Qinghai Public Ecological Mobile Toilet

The Qinghai Public Ecological Mobile Toilet is a decentralized sanitation solution designed specifically for the characteristics of high-altitude environments, featuring ecological treatment, flexible mobility, resource recycling, and sustainable operation.

Core Functional Units and Technical Features

The Qinghai Public Ecological Mobile Toilet consists of three core units:

1. Collection and Isolation Unit: Utilizes vacuum or micro-flushing technology to achieve sealed storage of waste through physical separation. This design significantly reduces water consumption (over 80% less than traditional toilets) while using a sealed structure to prevent odor diffusion, adapting to the arid conditions of high-altitude regions.
2. Biological Treatment Unit: Contains psychrophilic microbial communities capable of continuously decomposing organic matter at temperatures ranging from -20°C to 10°C. The activity of these microbial communities is maintained through heating and insulation devices (such as electric heating films or ground-source heat pumps) to ensure treatment efficiency. For example, the ecological public toilet in Malayi Village, Maduo County, uses a photovoltaic-powered insulation system to keep microbial activity above 15°C at night.
3. Terminal Output Unit: Transforms treated residues into two types of resources:
   • Solid Products: After heavy metal detection and high-temperature inactivation (typically ≥70°C for 1 hour), they can be used as soil amendments for ecological restoration, with an organic matter content exceeding 40%.
   • Liquid Products: After disinfection with ultraviolet light or ozone, they meet the Standards for Irrigation Water Quality (GB5084-2021) and can be used for drip irrigation of non-edible crops. However, real-time monitoring of indicators such as pH and COD (Chemical Oxygen Demand) is required to prevent secondary pollution.

Mobility and Operational Adaptability

The toilet adopts a modular design, with its main structure modified from standard shipping containers, allowing rapid transportation by truck to scenic spots, construction sites, and other locations. The treatment system (such as biological reactors and fecal storage tanks) supports independent disassembly and replacement, enabling maintenance without shutting down the entire facility. In terms of operation and maintenance, most equipment employs a hybrid energy supply model:

• Energy Supply: Solar photovoltaic panels (with an average daily power generation of 5-8 kWh) meet the electricity needs for lighting and control systems, supplemented by small wind turbines (suitable for strong wind areas above 3,000 meters in altitude) or fuel cells (to cope with seven consecutive days of rainy weather).
• Thermal Management: Phase change materials (such as paraffin) store excess thermal energy during the day and release it at night to maintain the temperature of biological reactors, ensuring sustainable operation for over 30 days in areas without grid coverage.

Application Scenarios and Operational Models

1. Basic Model: Factory-prefabricated mobile restrooms equipped with separate facilities for men and women and barrier-free compartments, ready for use upon connection to water and electricity supplies. Suitable for seasonal high-traffic areas such as Qinghai Lake scenic spots and the Sanjiangyuan Nature Reserve.
2. Resource Recovery Model: For example, the photovoltaic micro-flush ecological public toilet in Maduo County integrates photovoltaic power generation, micro-flushing (with a single water consumption of ≤0.5 L), and resource recovery treatment, serving local herders and tourists.
3. Market-Oriented Operation: Hainan Prefecture explores a "business-supported toilet" model, embedding cultural and creative exhibitions, charging stations, vending machines, and other convenient services within public toilets. Commercial revenue covers operational and maintenance costs, transforming the facilities from "consumptive infrastructure" to "cultural and tourism stations."

Typical Case Study

In June 2026, State Grid Zhejiang Electric Power and Tsinghua University team completed the construction of a 235-square-meter photovoltaic ecological public toilet in Malayi Village, Maduo County. The facility employs monocrystalline silicon photovoltaic panels (with an installed capacity of 15 kW) and a lithium-ion battery energy storage system, combined with micro-flushing technology. It processes 200 kg of waste daily, with liquid products used for irrigation of surrounding grasslands and solid products for rehabilitation of sandy land, serving as a benchmark project for ecological toilets in high-altitude, water-scarce regions.