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:

1. Discharge via Vacuum Sewage Pumps or Sealed Sewage Trucks
   Some mobile toilets use vacuum sewage pumps or sewage pumps installed beneath the main body to suck in and process excrement through pipes. If the toilet is not equipped with a built-in treatment system, a sealed sewage truck is required to regularly collect the feces and transport it to a sewage treatment plant for centralized processing. This method is suitable for scenarios without fixed sewage pipes and relies on external equipment for cleaning.

2. Flush and Non-flush Suction Types

   • Flush Type: A water tank is installed at the top of the toilet, and a sewage tank is equipped at the bottom. After use, the flushing device flushes the excrement into the sewage tank. When the sewage tank reaches its capacity limit (usually calculated based on the number of uses), it needs to be cleaned using a suction device.
   • Non-flush Type: Without a flushing device, excrement is directly received by the sewage tank at the bottom, which also requires regular suction. Both methods rely on the capacity of the sewage tank to limit usage frequency and are suitable for short-term or low-frequency use scenarios.

3. Recirculating Flush Type
   This type of toilet is equipped with intermittent aerobic and anaerobic treatment devices. By adding biological bacteria and using biofilm technology, it accelerates the fermentation and decomposition of fecal sewage. The treated water is purified through a filtration device and then recirculated for flushing the toilet, forming a closed-loop system. This method reduces water consumption but requires regular maintenance of the bacteria and filtration equipment.

4. Dry Packing Type
   Biodegradable plastic bags are placed beneath the toilet fixtures, and a new bag is automatically replaced after each use. The excrement is sealed and received by the plastic bag, which is then collected and transported to a treatment plant after use. This method does not require water flushing or a sewage tank and is suitable for water-scarce or environmentally demanding scenarios, but the plastic bags need to be replaced regularly.

5. Foam Sealing Type
   Foam generated by a foaming liquid mixture covers the inside of the toilet bowl, replacing traditional flushing. Compressed air is delivered through pipes to a foam activator, causing the foam to cover the excrement through channels and preventing odor diffusion. When the feces accumulate to a certain amount, they are removed by a sewage truck for treatment. This method saves water and has good deodorization effects but requires regular replenishment of the foaming liquid.

6. Microbial Type
   Excrement enters a solid-liquid separation device through an automatically opening toilet bowl, with urine and feces treated separately:

   • Feces: Enter a fermentation tank and are decomposed into CO₂ and H₂O by microbial bacteria, with a degradation rate exceeding 99%.
   • Urine: After filtration, it enters a comprehensive treatment system and is converted into reclaimed water through processes such as aeration, evaporation, and decolorization, which is then used to flush the urinal. This method is environmentally friendly and efficient but requires maintenance of the microbial flora and treatment equipment.

7. Direct Flush Type
   Excrement is directly flushed into the sewer pipe through a flushing device, requiring配套 (should be 'accompanied by') sewage pipes and a septic tank. This method relies on the municipal sewage system and is suitable for fixed locations or long-term use scenarios, but the installation cost is relatively high.

8. Non-flush Packing Type
   Special packing bags are used to receive excrement, which are packed by staff after each use and transported to a designated location for treatment. This method does not require water flushing or a sewage tank and is simple to operate, but it requires manual intervention and regular cleaning of the packing bags.