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Open research questions in Wastewater Treatment and Reuse

132 gap statements mined from Wastewater Treatment and Reuse papers in our 4.5M-paper local library, which holds 875 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • The study highlights the need for integrated approaches to evaluate drain water quality.

    Decoding seasonal irrigation suitability of drain water using integrated indexical, statistical, graphical and machine learning approaches · 2026 · DOI

  • The study identifies technical challenges, including the need for compact and simple design, and the requirement for significant space for certain treatment systems. The study notes economic challenges, including high investment and technical skill requirements. The study highlights cultural and regulatory challenges, including cultural resistance to water reuse and inadequate regulatory comparative assessments.

    Comparative Evaluation of Graywater Treatment Technologies for Hammam Water Reuse in Urban Areas · 2026 · DOI

  • Further studies should investigate the effectiveness of different treatment methods for greywater recycling. Research should focus on scaling up greywater reuse initiatives. Studies should evaluate the economic and environmental benefits of greywater reuse.

    Greywater Quality Assessment and Reuse Potential in Mymensingh: Towards Sustainable Urban Water Use · 2026 · DOI

  • The lack of investments in wastewater infrastructure, adoption of innovative sanitation systems, environmental education, and robust policy frameworks limits the implementation of sustainable wastewater treatment technologies. Rapid urbanization, climate change, industrial pollution, and population growth threaten global water security.

    Water and Wastewater Treatment Technologies: Sustainable Approaches for Clean Water Access and Environmental Protection · 2026 · DOI

  • The data clearly indicate that the population of the municipality is exposed to microbiological risk, and therefore, it is necessary to implement additional risk control measures at the household level, such as boiling water before use or disinfecting in any other way possible.

    Sustaining drinking water quality in water-stressed regions: a case study of the distribution network in Mpumalanga · 2026 · DOI

  • The long-term use of reclaimed water may substantially alter soil physical and chemical properties. There is a need to evaluate the spatial variability of water and soil physicochemical properties in arid regions irrigated with treated wastewater. The effects of irrigation duration on soil properties are not well understood.

    Spatial Variability of Soil Characterization in Arid Regions Irrigated with Treated Wastewater: Comparative Assessment of Long-Term Impacts on Two Commercial Farms · 2026 · DOI

  • Routine logs and scheduled laboratory testing for turbidity and microbiological indicators are required to verify long-term water safety. Staged monitoring improvements as the system continues operating.

    Ultrafiltration-based drinking water service for SDG 6 in Pulau Kemarau · 2026 · DOI

  • The lack of access to safe drinking water in river-dependent communities. The need for decentralized drinking-water service points that can operate at low cost.

    Ultrafiltration-based drinking water service for SDG 6 in Pulau Kemarau · 2026 · DOI

  • There is a need for standardization of methods in WBE. There is a lack of understanding of the stability of analytes in sewer systems.

    Wastewater‑Based Epidemiology in the Monitoring of Community Health and Environmental Exposure · 2026 · DOI

  • There is a lack of data on bromide concentrations in Estonian WWTP effluents. The use of ozonation for micropollutant removal requires further research.

    Bromides in treated wastewater: limiting the choice of quaternary wastewater treatment technologies for residual micropollutant removal. An Estonian case study · 2026 · DOI

  • The gap is in understanding the socio-ecological and economic benefits of managed reuse in an arid agricultural system. The effects of salinity on different rootstocks are not well understood.

    Reframing Reclaimed Wastewater as a Resource: Socio-Ecological and Economic Benefits of Managed Reuse in an Arid Agricultural System · 2026 · DOI

  • The specificity of the formation of filtration waters can differ significantly. There is a need to develop a controlled mechanism for the formation of soil layers for more complex nature-like systems.

    The mechanism of wastewater formation from artificial green areas in urbanized territories · 2026 · DOI

  • The lack of access to safe drinking water in many areas, particularly in rural Indonesia, where bore wells or groundwater are vulnerable to contamination by heavy metals. The need for low-cost, locally available filtration media for clean water treatment.

    Comparative Effectiveness of Coconut Shell Charcoal and Rice Husk Ash as Adsorbents in Filtration Systems for Iron (Fe) and Manganese (Mn) Removal from Groundwater · 2026 · DOI

  • Future investigations should address these parameters to better understand the relationship between material structure and treatment performance. A limitation of the present study is the absence of a parallel control filter filled with a conventional filtration medium. Therefore, the nitrogen transformation pathways occurring within the filters could not be fully assessed and should be investigated in future studies.

    Circular Economy Approach to Wastewater Treatment: Reuse of Synthetic Wool Waste as a Filtration Material for Domestic Wastewater Treatment · 2026 · DOI

  • Future research should incorporate primary data collection, including operator interviews and longitudinal water quality monitoring. The study suggests that future research should focus on quantifying economic costs of failure and health outcomes.

    Exploring the complexities and factors contributing to Lebowakgomo Wastewater Treatment Plant failure · 2026 · DOI

  • The research highlights the need for integrated, systems-level interventions for sustainable rehabilitation.

    Exploring the complexities and factors contributing to Lebowakgomo Wastewater Treatment Plant failure · 2026 · DOI

  • Development of strategies to address the challenges identified in the study.

    INFRASTRUCTURE PERFORMANCE ANALYSIS OF THE ON-SITE DOMESTIC WASTEWATER MANAGEMENT SYSTEM IN BANDA ACEH · 2026 · DOI

  • Wastewater and environmental surveillance may be subject to stigma and discrimination. The approach may be politicized, leading to unintended consequences. There may be challenges in implementing the approach in low-and middle-income countries with limited resources.

    Possibilities and Limitations for Conducting Wastewater and Environmental Surveillance in Refugee Camps Worldwide. · 2026 · DOI

  • The sample size was limited to 10 raw greywater samples with three replications each.

    Greywater Quality Assessment and Reuse Potential in Mymensingh: Towards Sustainable Urban Water Use · 2026 · DOI

  • First, modeling and analytics—from coupled C–N–P accounting frameworks to machine-learning-assisted leak localization—can convert complex environmental and operational data into actionable guidance for system optimization.

    Science and Technology for Water Purification (2nd Edition) · 2026 · DOI

  • Limited public awareness regarding safe sanitation practices. Limited integration between government and private sludge transportation.

    INFRASTRUCTURE PERFORMANCE ANALYSIS OF THE ON-SITE DOMESTIC WASTEWATER MANAGEMENT SYSTEM IN BANDA ACEH · 2026 · DOI

  • Investigation of other graywater treatment technologies, - Analysis of the life-cycle cost of the treatment systems, - Study of the impact of climate change on water scarcity in urban…

    Comparative Evaluation of Graywater Treatment Technologies for Hammam Water Reuse in Urban Areas · 2026 · DOI

  • Investigate the effects of treated wastewater irrigation on soil microbial communities, - Assess the impact of different irrigation management practices on soil salinization and sodicity, - Evaluate the potential for using alternative water sources, such as desalinated water…

    Spatial Variability of Soil Characterization in Arid Regions Irrigated with Treated Wastewater: Comparative Assessment of Long-Term Impacts on Two Commercial Farms · 2026 · DOI

  • The analysis is based on simulation data only - Limited to the operational conditions of Plant F - Only 30 representative technologies…

    Comprehensive Sustainability Evaluation of Low-Carbon Technology in Wastewater Treatment System Based on Carbon Reduction–Economy–Technology Coupling Index · 2026 · DOI

  • Further research on real-world application scenarios - Expansion of the inventory with more diverse technologies - Long-term impact assessment over multiple…

    Comprehensive Sustainability Evaluation of Low-Carbon Technology in Wastewater Treatment System Based on Carbon Reduction–Economy–Technology Coupling Index · 2026 · DOI

Most-cited papers in Wastewater Treatment and Reuse

Most recent work

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Open questions raised by papers listed on this page include: (1) Further studies should investigate the effectiveness of different treatment methods for greywater recycling (“Greywater Quality Assessment and Reuse Potential in Mymensingh: Towards…”, 2026); (2) The lack of investments in wastewater infrastructure, adoption of innovative sanitation systems, environmental education, and robust policy frameworks limits the implementation of sustainable wastewater treatment technologies (“Water and Wastewater Treatment Technologies: Sustainable Approaches for Clean…”, 2026); (3) There is a need to evaluate the spatial variability of water and soil physicochemical properties in arid regions irrigated with treated wastewater (“Spatial Variability of Soil Characterization in Arid Regions Irrigated with…”, 2026); (4) The lack of access to safe drinking water in river-dependent communities (“Ultrafiltration-based drinking water service for SDG 6 in Pulau Kemarau”, 2026); (5) There is a lack of understanding of the stability of analytes in sewer systems (“Wastewater‑Based Epidemiology in the Monitoring of Community Health and…”, 2026). 132 gap statements have been mined from Wastewater Treatment and Reuse papers in our 4.5M-paper local library, which holds 875 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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