Color Steel Mobile Toilet Drainage Installation

The installation of drainage for color-steel mobile toilets requires special attention to key aspects such as the independent setup of the drainage system, selection of treatment equipment, control of pipeline slope, and anti-seepage treatment of the septic tank. Here are the specific installation points:

1. Independent Design of the Drainage System
The drainage system of color-steel mobile toilets must be completely independent of the municipal sewer network, especially suitable for undeveloped areas or temporary sites in Hainan. Its core function is to achieve self-purification of sewage through internal circulation or local treatment, avoiding overloading the public sewer network. For example, a sunken fiberglass septic tank decomposes organic matter through multi-stage sedimentation and anaerobic fermentation, while a biodegradation device uses microorganisms to decompose excreta. Both can achieve on-site sewage treatment and reduce the need for external discharge.

2. Selection and Installation of Treatment Equipment

• Sunken Fiberglass Septic Tank: A pit must be excavated according to the required dimensions, with the depth usually determined by the equipment capacity and geological conditions. A 10-15 cm thick layer of sand and gravel should be laid at the bottom of the pit to ensure the equipment is placed horizontally. A maintenance opening should be reserved at the top of the septic tank for easy cleaning and maintenance later.
• Biodegradation Treatment Device: It needs to be connected to a power source (if electric) and ensure good ventilation to prevent microorganisms from dying due to lack of oxygen. A filter screen should be installed at the inlet of the device to prevent debris from clogging the pipes.

3. Pipeline Slope and Connection Specifications
The drainage pipes should maintain a slope of 1%-3% (i.e., a drop of 1-3 cm per meter), using gravity to allow sewage to flow naturally to the treatment equipment. Pipe connections should use special glue or hot-melt technology to ensure tightness and prevent leakage. If PVC pipes are used, 45° elbows should be installed at bends to reduce water flow resistance. The end of the pipes should extend above the inlet of the septic tank or biodegradation device to prevent sewage backflow.

4. Anti-Seepage Treatment of the Septic Tank
An anti-seepage membrane (such as HDPE geomembrane) with a thickness of no less than 1.5 mm should be laid around and at the bottom of the pit. The edges should be folded up by more than 30 cm and pressed tightly with sand and gravel. The seams of the anti-seepage membrane should be hot-melt welded to ensure no gaps. After the septic tank is installed, fine sand should be filled in the gap between the pit and the equipment to serve as both a buffer and anti-seepage measure.

5. Acceptance and Maintenance Points
After installation, a water flow test should be conducted to check if the pipes are unobstructed and the equipment is operating normally. Regularly clean the septic tank (every 3-6 months) or check the microbial activity of the biodegradation device to ensure treatment efficiency. If any damage to the anti-seepage membrane or pipe leakage is found, immediate repairs should be made to prevent soil and groundwater pollution.