Defecation in Mobile Toilets

After defecating in a mobile toilet, the method of feces disposal depends on the specific type of mobile toilet. Common disposal methods are as follows:

1. Water-flush and Non-water-flush Suction Types
   The water-flush type uses a water tank to flush feces into a bottom sewage tank, while the non-water suction type directly receives excreta in a sewage tank. Both methods require regular use of a fecal suction truck to empty the contents of the sewage tank, suitable for areas with water supply or temporary, water-scarce scenarios.

2. Recirculating Water-flush Type
   This type employs biofilm technology, using aerobic and anaerobic microorganisms to treat fecal sewage. Specific bacterial strains are added during the treatment process to accelerate decomposition. The treated water can be recycled for toilet flushing, significantly reducing water consumption and the frequency of suction.

3. Dry Packaging Type
   Biodegradable plastic bags are used to receive excreta, with a new bag automatically replaced after each use. The packaged feces are then transported to a professional treatment plant, suitable for areas lacking water or drainage networks, avoiding secondary pollution.

4. Foam Sealing Type
   Foaming liquid generates foam to cover the toilet surface, blocking odors and lubricating for flushing. This technology consumes very little water, suitable for high-traffic areas or epidemic prevention sites, but requires regular replenishment of foaming liquid.

5. Microbial Degradation Type
   After solid-liquid separation of feces, the solid portion is mixed with wood chips and bacterial strains for fermentation, decomposing into carbon dioxide and water (degradation rate ≥ 99%); urine is treated through aeration and evaporation to be converted into reclaimed water for reuse. The entire process has no pollution emissions, and the final product can be made into organic fertilizer.

6. Vacuum Suction Type (Vehicle-mounted Mobile Toilets)
   A vacuum pump is used to suck excreta into a fecal collection tank, reducing water consumption and facilitating transportation and treatment. Commonly found in mobile scenarios such as trains and airplanes, the fecal collection tank needs to be emptied regularly.

7. Direct Discharge + Septic Tank Type
   A sealed septic tank (with a capacity of about 200 liters) is installed at the bottom of the mobile toilet. When it is nearly full, a fecal suction truck is used to remove it and transport it to a treatment station. The fecal water is disinfected and filtered before discharge, and the fecal residue is pressed into dry cakes for composting.

8. Self-contained Packaging Bag Type
   A plastic bucket lined with a thick plastic bag is installed inside the toilet, with a drawstring used to seal the excreta. Although the cost is higher, the disposal process is cleaner, suitable for scenarios with high hygiene requirements.

9. Direct Discharge
   Some mobile toilets discharge feces directly into the municipal sewage network through pipes, which must comply with environmental protection and hygiene standards to avoid polluting public water sources.

10. Manual Cleaning
    A fecal storage tank or pre-buried septic tank is set up, requiring regular manual cleaning and centralized treatment. Protective equipment must be worn during operation to ensure hygiene and safety.

11. Mechanical Treatment
    Specialized equipment is used for solid-liquid separation, decomposition, and disinfection, reducing the impact on the environment. Commonly found in large-scale events or long-term use of mobile toilets, ensuring hygiene and safety.