Construction of Mobile Toilets in Changyi District

The construction plan for mobile toilets in Changyi District centers on the composite technology of 'foam sealing + microbial degradation', combined with modular design and cold-resistant materials, ensuring stable operation in northern cold climates while meeting water conservation, environmental protection, and accessibility requirements.

I. Technology Selection and Core Functions

1. Composite Technology System: Utilizes Beijing Anbangjie Technology's patented 'foam sealing + microbial degradation' technology, suitable for extreme low temperatures of -30°C. Foam sealing employs a stainless steel squat toilet (with an inner wall smoothness of Ra0.8μm) paired with cold-resistant foaming liquid (non-freezing at -35°C), producing 0.3L of foam per use to block odors for ≥4 hours. Microbial degradation relies on a double-chamber nested fermentation tank (inner chamber 80L, outer chamber filled with insulating sand particles), equipped with temperature sensors and electric heating devices to maintain fermentation temperatures of 55-60°C in winter. It selects psychrophilic bacteria species and other cold-resistant strains, achieving a fecal resource utilization rate of over 95%.
2. Energy Adaptation Plan: In areas with ample sunlight (such as Wenshan Park), 200W solar photovoltaic panels + 12V batteries are installed, generating an average daily electricity output of ≥1.2kWh to meet lighting, ventilation, and fermentation auxiliary heating needs. Other areas are supplemented with mains electricity to ensure energy stability.

II. Material and Structural Optimization

1. Toilet Body Structure: Adopts Q345B light steel keels + 50mm polyurethane sandwich panels (supplier: Jilin City Anguang Environmental Protection), balancing strength and thermal insulation performance. The insulation layer uses centrifugal glass wool (thermal conductivity ≤0.032W/m·K, supplier: Changchun Xinda), effectively reducing heat loss.
2. Key Components: The microbial agent is a cold-resistant concentrated type (effective viable count ≥10⁹ CFU/g, supplier: Jilin Huankang), ensuring activity in low-temperature environments. The foaming liquid is a food-grade surfactant (pH 6.5-7.5, supplier: Shenyang Jielan), environmentally friendly and non-irritating.

III. Construction Process and Quality Control

1. Preliminary Preparation: Use RTK surveying instruments for positioning and layout, avoiding underground pipelines (gas, electricity). Areas with frost depth ≥1.5m are pre-treated with frost breakers. The toilet body's steel structure is prefabricated in a factory with pre-installed electrical wiring and ventilation systems, then assembled on-site by hoisting (single unit ≤3.5 tons, using a 25T truck crane).
2. Key Processes: Fermentation tank sealing employs butyl rubber seals + stainless steel clamps to ensure airtightness. Construction personnel must undergo cold-resistant construction training, focusing on mastering fermentation tank installation and electric heating device debugging.
3. Acceptance Criteria: Complies with Jilin Province's 'Public Toilet Construction Standards' (DB22/T 5044-2023), achieving a 100% first-time acceptance rate and 100% coverage of third toilets and accessibility facilities.

This plan achieves a balance between water conservation, emission reduction, and user experience through technological integration, material localization, and construction standardization, providing a replicable solution for upgrading public toilets in cold northern regions.