A5103010959- Groundwater and Isotope Geochemistry
- Water Treatment and Disinfection
- Wastewater Treatment and Nitrogen Removal
- Chemical Analysis and Environmental Impact
- Algal biology and biofuel production
- Ecosystem dynamics and resilience
- Groundwater flow and contamination studies
- Marine and coastal ecosystems
- Soil and Water Nutrient Dynamics
- Peatlands and Wetlands Ecology
- Mine drainage and remediation techniques
- Hydrocarbon exploration and reservoir analysis
- Sustainability and Ecological Systems Analysis
- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine Biology and Ecology Research
- Atmospheric and Environmental Gas Dynamics
- Ecology and Vegetation Dynamics Studies
- Hydraulic Fracturing and Reservoir Analysis
- Land Use and Ecosystem Services
- Soil erosion and sediment transport
- Fluid Dynamics and Mixing
- Legionella and Acanthamoeba research
- Risk and Safety Analysis
- Evolutionary Game Theory and Cooperation
- Nuclear and radioactivity studies
Chengdu Institute of Biology
2023-2024
Chinese Academy of Sciences
2023-2024
Lawrence Berkeley National Laboratory
2014-2021
Ecosystem Sciences
2019
NASA Earth Science
2018
Georgia Institute of Technology
2010-2012
Microbial souring in oil reservoirs produces toxic, corrosive hydrogen sulfide through microbial sulfate reduction, often accompanying (sea)water flooding during secondary recovery. With data from column experiments as constraints, we developed the first reactive-transport model of a new candidate inhibitor, perchlorate, and compared it with commonly used nitrate. Our provided good fit to data, which suggest that perchlorate is more effective than nitrate on per mole inhibitor basis....
[1] Wetland ecosystems are often characterized by distinct vegetation patterns. Various mechanisms have been proposed to explain the formation of these patterns; including spatially variable peat accumulation and water ponding. Recently, short-range facilitation long-range competition for resources (a.k.a scale dependent feedback) has as a possible mechanism pattern in wetland ecosystems. We modify an existing, explicit, advection-reaction-diffusion model include regional hydraulic gradient...
Microbial sulfate reduction in oil reservoirs (biosouring) is often associated with secondary production where seawater containing high concentrations (~28 mM) injected into a reservoir to maintain pressure and displace oil. The sulfide generated from biosouring can cause corrosion of infrastructure, health exposure risks, higher costs. Isotope monitoring promising approach for understanding microbial sulfur cycling reservoirs, enabling early detection biosouring, the impact souring. known...
Key Points VELMA is an easy to use, spatially distributed eco‐hydrology model Post‐harvest losses of nutrients consist primarily DIN
Biogenesis of hydrogen sulfide (H2S) (microbial souring) has detrimental impacts on oil production operations and can cause health safety problems. Understanding the processes that control rates patterns sulfate reduction is crucial in developing a predictive understanding reservoir souring associated mitigation processes. This work demonstrates an approach to utilize genomic information constrain biological parameters needed for modeling souring, providing pathway using microbial data...
Abstract Increasing occurrence of harmful algal blooms across the land–water interface poses significant risks to coastal ecosystem structure and human health. Defining drivers their interactive impacts on allows for more effective analysis identification specific conditions supporting phytoplankton growth. A novel iterative Random Forests (iRF) machine-learning model was developed applied two example cases along California coast identify key stable interactions: (1) abundance in response...
Biosouring is commonly encountered during secondary oil recovery when seawater or another high sulfate water source utilized for flooding; as a result, effective souring control of great interest to the industry. Here we describe laboratory study evaluate relative effectiveness interventions through injection nitrate, chlorate and perchlorate, collectively (per)chlorate, solutions whether in-situ galvanic potential measurements can be used convenient quantitative tracking sulfide dynamics....
Hydrogen sulfide production by sulfate reducing bacteria (SRB) is the primary cause of oil reservoir souring. Amending environments with chlorate or perchlorate [collectively denoted (per)chlorate] represents an emerging technology to prevent onset Recent studies (PRB) monocultures demonstrated that they have innate capability enzymatically oxidize sulfide, thus PRB may offer effective means reversing (Per)chlorate be (i) direct toxicity SRB; (ii) competitive exclusion SRB PRB; (iii)...
The capillary fringe is a subsurface terrestrial-aquatic interface that can be significant hotspot for biogeochemical cycling of terrestrially derived organic matter and nutrients. However, pathways nitrogen (N) within this environment are poorly understood, observations temporal fluctuations in nitrate (NO3 ) concentrations lack the necessary resolution to partition between biotic or abiotic mechanisms. At discrete sampling points we measured NO3 , nitrite (NO2 ), ammonium (NH4 +), gaseous...
Microbial sulfate reduction occurs ubiquitously in natural environments. In oil and gas reservoirs, the generation of sulfide (also known as souring) can result corrosion steel infrastructure downgrading quality, among other environmental health-related concerns. The complex interplay between hydrological, geochemical, biological processes during souring is poorly understood, preventing effective treatment mitigation especially naturally heterogeneous subsurfaces. this work,...
Hydrogen sulfide is a toxic and corrosive gas, produced by the activity of sulfate-reducing microorganisms (SRM). Owing to environmental, economic human-health consequences sulfide, there interest in developing specific inhibitors SRM. Recent studies have identified perchlorate as promising emerging inhibitor. The aim this work quantitatively dissect inhibitory dynamics perchlorate. Sulfidogenic mixed continuous-flow systems were treated with SRM number, production community structure...
Abstract A simple model is developed to evolve daily ground temperatures from surface air (SATs) in snow-dominated areas. Ground (GSTs) are calculated by propagating the SAT through snowpack, and attenuating signal amplitude. Subsequent subsurface heat transfer then modeled using analytical solution of one-dimensional conduction equation. The thermal impacts nonconductive processes seasonal freeze thaw implicitly represented time-dependent apparent diffusivity subsurface. tested four...
Subsurface biological processes, such as biofilm development, modify flow and permeability in fractured rocks, greatly impacting energy production or treatment efficiencies. This study aims to understand biological–hydrological interactions at a bench scale during the progression of souring (microbially mediated sulfide production). Few bench-scale studies investigate role on evolution, sulfidogensis, nitrate efficacy rocks. Our experiment consisted three sandstone columns that represent...
Flow-through fractures dominate the movement of fluids in a variety natural as well engineered subsurface systems. Microbial activities fractured rock impact energy recovery, storage, and waste disposal. It has been recognized that understanding how contrasting permeability between fracture matrix interacts with microbial metabolism under thermal hydrological gradients is key to effective utilization subsurface, yet such studies are sparse. Microorganisms mediate production hydrogen sulfide...
Abstract A key step in the chlorine cycle is reduction of perchlorate (ClO 4 - ) and chlorate 3 to chloride by microbial respiratory pathways. Perchlorate-reducing bacteria chlorate-reducing differ that latter cannot use perchlorate, most oxidized compound. However, a recent study identified bacterium with pathway dominating community provided only perchlorate. Here we confirm metabolic interaction between perchlorate- define its mechanism. supported growth up 90% total cells communities...