Mud and water mixture
Traditional septic tanks have been in use for over a century. The technology involves a contact mode between wastewater and sludge, where settled sludge undergoes digestion and degradation to produce biogas, carbon dioxide, and other digestate gases. The buoyant action of the digestate gases creates disturbances in the sludge, which facilitates the interaction between the sludge and...
The mixed biofilm is more thorough, aiding in digestion and degradation. However, the sludge at the bottom rises with the digesting gas, and after the bubbles escape, the sludge settles back down, re-polluting the wastewater.
In the technical mode where septic tank wastewater and sludge come into contact and mix, the sedimentation and effluent water quality of the septic tank are affected. To improve the sedimentation effect and effluent water quality, the wastewater retention time needs to be extended, typically ranging from 12 to 24 hours.
Three-phase separation
The Three-Phase Separation Septic Tank Technology retains the advantages of sludge and water mixture in traditional septic tanks, while adding a three-phase separation technique for "wastewater, sludge, and digestible gas." It sets up a three-phase separation unit at the outlet end of the septic tank, separating sludge and digestible gas from the wastewater treatment process.
Avoid the interference of air floating phenomena on wastewater treatment. The sedimentation tank at the outlet conforms to the technical standards of horizontal sedimentation tanks, with a wastewater sedimentation time of 2 hours or less.
Technical Comparison
The septic tank volume consists of wastewater and sludge compartments. In a three-phase separation septic tank, the wastewater retention time is 4-6 hours, compared to 12-24 hours in a mud-water mixed septic tank. By reducing the wastewater retention time, the effective volume saved can store more wastewater.
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The function of a septic tank
Septic tanks are fundamental facilities for sludge treatment and also serve as pre-treatment facilities for domestic wastewater, their functions include:
1. Ensure the cleanliness of residential community environments, preventing the spread of domestic wastewater and pollutants.
2. Eliminate mosquito and fly larvae in the anaerobic digestion environment of septic tanks.
3. Temporary storage of sludge, anaerobic digestion of organic sludge, matured organic sludge can be used as agricultural fertilizer.
4. Pretreatment of domestic wastewater (primary treatment), sedimentation of impurities, and hydrolysis of macromolecular organic matter into smaller organic molecules such as acids and alcohols, to improve subsequent wastewater treatment.
