Operation Principle of Mobile Toilets
The operation principle of mobile toilets varies depending on their types, mainly including storage-type, recirculating water-flushing type, dry or composting type, and lifting type, among others.
Storage-type mobile toilets are equipped with a large fecal storage tank, which is their core structure. After people use the toilet, the waste enters the storage tank. To treat this waste and reduce odors, chemical or biological methods are employed for decomposition and deodorization. Chemical methods may involve adding specific chemical agents to decompose organic matter, kill bacteria, and eliminate odors through chemical reactions. Biological methods utilize the metabolic activities of microorganisms to decompose waste into relatively stable substances. This type of mobile toilet has a relatively simple structure, but regular waste removal from the storage tank and replacement of the treatment solution are required during maintenance to ensure normal operation and hygiene.
Recirculating water-flushing mobile toilets are equipped with a small water tank, offering significant water-saving advantages. During the flushing process, the used water is not directly discharged but filtered through a filtration system. The filtered water can be reused several times for subsequent flushing operations. Compared to storage-type mobile toilets, recirculating water-flushing types greatly reduce water consumption. However, due to the addition of filtration and other components, their structure is slightly more complex than that of storage-type toilets, requiring regular maintenance and cleaning of the filtration system to ensure proper operation and water quality compliance.
Dry or composting mobile toilets emphasize environmental friendliness. They promote the natural decomposition of waste by adding auxiliary materials such as sawdust and straw. These materials can adjust the humidity, aeration, and other conditions of the waste, providing a suitable environment for the growth and reproduction of microorganisms, thereby accelerating the decomposition process. However, this type of mobile toilet requires specific management and treatment procedures, such as controlling the amount and timing of auxiliary material addition and regularly stirring the mixture of waste and auxiliary materials to ensure decomposition effectiveness and hygiene safety.
The lifting type is a relatively special type of mobile toilet, exemplified by the lifting public toilets in the Netherlands. Its operation principle mimics that of an elevator shaft, relying on a hydraulic system to control the lifting and lowering of the toilet box. During the day, the box is completely hidden underground, not affecting normal ground use and aesthetics. At 11:00 PM, it pops up for use, and at 4:00 AM, it automatically descends back underground, with the manhole cover fitting tightly to ensure ground flatness and safety.
