Mobile Toilet Storage Space
The storage space of mobile toilets mainly refers to the volume of the sewage tank (black water tank), which varies depending on the type and is generally classified into three categories: small, medium, and large.
The sewage tank capacity of small single-unit toilets is approximately 200-300 liters, commonly found in parks, temporary events, and other settings. These toilets are compactly designed and suitable for an average daily usage of 50-100 people. According to the Urban Public Toilet Design Standard (CJJ 14-2016), their capacity must meet short-term, high-frequency usage demands while facilitating regular cleaning. For example, if a single-unit toilet in a park receives an average of 80 people per day, its 250-liter sewage tank can typically support 1-2 days without cleaning, depending on usage frequency and the volume of waste per use.
The sewage tank capacity of medium-sized trailer-mounted toilets ranges from 400-600 liters, primarily used in construction sites, long-term outdoor operations, and similar settings. These toilets are designed to accommodate dense populations and longer cleaning intervals. For instance, the KCH-450 trailer-mounted toilet by Koch has a 450-liter sewage tank, supporting 3-5 days without cleaning. Their design balances capacity and mobility, making them suitable for scenarios requiring flexible deployment but high usage intensity.
The sewage tank capacity of large container toilets can reach 800-1000 liters, often seen at music festivals, sports events, and other large gatherings. Some models are equipped with dual sewage tanks to further extend cleaning intervals. For example, according to Satellite Industries' technical manual, a certain model of container toilet has a total sewage capacity of 1000 liters, supporting 2-3 days without cleaning even with an average daily attendance of 500 people. The dual-tank design improves efficiency through alternating use or independent drainage, making it particularly suitable for high-traffic settings with limited cleaning conditions.
The choice of sewage tank capacity should consider usage scenarios, average daily attendance, and cleaning intervals. Small toilets are suitable for low-frequency, short-term use; medium toilets balance capacity and mobility; large toilets meet high-intensity, long-term usage demands through large capacity or dual-tank designs. In practice, further optimization is needed based on local environmental requirements, waste disposal methods (such as pumping or direct drainage), and other factors.
