Technical Types of Concrete Septic Tanks

Mud and water mixture

Traditional septic tanks have been in use for over a century, employing a technology that involves the contact between wastewater and sludge. The settled sludge undergoes digestion and degradation, producing biogas. The upward buoyancy of the biogas causes disturbance in the sludge, which facilitates a more thorough mixing of the sludge with the microbial community, aiding in digestion and degradation. However, as the bottom sludge rises with the biogas and the bubbles escape, the sludge re-deposits downwards, re-polluting the wastewater with this rising and settling sludge.

In contact with septic tank sewage and sludge

In a mixed technology model, to affect the sedimentation and effluent water quality of septic tanks, it is necessary to extend the wastewater detention time to improve the sedimentation effect and effluent water quality. The wastewater detention time is generally...12-24Hour.

Three-phase Separation

The Three-Phase Separation Septic Tank technology is an advancement based on traditional septic tanks, retaining the benefits of the mixed sludge and water in the septic tank, and adding...“Wastewater, Sludge, Digestion Gas”The three-phase separation technology involves installing a three-phase separation unit at the outlet of the septic tank, separating sludge, digester gas, and the wastewater treatment process. This prevents the interference of air floatation on the wastewater treatment. The sedimentation tank at the outlet is designed according to the standards of the horizontal sedimentation tank technology, with a wastewater sedimentation time2Within an hour.

Technical Comparison

The septic tank's capacity consists of wastewater volume and sludge volume, with the wastewater retention time in a three-phase separated septic tank.4-6Hour, as compared to the wastewater detention time in the sludge-mixed septic tank12-24The company has saved volume by reducing the wastewater detention time, which allows for storing more sludge.