Leakproof HDPE Biogas Septic Tank with Biogas Recovery for Underground Apartment Sewage Treatment

Our leakproof HDPE biogas septic tank is an integrated underground facility for sewage purification and biogas recovery, developed to solve decentralized sewage treatment demands of apartment blocks and dense residential compounds where municipal sewer access is unavailable or insufficient. Constructed from high-density polyethylene via one-piece rotational molding, this buried unit combines staged anaerobic digestion, solid-liquid separation and biogas collection, delivering an eco-friendly, resource-recycling wastewater treatment option for multi-family residential projects.

This tank features a host of prominent advantages. Its seamless rotomolded monolithic structure eliminates joints and welding gaps, achieving excellent leakproof performance to prevent sewage infiltration into surrounding soil and groundwater, as well as blocking unpleasant odour leakage.

• Superior durability: Premium HDPE material endows the tank with strong resistance against acid, alkali, sewage corrosion and ageing, maintaining stable performance under long-term underground burial.
• Efficient anaerobic treatment: The scientific multi-chamber internal layout enables graded anaerobic fermentation, which efficiently breaks down organic pollutants in domestic sewage while capturing biogas generated during sludge decomposition for reuse as clean fuel.
• Flexible scalability: Modular connection allows multiple tanks to be combined to scale up capacity, matching the sewage volume generated by different sizes of apartment blocks.
• Lightweight and easy to install: Compared with traditional concrete septic tanks, it is lightweight and easy to transport. The on-site installation process skips concrete pouring and curing work, shortening construction schedules and lowering labour costs.
• High compressive strength: Reinforced ribbed tank walls boost compressive strength to withstand backfill earth pressure reliably.

• Durable, simple construction, fast and convenient installation.
• Convenient storage and transportation.
• Good permeability and small footprint.
• High compressive strength and long service life.

• Inquiry and consulting support within 24 hours.
• Sample testing support.
• Factory visits, training on how to install the septic tank, and training on how to use it.
• Online support for impact resistance and compressive performance.

Handling community sewage and pollutants, the tank kills mosquito eggs in the anaerobic and decay working environment of the septic tank. It provides temporary storage of sludge and organic sludge for anaerobic decay, and mature organic sludge can be used as agricultural fertilizer.

Three-chamber septic tanks are widely used for domestic sewage treatment projects, residential communities, office buildings, hotels, schools, hospitals, barracks, public toilets, drainage treatment of food processing enterprises, residential buildings and other places requiring domestic sewage treatment.

Food-grade raw materials are integrally formed by rotational molding, making the tank non-toxic, environmentally friendly and not easy to break. The reinforcing rib design of the barrel body improves impact resistance and prevents deformation. The separator has good compression resistance, strong bearing capacity, acid and alkali resistance, anti-corrosion properties and a long service life.

The three-compartment septic tank is composed of three connected ponds with a fecal hole in the middle. It mainly uses anaerobic fermentation. The proportion of feces and parasite eggs in the middle layer is larger than that of the general mixed liquid and is easy to settle. Through fermentation and decomposition over time, the middle layer of fecal liquid flows from pool 1 to pool 3 to achieve the purpose of precipitation or killing parasite eggs and bacteria in the feces, and the fecal liquid in the third pool becomes an excellent fertilizer.

Supplied by Guangdong Wanquan Construction Technology Co., Ltd., this product covers extensive application scenarios. It is well suited for mid-rise apartment blocks, large residential compounds, staff dormitory quarters, serviced apartment zones, suburban concentrated residential areas and rural centralized apartment housing. It is also a viable option for supporting sewage treatment in supporting residential zones of scenic spots and industrial parks. When paired with our rainwater storage tanks, drainage channels and inspection wells, it can form a complete sponge city water management system for the whole residential site.

We implement rigorous full-process quality inspection from raw material screening to finished product leak testing. Our technical team provides site survey, capacity calculation, customized layout design and on-site installation guidance. Timely after-sales support is available to resolve operational concerns. For developers, contractors and distributors, this leakproof HDPE septic tank is a reliable sustainable solution. Partner with Guangdong Wanquan Construction Technology Co., Ltd. to secure stable, leak-free sewage treatment and biogas recycling facilities for your apartment projects.

Our plastic septic tank consists of three pools which are connected with the middle by soil pipe unicom, mainly by anaerobic fermentation.

The company specializes in the design of various injection molding products and mold production. We undertake the processing of various injection molding products, with a weight range of 0.5 kg to 70 kg, and a complete range of large and small injection molding machines. Existing production includes septic tanks, small purification tanks and rainwater modules.

The company's core business is to provide customers with a full range of comprehensive environmental governance services such as R&D, design, manufacturing, installation, commissioning and operation, and to tailor-make solutions for each customer to completely solve environmental problems such as landfill leachate treatment. With the enterprise spirit of "focus, professionalism, intention and innovation", Vantra has built a brand of environmental protection precision equipment, based on the national industry, and served China's environmental protection.