Non-bottomed septic tank for sand and gravel ground

CN224411604UActive Publication Date: 2026-06-26中国水利水电第七工程局有限公司

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: 中国水利水电第七工程局有限公司
Filing Date: 2025-07-07
Publication Date: 2026-06-26

AI Technical Summary

Technical Problem

Traditional septic tanks are prone to settling and cracking on gravel foundations, leading to sewage backflow and groundwater pollution. Furthermore, rural areas lack sewage treatment facilities and face high operation and maintenance costs.

Method used

The septic tank adopts a bottomless structure, with the tank wall surrounding a gravel foundation. The inner side is equipped with an impermeable layer, and the outer side is equipped with a backfill layer. It is equipped with a multi-stage filtration layer, including a boulders layer, a sand filter layer, a crushed stone filter layer, and a pebble layer, utilizing the permeability of the gravel for natural filtration and biological decomposition.

Benefits of technology

It effectively prevents sewage leakage, avoids pollution, reduces operation and maintenance costs, is suitable for gravel foundations, and has a simple structure and high stability.

✦ Generated by Eureka AI based on patent content.

Smart Images

Figure CN224411604U_ABST

Patent Text Reader

Abstract

The application relates to a non-bottomed septic tank suitable for a sand-gravel foundation, which comprises a tank wall, which is arranged around the outer periphery of the foundation arranged at the bottom of the septic tank; an anti-seepage layer is arranged on the inner side of the tank wall, and a backfill layer is arranged on the outer side of the tank wall; a plurality of filtering layers are arranged on the surface of the foundation; and a manure inlet is arranged on one side of the tank wall and is communicated with a cavity above the plurality of filtering layers. The tank wall is arranged around the outer periphery of the sand-gravel foundation, and the anti-seepage layer and the backfill layer are arranged on the inner side and the outer side of the tank wall respectively, so that the anti-seepage effect is enhanced and the structural strength is enhanced. The plurality of filtering layers are sequentially arranged on the surface of the sand-gravel foundation, the collected manure water is filtered in multiple stages, and the manure water is naturally permeated and biologically decomposed by relying on the permeation characteristics of the sand-gravel or the sand-pebble, so that ecological treatment is realized. Meanwhile, the sand-gravel foundation replaces the concrete bottom plate, the cracking phenomenon of the concrete bottom plate is avoided, the manure water can be prevented from seeping to the surrounding soil and underground water, and pollution can be avoided.

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