How Mobile Toilets Discharge Sewage
There are various methods for mobile toilets to discharge sewage, including conventional water-flushing, vacuum sewage systems, water-storage sewage systems, biodegradation technology, foam-sealing, dry-packaging types, and recirculating water punching, among others.
Conventional Water-Flushing: This is the most common method of sewage discharge, requiring connection to both water supply and drainage pipes. Through manual or automatic sensing, sewage is discharged into a septic tank or municipal sewer network. It is suitable for various water-rich environments, with relatively low construction costs and simple operation, meeting daily usage needs effectively.
Vacuum Sewage Systems: Utilizing negative pressure principles, vacuum pumps are used to suck sewage and waste into collection containers. When the sewage level in the public toilet reaches a preset level, the vacuum pump automatically starts, quickly completing sewage discharge. This method is highly efficient, uses minimal water, effectively prevents sewage leakage and odor diffusion, and keeps public toilets clean and hygienic. However, equipment and maintenance costs are relatively high.
Water-Storage Sewage Systems: Sewage is flushed into a storage tank through water flushing. The storage tank has a certain capacity and can store a certain amount of sewage. When the storage tank is full, it needs to be cleaned and replaced. This method is suitable for locations with sufficient water supply and easy cleaning, but requires regular maintenance to ensure the normal operation of the storage tank.
Biodegradation Technology: Microbial strains are used to convert organic matter in sewage into harmless substances before discharge. This technology is environmentally friendly and reduces environmental pollution, aligning with sustainable development concepts. However, the treatment process is relatively complex, with high requirements for the cultivation and management of microbial strains.
Foam-Sealing: Foam produced by a foam-liquid mixture is used instead of toilet flushing. The foam covers the inside of the toilet bowl, eliminating odors and effectively conserving water resources. However, the production and maintenance of foam require specific equipment and materials, with relatively high costs.
Dry-Packaging Types: These toilets have no flushing devices, with feces collected by recyclable plastic bags placed beneath the toilet bowl. After each use, a new plastic bag is automatically replaced, and the collected bags are transported to a treatment plant for processing. These toilets use no water for flushing, conserving water resources, but the use and disposal of plastic bags may pose certain environmental issues.
Recirculating Water Punching: Equipped with intermittent aerobic and anaerobic fecal sewage treatment devices, biological strains are added, and biofilm technology is used to accelerate the fermentation and decomposition of fecal sewage. The treated fecal sewage is then recirculated back to the toilet sanitary ware through filtration devices. This method achieves water resource recycling but requires high technical standards and is difficult to maintain.
