How to Treat Sewage from Mobile Toilets

The treatment methods for sewage from mobile toilets vary depending on the type of toilet, and the appropriate method should be selected based on the specific type.

1. Flush and Non-flush Suction Type
   Flush toilets use a top water tank to flush, and the sewage is discharged into a bottom sewage tank; non-flush toilets directly receive waste in the bottom sewage tank. Due to the small capacity of the sewage tank, regular suction (usually based on the number of users or a fixed frequency) is required, and the sewage is transported by specialized vehicles to a sewage treatment plant or designated location for centralized treatment. This method is suitable for temporary events or locations without fixed sewage pipes, but requires frequent maintenance.

2. Recirculating Flush Type
   Equipped with intermittent aerobic and anaerobic treatment units, biological strains are added, and biofilm technology is used to accelerate the fermentation and decomposition of fecal sewage. The treated water is recirculated through a filtration unit to flush toilet fixtures, forming a closed-loop system. This technology can significantly reduce water consumption and is suitable for water-scarce areas or scenarios with high environmental protection requirements, but requires regular replenishment of biological strains and maintenance of equipment stability.

3. Dry Packaging Type
   Without a flushing device, waste is received in biodegradable plastic bags at the bottom of the fixtures. A new plastic bag is automatically replaced after each use, and after use, they are collected and transported to a treatment plant for harmless disposal (such as composting or incineration). This method does not require a water source and is suitable for arid areas or highly mobile scenarios, but requires addressing the cost of plastic bag recycling and treatment.

4. Foam Sealing Type
   Foam generated by a foaming liquid mixture covers the inside of the toilet bowl, replacing flushing. The foam is delivered by compressed air, and the system only requires a small amount of hand-washing water to meet foaming needs. The sewage mixes with the foam and enters a collection tank for regular suction treatment. This technology has significant water-saving effects and can effectively suppress odors, but requires regular replenishment of the foaming liquid and cleaning of the collection tank.

5. Microbial Type
   Waste is separated into feces and urine through a solid-liquid separation device. Feces enter a fermentation tank, where they are mixed with wood chips and biological strains and decomposed by microorganisms into CO₂ and H₂O (degradation rate ≥ 99%); urine is treated through aeration, evaporation, and decolorization processes to form reclaimed water, which is recirculated to flush urinals. This method is highly environmentally friendly but has high equipment costs and is suitable for long-term fixed-use locations.

Selection Advice: In water-scarce areas, dry packaging or foam sealing types can be prioritized; for scenarios with high environmental protection requirements, microbial or recirculating flush types are suitable. Regardless of the type, regular maintenance (such as suction, replenishment of biological strains or foaming liquid) is key to ensuring normal operation.