Advanced Technology in Ancient Tikal
Over 2,000 years ago, the Maya civilization constructed a sophisticated water filtration system in the city of Tikal, utilizing materials sourced from miles away. Recent excavations in northern Guatemala have unearthed remnants of this ancient engineering feat, as reported by Michelle Starr for Science Alert.
An Early Example of Modern Filtration
Published in the journal Scientific Reports, the research indicates that the Corriental reservoir filtration system was established as early as 2,185 years ago, shortly after Tikal's founding around 300 B.C. The system employed crystalline quartz and zeolite, minerals that formed a "molecular sieve" capable of filtering out harmful microbes, heavy metals, and other pollutants. Remarkably, these same minerals are still used in contemporary water filtration.
Lead author Kenneth Barnett Tankersley, an archaeologist at the University of Cincinnati, highlights the significance of this discovery, noting that the Maya developed this effective filtration method over two millennia ago. Previously, the use of zeolite for water filtration was believed to have originated in the early 20th century.
Advanced Engineering in the Maya Civilization
The Maya's water management techniques demonstrate a level of technological sophistication comparable to, and in some cases surpassing, other ancient civilizations. While ancient Egypt, Greece, and South Asia utilized simpler filtration methods as early as the 15th century B.C., the Maya's use of quartz and zeolite placed them millennia ahead in water purification technology.
Addressing Water Quality in Tikal
Tikal's location on porous limestone presented significant water scarcity challenges during seasonal droughts. The filtration system was crucial for ensuring safe drinking water, as the Corriental reservoir would have otherwise contained cyanobacteria and other toxins harmful to human health.
Previous research by the team identified mercury contamination in other Tikal reservoirs, likely from pigments used in ceremonial contexts. However, the Corriental reservoir remained free from such pollution, providing cleaner water for the city's inhabitants.
Hypothetical scheme of the ancient water purification system at Tikal. Macro-crystalline quartz crystal sand and zeolite filtration system positioned just upstream of, or within the reservoir ingress. Kenneth Barnett Tankersley used Microsoft PowerPoint for Mac Version 16.41 (www.microsoft.com) to create this figure.
Clever Resource Utilization
The study suggests that the Maya sourced quartz and zeolite from the Bajo de Azúcar area, about 18 miles northeast of Tikal, where these materials naturally purified water. Co-author Nicholas P. Dunning posits that the Maya likely observed the association between these materials and clean water, leading to their intentional transportation and use in Tikal's filtration system. The system's design included settling tanks to further purify water before it entered the reservoir, resulting in cleaner, better-tasting water.
Rediscovery of Tikal
Known as Yax Mutal to its ancient residents, Tikal housed over 3,000 structures and a population of at least 60,000 at its peak around 750 A.D. Following its abandonment 900 years ago, much of the city was hidden until Guatemalan archaeologists uncovered significant portions, including the Lost World complex of pyramids and buildings, in the late 20th century.
Tikal site map. (A) Location of Tikal in the southern Maya lowland. (B) The location of the Corriental, Palace, Perdido, Temple, and Tikal reservoirs, and the Inscription sinkhole and their catchment areas. (C) A lidar-derived hillshade image of the Corriental reservoir. The lidar-derived hillshade images (B,C) were created by Francisco Estrada-Belli, a principle of the PACUNAM Lidar initiative23. Christopher Carr used ESRI ArcGIS 10.3.1 software (www.esri.com) to create a GIS layer of the catchment areas, georeferenced on the hillshades to make the base maps. Kenneth Barnett Tankersley then used Microsoft PowerPoint for Mac Version 16.41 (www.microsoft.com) to create this figure.
Extensive written records provide a detailed history of Tikal's rulers over an 800-year span. In 1979, UNESCO designated Tikal National Park as a World Heritage site, recognizing its well-preserved structures and artistic achievements as evidence of Maya cultural and scientific development.
The newly discovered water filtration system enhances our understanding of Maya scientific advancements. Future research by Tankersley and his team aims to identify other Maya sites that may have employed similar water purification technologies.
