화학공학소재연구정보센터
Journal of Industrial and Engineering Chemistry, Vol.10, No.3, 337-348, May, 2004
Arsenic In Water: Concerns And Treatment Technologies
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Arsenic (As) contamination in groundwater raises grave concerns in many parts of the world. Arsenic can cause severe health problems even at very low concentration. In the first part of this review, the available technologies to treat As-rich water are discussed. It was found that even conventional technologies, which can be readily adopted in rural areas of the developing countries, can reduce As concentrations to the required level. The efficiency of the treatment technologies is better for removing As(V) than it is for As(III). The second part of this paper presents laboratory-scale experimental results with respect to specific treatment technologies, such as high-rate flocculation and a new membrane-adsorption system, for As removal. The results indicate that up to 78% of the As was removed when using a packed polystyrene-bead filter with in-line FeCl3 addition at a high loading rate (30 m3/m2h). When powder-activated carbon (PAC) was used as an adsorbent for in-line addition to the membrane hybrid system, 87% removal of As was achieved when the mixing time was 2.7 min, the velocity gradient was 87.8 s-1, the average permeate flux was 760 L/m2h and the membrane pore size was 0.2 m.
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