Iron coated pottery granules for arsenic removal from drinking water

被引:55
作者
Dong, Liangjie [1 ]
Zinin, Pavel V. [2 ]
Cowen, James P. [2 ]
Ming, Li Chung [2 ]
机构
[1] Univ Hawaii, Coll Trop Agr & Human Resources, Honolulu, HI 96822 USA
[2] Univ Hawaii, Sch Ocean & Earth Sci & Technol, Honolulu, HI 96822 USA
关键词
Arsenic removal; Iron coated pottery granules; Drinking water; ZERO-VALENT IRON; MULLITE REACTION SEQUENCE; KAOLINITE-MULLITE; ADSORPTION; COAGULATION; GROUNDWATER; ADSORBENTS; INTERFACE; OXIDATION; AS(III);
D O I
10.1016/j.jhazmat.2009.02.168
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A new media, iron coated pottery granules (ICPG) has been developed for As removal from drinking water. ICPG is a solid phase media that produces a stable Fe-Si surface complex for arsenic adsorption. Scanning electron microscopy (SEM) was used to document the physical attributes (grain size, pore size and distribution, surface roughness) of the ICPG media. Several advantages of the ICPG media such as (a) its granular structure, (b) its ability to absorb As via the F(0) coating on the granules' surface: (c) the inexpensive preparation process for the media from clay material make ICPG media a highly effective media for removing arsenic at normal pH. A column filtration test demonstrated that within the stability region (flow rate lower than 15 L/h, EBCT >3 min), the concentration of As in the influent was always lower than 50 mu g/L The 2-week system ability test showed that the media consistently removed arsenic from test water to below the 5 mu g/L level. The average removal efficiencies for total arsenic, As(Ill), and As(V) for a 2-week test period were 98%, 97%. and 99%, respectively, at an average flow rate of 4.1 L/h and normal pH. Measurements of the Freundlich and Langmuir isotherms at normal pH show that the Freundlich constants of the ICPG are very close to those of ferric hydroxide, nanoscale zero-valent iron and much higher than those of nanocrystalline titanium dioxide. The parameter 1/n is smaller than 0.55 indicating a favorable adsorption process [K. Hristovski, A. Baumgardner, R Westerhoff, Selecting metal oxide nanomaterials for arsenic removal in fixed bed columns: from nanopowders to aggregated nanoparticle media, J. Hazard. Mater. 147 (2007) 265-274]. The maximum adsorption capacity (q(e)) of the ICPG from the Langmuir isotherm is very close to that of nanoscale zero-valent indicating that zero-valent iron is involved in the process of the As removal from the water. The results of the toxicity characteristic leaching procedure (TCLP) analysis revealed that the media was non-hazardous, as shown by the ND (non-detectable) result for arsenic. The mechanism of As adsorption by ICPG has not been determined. Formation of Fe-Si complexes on the surface of the ICPG system may be responsible for the tight bonding of the As to the IGPC media. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:626 / 632
页数:7
相关论文
共 42 条
[1]  
AHMED F, 2006, 31303 WORLD BANK, V2
[2]  
AMY G, 2004, IMPACT WATER QUALITY
[3]  
[Anonymous], 1997, Theory and practice of water and wastewater treatment
[4]   Hydrogen adsorption studies on single wall carbon nanotubes [J].
Ansón, A ;
Callejas, MA ;
Benito, AM ;
Maser, WK ;
Izquierdo, MT ;
Rubio, B ;
Jagiello, J ;
Thommes, M ;
Parra, JB ;
Martínez, MT .
CARBON, 2004, 42 (07) :1243-1248
[5]   Arsenate adsorption mechanisms at the allophane - water interface [J].
Arai, Y ;
Sparks, DL ;
Davis, JA .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2005, 39 (08) :2537-2544
[6]   X-ray absorption spectroscopic investigation of arsenite and arsenate adsorption at the aluminum oxide-water interface [J].
Arai, Y ;
Elzinga, EJ ;
Sparks, DL .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 2001, 235 (01) :80-88
[7]  
BELLOTTO M, 1995, PHYS CHEM MINER, V22, P207, DOI 10.1007/BF00202253
[8]   Adsorption of gases in multimolecular layers [J].
Brunauer, S ;
Emmett, PH ;
Teller, E .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1938, 60 :309-319
[9]  
CHENG RC, 1994, J AM WATER WORKS ASS, V86, P79
[10]  
Deer W., 1996, INTRO ROCK FORMING M