1. Product Introduction and Features

The materials used in this product are common PE plastic and special polymer materials, which have been modified to create a unique synthetic material. Septic tanks made from this material feature high strength, excellent toughness, outstanding corrosion resistance, superior sealing performance, zero leakage, excellent aging resistance, no odor, and freedom from flies. They can reduce fly populations by up to 100% and cut the incidence of intestinal infectious diseases by 76.1%. The fertilizer produced after fermentation in these septic tanks enhances soil fertility and helps prevent soil compaction. The product is lightweight and highly maneuverable, making it easy to transport quickly and facilitating rapid installation. It is widely suitable for use in newly constructed or renovated sanitary toilets in rural areas.

2. Structural Principle

This product consists of a squat toilet, an effluent pipe, a front chamber, a rear chamber, and related accessories. Fecal matter flows from the squat toilet into the front chamber (fermentation chamber) and then into the rear chamber (storage chamber). The front and rear chambers are connected by an effluent pipe, which is installed at a 45° angle. This design ensures that the effluent pipe slopes downward from front to back, creating a certain distance between the two chambers. The length of the effluent pipe connecting the two chambers is approximately 1 meter. When fecal matter is discharged into the fermentation chamber, solids settle at the bottom of the chamber for fermentation, while the fermented liquid flows through the effluent pipe into the rear storage chamber. Both chambers are equipped with lids, making them safe and convenient to use.

3. Process Flow Diagram for Septic Tank Production

(Figure 2: Process Flow Diagram)

(Figure 3: Production Site)

4. Installation Instructions

1) Dig a pit: Dig a rectangular toilet pit at the selected site (large enough to accommodate two cesspools).

2) Base preparation: First, compact the foundation, then lay bricks 10–15 cm thick at the bottom of the jar body to create a level surface.

3) Connecting the ceramic pots: Place the two sets of ceramic pots in the toilet pit, arranging them front-to-back. Seal the joint between the upper and lower pots with double-sided adhesive tape arranged in two rows on both sides. Be careful not to remove the protective layer from the top side of the adhesive tape. Also, thoroughly seal the joint area in the middle of the tape using sealant. Once the upper and lower pots are properly aligned, one person uses an electric drill to make holes along the edges of the pots, while another person inserts screws into the drilled holes (a total of 11 screw holes, including 4 for injecting sealant). Then, firmly tighten the screw caps—holding the screw cap with pliers and using the electric drill to tighten the other end, which saves time and effort.

4) Fixing the elbows: Use a specialized opening tool to drill a circular hole with a diameter of Φ110 at the pre-designed fixing location on the jar body. The front jar opening should be 55 cm above the ground, while the rear jar opening should be 115 cm above the ground. The horizontal outlet from the front jar opening should extend upward at a 30° angle and then enter horizontally into the rear jar opening. Screw in a specially designed PVC Φ110 or PP Φ110 threaded elbow equipped with a rubber gasket onto the drilled holes. (The elbow opening of the front jar should face upward, while the elbow opening of the rear jar should face downward.) Apply sealant around the contact area between the rubber gasket and the jar. The elbow, rubber gasket, and sealant together provide both waterproofing and secure fixation.

Connection of the fecal pipe: Directly place the ceramic chamber into the excavated pit, ensuring that the chamber rises 5–10 cm above ground level to prevent water seepage into the chamber. Adjust the position of the fecal pipe outlet so that the distance between the two elbows is 75 cm. Use a Φ110 PVC fecal pipe for connection, applying sealant to both ends of the pipe and ensuring that the angle of the fecal pipe exceeds 30 degrees. Approximately 15–20 cm from the front chamber opening, use an 110-cm hole cutter to create an opening as close to the top as possible. Connect this opening with an 110-cm sliding fecal pipe. Below the toilet, install an odor-proof device, which should be connected to the sliding fecal pipe and securely fastened to the front chamber. Finally, backfill the excavation area and compact the soil thoroughly. (Depending on site conditions, if there is no need to drill a hole in the front upper chamber to connect the toilet’s sliding fecal pipe, you may instead build a brick structure at the front chamber opening measuring 400 mm high, 300 mm wide, and 500 mm long. Then simply place the toilet on top of this structure.)

6) Backfilling: When backfilling with soil, use fine soil to fill around the jar body. Always ensure that the double-jar body remains in place. Each time you add 20 cm of soil, compact the backfilled soil thoroughly. Depending on the height of the jar body, compact the soil at least six times or more. After thoroughly compacting the backfilled soil, construct a wellhead using bricks at the top opening of the jar body and cover it with a lid to prevent people from accidentally stepping on the lid and causing it to break and fall in.