Hand-washing Water in Mobile Toilets

The supply method of hand-washing water in mobile toilets is flexibly determined based on the water and electricity conditions of the toilet type and usage scenario, mainly divided into two modes: connected to a fixed water source and without a fixed water source, supplemented by water-saving and hot water supply technologies.

1. Mobile Public Toilets Connected to a Fixed Water Source (e.g., Flush Toilets)

In these toilets, the hand-washing water and flushing water share the same water source. A fixed water source (such as municipal water supply) is connected to the sink faucet through pipes. When the faucet is turned on, a stable water flow is obtained, with water pressure ensured by the municipal water network or booster equipment, providing an adequate supply. After use, the hand-washing water is drained through the sewer pipes into a sewage collection tank or directly connected to the drainage network, preventing water accumulation. This mode is suitable for scenarios with fixed water and electricity facilities, such as parks, scenic spots, and long-term construction sites. Its advantage lies in the fact that it does not require frequent manual water replenishment and can achieve water-saving functions through rainwater collection and filtration systems or hand-washing water secondary flushing technology. For example, environmentally friendly flush-type mobile toilets supplement flushing water by filtering rainwater and recycle hand-washing water for initial flushing, reducing the consumption of fresh water.

2. Mobile Public Toilets Without a Fixed Water Source (e.g., Waterless Flush Toilets)

The hand-washing water supply in these toilets relies on portable water tanks, usually equipped with small water tanks with a capacity of 20-50 liters below the sink. Before use, clean water needs to be manually injected, and water can be obtained by turning on the faucet; after the water in the tank is exhausted, it needs to be regularly replenished. This mode is suitable for scenarios without water and electricity facilities, such as emergency rescue, wild camping, and large-scale events. Its core advantage is convenience and flexibility, without relying on external infrastructure, but it requires manual maintenance of the water tank water level. Some high-end models enhance usability by optimizing water tank design (such as increasing capacity or adding water level indication functions).

3. Water-saving and Hot Water Supply Technologies

To reduce water waste, some mobile public toilets are equipped with water-saving devices:

• Push-type/Inductive Faucets: By limiting the water outlet time or automatically sensing and opening/closing, the water consumption per hand-washing is reduced.
• Hot Water Supply Systems: High-end toilets are equipped with small water heaters that heat the water in the tank through a fixed power supply or solar energy, providing hot water for hand-washing in low-temperature environments. For example, solar-powered water heaters are suitable for outdoor scenarios with sufficient sunlight, while fixed power supply models are suitable for places with power access.

4. Adaptability to Special Scenarios

The flush-type solution for environmentally friendly mobile toilets requires both water inlet and outlet pipes to be connected for normal operation, while the waterless flush type treats excrement by adding biodegradable agents or using packaged designs, with the hand-washing water supply independent of the flushing system. In addition, some mobile public toilets combine the two modes. For example, they use water tank water supply in venues with temporary water sources and reserve pipe connections for subsequent upgrades to a fixed water source mode.