Wetlands: Only a solution for farmers and developing countries? – Not at all.

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An article recently published presents constructed wetlands in a generally positive light, but contains some shortened or potentially misleading statements.
It is correct that planted soil filters require space. However, it is misleading to imply that they can only treat “limited” volumes of water – every wastewater treatment plant is hydraulically designed for a defined capacity.
Properly designed systems do not produce odors. Fluctuating inflows are a challenge for all biological treatment processes – constructed wetlands are considered robust in this respect.
Constructed wetlands are not a development solution, but a standards-compliant, professional wastewater technology – successfully implemented for over 30 years.

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Are “electroactive constructed wetlands” the future?

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A current research project is investigating the potential of electroactive constructed wetlands as an advancement of conventional planted soil filters.
Based on a one-year pilot system operated under real wastewater conditions, a significantly higher removal performance for organic matter and nutrients was demonstrated.
Through the targeted use of conductive elements, material consumption and land requirements were substantially reduced.
The results show that electroactive constructed wetlands are technically robust and economically viable for practical application.

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A Proven Concept: New Large-Scale Nature-Based WWTP Project in Mexico for 14,000 People

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In Acolman (State of Mexico), a new nature-based wastewater treatment plant is under construction for the Los Héroes Acolman residential development. The system follows the proven model used in our projects in Rayón, Mexicali and Cihuatlán: robust primary treatment, natural sludge humification, and a vertical-flow constructed wetland, followed by a naturally designed polishing pond providing substantial ecological added value.

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Janisch & Schulz at Aquatech Mexico 2025

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At Aquatech Mexico 2025, held September 2–4 at Centro Banamex, Mexico City, J&S Engineers will present innovative water reuse solutions. Our Constructed Wetlands (CW) offer eco-friendly wastewater treatment, enabling irrigation for greenery, parks, and buildings while reducing pollutant discharge into rivers. These systems lower freshwater use, energy costs, and wastewater fees, promoting sustainability. Projects like Cihuatlán and Mexicali demonstrate high purification with minimal energy, supporting local ecosystems. Our work enhances quality of life for communities, flora, and fauna, making CWs a cornerstone of sustainable urban water management.

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