Mobile Toilet Sewage Collector

The workflow and key points of the mobile toilet sewage collector (treatment equipment) are as follows:

The mobile toilet sewage collection and treatment equipment achieves sewage purification and resource utilization through multi-stage collaborative operations. Its core process can be divided into the following steps:

1. Pretreatment Stage: Grille Interception and Sedimentation in the Collection Tank
The sewage first passes through a grille device, which effectively intercepts large solid particles (such as paper towels and debris) and floating objects, preventing them from entering subsequent treatment units and causing blockages or interference. Subsequently, the sewage flows into the collection tank for preliminary sedimentation, where suspended solids (such as fecal particles and fine impurities) and some organic matter settle to the bottom of the tank by gravity. This stage can remove approximately 30%-50% of the suspended solids, reducing the load for subsequent biological treatment. The collection tank needs to be regularly cleaned of bottom sediments to avoid the accumulation of sludge affecting treatment efficiency.

2. Biological Treatment Stage: Oxidative Decomposition in the Aerated Biological Filter
The sedimented sewage is pumped to the aerated biological filter, which is the core of the equipment's treatment process. The filter is filled with high-specific-surface-area biological media (such as ceramsite and volcanic rock), providing attachment carriers for microorganisms. Under continuous aeration conditions, aerobic microorganisms use the organic matter in the sewage as a nutrient source for metabolic activities, oxidizing and decomposing it into carbon dioxide and water while removing pollutants such as ammonia nitrogen. The aeration process not only supplies oxygen to the microorganisms but also keeps the media layer active through water flow agitation, preventing compaction. This stage can remove more than 80% of the organic matter, significantly reducing the chemical oxygen demand (COD) of the sewage.

3. Advanced Treatment and Discharge: Disinfection and Sludge Disposal
The sewage after biological treatment needs to undergo a disinfection step (such as adding chlorine tablets or ultraviolet irradiation) to kill pathogenic microorganisms and ensure that the effluent meets discharge standards such as the "Reuse of Urban Recycled Water - Water Quality Standard for Urban Miscellaneous Water Consumption" (GB/T 18920-2020) before being discharged. The remaining sludge is discharged into a sludge tank, where its volume is reduced by thickening, and then further stabilized through digestion treatment (such as aerobic or anaerobic digestion). Finally, it is dewatered to form sludge cakes. The water content of the dewatered sludge can be reduced to below 60%, and it can be used as organic fertilizer for greening or as cover soil for landfills, achieving resource recycling.

Equipment Maintenance and Operation Requirements
To ensure treatment effectiveness, the equipment requires regular maintenance: the grille should be cleaned daily, the collection tank should be drained of sludge monthly, and the biological filter should be backwashed quarterly to clean the media. Operators need to be professionally trained, familiar with parameter adjustments such as aeration rate control and disinfectant dosage, and wear protective equipment to avoid contact with untreated sewage.