+서리당지화서리당지+EDTA조합대Cd화Pb적거제효과현저,세탈솔분별위47.83%화30.59%.저몽산화EDTA조합능유효삭감4충중금속유효태비례,사As、Cd、Cu화Pb적유효태분별강저료8.61%、9.37%、14.12%화25.16%.실제공정응용중대다충세조제진행선배,병대다중금속오염토양진행다륜세조수복,응충분고필중금속거제량이급유효태삭감정황,학정세조제최우조합,학보치리수복후토양잔류중금속적은정성이감소대배경후속영향.
Washing performance of soil polluted by As, Cd, Cu, and Pb was studied to reveal the optimal parameters for remediation of heavy metal contaminated soil. Three reagents, namely citric acid, rhamnolipid, and oxalic acid, were selected and combined with EDTA, respectively. Compared with one-step washing, the two-step sequential washing with different reagents increased the removal efficiencies of As, Cd, Cu, and Pb by 8.45%~36.81%. The removal of As and Cu could reach 24.85% and 29.25%, respectively, when applying the two-step sequential washing with the combination of EDTA and oxalic acid, 47.83%of Cd and 30.59%of Pb in the soil could be eluted by washing with the combination of EDTA and rhamnolipid. After washing with the combination of EDTA and citric acid, the available contents of As, Cd, Cu and Pb in the soil decreased by 8.61%, 9.37%, 14.12%, and 25.16%, respectively. From practical perspective, the application of combining different reagents and adopting multi-step sequential washing require further process optimization, with special attention to the removal of both total metal amount and the available contents. The stability of heavy metal residues after remediation can thus be ensured, and subsequent impacts to the environment can be mitigated.
