External Drainage for Mobile Toilets

Whether a mobile toilet requires external drainage depends on its type and configuration.

Common Types and Drainage Requirements

1. Microbial Degradation Type: Utilizes a built-in microbial treatment system to biologically decompose waste, eliminating the need for external water pipe drainage. This type of toilet is suitable for scenarios without municipal sewer networks or where water sources are scarce, such as in the wilderness or at temporary event venues.
2. Flush Type: Relies on an external water pipe to provide flushing water and requires connection to a municipal drainage network or an independent septic tank. Its flushing function depends on a continuous water flow, and failure to connect to external drainage will result in sewage accumulation, affecting usability.
3. Storage Tank Assisted Type: Equipped with a storage tank to reduce dependence on external water sources, but still requires external water replenishment during peak usage periods. This design is suitable for scenarios with significant fluctuations in water consumption, such as temporary construction sites or large-scale event venues.

Installation Steps for External Drainage

1. Determine Drainage Location: Select an area closest to the bottom of the toilet and convenient for connecting to the municipal sewer network. The slope should be ≥2% (a drop of 2 cm per meter) to ensure self-flowing sewage discharge and prevent backflow.
2. Pipe Laying: Use PVC-U pipes (recommended outer diameter of 110 mm and inner diameter of 103 mm), adopt a bell-and-spigot connection and apply special glue. Install rubber gaskets at the joints to prevent leakage.
3. Anti-Seepage Treatment: Install a waterproof flange at the connection between the pipe and the toilet base, and fill the gaps with weather-resistant sealant to prevent sewage from corroding the base structure.
4. System Testing: Inject water to check the pipe's tightness and ensure no leakage. Test the drainage flow rate, which should be ≥0.6 m/s to prevent solid deposition and pipe blockage.

Precautions

• If a flush-type toilet is not connected to external drainage for an extended period, it may lead to sewage overflow or odor diffusion, necessitating regular cleaning of the sewage storage tank.
• Microbial degradation-type toilets require regular addition of microbial strains and maintenance of the ventilation system to ensure decomposition efficiency.
• In cold regions, insulation treatment of the drainage pipes is necessary to prevent freezing and cracking, which could affect usability.