Principle of Marathon Mobile Toilets

The principle of marathon mobile toilets is based on the coordinated operation of multiple systems, including material structure, sewage discharge, odor removal, waste treatment, and water resource recycling. Through modular design and advanced technology, they achieve efficient and environmentally friendly temporary sanitation facilities.

1. Material and Structural Design
The outer shell is made of high-density polyethylene or fiberglass-reinforced plastic, featuring strong weather resistance, impact resistance, and light weight, facilitating easy transportation and rapid assembly. The interior adopts a modular structure, assembled from prefabricated components such as chassis frames, wall panels, and roof units. The module dimensions are precisely calculated to comply with road transportation width restrictions. The interior layout is optimized based on ergonomic data to ensure user comfort and space utilization.

2. Sewage Discharge System
It relies on negative pressure technology instead of traditional gravity drainage. After use, the trigger device activates a diaphragm pump or rotary vane pump, creating a sub-atmospheric environment in the collection tank, allowing waste to enter the sealed container along a short path while preventing odor backflow through air pressure differences. A biodegradable coagulant is added to the collection tank, where its molecular chains combine with liquids to form gel-like solids, reducing the risk of spillage during transportation and lowering the difficulty of subsequent treatment.

3. Odor Removal Mechanism
It employs a combination of physical adsorption and oxidative decomposition:

• Activated carbon filter: Captures volatile molecules such as sulfides;
• Photocatalytic oxidation device: Ultraviolet light activates a titanium dioxide coating to decompose ammonia compounds into harmless gases;
• Bidirectional airflow ventilation system: Fresh air enters from the top, while stale air is extracted from the bottom, forming a vertical air curtain to isolate odors;
• Negative pressure exhaust principle: A low-power exhaust fan at the top draws out internal air in a targeted manner, while fresh air enters from the bottom after being filtered, creating a stable airflow circulation that can reduce ammonia and hydrogen sulfide concentrations by over 60%.

4. Waste Collection and Preliminary Treatment
Solid-liquid separation is achieved through hierarchical isolation technology:

• Liquid tank: Microbial degradants are added, with selected strains decomposing urea into carbon dioxide and water within 8 hours;
• Solid tank: Biodegradable plastic bags are used, pre-mixed with wood ash and humus to inhibit pathogen proliferation and provide conditions for composting.

5. Water Resource Treatment
High-end models are equipped with a recycling flushing system that purifies sewage through three-stage treatment:

• Sedimentation tank: Centrifugal separation removes solid particles;
• Filtration layer: A combination of quartz sand, activated carbon, and ion exchange resin for filtration;
• Disinfection stage: Electrolysis of saltwater produces hypochlorous acid, which is easier to control in concentration than chemical agents, ensuring safe reuse of flushing water.