Water in the Sewage Tank of Mobile Toilets
The water treatment methods for the sewage tanks of mobile toilets vary depending on the type of toilet, mainly falling into the following categories:
1. Water-flush and Non-water-flush Suction-type Mobile Toilets Water-flush mobile toilets use a top water tank to flush feces into the bottom sewage tank, while non-water-flush types directly receive excreta in the bottom sewage tank. The sewage tanks of these two types of toilets have relatively small capacities and are typically designed to require timely suction after serving a certain number of users. Otherwise, overflow may lead to sanitation issues or equipment damage. The suctioned sewage needs to be transported to professional treatment facilities for further purification through septic tanks, biological treatment, or municipal sewage networks. Their core feature is reliance on external suction services for operation, making them suitable for short-term events or scenarios with controlled foot traffic.
2. Recirculating Water-flush Mobile Toilets This type achieves water resource recycling through biological treatment technology. It is equipped with intermittent aerobic and anaerobic treatment units internally. After adding specific biological strains, it utilizes biofilm technology to accelerate the fermentation and decomposition of fecal sewage. The decomposed liquid undergoes multi-stage filtration (such as sand filtration and activated carbon filtration) to remove impurities and odors, ultimately meeting flushing standards and being reused for toilet fixtures. This technology can reduce water consumption by over 80% and lower the suction frequency to 1/5 of that of traditional toilets, making it suitable for water-scarce areas or long-term use scenarios. However, it requires regular replenishment of biological strains and monitoring of water quality to ensure treatment efficiency.
3. Foam-sealing Mobile Toilets A foaming device mixes a small amount of water (only hand-washing water is needed) with foaming liquid to generate dense foam that covers the surface of the toilet bowl. The foam layer effectively blocks odors and reduces contact between feces and air while utilizing lubrication to reduce flushing water volume. Excreta directly enter the bottom collection tank and are periodically suctioned for treatment. These toilets offer significant water-saving effects but require regular replenishment of foaming liquid. Additionally, foam stability is greatly affected by temperature, making them more suitable for warm and dry environments.
4. Vacuum Suction Type (Vehicle-mounted Mobile Toilets) Using a vacuum pump to generate negative pressure, excreta are instantly sucked into the collection tank, with only a small amount of water (about 0.5 liters per use) needed to flush the pipes during the process. When the collection tank is full, it is transported by a sealed tanker to a treatment station for solid-liquid separation and disinfection operations. This technology achieves a water-saving rate of over 90% and is convenient for mobile deployment, often used in large-scale events, disaster relief, or enclosed scenarios such as trains and ships. However, the equipment cost is relatively high, requiring supporting professional transport vehicles.
