How to Dispose of Feces in Mobile Toilets

There are various ways to dispose of feces in mobile toilets, including water-flush and non-water-flush suction types, recirculating water-flush types, dry-packing types, foam-sealing types, microbial types, chemical treatment, anaerobic digestion, compression and storage, multi-functional sewage outlets, and mechanical treatment, etc..

Water-flush mobile toilets are equipped with a water-flush device, with a water tank placed on top and a sewage tank at the bottom; non-water-flush types have no flushing device, and the excreta is directly received by the sewage tank at the bottom. For both types, the sewage tank has a relatively small capacity and needs to be suctioned out in a timely manner when a specified number of people have used it.

Recirculating water-flush types are equipped with intermittent aerobic and anaerobic treatment devices for fecal sewage. Biological bacteria are added, and biological membrane technology is used to accelerate the fermentation and decomposition of fecal sewage. Then, the treated sewage is recirculated through a filtration device to flush the toilet fixtures, saving water resources and reducing the number of suction operations.

Dry-packing types have no water-flush device. The excreta is received by a biodegradable plastic bag at the lower part of the fixture. A new plastic bag is automatically replaced after each use by one person. After use, they are collected and transported to a treatment plant for disposal. No water flushing is required at all, saving water resources and facilitating the collection of waste.

Foam-sealing types use foam generated by a foaming liquid mixture instead of toilet flushing water. There are foam channels on the side walls of the fixtures, and compressed air makes the foam cover the inner side of the toilet bowl, eliminating odors. The system can meet the foaming water demand by collecting hand-washing water, saving water resources.

In microbial types, the excreta enters a solid-liquid separation device through an automatically opening toilet bowl. The urine is filtered, and the feces are separated for separate treatment. The feces enter a fermentation tank and are decomposed into CO₂ and H₂O under the action of microbial bacteria, with a degradation rate of ≥99%; the urine is treated into reclaimed water and used to flush the urinal again, forming a cycle.

Chemical treatment involves using chemical agents to decompose and eliminate excreta. Agents are added to control odors and promote decomposition. The treated excreta is further processed through specialized equipment or flows into the sewage system.

Anaerobic digestion utilizes an anaerobic digestion system where microorganisms decompose and digest the excreta, producing biogas (which can be used as an energy source) and fertilizer (which can be used in agriculture or horticulture), reducing the volume and delaying the treatment demand.

Compression and storage reduce the volume of excreta by compressing and storing it, delaying the treatment demand. It is suitable for situations where one is away from the treatment facilities for a long time, such as camping or construction sites in the wild.

Multi-functional sewage outlets are equipped with manual cleaning functions, such as fecal storage tanks or pre-buried septic tanks, which require regular manual cleaning to store and then collectively treat the feces.

Mechanical treatment uses specialized equipment for solid-liquid separation, decomposition, and disinfection, etc., reducing the impact on the environment and ensuring hygiene and safety.