Mud and water mixture
The traditional septic tank has a history of over a hundred years. Its technical approach involves the contact between wastewater and sludge. The deposited sludge undergoes digestion and degradation, producing biogas, carbon dioxide, and other digestate gases. The buoyant action of the digestate gases causes disturbance to the sludge, and this disturbance facilitates the mixing of the sludge with
The mixed biofilm is more thorough, aiding in digestion and degradation. However, the bottom sludge rises with the digestion gas, and after the bubbles escape, the sludge re-sediments downward, re-polluting the wastewater with these rising and settling sludges.
In the technical mode where sewage and sludge are mixed and contacted in septic tanks, the sedimentation and effluent water quality of the septic tanks are affected. To improve the sedimentation effect and effluent water quality, it is necessary to extend the sewage retention time, which is generally 12-24 hours.
Three-phase separation
The Three-Phase Separation Septic Tank Technology is an advancement on traditional septic tanks, retaining the benefits of the mixed sludge and water within. It introduces a three-phase separation technique for "wastewater, sludge, and digester gas." A three-phase separation unit is installed at the outlet of the septic tank, separating the sludge and digester gas from the wastewater treatment process.
Avoid interference from air floatation phenomena in wastewater treatment. The sedimentation tank at the effluent end 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 separated septic tank, the wastewater retention time is 4-6 hours, compared to 12-24 hours in a mixed sludge-water septic tank. By reducing the wastewater retention time, the effective volume is saved, which can store more wastewater.
Clay.
The function of a septic tank
A septic tank is a fundamental facility for sludge treatment, as well as a preliminary treatment facility for domestic wastewater, with its functions including:
1. Ensure the cleanliness of residential community environments, preventing the spread of domestic wastewater and pollutants.
2. Eliminate mosquito and fly eggs 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 like acids and alcohols, improving the subsequent wastewater treatment.
