Previous Mobile Toilets
Previous mobile toilets have undergone multiple developmental stages, evolving from ancient portable sanitary appliances to modern functional facilities.
Ancient Stage: During the Han Dynasty, portable sanitary appliances similar to mobile toilets had already emerged. For instance, the lacquered wooden box unearthed from the Eastern Zhou tomb in Lizhouyou, Jing'an, Jiangxi, with its lower-layer covered square box, is considered a prototype of ancient 'mobile toilets'. The bronze 'huzi' (tiger-shaped urinal) used by Han Dynasty nobility as a portable night pot was made of non-leaking bronze and designed for easy gripping, meeting portability needs. The Han Dynasty imperial palace was equipped with stone toilets featuring armrests, connected to ceramic sewage pipes and accompanied by 'toilet sieves', forming a simple sewage system. The movable ceramic toilet ring unearthed from the Yangfutou Han tomb in Sichuan, complete with a roof on top and a fecal pit at the bottom, provided both shelter and sanitation. The mobile toilet house with an axle discovered in an Inner Mongolian Han tomb, resembling a modern RV bathroom, achieved mobility through its axle, demonstrating early integrated design of mobile toilets.
Modern and Contemporary Stage: In the 20th century, to address the issue of wasted man-hours due to workers traveling back and forth to fixed toilets at construction sites, the first batch of mobile toilets assembled from wooden planks and iron sheets emerged. These early mobile toilets, primarily constructed from traditional materials like wood, were simple in structure but had limited functionality, easily absorbing odors and offering poor sanitary conditions. With advancements in material science, mobile toilets gradually adopted new materials such as fiberglass-reinforced plastic and polyethylene, enhancing durability and odor resistance.
Classification and Functional Upgrades: Modern mobile toilets are classified by structural form into single-unit structures (independent units) and composite structures (multi-unit combinations); by mobility into hoisting and handling types (requiring mechanical assistance for movement) and powered towing types (equipped with their own power or towable); and by sewage treatment methods into water-flush types (relying on water for flushing), waterless vacuum suction types (using vacuum suction for fecal treatment), recirculating water-flush types (utilizing water recycling), and dry-pack types (packaging feces for centralized treatment). These classifications reflect the technological evolution of mobile toilets in adapting to different scenario requirements. For example, waterless and dry-pack types are suitable for water-scarce regions, while powered towing types enhance mobility flexibility.
