Harshad V. Kulkarni

Harshad V. Kulkarni
University of Texas at San Antonio | UTSA · Department of Earth and Planetary Sciences

Ph.D., M.S., B.E.

About

85
Publications
6,410
Reads
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403
Citations
Citations since 2016
75 Research Items
398 Citations
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
Additional affiliations
July 2021 - present
University of Texas at San Antonio
Position
  • Lecturer
July 2019 - July 2021
University of Texas at San Antonio
Position
  • PostDoc Position
July 2018 - July 2019
Kansas State University
Position
  • PostDoc Position
Education
January 2013 - May 2016
Kansas State University
Field of study
  • Environmental Engineering
August 2009 - December 2012
Colorado State University
Field of study
  • Environmental Engineering
June 2005 - June 2009
Kolhapur Institute Of Technology's College Of Engineering
Field of study
  • Environmental Engineering

Publications

Publications (85)
Article
Full-text available
Elevated dissolved arsenic (As) concentrations in the shallow aquifers of Bangladesh are primarily caused by microbially-mediated reduction of As-bearing iron (Fe) (oxy)hydroxides in organic matter (OM) rich, reducing environments. Along the Meghna River in Bangladesh, interactions between the river and groundwater within the hyporheic zone cause f...
Article
Full-text available
Recently, the use of brackish diatoms has been proposed to remove various inorganic constituents, such as dissolved silica, nutrients, calcium, and bicarbonate, to enhance the freshwater recovery in reverse osmosis (RO). In this study, nine strains of brackish diatoms isolated from water and sediment samples from several evaporation ponds in Califo...
Poster
Full-text available
Persistent and more frequent severe droughts in addition to rapidly growing populations is leading to increasing water stress. This reality is especially prevalent within the semi-arid southwestern portion of the United States. The scientific community, governments, and water industry are working towards achieving more sustainable water supplies vi...
Article
Volcanic (lava tube) caves at Lava Beds National Monument (N. CA, USA) provide a valuable terrestrial analog for volcanic caves on Mars and the Moon. Terrestrial volcanic caves host a diverse microbial life, liquid water, and a variety of secondary mineral deposits (speleothems) with diverse morphologies and chemical compositions. Speleothems may p...
Conference Paper
Abstract The destructive effects of high magnitude wildfires on surface vegetation and the alteration of soil properties are known and well-studied. However, their impacts on subsurface environments such as caves, shallow aquifers and vadose zone are, by comparison, understudied. Lava Beds National Monument (Lava Beds, N. California) hosts volcanic...
Conference Paper
Understanding the interactions among dissolved organic carbon (DOC), arsenic and fecal contamination in the groundwater of southeast Bangladesh is crucial as groundwater is the most important drinking water sources in Bangladesh. Groundwater samples (13 – 236 m depths) from four piezometer nests and nearby surface water samples from Matlab (SE Bang...
Conference Paper
Contamination of surface water resources with pathogens promoted the use of shallow groundwater as a primary drinking water source in Bangladesh several decades ago. However, the shallow groundwater containing elevated levels of arsenic (As) caused a severe health threat to millions. Recently it was observed that As-contaminated groundwater also co...
Conference Paper
Volcanic caves at Lava Beds National Monument (N. CA, USA) provide a valuable terrestrial analog for lava tubes on Mars and the Moon. The caves house secondary mineral deposits (speleothems), formed in the presence of liquid water, of diverse morphology and chemistry and preserve a record of microbial life. In order to elucidate the processes leadi...
Conference Paper
Full-text available
Elevated tungsten (W) levels in human body fluids have been linked to a childhood leukemia cluster in Fallon, Nevada. We studied the occurrence and speciation of W in sediments from Fallon, NV in order to understand mobilization of W in the environment. Sedimentary W concentration was measured by total and sequential extraction followed by high res...
Presentation
Geologically sourced arsenic (As) commonly contaminates pore-waters of shallow (<50 m) alluvial aquifers across deltas in south Asia. Consumption of As from drinking water causes chronic health problems, learning disabilities, and early mortality through a host of diseases. This shallow groundwater flows towards low-lying rivers. Within riverbanks,...
Conference Paper
Elevated concentrations of arsenic (As) in groundwater pose serious health concerns, affecting millions of people globally. Shallow aquifer sediments enriched with Fe-oxy(hydroxides) have been shown to release adsorbed As under reducing conditions. Recent studies have suggested that the mixing of oxic river water and reduced groundwater with ambien...
Conference Paper
The mobilization of co-occurring trace elements (CTEs) in aquifers with known metal(loid) contamination may exacerbate potential human health threats where release mechanisms are not geochemically limited. This study investigates the co-mobilization of the potentially toxic CTEs antimony (Sb), molybdenum (Mo), vanadium (V), uranium (U), and seleniu...
Conference Paper
Brackish groundwater containing TDS in the range of 1–10 g/L is an important water resource (8.5×106 km3) that can be used for potable and non-potable applications after desalination in US. Currently, the brackish groundwater desalination is mainly achieved by RO treatment processes and its efficiency is limited by scaling and fouling of membranes...
Article
The mobilization of co-occurring trace elements (CTEs) in aquifers with known metal (loid) contamination may exacerbate potential human health threats where release mechanisms are not geochemically limited. This study investigates the co-mobilization of the potentially toxic CTEs antimony (Sb), molybdenum (Mo), vanadium (V), uranium (U), and seleni...
Article
Tungsten (W) occurrence and speciation was investigated in sediments collected from Fallon, Nevada where previous studies have linked elevated W levels in human body fluids to an unusual cluster of childhood leukemia cases. The speciation of sedimentary W was determined by μ-XRF mapping and μ-XANES. The W content of the analyzed surface sediments r...
Conference Paper
Arsenic (As) and manganese (Mn) biogeochemistry is intimately linked with dissolved organic matter (DOM) in subsurface aqueous environments. In this study, we explore the role of contrasting DOM quality on the distributions of Mn and As in groundwater. Tubewell and subsurface sediment samples were collected from Murshidabad, West Bengal (WB), India...
Article
Occurrences of high arsenic (As) in sediments and groundwaters were investigated in the Claromecó fluvial basin, southern Pampean plain, Argentina. This investigation includes sedimentology, mineralogy, and hydrogeochemistry of the Neogene and Quaternary aquifers to determine possible sources and transport mechanisms for As in the Claromecó basin....
Conference Paper
Full-text available
The distribution of arsenic (As) and its release mechanisms in sedimentary aquifers have been studied for several decades. Complex hydrogeology, redox biogeochemistry and presence of dissolved organic matter (DOM) in the aquifers appear to control As oxyanion release. Currently, reductive dissolution of As-bearing iron minerals by the bacteria fuel...
Article
In this study, 11 reverse osmosis (RO) concentrate samples from six full-scale potable reuse facilities in the southwestern United States were treated by a new photobiological treatment process using brackish water diatoms at a laboratory scale. While eight out of the 11 RO concentrate samples were successfully treated by the photobiological treatm...
Article
Recently it was demonstrated that silica assimilating brackish water diatoms can remove the reactive silica and inorganic scalants from the reverse osmosis (RO) concentrate. Photobiologically treated RO concentrate can be further treated using a secondary RO for improved permeate recovery and minimal brine generation. Here, the factors influencing...
Article
The optical properties of bulk dissolved organic matter (DOM) at ambient pH and upon acidification (pH ~2) by hydrochloric acid (HCl) or nitric acid (HNO3) were examined in groundwater and surface water samples from the Bengal Basin. Samples of shallow high arsenic (As) and deep low As groundwaters and surface waters from the same geographic area w...
Article
Full-text available
Dissolved organic matter (DOM) is linked to the heterogeneous distribution of elevated arsenic (As) in groundwater used for drinking and irrigation purposes, but the relationship between DOM characteristics and arsenic mobility has yet to be fully understood. Here, DOM from groundwater sampled in the Bengal Basin region was characterized using both...
Article
Reverse osmosis (RO)-based desalination and advanced water purification facilities have inherent challenges associated with concentrate management and disposal. Although enhanced permeate recovery and concentrate minimization are desired, membrane scaling due to inorganic constituents such as silica, calcium, phosphate, and iron hinders the process...
Article
Arsenic (As) mobilization in the Bengal Basin aquifers has been studied for several decades due to the complex redox bio-geochemistry, dynamic hydrogeology and complex nature of dissolved organic matter (DOM). Earlier studies have examined the changes in groundwater As in the dry season before monsoon and during the wet season after monsoonal recha...
Article
It was demonstrated more than two decades ago that microorganisms use humic substances, including fulvic acid (FA), as electron shuttles during iron (Fe) reduction in anaerobic soils and sediments. The relevance of this mechanism for the acceleration of Fe(III) reduction in arsenic-laden groundwater environments is gaining wider attention. Here we...
Conference Paper
Elevated levels of dissolved arsenic (As), iron (Fe) and manganese (Mn) are seen in the shallow groundwaters of southeast Bangladesh on the Ganges Brahmaputra Meghna River delta. This study takes a multi disciplinary approach to understand the extent of the natural reactive barrier (NRB) along the Meghna River and evaluate the role of the NRB in As...
Article
Full-text available
The prevalence of manganese (Mn) in Southeast Asian drinking water has recently become a topic of discussion, particularly when concurrent with elevated arsenic (As). Although Mn groundwater geochemistry has been studied, the link between dissolved organic matter (DOM) quality and Mn release is less understood. This work evaluates characteristics o...
Conference Paper
The role of dissolved organic matter (DOM) in the biogeochemical interactions resulting in iron (Fe) and arsenic (As) mobilization in reducing aquifers of West Bengal (India) has been documented recently. Monsoonal recharge in this region is also an important hydrologic control influencing the redox conditions, groundwater flow and quality. Studies...
Thesis
Full-text available
Groundwater contamination with arsenic (As), a naturally occurring metalloid, is a worldwide problem. Over 100 million people are at health risk due to arsenic contaminated groundwater, especially in the Bengal Basin in south-east Asia. Dissolved organic matter (DOM), geology and geomicrobiology are important factors affecting arsenic mobility. Thi...
Article
The discontinuous nature of elevated arsenic (As) in drinking water wells of West Bengal and other regions in the Bengal Basin has led to increased interest in the role that sediment-derived organic matter may play in enhancing reductive dissolution and AS mobilization. Higher As concentrations have been observed in groundwater in reduced Holocene...
Conference Paper
The prevalence of manganese (Mn) and arsenic (As) and their impacts on human health have been documented extensively in the groundwater of West Bengal, India. Although the general mechanisms behind the release of these elements are understood, the link between dissolved (>0.7μm) organic matter (DOM) quality and Mn and As release is less explored. T...
Conference Paper
Full-text available
Complexation of arsenic (As) with dissolved organic matter (DOM) in reducing aquifers is one of the mechanisms that controls the As concentration in aqueous solution. It has been shown that in the presence of iron (Fe), DOM may either compete with As for adsorption sites and/or bind to form ternary complexes (As-Fe-DOM) or binary complexes (AsDOM)....
Conference Paper
Full-text available
Elevated concentrations of manganese (Mn) have been observed in the groundwaters of West Bengal, India. As a neurotoxin Mn is known to cause a variety of adverse health effects, ranging from neuromuscular problems to the inhibition of neurological devlopment, particularly in children. The realization of this additional contaminant in the arsenic af...
Conference Paper
Full-text available
In the lower Bengal delta plain, Murshidabad in India, and Matlab in Bangladesh, are two sites currently being studied both demonstrating alarming quantities of groundwater As. The present study aims to discuss the spatial and depth distribution of groundwater As and the role of dissolved organic carbon (DOC) in groundwaters at shallower to deeper...
Conference Paper
Full-text available
Matlab is one of the areas in SE Bangladesh highly affected with elevated concentrations of dissolved As in drinking waters. Matlab is stratigraphically composed of thick floodplain deposits of Holocene age overlying Plio-Pleistocene grey fine to coarse sands with considerable clay (Dupi Tila). The dissolved As concentrations in the studied area ra...
Conference Paper
Full-text available
Dissolved organic matter (DOM) is generally thought of as the labile carbon source and electron donor for microbial iron (Fe) and arsenic (As) reduction in reducing aquifers with elevated As concentration. The fulvic acid fraction of DOM is also biogeochemically important in reducing groundwater, and its presence is indicative of additional roles o...
Conference Paper
Full-text available
Geogenic contaminant As is released into groundwaters under anaerobic conditions following the reductive dissolution of iron-oxyhydroxide phases onto which As is initially adsorbed. The reactions are microbially mediated and the presence of labile organic carbon (LOC) is a critical, rate-limiting component of the As release process. In fact, such m...
Conference Paper
Dissolved organic matter (DOM) influences the fate of arsenic (As), a naturally occurring element of major health concern to millions of people in the world. Size exclusion chromatography and dialysis experiments have shown that in the presence of iron (Fe), DOM may either compete with As for adsorption sites and/or bind to form ternary complexes....
Thesis
Full-text available
Siloxanes are persistent, bio-accumulative and toxic emerging contaminants introduced to wastewater from common healthcare and biomedical products, and various industrial processes. They remain unchanged through wastewater treatment and a considerable portion ends up in surface waters through effluent discharge. 30 to 60 ng/L Decamethylcyclopentasi...