Portable Toilet Sewerage
The sewerage design of portable toilets varies depending on the type, primarily involving core functions such as sewage storage, discharge, and odor treatment.
1. Sewerage Design for Lightweight Plastic Portable Toilets
These toilets typically use a combination of gravity flushing and a sewage tank. Their core components include a gravity flushing device, a foot pump, and an exhaust pipe. Users pressurize the water for flushing using the foot pump, and the sewage flows into the bottom sewage tank under gravity. The design of the exhaust pipe is crucial as it expels odors outdoors through negative pressure, preventing internal air pollution. Some models are also equipped with a full-level indicator for the sewage tank, facilitating timely cleaning.
2. Sewerage System for Water-Flush Portable Toilets
Water-flush toilets fall into two categories: one relies on an external water source, using a large-capacity freshwater tank (usually 200-500 liters) to provide flushing power, with sewage discharged directly into municipal sewers or independent storage tanks; the other is a recirculating water-flush type, which uses biodegradation or chemical treatment technologies to purify sewage, enabling water reuse. The fecal sewage storage tank is a core component, requiring corrosion-resistant materials (such as stainless steel or high-density polyethylene) and a capacity ranging from 500-2000 liters depending on the usage scenario (e.g., scenic spots, construction sites). Some high-end models are also equipped with automatic sewage pumps that can periodically pump sewage to external treatment facilities.
3. Sewerage Solutions for Waterless Portable Toilets
- Dry Packing Type: Collects feces in biodegradable plastic bags, eliminating the need for a sewerage system. Each use automatically seals the bag, which is replaced when full. This design is suitable for water-scarce areas or temporary events but requires regular garbage bag disposal.
- Suction Type: Uses a vacuum pump or negative pressure device to suction feces into an external fecal storage tank, suitable for large events or fixed locations. Its advantage lies in preventing odor leakage, but it requires professional suction trucks for regular cleaning and transportation.
4. Auxiliary Equipment: Application of Toilet Offset Connectors
Although not exclusive to portable toilets, toilet offset connectors can solve the issue of mismatched sewage outlet positions. Their offset distance is generally 5-10 centimeters, with special cases up to 15 centimeters. Two points to note: First, the drainage slope should be maintained at over 2% to prevent sewage backflow; second, excessive offset distances may increase the risk of blockage, so it is advisable to prioritize short-distance offsets or adjust the toilet layout.
In summary, the sewerage design of portable toilets must comprehensively consider usage scenarios, water resource conditions, and environmental requirements, selecting appropriate sewage treatment methods and auxiliary equipment to achieve efficient and hygienic usage experiences.
