Zhangye Water Circulation Mobile Toilet

The Zhangye water circulation mobile toilet is an environmentally friendly mobile toilet designed based on a water circulation system, achieving the dual goals of water conservation and ecological protection through wastewater treatment and reuse technology.

Working Principle and System Composition

The water circulation system divides wastewater into two paths:

1. Wastewater Treatment Process: Used wastewater first enters the collection module, where solid impurities are removed by a filtration device. It then proceeds to the treatment module, where biological degradation (e.g., microbial decomposition of organic matter) or chemical treatment (e.g., oxidation decomposition) techniques are employed to further break down pollutants. Finally, disinfection (e.g., ultraviolet or chlorine disinfection) is used to kill microorganisms, ensuring the water quality meets hygiene standards.
2. Water Circulation and Reuse: The treated clean water is stored in a clean water tank and reused for toilet flushing through a delivery module (pump and pipes), forming a closed-loop cycle. The system also includes a raw water tank to temporarily store untreated wastewater, ensuring the continuity of the treatment process.

Water Conservation and Ecological Adaptability

Zhangye is located in an arid and semi-arid region with scarce water resources. Traditional toilets rely on continuous external water supply, which can exacerbate water supply pressures. The water circulation mobile toilet achieves water conservation through the following designs:

• Efficient Water Conservation: Each flush requires 70%-80% less makeup water compared to traditional toilets, significantly reducing overall water consumption due to the reuse of treated water.
• Energy Optimization: The energy consumption of the equipment is concentrated in the water pump and treatment units. Some scenic spots use solar power as an auxiliary energy source, reducing reliance on external energy supplies.
• Environmental Adaptability: In response to the characteristics of large diurnal temperature variations and frequent sandstorms in arid regions, pipes and water storage equipment are equipped with thermal insulation and anti-freezing layers. Air inlets and filtration devices are regularly cleaned to prevent clogging. The system's load capacity can adapt to fluctuations in tourist numbers in scenic spots, ensuring normal operation during peak periods.

Treatment Effectiveness and Hygiene Standards

The system ensures water quality safety through multiple indicators:

• Microbial Control: The disinfection process keeps the total bacterial count within hygiene standards, preventing cross-infection.
• Pollutant Removal: Significant reductions in chemical oxygen demand (COD) and suspended solids (SS) values indicate effective decomposition of organic matter and solid impurities.
• Sensory Experience: The treated water is transparent and odorless, directly enhancing the user experience.

Exploration of Technological Diversification

In addition to water circulation technology, companies such as Zhangye Lanbiao Biotechnology Co., Ltd. have also developed waterless flush toilets, utilizing source separation equipment and patented biological decomposition technologies, further demonstrating local innovation in the field of environmentally friendly toilets.