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.
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.
The BW Green Building in Bietigheim-Bissingen redefines sustainable architecture with an innovative Constructed Wetland (CW) by J&S Engineers. The CW naturally treats greywater, and the purified water, combined with harvested rainwater from cisterns, is used to irrigate roof and facade greenery. This approach minimizes wastewater, utilizes excess nutrients for plant fertilization, and cools the building through evaporation, enhancing the urban microclimate. Designed as an attractive green terrace, the CW demonstrates how biological water treatment can be efficiently and visibly integrated into modern architecture.
As a sponsor of the 2025 Pan-American Conference in Paraguay, J&S Engineers promoted knowledge exchange on Constructed Wetlands (CW). Jörg Janisch highlighted their cost-effective, low-maintenance benefits for developing countries. The event featured lectures, workshops, and excursions to advance sustainable water technologies.
We continue our work in the field of nature-based wastewater treatment in Mexico. Our third large-scale project is currently being implemented in Rayón, involving the rehabilitation and expansion of an existing wastewater treatment plant.
Janisch & Schulz Mexico has completed a new constructed wetland near Ciudad Guadalupe Victoria. The project expands an existing lagoon-based treatment plant with two additional purification stages: eight vertical-flow planted filters (12,800 m²) and a series of polishing ponds (14,000 m²). This combination significantly enhances treatment efficiency and supports the ecological restoration of the area.rdert die ökologische Aufwertung des Gebiets.
Janisch & Schulz is participating in the DWA Climate Award with a constructed wetland at the “Little Franklin” nature kindergarten in Mannheim. The system naturally treats wastewater on-site, avoiding discharge into the public sewer. The purified water infiltrates locally, creating wetland habitats that enhance biodiversity and serve as green, cooling areas. This project demonstrates how nature-based wastewater treatment can support climate adaptation in urban environments. The award winners will be announced at the DWA “Water Days” in Berlin in September.
At J&S Engineers, we know how to purify wastewater and we have successfully been doing that for more than 30 years now. Starting off with small and medium-scale solutions, today we lead international projects for large-scale systems, treating wastewater for up to 25.000 people. Our design know-how includes complete multi-stage treatment plants, applying nature-based solutions as the core technology.
J&S Engineers lead the construction of another project, benefiting more than 20.000 people in Rayón.
Since the German Janisch & Schulz Engineering Company was awarded the contract for building several Constructed Wetland projects in Mexico in 2018, significant progress has beed made.
In Paraguay’s legislative landscape, our engineers at Janisch & Schulz proudly contributed to a UN-funded infrastructure project, focusing on wastewater treatment solutions that seamlessly blend with intelligent architecture.
