Detailed Explanation of the Working Principle of Mobile Toilets

The working principle of mobile toilets can be divided into two categories based on their types: traditional water-flushing and waterless types, with the core mechanisms revolving around waste treatment and discharge.

Traditional Water-Flushing Mobile Toilets
Their working principle is based on a separate treatment system for clean water and wastewater. Structurally, the clean water tank is usually located on the front right side of the toilet. Users fill the tank by turning on the valve, and the clean water is transported through pipes to the flushing device. During flushing, a foot-operated device controls the water flow, flushing the waste in the toilet bowl into the wastewater tank below. The wastewater tank is connected to the fecal storage tank, where the waste is temporarily stored and periodically transported and treated by specialized vehicles. This type of toilet relies on a continuous water supply and is suitable for locations with water supply and drainage facilities, but requires regular cleaning of the wastewater tank to prevent odor diffusion.

Waterless Mobile Toilets
These toilets do not require traditional water flushing and achieve waste treatment through physical, biological, or chemical technologies. Common types and their principles are as follows:

• Mechanical Packaging Type: Uses biodegradable plastic bags to wrap the squatting position. After excretion falls into the bag, a mechanical device automatically seals the bag opening and transfers it to the fecal storage tank. This method does not require water but requires regular replacement of plastic bags, making it suitable for temporary events or waterless environments.
• Microbial Degradation Type: Utilizes aerobic microorganisms to decompose organic matter, accelerating fermentation and killing pathogens through high-temperature environments (usually 50-70°C). The treated residue can be used as organic fertilizer, meeting environmental protection requirements, but requires control of temperature and microbial balance.
• Foam Sealing Type: Mixes foaming liquid with air to generate foam that covers the surface of the toilet bowl, forming a lubricating layer that allows excretion to slide into the pipes while isolating odors. The foam reduces water consumption but requires regular replenishment of the foaming liquid.
• Vacuum Suction Type: Creates negative pressure in the pipes through a vacuum pump, instantly sucking waste into the treatment tank. This method has high treatment efficiency and saves water, but the equipment cost is relatively high, making it suitable for high-traffic locations.
• Chemical Agent Type: Adds chemical agents to the fecal storage tank to degrade excretion and suppress odors through oxidation and decomposition. This method is simple to operate but requires regular cleaning of the fecal storage tank and replenishment of agents.

Waterless toilets comply with the GB/T18092-2000 standard, achieving a water-saving rate of over 90%. They are widely used in areas without water supply and drainage facilities, such as scenic spots and construction sites. Their core advantages lie in reducing water consumption and environmental pollution, but appropriate maintenance methods must be selected according to the type to ensure long-term stable operation.