Principle of Direct Discharge Mobile Toilet
The principles of direct discharge mobile toilets vary depending on their types, mainly divided into two types: direct discharge (connected to municipal sewage networks) and water-flush direct discharge (treated on-site before discharge).
Direct discharge (connected to municipal sewage networks) is primarily suitable for locations with municipal sewage networks nearby. Its working principle is relatively simple and straightforward. By laying pipes, the sewage generated inside the mobile toilet is directly connected to the municipal sewage network. The municipal sewage network is an important part of urban infrastructure, with strong sewage collection and transportation capabilities, capable of transporting sewage to the urban sewage treatment system for centralized treatment. This type of direct discharge mobile toilet does not require complex sewage treatment equipment inside the toilet, reducing construction and operational costs. However, the prerequisite is that there must be a connectable municipal sewage network, and the distance cannot be too far; otherwise, the cost of pipe laying will increase significantly.
The core operation of the water-flush direct discharge (treated on-site before discharge) lies in an integrated on-site treatment system. First is the water supply unit, where a storage tank holds a certain amount of clean water. When toilet flushing is needed, the clean water is released, initiating the entire treatment process. Next is the separation and preliminary treatment chamber. After the sewage and excreta mix and enter this chamber, solid substances are first intercepted through physical filtration, such as large particulate impurities in feces. Subsequently, microbial flora are used for biochemical treatment, where microorganisms can decompose organic pollutants in the sewage, converting them into water, gases, and a small amount of inorganic substances, thereby significantly reducing the chemical oxygen demand and ammonia nitrogen content of the sewage. The deodorization system eliminates odors through adsorption or chemical neutralization principles, differing from traditional ventilation methods and more effectively improving the internal environment of the toilet. Finally, in the discharge unit, after the treated water meets discharge standards, it can be stored in an independent discharge tank or transported by specialized vehicles to a sewage treatment plant for further treatment.
In addition, the structural design of direct discharge mobile toilets includes a collection unit, a treatment unit, and a discharge unit. The collection unit adopts a funnel-shaped design, utilizing gravity to collect waste, allowing it to smoothly enter the treatment unit. The treatment unit converts organic matter into stable substances through biological degradation or chemical decomposition devices, with reaction conditions such as temperature, pH, and oxygen supply automatically controlled by the system to ensure stable treatment effects. The discharge unit follows the principle of pressure balance, where the treated liquid, after multi-layer filtration, is automatically discharged relying on the internal pressure difference of the system without external power, improving the operational efficiency and reliability of the equipment. The entire process is completed in a closed loop inside the equipment without relying on external networks.
