Where Does the Feces from Mobile Toilets Go?

The feces from mobile toilets are usually regularly suctioned and transported to specialized treatment centers for harmless treatment, or resource utilization is achieved through different technologies, with the specific destination depending on the type of toilet.

1. Regular Suction and Centralized Treatment
   Mobile toilets typically have a sewage tank at the bottom. When feces and sewage accumulate to a certain amount, professional personnel use suction trucks to suction and transport them to feces treatment centers. Treatment methods include biological degradation (using microorganisms to decompose organic matter), chemical treatment (disinfection and sterilization), or physical treatment (filtration and separation), ultimately transforming them into harmless substances. Some of the treated products can be further processed into organic fertilizers for use in agriculture or greening, achieving resource recycling.

2. Flush and Non-flush Suction Types
   Flush-type mobile toilets use water from a tank to flush feces into the sewage tank and require regular suctioning, suitable for places with water supply conditions (such as scenic spots and construction sites); non-flush suction types directly receive excreta in the sewage tank and are suitable for temporary or water-scarce areas (such as disaster areas and outdoor activities). Both rely on subsequent suction and transportation to ensure hygiene and safety.

3. Recirculating Flush Type
   This type of toilet uses biofilm technology to treat fecal sewage through aerobic and anaerobic reactions and adds microbial strains to accelerate decomposition. The treated water can be recirculated for flushing, significantly reducing water consumption and lowering the frequency of suctioning, suitable for high-traffic areas (such as stations and exhibitions).

4. Dry Packing Type
   Biodegradable plastic bags are used to receive excreta, and a new bag is automatically replaced after each use, which is then transported to a treatment plant in a concentrated manner. This method does not require water flushing and is suitable for areas lacking water or drainage networks (such as remote mountainous areas), but regular cleaning of the plastic bags is required to avoid pollution.

5. Microbial Degradation Type
   After solid-liquid separation, solid feces are mixed with sawdust and microbial strains for fermentation, decomposing into carbon dioxide and water (degradation rate ≥ 99%); urine is treated into reclaimed water through aeration and evaporation. There is no pollution emission throughout the process, and organic fertilizer can be generated, suitable for places with high environmental protection requirements (such as ecological parks).

6. Other Treatment Methods

   • Vacuum Suction Type: Uses a vacuum pump to suck excreta into a collection tank, saving water and facilitating transportation, commonly seen in vehicle-mounted mobile toilets.
   • Natural Treatment: Bacteria or earthworms in the fecal pit decompose the waste, but management is difficult, and it is prone to generating odors and pathogens.
   • Septic Tank Treatment: Uses sedimentation and anaerobic fermentation technology to purify sewage, but it may pollute groundwater and should be used with caution.