Dingxi Outdoor Mobile Toilet Construction
The construction of outdoor mobile toilets in Dingxi requires comprehensive consideration from multiple aspects, including materials, treatment technologies, water circulation, ventilation, power supply, site selection, and maintenance.
Material Selection: The outer shell often employs lightweight, high-strength composite materials, while the internal structure balances corrosion resistance and ease of cleaning. For instance, the mobile toilets in Dingxi parks utilize a lightweight steel keel frame system, with wall panels made of 50mm-thick metal carved sandwich panels and roofs constructed from 0.5mm-thick galvanized aluminum-zinc color-coated steel sheets, ensuring both structural stability and adaptability to outdoor environments.
Treatment Technologies: Appropriate methods must be selected based on climatic conditions. In Dingxi, the low winter temperatures affect microbial activity, necessitating the use of cold-resistant bacterial strains or auxiliary heating for biodegradation technologies. During summer high temperatures, it is essential to control the pressure and odor within sealed containers, making chemical decomposition or physical storage technologies more suitable.
Water Circulation System: Independent of the municipal water supply network, the system centers around an integrated treatment tank that includes three-stage filtration and biological treatment units. The treated graywater can be used for toilet flushing, enabling approximately 50 daily cycles of use and significantly conserving water resources.
Ventilation System: A negative pressure design is adopted, with an air exchange rate of no less than 20 times per hour. Air intakes are located at the lower part of the toilet compartments, while exhaust outlets are positioned on the roof. Before being expelled, the air passes through an activated carbon adsorption layer (iodine adsorption value > 800 mg/g), effectively removing odor molecules such as ammonia and hydrogen sulfide.
Power Supply: In areas without grid coverage, solar power systems are commonly used. The power output of the photovoltaic panels must be at least 1.5 times the total power consumption of the lighting fixtures, exhaust fans, and heating devices. Deep-cycle gel batteries are employed, with a discharge depth controlled within 50%. The controller features overcharge, over-discharge, and short-circuit protection functions to ensure stable system operation.
Site Selection and Layout: It is necessary to avoid areas with dense underground pipelines and maintain a distance of 10 to 30 meters from major pedestrian paths. A simple geological survey of the foundation (soil bearing capacity > 80 kN/m²) should be conducted, with concrete foundations installed to distribute the load. A 2-meter-wide hard-paved area should be reserved around the site to facilitate the operation of cleaning vehicles.
Maintenance Operations: Daily checks should be conducted on the remaining amounts of disinfectants, deodorizers, and hand sanitizers. Weekly tasks include cleaning solid residues from the septic tank or treatment tank and lubricating mechanical components. Monthly water quality parameter tests (such as COD and SS concentrations) should be performed to ensure treatment efficiency, with all records archived for future reference.
