Principle of Mobile Toilets
The principles of mobile toilets vary depending on their types. Here are explanations of the principles for several common types:
Elevating Mobile Toilets: Taking the elevating public toilets in the Netherlands as an example, their operating principle mimics the structure of an elevator shaft. The toilet body is made of a stainless-steel box, with an integrated hydraulic system inside. During the day, the box is completely hidden underground, flush with the ground surface. At night (e.g., 11 p.m.), the box is lifted to the ground surface by a hydraulic device for use and automatically sinks back underground in the early morning (e.g., 4 a.m.). After the manhole cover closes, it seamlessly connects with the surrounding ground. This design not only saves space but also avoids affecting the urban landscape during the day. Meanwhile, precise control by the hydraulic system ensures a smooth and safe lifting process.
Traditional Sewage-Storage Mobile Toilets: These are equipped with a detachable sewage storage tank inside, into which waste directly falls. To reduce odors and bacterial growth, degradation agents or deodorants may be pre-placed in the tank to decompose organic matter through chemical or biological actions. The ventilation system is achieved in two ways: first, by utilizing natural airflow through ventilation openings at the top of the box to form air convection; second, by installing small fans for forced ventilation to accelerate odor removal. When the sewage storage tank is full, it can be entirely replaced by a special vehicle, making it suitable for scenarios without a sewer connection.
Water-Saving or Waterless Mobile Toilets: These reduce or eliminate the need for flushing through special designs. Water-saving toilets may adopt micro-flushing technologies such as foam sealing or vacuum suction, using a small amount of water (usually less than 0.5 liters per flush) for cleaning. Waterless toilets rely on chemical agents or biological decomposition to treat waste. For example, chemical agents decompose excreta through oxidation or neutralization reactions, while biological decomposition uses microorganisms to convert organic matter into harmless substances. These toilets are often equipped with sealed structures to prevent odor leakage and are suitable for water-scarce areas or temporary event venues.
Solar-Powered Mobile Toilets: Solar panels are installed on the roof of the toilet to convert light energy into electrical energy for powering internal equipment. The main application scenarios include driving ventilation systems (e.g., exhaust fans) or lighting equipment (e.g., LED lights). Some models can also power small sewage treatment devices or sensors. The solar system is usually equipped with a storage battery to ensure basic functionality remains available on cloudy days or at night, reflecting an environmentally friendly and sustainable design concept.
