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Water publishes Special Issues to create collections of papers on specific topics, with the aim of building a community of authors and readers to discuss the latest research and develop new ideas and research directions. Special Issues are led by Guest Editors, who are experts on the topic and all Special Issue submissions follow MDPI's standard editorial process. The journal’s Editor-in-Chief and/or designated Editorial Board Member will oversee Guest Editor appointments and Special Issue proposals, checking their content for relevance and ensuring the suitability of the material for the journal. The papers published in a Special Issue will be collected and displayed on a dedicated page of the journal’s website. Further information on MDPI's Special Issue policies and Guest Editor responsibilities can be found here. For any inquiries related to a Special Issue, please contact the Editorial Office.

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Advanced Biotechnologies for Water and Wastewater Treatment, 2nd Edition submission deadline 20 Oct 2025 | 9 articles | Viewed by 14072 | Submission Open
Keywords: biotechnologies for water treatment; biotechnologies for wastewater treatment; advanced water treatment; advanced wastewater treatment; nutrient recovery from wastewater; energy recovery from wastewater; emerging contaminants in water and wastewater treatment; industrial waste treatment; municipal wastewater treatment; water reuse; water treatment
(This special issue belongs to the Section Wastewater Treatment and Reuse)
Climate Change and Hydrological Processes, 2nd Edition submission deadline 20 Oct 2025 | 9 articles | Viewed by 13007 | Submission Open
Keywords: climate change scenarios; extreme events; risk assessment; multivariate analysis; artificial intelligence models
(This special issue belongs to the Section Hydrology)
Hydraulics and Hydrodynamics in Fluid Machinery, 2nd Edition
edited by
submission deadline 20 Oct 2025 | 8 articles | Viewed by 7925 | Submission Open
Keywords: hydraulics; hydrodynamics; pumps; compressors; turbo-machinery system; fans and blowers; hydro-turbine; propulsion; jet; cavitation and multi-phase flow; renewable energy; optimization
(This special issue belongs to the Section Hydraulics and Hydrodynamics)
Collaborative Monitoring and Remediation of Mine or Industrial Soils and Water
edited by and Baogang Zhang
submission deadline 20 Oct 2025 | 3 articles | Viewed by 5841 | Submission Open
Keywords: industrial wastewater; mining wastewater; pollution monitoring; soil and water remediation; wastewater treatment; heavy metal pollution
(This special issue belongs to the Section Soil and Water)
Soil and Groundwater Quality and Resources Assessment, 2nd Edition
edited by , and Hairu Mao
submission deadline 20 Oct 2025 | 7 articles | Viewed by 4917 | Submission Open
Keywords: multiple contaminants; source apportionment; migration– transformation; ecological health risks; soil– groundwater system
(This special issue belongs to the Section Soil and Water)
Design and Management of Water Distribution Systems submission deadline 20 Oct 2025 | 2 articles | Viewed by 4136 | Submission Open
Keywords: water distribution systems; optimization; machine learning; transient flows; uncertainty quantification
(This special issue belongs to the Section Urban Water Management)
Groundwater Thermal Monitoring and Modeling
edited by Chuanqing Zhu, and Yonghui Huang
submission deadline 20 Oct 2025 | 2 articles | Viewed by 2515 | Submission Open
Keywords: groundwater; thermal monitoring; modeling; rock thermal conductivity; geothermal field distribution; paleo-geothermal; environmental impact
(This special issue belongs to the Section Hydrogeology)
Metal Elements and Wastewater Treatment: Adsorption, Catalysis and Oxidation
edited by
submission deadline 20 Oct 2025 | 2 articles | Viewed by 1990 | Submission Open
Keywords: metal material; wastewater remediation; catalytic oxidation; adsorption; risk assessment
(This special issue belongs to the Section Wastewater Treatment and Reuse)
Advanced Technologies in Agricultural Water-Saving Irrigation
edited by
submission deadline 20 Oct 2025 | 1 articles | Viewed by 1208 | Submission Open
Keywords: agricultural water-saving irrigation; smart irrigation; precision agriculture; IoT applications; water– energy– food nexus; non-conventional water resources; climate change adaptation; sustainable water management
(This special issue belongs to the Section Water, Agriculture and Aquaculture)
Monitoring, Restoration and Protection in Wetland Ecosystems submission deadline 20 Oct 2025 | Viewed by 815 | Submission Open
Keywords: blue carbon ecosystems; coastal wetlands; wetland monitoring; climate resilience; extreme weather; nature-based solutions; carbon sequestration; bioengineering and restoration; community-led conservation; carbon credit mechanisms
(This special issue belongs to the Section Biodiversity and Functionality of Aquatic Ecosystems)
Advanced Research on Digital Twins in Hydro Systems
edited by Jürgen Stamm and
submission deadline 20 Oct 2025 | Viewed by 388 | Submission Open
Keywords: digital twin technology; hydrological modeling; flood risk assessment; smart water management; urban flood miti-gation; real-time monitoring; integrated water systems; predictive analytics for water systems; sustainable hydro-power operations; climate resilience in hydro systems
(This special issue belongs to the Section Hydrology)
Recent Advances in Membrane Technology for Water Treatment
edited by and Dawei Zhang
submission deadline 20 Oct 2025 | Viewed by 357 | Submission Open
Keywords: ultrafiltration; nanofiltration; reverse osmosis; forward osmosis; thin-film nanocomposite membrane; membrane fouling mitigation; membrane fouling model; membrane fabrication techniques; gravity driven membrane; separation process; 3D printing in membrane technology; electrospinning for membrane production; hybrid membrane systems; emerging contaminant removal; energy-efficient membrane processes; sustainable water treatment solutions
(This special issue belongs to the Section Wastewater Treatment and Reuse)
Geophysical Methods for Earth Critical Zone Observations submission deadline 20 Oct 2025 | Viewed by 342 | Submission Open
Keywords: earth critical zone; geophysics; modeling; interdisciplinary approach  
(This special issue belongs to the Section Soil and Water)
Evaluation and Applications of Hydrologic Modeling in Catchment
edited by and Qing Cao
submission deadline 20 Oct 2025 | Viewed by 205 | Submission Open
Keywords: hydrologic modeling; catchment hydrology; rainfall runoff modeling; water quality modeling; climate change impact
(This special issue belongs to the Section Hydrology)
Advanced Hydrogel for Water Treatment (2nd Edition)
edited by
submission deadline 20 Oct 2025 | Viewed by 188 | Submission Open
Keywords: hydrogel; desalination; atmospheric condensation; heavy metal ions; organics removal; water treatment
(This special issue belongs to the Section Wastewater Treatment and Reuse)
Risk Assessment of Aquatic Ecosystem Health
edited by
submission deadline 20 Oct 2025 | Viewed by 157 | Submission Open
Keywords: water quality; ecological risk; ecological assessment; ecosystem health; water quality criteria
(This special issue belongs to the Section Water Quality and Contamination)
Analysis of Extreme Precipitation Under Climate Change
edited by
submission deadline 25 Oct 2025 | 8 articles | Viewed by 17683 | Submission Open
Keywords: extreme precipitation; climate change; downscaling; compound events; hydrological impact
(This special issue belongs to the Section Water and Climate Change)
Applications of Artificial Intelligence (AI) in Water Resources Systems
edited by
submission deadline 25 Oct 2025 | 7 articles | Viewed by 16853 | Submission Open
Keywords: water resources systems; artificial intelligence; modeling; optimization; water distribution systems
(This special issue belongs to the Section Urban Water Management)
Methods and Tools for Sustainable Agricultural Water Management
edited by Hui Yang, Manoj K. Shukla and
submission deadline 25 Oct 2025 | 8 articles | Viewed by 13058 | Submission Open
Keywords: crop water relations; water productivity; deficit/salinity irrigation; conservation agriculture; regional water management
(This special issue belongs to the Section Water Resources Management, Policy and Governance)
Contaminants of Emerging Concern in Soil and Water Environment submission deadline 25 Oct 2025 | 3 articles | Viewed by 7876 | Submission Open
Keywords: pharmaceuticals; nanomaterials; personal care products; hormones; flame retardants; plasticizers; per- and polyfluoroalkyl substances (PFASs); microplastics; abiotic compartments
(This special issue belongs to the Section Soil and Water)
Application of Biotechnology in Water Treatment and Specific Treatments for Water Reuse
edited by and Baghdad Ouddane
submission deadline 25 Oct 2025 | 4 articles | Viewed by 6867 | Submission Open
Keywords: biotechnology; water treatment; secondary treatment; organic micropollutant; metallic trace element; activated sludge; biological treatment; nature-based solutions; constructed wetlands and biofiltration systems
(This special issue belongs to the Section Wastewater Treatment and Reuse)
Water Quality Monitoring and Prediction Using New Sensors, Machine Learning and Big Data
edited by Yong Jie Wong
submission deadline 25 Oct 2025 | 2 articles | Viewed by 4211 | Submission Open
Keywords: water quality monitoring; prediction technologies; advanced sensors; machine learning; big data analytics; remote sensing; Internet of Things (IoT); environmental monitoring; water resource management
(This special issue belongs to the Section New Sensors, New Technologies and Machine Learning in Water Sciences)
Constructed Wetland Systems for Wastewater Treatment and Water Remediation
edited by Haiming Wu
submission deadline 25 Oct 2025 | 3 articles | Viewed by 4019 | Submission Open
Keywords: constructed wetland; domestic and municipal wastewater; micro-polluted water; emerging pollutants; water reuse; global climate change; carbon sink function; biogeochemical processes; selection of plants and substrates; ecosystem services; microbial communities; operation and management
(This special issue belongs to the Section Wastewater Treatment and Reuse)
The Biogeochemical Behavior and Innovative Remediation of Contaminants
edited by Zhuozhi Ouyang and Yanjun Liu
submission deadline 25 Oct 2025 | 1 articles | Viewed by 1124 | Submission Open
Keywords: pollutants; biogeochemical behavior; functional materials; remediation; risk assessment; ecosystems
(This special issue belongs to the Section Soil and Water)
Groundwater Flow and Contaminant Transport Modeling
edited by Xingyuan Chen
submission deadline 25 Oct 2025 | Viewed by 296 | Submission Open
Keywords: groundwater hydrology; flow and reactive transport; numerical modeling; machine learning; disturbance impacts; surface water and groundwater interactions
(This special issue belongs to the Section Hydrogeology)
Microbial Technology Applied in Wastewater Treatment
edited by and Limin Yang
submission deadline 25 Oct 2025 | Viewed by 222 | Submission Open
Keywords: wastewater; microorganism; metabolism; biotechnology; biomass valorization; agriculture; aquaculture; industry
(This special issue belongs to the Section Wastewater Treatment and Reuse)
Flow Dynamics and Sediment Transport in Rivers and Coasts
edited by , and Jun Wang
submission deadline 30 Oct 2025 | 6 articles | Viewed by 5320 | Submission Open
Keywords: eco-hydraulics; fluvial hydraulics; local scour; riverbed deformation; sediment transport; turbulence; wave dynamics
(This special issue belongs to the Section Hydraulics and Hydrodynamics)
Soil Erosion Measurement Techniques and Field Experiments, 2nd Edition
edited by and
submission deadline 31 Oct 2025 | 7 articles | Viewed by 12793 | Submission Open
Keywords: soil erosion; sediment yield; erosion plot; basin; interrill erosion; rill erosion; gully erosion
(This special issue belongs to the Section Soil and Water)
Novel Methods in Wastewater and Stormwater Treatment
edited by
submission deadline 31 Oct 2025 | 7 articles | Viewed by 9947 | Submission Open
Keywords: wastewater treatment; stormwater harvesting; stormwater treatment processes; heavy metals; pollutants and contaminants; toxicity; sustainability; smart cities; constructed wetlands; managing urban stormwater; pollutant load
(This special issue belongs to the Section Wastewater Treatment and Reuse)
Water Modeling Using Combined Machine Learning and Fieldwork Investigation
edited by , and Netra Regmi
submission deadline 31 Oct 2025 | 6 articles | Viewed by 7455 | Submission Open
Keywords: machine learning; field survey; water modeling; big data analysis; geostatistic analysis; water quality and water quantity; environmental sustainability
(This special issue belongs to the Section New Sensors, New Technologies and Machine Learning in Water Sciences)
Soil–Water Interaction and Management
edited by and Zhanbin Luo
submission deadline 31 Oct 2025 | 3 articles | Viewed by 4109 | Submission Open
Keywords: soil moisture; soil– water management; irrigation systems; drought conditions; climate change
(This special issue belongs to the Section Soil and Water)
Dynamic Response of Water and Soil Resources in the Context of Climate Change and Human Activities
edited by Yudong Lu, Huanhuan Li and Ce Zheng
submission deadline 31 Oct 2025 | 3 articles | Viewed by 3187 | Submission Open
Keywords: water and soil resources security; water– soil interactions; climate change impacts on water and soil; anthropogenic stressors to water and soil; hydrological modeling; soil degradation; pollution remediation; sustainable agriculture; ecosystem resilience; land-use change
(This special issue belongs to the Section Soil and Water)
Electrochemical Approaches to Sustainable Water Treatment: Tackling Pollution and Advancing Resource Recovery
edited by
submission deadline 31 Oct 2025 | 2 articles | Viewed by 1930 | Submission Open
Keywords: electrochemical wastewater treatment; resource recovery; electrooxidation; electroreduction; heavy metal complexes; nitrate; phosphorus; electro-Fenton; PFAS; refractory organics; high salinity wastewater
(This special issue belongs to the Section Wastewater Treatment and Reuse)
Wastewater-Based Epidemiology (WBE) Research, 2nd Edition
edited by and
submission deadline 31 Oct 2025 | 1 articles | Viewed by 1839 | Submission Open
Keywords: new biomarkers for WBE; new applications of WBE; early warning of infectious disease; monitoring substances of abuse; method uncertainties; health risk assessments
(This special issue belongs to the Section Water and One Health)
Constructed Wetlands: Enhancing Contaminant Removal and Remediation
edited by and
submission deadline 31 Oct 2025 | 1 articles | Viewed by 1366 | Submission Open
Keywords: removal of nutrients and refractory organic matter by constructed wetlands; development and application of novel wetland fillers or matrices; screening of aquatic plants for constructed wetlands; main problems and solutions of constructed wetland for wastewater treatment; integration of constructed wetlands and other water treatment technologies
(This special issue belongs to the Section Wastewater Treatment and Reuse)
Marine Waters for Health and Well-Being
edited by and Vincent Blanckaert
submission deadline 31 Oct 2025 | Viewed by 266 | Submission Open
Keywords: seawater; marine waters; deep seawater; marine colloids; algae; cosmetics; nutraceutics; pharmaceutics; thalassotherapy; marine biotechnology
(This special issue belongs to the Section Water and One Health)
Environmental Adaptability and Ecological Synergy in Offshore Renewable Energy Engineering
edited by Sheng Wu, Yanhui Wang and Chongyang Xu
submission deadline 31 Oct 2025 | Viewed by 169 | Submission Open
Keywords: marine new energy engineering; offshore new energy engineering; environmental adaptability; marine ecological impacts; complex fluid dynamics; environmental monitoring
(This special issue belongs to the Section Oceans and Coastal Zones)
Pollution Mechanisms and Source Apportionment of Typical Pollutants in Aquatic Environments
edited by Qianqian Zhang
submission deadline 5 Nov 2025 | 8 articles | Viewed by 5343 | Submission Open
Keywords: rivers; lakes; and groundwater; water quality; hydrochemistry; pollution sources; sources analysis; assessment methods; isotope technology; machine learning; multivariate statistical techniques; models
(This special issue belongs to the Section Water Quality and Contamination)
Artificial Intelligence for Sustainable Management of Groundwater Resources: New Developments, Challenges and Untapped Potentials
edited by Claudia Cherubini
submission deadline 10 Nov 2025 | 4 articles | Viewed by 8320 | Submission Open
Keywords: artificial intelligence; groundwater management; groundwater heads; contaminant transport; saltwater intrusion; optimization of monitoring networks
(This special issue belongs to the Section Hydrogeology)
Protection and Restoration of Lake and Water Reservoir
edited by Xiaoxiao Wang
submission deadline 10 Nov 2025 | 2 articles | Viewed by 1553 | Submission Open
Keywords: riparian restoration; water quality; nutrient cycling; sediment management; freshwater ecosystems; climate change; sustainable management; ecological resilience
(This special issue belongs to the Section Biodiversity and Functionality of Aquatic Ecosystems)
Digital Twin Technologies for Advanced Wastewater Treatment Operation and Control
edited by and Qadeer Akbar Sial
submission deadline 10 Nov 2025 | Viewed by 921 | Submission Open
Keywords: digital twins; water treatment; wastewater treatment; water resource recovery facility; water distribution; sewer systems; optimization; process modeling; artificial intelligence; machine learning; industrial internet of things; pre-dictive maintenance; smart water; big data
(This special issue belongs to the Section Wastewater Treatment and Reuse)
Sustainable Remediation of Pesticides in Contaminated Water and Sites
edited by and Deyang Kong
submission deadline 10 Nov 2025 | Viewed by 395 | Submission Open
Keywords: pesticide pollution; emerging contaminants; environmental behavior; sustainable remediation techniques; water remediation; site remediation; compound stable isotope analysis (CSIA); sustainable management strategies
(This special issue belongs to the Section Water Quality and Contamination)
Water and Society: Challenges for Freshwater Quality Under a Climate Change Scenario submission deadline 12 Nov 2025 | 5 articles | Viewed by 4830 | Submission Open
Keywords: climate change; freshwater ecosystems; water quality; societal challenges
(This special issue belongs to the Section Water Quality and Contamination)
Coastal Engineering and Fluid–Structure Interactions
edited by and
submission deadline 15 Nov 2025 | 7 articles | Viewed by 6546 | Submission Open
Keywords: coastal engineering; wave– structure interactions; high-fidelity numerical modeling; laboratory and field experiments; mathmatical models; harbors; coastal; and offshore structures; nature-based solutions; hydrodynamics; wave loads; wave overtopping
(This special issue belongs to the Section Oceans and Coastal Zones)
Impacts of Environmental Change and Human Activities on Aquatic Ecosystems, 2nd Edition
edited by , and Qian Zhang
submission deadline 15 Nov 2025 | 3 articles | Viewed by 2828 | Submission Open
Keywords: aquatic ecosystems; migration and transformation; source identification; risk assessment; sustainable development
(This special issue belongs to the Section Biodiversity and Functionality of Aquatic Ecosystems)
Revolutionizing Hydraulic Fracturing with Machine Learning and Data-Driven Approaches
edited by , Huiying Tang and Junchao Li
submission deadline 15 Nov 2025 | 1 articles | Viewed by 771 | Submission Open
Keywords: hydraulic fracturing; machine learning; data-driven; geomechanics; fluid flow; modeling and simulation; optimization
(This special issue belongs to the Section New Sensors, New Technologies and Machine Learning in Water Sciences)
Saline Water Irrigation and the Impact of Salt Stresses on Plants
edited by
submission deadline 15 Nov 2025 | Viewed by 167 | Submission Open
Keywords: saline irrigation; salt tolerance; crop yield; irrigation techniques; soil amendments; halophytic plants; microbial in-oculants; remote sensing; precision irrigation; plant resilience
(This special issue belongs to the Section Water, Agriculture and Aquaculture)
Risks of Hydrometeorological Extremes
edited by and Kazeem Abiodun Ishola
submission deadline 20 Nov 2025 | 6 articles | Viewed by 17536 | Submission Open
Keywords: hydrometeorological extremes and impacts; climate change; flood risk assessment; drought mitigation; extreme weather events; hydrological modelling; climate models and projections; climate resilience; forecasting techniques including the use of artificial intelligence; risk management; adaptive strategies
(This special issue belongs to the Section Water and Climate Change)
Groundwater Quality and Contamination at Regional Scales submission deadline 20 Nov 2025 | 8 articles | Viewed by 14757 | Submission Open
Keywords: groundwater quality; groundwater contamination; human activities; land use; assessment of groundwater quality; natural background levels; evaluation of groundwater contamination; geostatistical techniques
(This special issue belongs to the Section Hydrogeology)
Advances in Management and Optimization of Urban Water Networks
edited by , , Mohsen Shahandashti and Milad Latifi
submission deadline 20 Nov 2025 | 7 articles | Viewed by 11067 | Submission Open
Keywords: water distribution; urban drainage; stormwater networks; sewer networks; optimization; resilience; sustainable management; water quality; critical infrastructure; technological innovations
(This special issue belongs to the Section Urban Water Management)
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