How Do Mobile Toilets Handle Defecation
The defecation methods of mobile toilets vary depending on their design and treatment types, mainly including the following:
Water-flushing direct-discharge type: It uses a water-flushing device to directly flush excrement into the sewer pipes, relying on supporting sewage pipes and septic tanks. Some designs utilize gravity for sewage discharge, using pipes with a diameter of 100 - 150 millimeters to discharge into the municipal sewage network by taking advantage of terrain elevation differences. This method is suitable for areas with a well-established sewage system, but the septic tanks need to be cleaned regularly.
Waterless flushing and packaging type: It uses special packaging bags to collect excrement without a flushing device. After use, staff package it and transport it to designated locations for treatment. The dry-packaging type automatically replaces the bags with biodegradable plastic bags. A new bag is replaced after each use, and they are collected centrally and transported to treatment plants for disposal, preventing odor leakage.
Foam-blocking type: It uses foaming liquid to cover excrement, forming an isolation layer to prevent direct contact with the ground. When the excrement accumulates to a certain amount, it is pumped away by a fecal suction truck. This technology replaces flushing with foam, requiring only a small amount of water for hand-washing to meet the foaming needs, significantly saving water resources.
Microbial degradation type: It separates urine and feces through a solid-liquid separation device for separate treatment. Feces enter a fermentation tank and are decomposed into carbon dioxide and water under the action of microbial bacteria, with a degradation rate of over 99%. Urine is filtered and then enters a comprehensive treatment system, where it is converted into reclaimed water through aeration, evaporation, and other processes for flushing urinals, forming a recycling loop.
Recirculating water-flushing type: It is equipped with intermittent aerobic and anaerobic treatment devices and adds biological bacteria to accelerate the fermentation and decomposition of fecal sewage. The treated water is recycled for flushing sanitary ware, reducing the number of pump-outs and water consumption, suitable for water-scarce areas or high-frequency use scenarios.
Vacuum collection system: It creates negative pressure in the pipes through a vacuum pump to quickly suck feces into a collection tank. This system has strong suction power and small pipe diameters (50 - 80 millimeters), suitable for short-term large-scale collection, but the collection tank needs to be cleaned regularly.
Compression and discharge technology: It uses mechanical devices to compress feces, reducing their volume, and then transports them through pipes to storage or treatment points. The compression ratio can reach 1:3 to 1:5, effectively reducing transportation costs and suitable for scenarios with limited space.
