Mobile Toilet Decomposition Methods
The decomposition methods for mobile toilets mainly include six categories: chemical treatment, biological treatment, recirculating water flushing treatment, dry packing treatment, foam sealing treatment, and microbial treatment. Details are as follows:
Chemical Treatment Method: By adding chemical reagents such as chlorine gas and sodium hydroxide, organic matter in excreta reacts chemically with water to achieve solid-liquid separation. This method effectively reduces odor and harmful gas emissions, making it suitable for scenarios with high hygiene requirements and chemical reagent storage conditions, such as temporary toilets for large events or remote areas without water and electricity supply. However, attention should be paid to the safety of chemical transportation and storage to avoid secondary pollution.
Biological Treatment Method: Utilizes the metabolic capacity of microorganisms to decompose excreta, with core equipment including fluidized bed anaerobic digestion reactors and filtration systems. It is divided into two categories:
- Solid-Liquid Separation and Microbial Fermentation: After separating feces from urine, feces enter a fermentation tank and are mixed with sawdust and biological strains. Under high-temperature conditions (50-60℃), they decompose into carbon dioxide and water, with a degradation rate of over 99%, and the final product is harmless compost.
- Anaerobic and Aerobic Combined Treatment: In the anaerobic stage, organic matter is converted into biogas (usable as energy) by methanogens, and the remaining residue is further decomposed through aerobic treatment combined with biofilm technology to accelerate the reaction, suitable for public toilets with high foot traffic.
Recirculating Water Flushing Treatment: Adopts an intermittent aerobic and anaerobic biological treatment system combined with biofilm technology to purify sewage. The treated reclaimed water is recycled for flushing toilets, significantly reducing water consumption (over 80% less than traditional toilets) and pumping frequency, suitable for mobile toilets in water-scarce areas or those requiring long-term use.
Dry Packing Treatment: Uses biodegradable plastic bags to collect excreta, with new bags automatically replaced after each use, requiring no water throughout the process. This method is simple to operate and odor-free but requires regular cleaning of the packing bags, suitable for water-scarce areas or temporary event venues.
Foam Sealing Treatment: Generates dense foam through a special foaming agent to cover the inside of the toilet bowl, blocking odor diffusion and reducing flushing water consumption (only 0.2-0.5 liters per flush). Enzymes in the foam assist in decomposing excreta, suitable for scenarios with high water-saving requirements, such as tourist attractions or ecological protection zones.
Microbial Treatment: Combines solid-liquid separation devices to treat feces and urine separately: feces are decomposed into carbon dioxide and water by microbial strains, while urine is filtered and disinfected into reclaimed water for reuse, forming a closed-loop ecological cycle of 'excreta-treatment-reuse', suitable for long-term use scenarios with strict environmental requirements.
Selection Basis: It is necessary to comprehensively consider the usage scenario (such as temporary events or long-term fixed use), foot traffic, water and electricity supply conditions, and environmental requirements. For example, dry packing or foam sealing types are preferred in water-scarce areas; biological treatment or recirculating water flushing types are suitable for venues with high foot traffic.
