Where Does the Excrement in Mobile Toilets Go
The disposal of excrement in mobile toilets varies depending on their type, with common methods including discharge into sewer pipes, packing and transporting away, suction by fecal suction trucks, microbial degradation, or recycling and treatment before discharge.
Water-flush direct-discharge type: These mobile toilets are equipped with a water-flush device that directly flushes excrement into sewer pipes through water flow. This disposal method requires the toilet location to have supporting sewage pipes and septic tanks to ensure that excrement can smoothly enter the urban sewage treatment system. Its advantages include high treatment efficiency and a user experience similar to that of ordinary fixed toilets, but it relies on well-developed municipal sewage facilities.
Waterless packing type: This type of toilet uses special packing bags to collect excrement. After use, staff seal the full packing bags and transport them to designated garbage or fecal treatment sites. This method does not require a water source or sewage pipes and is suitable for areas lacking water or sewage facilities, such as the wilderness or temporary event venues, but requires regular cleaning and transportation of the packing bags.
Foam-sealing type: A foaming device generates foam to cover the surface of excrement, forming a sealed layer to reduce odor emission. When the excrement in the toilet accumulates to a certain amount, a fecal suction truck sucks it away. This method saves water and effectively controls odors but requires regular maintenance and the cooperation of a fecal suction truck, making it suitable for venues with high environmental protection requirements.
Microbial degradation type: A solid-liquid separation device is used to separate urine and feces for separate treatment. Feces are decomposed into carbon dioxide and water by microbial flora, with a degradation rate of over 99%. Urine can also meet environmental protection discharge standards after treatment. This disposal method is environmentally friendly and efficient, requiring no frequent cleaning, but has high equipment costs and maintenance requirements, making it suitable for long-term use venues.
Recirculating water-flush type: Intermittent aerobic and anaerobic treatment devices are configured to accelerate the fermentation and decomposition of excrement by adding biological strains. The treated water can be recycled for flushing toilet fixtures. This method achieves water resource recycling and reduces water consumption but requires regular supplementation of biological strains and maintenance of treatment equipment.
Regardless of the disposal method used, the excrement from mobile toilets must ultimately be poured into designated sewage outlets or septic tanks in accordance with design, usage regulations, and environmental protection requirements to ensure no environmental pollution.
