How Do Mobile Toilets Handle Defecation?
The defecation methods of mobile toilets vary depending on their design and treatment types. Common methods are as follows:
Water-flushing direct-discharge type This type uses a water-flushing device to directly flush excrement into the sewer pipe, requiring supporting sewage pipes and septic tanks. Its principle is similar to that of a fixed toilet, relying on continuous water flow to transfer excrement. However, it is necessary to ensure that the sewage pipes are connected to the municipal system or septic tank to avoid blockage or overflow. It is suitable for scenarios with complete sewage infrastructure, such as temporary urban event venues.
Waterless flushing and packaging type Special biodegradable packaging bags are used to collect excrement. After use, staff seal and package the bags and transport them to designated disposal points (such as waste treatment plants or composting sites). This type of toilet does not require a water source or sewage system but requires regular replacement of packaging bags. It is suitable for areas lacking water or sewage facilities, such as野外 construction (field construction) sites and disaster relief sites.
Foam sealing type A foaming device generates foam to cover the surface of excrement, forming a sealed layer to isolate odors and prevent direct contact between excrement and the ground. The active ingredients in the foam can decompose some organic matter. When the fecal storage tank is full, it is pumped out by a fecal suction truck for treatment. This method saves water and has good odor control, often used in public places such as scenic spots and stations.
Microbial degradation type A solid-liquid separation device is used to separate urine and feces for separate treatment: urine is filtered and then directly discharged or recycled; feces are decomposed into carbon dioxide, water, and a small amount of organic residue by microbial flora, with a degradation rate of over 99%. This type of toilet is highly environmentally friendly and does not require frequent removal but requires regular addition of microbial strains and maintenance of equipment temperature and humidity conditions.
Recirculating water-flushing type Equipped with intermittent aerobic and anaerobic treatment devices, this type accelerates the fermentation and decomposition of excrement through microbial strains. The treated water is disinfected and then recirculated for flushing the toilet. This method significantly reduces water consumption but requires regular monitoring of water quality and supplementation of microbial strains. It is suitable for scenarios with water scarcity or long-term use, such as public facilities in remote areas.
Vacuum suction pump or sealed fecal suction truck A vacuum pump generates negative pressure to suck excrement into a sealed fecal storage tank, or a fecal suction truck is directly connected to the toilet's sewage outlet for pumping. The transportation process is fully sealed to avoid odor diffusion and secondary pollution, and the excrement is finally discharged into a sewage treatment plant for centralized treatment. This method is efficient and environmentally friendly but relies on professional vehicles and operators.
Traditional drainage ditch In remote or rudimentary areas, a simple drainage ditch may be used to directly discharge fecal water. Regular cleaning of sediment in the ditch is required to prevent blockage and environmental pollution. This method has low cost but poor sanitary conditions and is only used as a temporary or emergency solution.
