Tibet Mobile Toilet Design
The design of mobile toilets in Tibet fully takes into account the unique high-altitude environment, adopting a modular structure that encompasses three major modules: treatment, storage, and auxiliary, while also emphasizing the coordination between installation site selection and appearance.
Treatment Unit: For the high-altitude environment, the treatment unit employs biodegradation or physical separation technologies to handle solid waste. It is equipped with an independent urine diversion device to avoid increasing the load through mixed treatment and enhance treatment efficiency. In areas above an altitude of 4,000 meters, the biodegradation unit is specially fitted with a pressure regulation device to maintain reaction efficiency and ensure normal operation in low-pressure environments.
Storage Unit: The storage unit is divided into two isolated chambers to temporarily store solid decomposition products and liquids separately, effectively reducing odor diffusion. Flexible connection materials are used to prevent pipeline damage caused by thermal expansion and contraction due to the large temperature differences between day and night in high-altitude areas. The insulation layer is thickened to twice that of low-altitude regions, ensuring that excreta do not freeze in winter and guaranteeing the normal use of the toilets. In terms of cleaning and maintenance, a zoned and tiered management approach is implemented, with the solid storage area cleaned once a month and the liquid storage area disinfected weekly to ensure hygiene conditions.
Auxiliary System: The auxiliary system includes ventilation devices and solar power supply equipment. The ventilation system adopts a passive air duct design, utilizing natural air pressure differences to achieve air circulation without additional energy consumption. Water resource utilization employs a closed-loop design, where hand-washing wastewater is filtered and recycled for toilet flushing, with water consumption per use controlled to less than 0.5 liters. In winter, a waterless mode can be switched to, adapting to the scarce water resources in high-altitude areas. The solar power supply equipment provides stable power support for the toilets.
Installation Site Selection and Appearance: Installation site selection requires comprehensive consideration of geological stability and ecological sensitivity, with soil permeability tests conducted and an elevated bottom design to reduce interference with the permafrost layer. The appearance color is selected in a dark tone that harmonizes with the environment, reducing visual incongrity. Additionally, there are suite-style toilets featuring a combination design with Great Wall-patterned metal carvings, and zero-emission recirculating flush toilets available in various appearances such as landscape, antique, cartoon, mobile, and standard types. The six-unit row toilets adopt a galvanized steel frame structure with waterproof asphalt shingles, allowing for easy relocation by crane to meet different scenario requirements.
