Where Does the Feces from Mobile Toilets Go?
The discharge location and method of feces from mobile toilets vary, primarily depending on the type of toilet and its technological principles.
1. Vacuum Sewage Pump or Sealed Sewage Truck Treatment Some mobile toilets use vacuum sewage pumps or sewage pumps installed beneath the main body to suck feces through pipes and temporarily store them in an internal collection tank. When the tank's capacity approaches its limit, a sealed sewage truck is used to suction and transport the feces through a dedicated interface to a municipal sewage treatment plant for centralized treatment. This method is suitable for fixed-installation mobile toilets and requires regular maintenance of the sewage extraction equipment and ensuring the airtightness of the transportation process to avoid secondary pollution.
2. Biodegradation Technology Treatment Degradable mobile toilets direct feces through pipes into a biodegradation container beneath the squatting position, where 'probiotics' and other microbial agents are pre-added. After mixing with the agents, the feces are biologically decomposed into water, carbon dioxide, and a small amount of solid residue. The water produced from decomposition is purified into 'reclaimed water' through a multi-layer filtration device, which can be used for toilet flushing or green irrigation; the solid residue settles at the bottom of the container and requires regular manual cleaning. Such toilets require strict control of the activity of the microbial agents and the ambient temperature and humidity to ensure decomposition efficiency.
3. Degradable Plastic Bag Packaging Treatment Packaging-type mobile toilets use degradable plastic bags to collect feces, which are automatically sealed and replaced with new bags after each use. The inner layer of the plastic bags usually has a leak-proof coating, and the outer layer is marked with biodegradation labels. The collected plastic bags are transported to a professional treatment plant for harmless treatment through high-temperature composting or chemical decomposition. This method is suitable for temporary scenarios without water and electricity supply, but it is necessary to ensure that the quality of the plastic bags meets environmental standards.
4. Vacuum Suction and Discharge System Treatment Suction-and-discharge mobile toilets use a vacuum pump to generate negative pressure, quickly sucking feces into a collection tank made of high-strength composite materials and equipped with an anti-backflow valve. Such toilets are mostly used in mobile scenarios such as vehicles or high-speed trains. When the collection tank is full, it can be connected to a transportation vehicle through a dedicated interface and directly sent to a treatment station. The system requires regular inspection of the vacuum pump's airtightness to prevent gas leakage.
5. Direct Discharge and Feces Tank Combination Treatment A small number of mobile toilets adopt a direct discharge design, requiring connection to municipal drainage pipes for real-time discharge, but such applications are rare. More commonly, a feces tank is used to collect feces, with the tank's capacity designed according to usage frequency and equipped with a liquid level sensor and alarm device. When the feces tank approaches full capacity, the system automatically locks and prompts for cleaning, which requires the use of professional sewage extraction equipment for suction and transfer.
In practical applications, the feces treatment method for mobile toilets needs to comprehensively consider the usage scenario, environmental requirements, and operation and maintenance costs. It is recommended to prioritize the selection of equipment that meets national environmental standards and regularly consult professional institutions for technological upgrades and maintenance.
