Phytoremediation of Metal-Contaminated Av Siv Organic Amendments

Cov pa roj carbon activated muaj cov khoom siv carbonaceous tau los ntawm charcoal. Cov pa roj carbon activated yog tsim los ntawm pyrolysis ntawm cov ntaub ntawv organic ntawm cov hauv paus chiv keeb. Cov ntaub ntawv no muaj xws li thee, txiv maj phaub plhaub thiab ntoo,qab zib bagasse,soybean hullthiab nutshell (Dias et al., 2007; Paraskeva et al., 2008). Nyob rau hauv ib tug txwv scale,tsiaj quavkuj tseem siv rau kev tsim cov pa roj carbon activated. Kev siv cov pa roj carbon activated yog ib txwm siv los tshem tawm cov hlau los ntawm cov dej khib nyiab, tab sis nws siv rau cov hlau immobilization tsis muaj nyob hauv cov av tsis huv (Gerçel thiab Gerçel, 2007; Lima thiab Marshall, 2005b). Poultry manure derived activated carbon has excellent metal binding capacity (Lima and Marshall, 2005a). Cov pa roj carbon activated feem ntau yog siv los kho cov pa phem hauv av thiab dej vim yog cov qauv ntxeem tau, thaj chaw loj thiab muaj peev xwm adsorption siab (Üçer li al., 2006). Activated carbon tshem tawm cov hlau (Ni, Cu, Fe, Co, Cr) los ntawm kev daws los ntawm nag lossis daus li hlau hydroxide, adsorption ntawm activated carbon (Lyubchik li al., 2004). Almond husk tau txais AC zoo tshem tawm Ni los ntawm cov dej khib nyiab nrog thiab tsis muaj H₂SO₄kev kho mob (Hasar, 2003).

Tsis ntev los no, biochar tau siv los hloov kho av vim nws cov txiaj ntsig zoo ntawm cov av sib txawv ntawm lub cev thiab tshuaj lom neeg (Beesley li al., 2010). Biochar muaj cov ntsiab lus siab heev (txog 90%) nyob ntawm cov khoom siv niam txiv (Chan thiab Xu, 2009). Ntxiv ntawm biochar pab txhim kho cov adsorption ntawm yaj cov organic carbon,av pH, txo cov hlau hauv cov leachates thiab ntxiv cov as-ham (Novak li al., 2009; Pietikäinen li al., 2000). Ntev mus ntev ntawm biochar nyob rau hauv av txo cov tswv yim ntawm cov hlau los ntawm kev rov ua dua lwm cov kev hloov kho (Lehmann thiab Joseph, 2009). Beesley et al. (2010) xaus lus tias biochar txo dej soluble Cd thiab Zn nyob rau hauv cov av vim nce nyob rau hauv organic carbon thiab pH. Cov pa roj carbon activated txo cov hlau concentration (Ni, Cu, Mn, Zn) hauv cov nroj tsuag pob kws cog hauv cov av tsis huv piv rau cov av uas tsis tau hloov kho (Sabir li al., 2013). Biochar txo cov concentrations siab ntawm Cd thiab Zn soluble hauv cov av tsis huv (Beesley thiab Marmiroli, 2011). Lawv xaus lus tias sorption yog ib qho tseem ceeb mechanism rau khaws cov hlau los ntawm cov av. Biochar txo qis concentration ntawm Cd thiab Zn mus rau 300- thiab 45-fold txo nyob rau hauv lawv cov leachate concentrations, raws li (Beesley thiab Marmiroli, 2011).