T251 Arsenic in Global Groundwater-Based Drinking Water Systems—Source-Water Characteristics, Safe Limits, Human-Health Impacts, Innovative Treatment Systems, and Policy Instruments

Wednesday, 25 September 2019
8:00 AM - 12:00 PM
Room 105BC, West Building

ARSENIC REMOVAL BY NOVEL NATURAL MAGNETIC ROCK MATERIAL FROM ARSENIC-BEARING GROUNDWATER AND ITS COMPARISON WITH SYNTHESIZED MAGNETIC NANOPARTICLE

Paper number: T251-13
Program: Technical Sessions
Time: 10:50 AM – 11:05 AM

Authors

Abstract

The arsenic pollution in surface and subsurface water, mobilization and its contamination in agricultural/aquacultural product (by food chain), are an important issue for environmental safety and human health. Thus, the removal of arsenic is an essential concern worldwide, in present decades. Considering this background, present research focuses on the arsenic removal from arsenic-bearing groundwater (AGW) and arsenic-containing-synthetic water (ASW) (2 mg/L) using natural magnetic material (NMM) (rock) and synthesized magnetic material (SMM) by Bacillus pasteurii and humic acid, comparative manner. The natural magnetic rock materials (NMM) were collected from northern part of Taiwan (Lengshueikeng, Yangmingshan National Park) from different site as Site-A (GPS: 25° 9′ 56.88″; 121° 33′ 58.32″), Site-B (GPS: 25° 9′ 52.56″; 121° 34′ 9.48″) and Site-C (GPS: 25° 9′ 44.28″; 121° 34′ 17.04″) with triple replicate (n=3) and used for arsenic removal. The AGW was collected from Santiaolun, Sihu Township, Yunlin County, Taiwan (GPS: 23° 39′ 7.20″; 120° 9′ 32.4″). The AGW (97.56±0.05 μg/L) exceed the WHO limit (10 μg/L) of arsenic in drinking water. The NMM consist of dominantly magnetite, hematite, ferrihydrate, coesite, quartz, and stishovite with the presence of iron (6.25-8.86% Fe3O4), which is widespread and important component in sedimentary rocks. The investigation of NMM and SMM in vibrating sample magnetometers, demonstrated the typical magnetization properties, which can be separated after arsenic removal. The thermogravimetric analysis of SMM displayed the existence of organic matter decomposition during particle synthesis. The TEM and SEM exhibited the nanoparticle particle formation within the range of 10-39 nm (10-20 nm particle Fe3O4 through B. pasteurii). The study on functional group (before and after removal of arsenic) indicated the existence and binding nature in between arsenic and iron. >90% of arsenic was removed from AGW using Fe3O4, Fe3O4 (N2-Environment), Fe3O4 with humic acid, and Fe3O4 with B. pasteurii after 25 min, 8 min, 13 min and 120 min, respectively. In case of NMM in Site-A, the arsenic removal was observed very fast as 85-87% within 30 second, whereas 95-99%, 93-95% and 88-91% removal detected using the sample of Site-A, Site-B, and Site-C respectively, after 120 min at natural pH (8.31±0.05) of AGW. Thus, NMM (ecofriendly green material) can be applicable for arsenic removal from AGW.

Geological Society of America Abstracts with Programs. Vol. 51, No. 5

doi: 10.1130/abs/2019AM-338159

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