Mobile Toilet and Septic Tank Installation

The installation of a mobile toilet and septic tank must follow standardized procedures. The specific steps are as follows:

I. Preliminary Preparation

1. Confirm Installation Location: Choose an area with higher elevation and smooth drainage, approximately 1.5 meters away from the main body of the mobile toilet, to avoid water accumulation or blockage. Avoid underground pipelines, tree roots, and other obstacles to ensure construction safety.
2. Check Tools and Materials: Prepare tools such as shovels, tape measures, spirit levels, and wrenches. Verify that PVC pipes, elbows, sealing rings, anti-backflow valves, and other accessories match in specifications and are free from damage or aging.
3. Communicate with Property Management or Relevant Departments: Notify them of the construction plan in advance to avoid damaging existing pipelines, greenery, or affecting the surrounding environment, ensuring compliance with local planning requirements.

II. Septic Tank Excavation and Positioning

1. Excavate the Foundation Pit: Determine the depth according to the model (usually 1.2 meters), with a diameter 20 centimeters larger than the main body of the septic tank. For rural toilet renovations, the foundation pit depth for an integrated three-chamber plastic septic tank must be ≥1.2 meters.
2. Bottom Treatment: Lay a 10-centimeter-thick gravel bedding layer and compact it to ensure flatness; in rural areas, pour a 10-centimeter-thick cement bedding layer, level it, and let it cure for 24 hours.
3. Horizontal Positioning: Use a spirit level to calibrate the height of the septic tank's inlet and outlet, ensuring alignment with ground pipelines to avoid future drainage issues.

III. Septic Tank Installation and Pipeline Connection

1. Place the Septic Tank: Steadily place the septic tank into the foundation pit, adjust its position to the center, and maintain a horizontal state.
2. Connect Inlet and Outlet Pipes: Align PVC pipes with the septic tank's inlet and outlet, seal them with sealing rings, and then fix them with glue; for rural toilet renovations, add sealing gaskets to ensure overlapping joints prevent leakage.
3. Install Anti-odor and Sewage Transfer Pipes: Install anti-backflow valves at pipeline connections; connect the chambers with sewage transfer pipes, using dedicated fittings to fix them in an inverted L-shape with the front lower and the rear higher, with openings in the middle-lower part of the front chamber and the middle-upper part of the rear chamber.
4. Install Vent Pipes: Reserve a vent pipe with a diameter of 10 centimeters and a length of 2 meters, run it up along the wall and extend it above the toilet building, with a rain cap installed at the end.

IV. Sealing and Backfilling

1. Sealing Treatment: Apply waterproof glue to the internal and external connections of the septic tank (such as pipeline joints and cover gaps) to prevent sewage leakage.
2. Layered Backfilling: First, backfill gravel to 5 centimeters above the pipeline, then compact layers of yellow soil (each layer ≤30 centimeters thick) to avoid settlement; for rural toilet renovations, compact while backfilling until level with the ground.

V. Installation and Commissioning of Supporting Facilities

1. Install Inspection Wells: Set up inspection wells on the top of the septic tank or at key pipeline nodes for easy future cleaning and maintenance.
2. Water Injection and Drainage Test: After backfilling, fill the septic tank with water to two-thirds of its capacity and observe for 24 hours for leakage; open the inlet valve to check if drainage is smooth and repair any leakage points.

VI. Precautions

1. Regular Maintenance: Check pipeline sealing every quarter and clean sediments to avoid blockage.
2. Winter Frost Protection: Wrap insulation cotton around the pipelines to prevent freezing and cracking.
3. Compliant Discharge: Ensure connected pipelines comply with local environmental protection standards and prohibit direct sewage discharge.