Optimization of aquifer recharge using treated wastewater in a mixed-crop farming region Design and evaluation of solar-assisted, low-cost dehydration of fruits for smallholder farmers Development of an automated moisture and temperature control system for grain storage silos Assessment of biochar-based soil amendments on nutrient use efficiency in tropical soils Techno-economic analysis of on-farm biogas plants integrated with poultry litter management Waste-to-resource: valorization of agro-industrial by-products into sustainable feed for ruminants Modeling and experimental validation of mechanical field harvesters for root crops in smallholder farms Fermentation and bioconversion of agricultural residues into lactic acid for bioplastic precursors Optimization of drip irrigation scheduling using remote sensing and soil-water-plant sensor data Design and performance evaluation of a portable solar dryer for leafy vegetables in rural communities

Project Abstract

This study investigates the optimization of aquifer recharge using treated wastewater in a mixed-crop farming region, integrating hydrogeological modeling, water quality treatment, and on-farm implementation to enhance groundwater sustainability and crop productivity. The research adopts a multidisciplinary approach combining hydrology, environmental engineering, and agronomy to quantify recharge fluxes, contaminant attenuation, and seasonal impacts on soil moisture and crop yields. A site-specific hydrogeological model was developed using MODFLOW to simulate aquifer response under varying injection rates, withdrawal patterns, and climatic scenarios. Treated wastewater undergoes a treatment train including primary screening, secondary biological treatment, and disinfection to meet reuse standards while preserving nutrient content essential for soil fertility. A pilot recharge facility was designed with adjustable infiltration basins, recharge wells, and monitoring wells to evaluate hydraulic performance, clogging potential, and energy requirements. Water quality indicators—including pathogen indicators, organic contaminants, salinity, and nutrient loads—are monitored to assess the risk of aquifer contamination and to optimize blending and dilution strategies. In parallel, agronomic trials in adjacent plots examine the effects of recycled water on soil properties (electrical conductivity, pH, organic matter) and crop performance for cereals, legumes, and vegetables under a rainfed-microirrigation regime. A coupled optimization framework employing multi-objective optimization and scenario analysis identifies recharge strategies that maximize groundwater recharge while safeguarding aquifer storage, meeting regulatory constraints, and maintaining or increasing crop yields. Economic and environmental life-cycle assessments evaluate capital and operating costs, energy consumption, greenhouse gas emissions, and long-term sustainability under different policy and climate scenarios. The study further investigates governance and institutional arrangements for treated wastewater reuse, risk communication, and community acceptance to ensure social feasibility. Sensitivity analyses quantify the influence of key parameters such as injection hydrograph, evapotranspiration, aquifer thickness, and seasonal demand on recharge efficiency and resource reliability. Results indicate that optimized recharge with appropriately treated wastewater can achieve measurable increases in aquifer storage, reduce pumping costs, and improve soil moisture regimes during dry spells, with negligible impact on water quality when proper monitoring and blending are maintained. The research demonstrates a scalable decision-support tool that integrates hydrochemical data, aquifer characteristics, and crop water requirements to guide practitioners in selecting recharge configurations, operation schedules, and risk mitigation measures. Recommendations include best-practice guidelines for treatment levels, infiltration design, and hydrological monitoring, as well as policy pathways to promote sustainable reuse frameworks in mixed-crop farming landscapes. Overall, the project contributes to water security by leveraging wastewater as a valuable resource for aquifer replenishment while protecting public health and environmental integrity.

Project Overview

What This Project Is About

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A practical study on how we can recharge groundwater more effectively by using treated wastewater from nearby communities, within a farming area that grows a mix of crops. The project looks at how this water can be safely returned to the ground to help crops grow better, while protecting the environment.

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The Problem It Addresses

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Many farms rely on limited fresh water, and groundwater levels are dropping in some regions. Treating wastewater makes more water available, but using it for recharge raises concerns about safety, soil health, and long-term groundwater quality. This project investigates how to balance water supply, crop needs, and safety.

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Objectives of the Project

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1. Assess current water availability and irrigation needs in a mixed-crop farming area.
2. Evaluate treatment quality and suitability of treated wastewater for groundwater recharge.
3. Propose a practical recharge strategy that protects soil and groundwater.
4. Develop simple guidelines for monitoring water quality and soil health during reuse.

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What You Will Do Step by Step

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1) Review local water use and crop requirements. 2) Collect data on water quality from treated wastewater and soil conditions. 3) Model how recharge might affect groundwater levels. 4) Design a basic pilot recharge plan and safety checks. 5) Analyze results, compare with traditional irrigation, and adjust recommendations. 6) Create simple monitoring forms and guidelines for farmers.

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Expected Outcome

Clear, easy-to-follow recommendations for safe aquifer recharge with treated wastewater, including monitoring steps and potential benefits for crop yields and water security.