Author
K.K. Jim
Bio: K.K. Jim is an academic researcher from University of Illinois at Urbana–Champaign. The author has contributed to research in topics: Corrosion & Ferrous. The author has an hindex of 1, co-authored 1 publications receiving 274 citations.
Topics: Corrosion, Ferrous, Magnetite, Goethite, Dissolution
Papers
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TL;DR: It is substantiated that increasing the concentration of oxidants in water and maintaining flowing conditions can reduce the amount of iron release from corroded iron pipes, and that the microstructure and composition of corrosion scales are important parameters that can influence the amounts of iron released from such systems.
313 citations
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TL;DR: The mixed corrosion-inducing bacteria, including the IRB Shewanella sp.
201 citations
TL;DR: Investigation of zero-valent iron based SONO household filters in Bangladesh found that users filtered less than reported volumes of water, pointing to the need for more educational efforts.
Abstract: The main arsenic mitigation measures in Bangladesh, well-switching and deep tube wells, have reduced As exposure, but water treatment is important where As-free water is not available. Zero-valent iron (ZVI) based SONO household filters, developed in Bangladesh, remove As by corrosion of locally available inexpensive surplus iron and sand filtration in two buckets. We investigated As removal in SONO filters in the field and laboratory, covering a range of typical groundwater concentrations (in mg/L) of As (0.14–0.96), Fe (0–17), P (0–4.4), Ca (45–162), and Mn (0–2.8). Depending on influent Fe(II) concentrations, 20–80% As was removed in the top sand layer, but As removal to safe levels occurred in the ZVI-layer of the first bucket. Residual As, Fe, and Mn were removed after re-aeration in the sand of the second bucket. New and over 8-year-old filters removed As to <50 μg/L and mostly to <10 μg/L and Mn to <0.2 mg/L. Vertical concentration profiles revealed formation of Fe(II) by corrosion of Fe(0) with O2...
168 citations
TL;DR: In this article, the effect of biofilm on corrosion scales of cast iron pipe was studied with the biofilm community structure investigated by PCR-DGGE to give an explanation to MIC from the viewpoint of microbial phase.
148 citations
TL;DR: The M/G ratio could be used to identify the characteristics and evaluate the performances of corrosion scales formed under different water conditions, which was implicated by relatively higher siderite, green rust and total iron contents in their corrosion scales.
145 citations
TL;DR: This study tracks tap water microbiome assembly in situ, showing that bacterial community composition changes rapidly from the city supply following ~6-day stagnation, along with an increase in cell count along with a developed size-effect model to simulate this process.
Abstract: What happens to tap water when you are away from home? Day-to-day water stagnation in building plumbing can potentially result in water quality deterioration (e.g., lead release or pathogen proliferation), which is a major public health concern. However, little is known about the microbial ecosystem processes in plumbing systems, hindering the development of biological monitoring strategies. Here, we track tap water microbiome assembly in situ, showing that bacterial community composition changes rapidly from the city supply following ~6-day stagnation, along with an increase in cell count from 103 cells/mL to upwards of 7.8 × 105 cells/mL. Remarkably, bacterial community assembly was highly reproducible in this built environment system (median Spearman correlation between temporal replicates = 0.78). Using an island biogeography model, we show that neutral processes arising from the microbial communities in the city water supply (i.e., migration and demographic stochasticity) explained the island community composition in proximal pipes (Goodness-of-fit = 0.48), yet declined as water approached the faucet (Goodness-of-fit = 0.21). We developed a size-effect model to simulate this process, which indicated that pipe diameter drove these changes by mediating the kinetics of hypochlorite decay and cell detachment, affecting selection, migration, and demographic stochasticity. Our study challenges current water quality monitoring practice worldwide which ignore biological growth in plumbing, and suggests the island biogeography model as a useful framework to evaluate building water system quality.
139 citations