Cleaning Mobile Toilet Wastewater

The cleaning of mobile toilet wastewater primarily relies on chemical, biological, physical, and special process treatment technologies. It is necessary to select appropriate methods based on the characteristics of the wastewater and pay attention to maintenance and management.

I. Core Treatment Technologies

1. Chemical Treatment Method
   By adding chemical agents such as flocculants and disinfectants, suspended solids in the sewage are precipitated, organic matter is decomposed, or pathogens are inactivated. For example, the combined chemical and biological process can effectively remove organic matter and pathogens, enabling the effluent to meet direct discharge standards. Chemicals such as chlorine gas and sodium hydroxide can accelerate the separation of waste from water, reducing odors and harmful gas emissions. It is important to control the amount of chemicals used to avoid soil pollution.

2. Biological Treatment Method
   Microorganisms are utilized to decompose organic matter, commonly found in integrated sewage treatment equipment. For example, the A²O+MBR process combines a biological reactor with membrane filtration, with a daily treatment capacity of up to 200m³, suitable for high-concentration sewage and easy to operate. The biological treatment system typically consists of a fermentation tank and a filter. Excrement is decomposed by microorganisms and then enters the filtration stage for further water purification. Regular cleaning of the reactor and filter is required to prevent a decrease in microbial activity.

3. Physical Sedimentation Method
   Through equipment such as inclined tube sedimentation tanks, suspended solids are settled by gravity. For example, an inclined tube sedimentation tank has a treatment capacity of 1000m³/d and a sedimentation time of about 70 minutes, suitable for low-concentration sewage such as washing wastewater. This method needs to be used in conjunction with other processes, as its treatment effect is limited when used alone.

4. Special Process Treatment

   • Dry Packing Type: Excrement is collected by biodegradable plastic bags, automatically replaced after use, and collected centrally. It is then transported to a treatment plant for composting or incineration to achieve harmless disposal.
   • Foam Sealing Type: Foaming liquid is used to cover the inside of the toilet, replacing flushing water. Sewage mixed with foam enters a collection tank and is periodically pumped for treatment, reducing water consumption.
   • Microbial Type: Excrement is separated into feces and urine through a solid-liquid separation device. Feces are mixed with wood chips and biological strains for fermentation, decomposing into CO₂ and H₂O. Urine is treated through aeration and evaporation processes to become reclaimed water, which is used to flush the urinal again, forming a cycle.

II. Key Considerations

1. Regular Maintenance: Septic tanks need to be cleaned regularly to avoid blockages. Biological treatment equipment requires timely cleaning of the reactor and filter to ensure microbial activity.
2. Environmental Adaptation: In cold regions, anti-freezing measures such as equipment heating or adding insulation layers should be taken to prevent pipeline freezing and cracking.
3. Disinfection Requirements: Special scenarios such as medical sewage require enhanced disinfection, using efficient disinfectants such as ozone or sodium hypochlorite.
4. Classification Treatment: Select processes based on the type of excrement to avoid excessive use of chemicals leading to soil or water pollution.