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Gu P, Wang Y, Zhang K, Wu H, Zhang W, Ding Y, Yang K, Zhang Z, Ren X, Miao H, Zheng Z. Cyanobacterial blooms control with CaO 2 in different stages: Inhibition efficiency, water quality optimization and microbial community changes. CHEMOSPHERE 2024; 353:141655. [PMID: 38460851 DOI: 10.1016/j.chemosphere.2024.141655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2024] [Revised: 02/29/2024] [Accepted: 03/04/2024] [Indexed: 03/11/2024]
Abstract
This study explored the feasibility of calcium peroxide (CaO2) to inhibit cyanobacterial blooms of the outbreak and dormancy stages. Our previous studies have found that CaO2 has a high inhibitory effect on cyanobacteria. In order to explore the application effect of CaO2 in actual cyanobacteria lake water, we conducted this study to clarify the effect of CaO2 on inhibiting cyanobacteria in outbreak and dormancy stages. The results showed that CaO2 inhibited the growth of cyanobacteria in the outbreak and dormancy stages by 98.7% and 97.6%, respectively. The main inhibitory mechanism is: (1) destroy the cell structure and make the cells undergo programmed cell death by stimulating the oxidation balance of cyanobacteria cells; (2) EPS released by cyanobacteria resist stimulation and combine calcium to form colonies, and accelerate cell settlement. In addition to causing direct damage to cyanobacteria, CaO2 can also improve water quality and sediment microbial diversity, and reduce the release of sediment to phosphorus, so as to further contribute to cyanobacterial inhibition. Finally, the results of qRT-PCR analysis confirmed the promoting effect of CaO2 on the downregulation of photosynthesis-related genes (rbcL and psaB), microcystn (mcyA and mcyD) and peroxiredoxin (prx), and verified the mechanism of CaO2 inhibition of cyanobacteria. In conclusion, this study provides new findings for the future suppression of cyanobacterial bloom, by combining water quality, cyanobacterial inhibition mechanisms, and sediment microbial diversity.
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Affiliation(s)
- Peng Gu
- School of Environment and Ecology, Jiangnan University, Wuxi, Jiangsu, 214122, PR China.
| | - Yuting Wang
- School of Environment and Ecology, Jiangnan University, Wuxi, Jiangsu, 214122, PR China.
| | - Kenian Zhang
- School of Environment and Ecology, Jiangnan University, Wuxi, Jiangsu, 214122, PR China.
| | - Hanqi Wu
- Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, PR China.
| | - Wanqing Zhang
- School of Environment and Ecology, Jiangnan University, Wuxi, Jiangsu, 214122, PR China.
| | - Yi Ding
- School of Environment and Ecology, Jiangnan University, Wuxi, Jiangsu, 214122, PR China.
| | - Kunlun Yang
- School of Environment and Ecology, Jiangnan University, Wuxi, Jiangsu, 214122, PR China.
| | - Zengshuai Zhang
- School of Environment and Ecology, Jiangnan University, Wuxi, Jiangsu, 214122, PR China.
| | - Xueli Ren
- School of Environment and Ecology, Jiangnan University, Wuxi, Jiangsu, 214122, PR China.
| | - Hengfeng Miao
- School of Environment and Ecology, Jiangnan University, Wuxi, Jiangsu, 214122, PR China.
| | - Zheng Zheng
- Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, PR China.
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2
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Xue M, Wang W, Gu X, Liu B, Jiao Y, Zhang W, Zhao C, Han Y, Tong Y. Identifying spatial variability of water chemical characteristics and groundwater discharge in Hulun Lake integrated remote sensing data and chemical components. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:10689-10701. [PMID: 38206462 DOI: 10.1007/s11356-023-31791-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Accepted: 12/23/2023] [Indexed: 01/12/2024]
Abstract
The frozen period interaction of groundwater and lakes is crucial for hydrological properties and aquatic ecology in cold and arid regions. In this study, we investigate the spatial hydrochemical characteristics, influencing factors in the Hulun Lake basin. The hydrochemical type of lake water exhibits Na-HCO3-SO4-Cl, while river shows a primary classification of Na-Ca-HCO3. Groundwater in the eastern and western regions is characterized by Na-SO4-Cl and Na-HCO3, respectively. Silicic acid and ion exchange predominantly influence groundwater chemistry in the western region, whereas evaporation and concentration play a major role in the eastern region. Total dissolved solids, Cl-, and F- emerge as the primary influencing factors of hydrochemical components in the Hulun Lake basin. Ion content decreased from the southern to the northern region, with the lowest value occurring near the Urson River. The high-temperature water body is primarily distributed in the central and southern regions of the lake. Based on characteristic ions and partial characteristics of ice surface temperature, the potential groundwater discharge areas near the inlet of the Xinkai River, the central and southern region are determined. This study reveals the hydrochemical characteristics, vertical ice distribution, and provides a scientific foundation for water resource management in cold and arid regions.
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Affiliation(s)
- Mengyong Xue
- School of Geographic Science, Nantong University, Nantong, 226019, China
- State of Environmental Protection Scientific Observation and Research Station for Ecological Environment of Hulun Lake Wetland, Hulunbuir, 021008, China
| | - Wenlin Wang
- State of Environmental Protection Scientific Observation and Research Station for Ecological Environment of Hulun Lake Wetland, Hulunbuir, 021008, China
- Ministry of Ecology and Environment of the People's Republic of China, Nanjing Institute of Environmental Sciences, Nanjing, 210042, China
| | - Xiaomin Gu
- School of Geographic Science, Nantong University, Nantong, 226019, China.
- State of Environmental Protection Scientific Observation and Research Station for Ecological Environment of Hulun Lake Wetland, Hulunbuir, 021008, China.
| | - Bo Liu
- School of Geographic Science, Nantong University, Nantong, 226019, China
- State of Environmental Protection Scientific Observation and Research Station for Ecological Environment of Hulun Lake Wetland, Hulunbuir, 021008, China
| | - Yanwen Jiao
- School of Geographic Science, Nantong University, Nantong, 226019, China
- State of Environmental Protection Scientific Observation and Research Station for Ecological Environment of Hulun Lake Wetland, Hulunbuir, 021008, China
| | - Wanchen Zhang
- School of Geographic Science, Nantong University, Nantong, 226019, China
- State of Environmental Protection Scientific Observation and Research Station for Ecological Environment of Hulun Lake Wetland, Hulunbuir, 021008, China
| | - Chuang Zhao
- School of Geographic Science, Nantong University, Nantong, 226019, China
- State of Environmental Protection Scientific Observation and Research Station for Ecological Environment of Hulun Lake Wetland, Hulunbuir, 021008, China
| | - Yujie Han
- School of Geographic Science, Nantong University, Nantong, 226019, China
- State of Environmental Protection Scientific Observation and Research Station for Ecological Environment of Hulun Lake Wetland, Hulunbuir, 021008, China
| | - Yi Tong
- State of Environmental Protection Scientific Observation and Research Station for Ecological Environment of Hulun Lake Wetland, Hulunbuir, 021008, China
- Ministry of Ecology and Environment of the People's Republic of China, Nanjing Institute of Environmental Sciences, Nanjing, 210042, China
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3
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Wan L, Kendall AD, Martin SL, Hamlin QF, Hyndman DW. Important Role of Overland Flows and Tile Field Pathways in Nutrient Transport. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:17061-17075. [PMID: 37871005 PMCID: PMC10634344 DOI: 10.1021/acs.est.3c03741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 08/23/2023] [Accepted: 09/25/2023] [Indexed: 10/25/2023]
Abstract
Nitrogen and phosphorus pollution is of great concern to aquatic life and human well-being. While most of these nutrients are applied to the landscape, little is known about the complex interplay among nutrient applications, transport attenuation processes, and coastal loads. Here, we enhance and apply the Spatially Explicit Nutrient Source Estimate and Flux model (SENSEflux) to simulate the total annual nitrogen and phosphorus loads from the US Great Lakes Basin to the coastline, identify nutrient delivery hotspots, and estimate the relative contributions of different sources and pathways at a high resolution (120 m). In addition to in-stream uptake, the main novelty of this model is that SENSEflux explicitly describes nutrient attenuation through four distinct pathways that are seldom described jointly in other models: runoff from tile-drained agricultural fields, overland runoff, groundwater flow, and septic plumes within groundwater. Our analysis shows that agricultural sources are dominant for both total nitrogen (TN) (58%) and total phosphorus (TP) (46%) deliveries to the Great Lakes. In addition, this study reveals that the surface pathways (sum of overland flow and tile field drainage) dominate nutrient delivery, transporting 66% of the TN and 76% of the TP loads to the US Great Lakes coastline. Importantly, this study provides the first basin-wide estimates of both nonseptic groundwater (TN: 26%; TP: 5%) and septic-plume groundwater (TN: 4%; TP: 2%) deliveries of nutrients to the lakes. This work provides valuable information for environmental managers to target efforts to reduce nutrient loads to the Great Lakes, which could be transferred to other regions worldwide that are facing similar nutrient management challenges.
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Affiliation(s)
- Luwen Wan
- Department
of Earth and Environmental Sciences, Michigan
State University, East Lansing, Michigan 48824, United States
| | - Anthony D. Kendall
- Department
of Earth and Environmental Sciences, Michigan
State University, East Lansing, Michigan 48824, United States
| | - Sherry L. Martin
- Department
of Earth and Environmental Sciences, Michigan
State University, East Lansing, Michigan 48824, United States
| | - Quercus F. Hamlin
- Department
of Earth and Environmental Sciences, Michigan
State University, East Lansing, Michigan 48824, United States
| | - David W. Hyndman
- Department
of Earth and Environmental Sciences, Michigan
State University, East Lansing, Michigan 48824, United States
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Brewton RA, Kreiger LB, Tyre KN, Baladi D, Wilking LE, Herren LW, Lapointe BE. Septic system-groundwater-surface water couplings in waterfront communities contribute to harmful algal blooms in Southwest Florida. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 837:155319. [PMID: 35452738 DOI: 10.1016/j.scitotenv.2022.155319] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 04/11/2022] [Accepted: 04/12/2022] [Indexed: 06/14/2023]
Abstract
As human population growth has expanded in Southwest Florida, water quality has become degraded with an increased occurrence of harmful algal blooms (HABs). Red tide (Karenia brevis) originating offshore, intensifies in nearshore waters along Florida's Gulf Coast, and blue-green algae (Microcystis spp.) originating in Lake Okeechobee is discharged into the Caloosahatchee River. These HABs could be enhanced by anthropogenic nitrogen (N) and phosphorus (P) from adjacent watersheds. North Fort Myers is a heavily developed, low-lying city on the Caloosahatchee River Estuary serviced by septic systems with documented nutrient and bacterial pollution. To identify sources of pollution within North Fort Myers and determine connections with downstream HABs, this multiyear (2017-2020) study examined septic system- groundwater- surface water couplings through the analysis of water table depth, nutrients (N, P), fecal indicator bacteria (FIB), molecular markers (HF183, GFD, Gull2), chemical tracers (sucralose, pharmaceuticals, herbicides, pesticides), stable isotopes of groundwater (δ15N-NH4, δ15N-NO3) and particulate organic matter (POM; δ15N, δ13C), and POM elemental composition (C:N:P). POM samples were also collected during K. brevis and Microcystis spp. HAB events. Most (>80%) water table depth measurements were too shallow to support septic system functioning (<1.07 m). High concentrations of NH4+ and NOx, up to 1094 μM and 482 μM respectively, were found in groundwater and surface water. δ15N values of groundwater (+4.7‰) were similar to septic effluent (+4.9‰), POM (+4.7‰), and downstream HABs (+4.8 to 6.9‰), indicating a human waste N source. In surface water, FIB were elevated and HF183 was detected, while in groundwater and surface water sucralose, carbamazepine, primidone, and acetaminophen were detected. These data suggest that groundwater and surface water in North Fort Myers are coupled and contaminated by septic system effluent, which is negatively affecting water quality and contributing to the maintenance and intensification of downstream HABs.
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Affiliation(s)
- Rachel A Brewton
- Harbor Branch Oceanographic Institute, Florida Atlantic University, 5600 US 1, Fort Pierce, FL 34946, USA.
| | - Lisa B Kreiger
- Lee County Division of Natural Resources, 1500 Monroe St, Fort Myers, FL 33901, USA
| | - Kevin N Tyre
- Harbor Branch Oceanographic Institute, Florida Atlantic University, 5600 US 1, Fort Pierce, FL 34946, USA
| | - Diana Baladi
- Harbor Branch Oceanographic Institute, Florida Atlantic University, 5600 US 1, Fort Pierce, FL 34946, USA
| | - Lynn E Wilking
- Harbor Branch Oceanographic Institute, Florida Atlantic University, 5600 US 1, Fort Pierce, FL 34946, USA
| | - Laura W Herren
- Harbor Branch Oceanographic Institute, Florida Atlantic University, 5600 US 1, Fort Pierce, FL 34946, USA
| | - Brian E Lapointe
- Harbor Branch Oceanographic Institute, Florida Atlantic University, 5600 US 1, Fort Pierce, FL 34946, USA
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5
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Rakhimbekova S, O'Carroll DM, Robinson CE. Factors controlling phosphorus mobility in nearshore aquifers adjacent to large lakes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 799:149443. [PMID: 34371419 DOI: 10.1016/j.scitotenv.2021.149443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 07/12/2021] [Accepted: 07/30/2021] [Indexed: 06/13/2023]
Abstract
Internal P stores in offshore lakebed sediments play an important role in lake nutrient dynamics. While P stores in nearshore aquifer sediments may also be important for nutrient dynamics, it is unclear whether P accumulates in these sediments, and if so, what factors control P accumulation and its potential later release from the sediments to nearshore waters. This knowledge gap was addressed by conducting field investigations at seven nearshore sites located along the shores of Lake Erie, Lake Huron and Lake Ontario, Canada, with more detailed dissolved and sediment phase characterization completed for two nearshore sites. PO4 concentrations were observed to be higher (>50 μg/L) in the more reducing nearshore aquifers compared to more oxidizing nearshore aquifers (<20 μg/L), despite similar total solid phase P concentrations at the sites. PO4 mobility in the nearshore aquifers was found to be closely linked to redox-driven Fe cycling. In the more reducing aquifers, dissolved PO4 was highest near the redox boundary present in the shallow sediments where oxic infiltrating surface water mixes with reducing groundwater. In the more oxidizing aquifers, solid phase characterization indicated that PO4 is sequestered to Fe oxide mineral phases throughout the nearshore aquifer which explains the low dissolved PO4. While pH was not found to be important for PO4 mobility at the study sites, batch laboratory experiments indicate that increased infiltration of more alkaline surface water into nearshore aquifers may promote PO4 release from the sediments. The study findings demonstrate that while internal P storage mechanisms in nearshore aquifer sediments may currently be limiting P loads to lakes, it is possible that P stores that build up over time may result in increased P loads to lakes in the future.
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Affiliation(s)
- Sabina Rakhimbekova
- Department of Civil and Environmental Engineering, Western University, London, Ontario N6A 3K7, Canada
| | - Denis M O'Carroll
- School of Civil and Environmental Engineering, Water Research Centre, University of New South Wales, Manly Vale, NSW 2093, Australia
| | - Clare E Robinson
- Department of Civil and Environmental Engineering, Western University, London, Ontario N6A 3K7, Canada.
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Rakhimbekova S, O'Carroll DM, Robinson CE. Occurrence of Arsenic in Nearshore Aquifers Adjacent to Large Inland Lakes. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:8079-8089. [PMID: 34043335 DOI: 10.1021/acs.est.1c02326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Metal oxides that form near sediment-water interfaces in marine and riverine settings are known to act as a sediment trap for pollutants of environmental concern (e.g., arsenic and mercury). The occurrence of these pollutant traps near sediment-water interfaces in nearshore lake environments is unclear yet important to understand because they may accumulate pollutants that may be later released as environmental conditions change. This study evaluates the prevalence of pollutant sediment traps in nearshore aquifers adjacent to large lakes and the factors that affect the accumulation and release of pollutants, specifically arsenic. Field data from six sites along the Laurentian Great Lakes indicate widespread enrichment of arsenic in nearshore aquifers with arsenic sequestered to iron oxide phases. Arsenic enrichment at all sites (solid-phase arsenic >2 μg/g) suggests that this is a naturally occurring phenomenon. Arsenic was more mobile in reducing aquifers with elevated dissolved arsenic (up to 60 μg/L) observed, where reducing groundwater mixes with infiltrating oxic lake water. Dissolved arsenic was low (<3 μg/L) in all oxic nearshore aquifers studied despite high solid-phase arsenic concentrations. The findings have broad implications for understanding the widespread accumulation of reactive pollutants in nearshore aquifers and factors that affect their release to large lakes.
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Affiliation(s)
- Sabina Rakhimbekova
- Department of Civil and Environmental Engineering, Western University, London, N6A 5B9 Ontario, Canada
| | - Denis M O'Carroll
- School of Civil and Environmental Engineering, Water Research Centre, University of New South Wales, Manly Vale, 2093 New South Wales, Australia
| | - Clare E Robinson
- Department of Civil and Environmental Engineering, Western University, London, N6A 5B9 Ontario, Canada
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