Gate to Gate
Identity ID
60cfcd44-a47f-4bb8-9e63-22c06df03b54
Process class
Associated ID
cd91dbe4-46b6-4328-a228-4b8c586b7cc7
Included activities starts
Included activities ends
Description
In this process, during the flocculation and sedimentation stage, flocculants are added to aggregate suspended solids and colloidal particles in the wastewater into larger flocs, which are then removed by gravitational settling in a sedimentation tank, effectively eliminating suspended solids and some colloidal substances from the wastewater. This step is crucial for reducing the loading on subsequent treatment processes and also helps improve the overall efficiency of the wastewater treatment system. As a complement to flocculation and sedimentation, dissolved air flotation (DAF) introduces numerous fine air bubbles into the wastewater, using the buoyancy of the bubbles to lift pollutants attached to them to the surface, forming a scum layer, which is subsequently removed by a skimmer. This process can not only effectively remove oil and grease and fine suspended solids from wastewater, but also further reduce the turbidity of the wastewater, creating better conditions for subsequent biological treatment. The hydrolysis and acidification tank is a crucial part of anaerobic treatment, where microorganisms break down complex organic compounds into simpler, low-molecular-weight organic substances through metabolic activities, while converting part of the organic matter into biogas, thus achieving preliminary degradation of organic pollutants. This process not only enhances the biodegradability of the wastewater, but also provides favorable conditions for subsequent aerobic biological treatment. The CASS process is the core of the entire sewage treatment system. By simulating the natural biological degradation processes, it enables efficient removal of organic matter, nitrogen elimination, and phosphorus uptake. In the CASS tank, wastewater undergoes cycles of organic matter degradation, nitrification and denitrification of ammonia nitrogen, and phosphorus absorption, under alternating aerobic, anoxic, and anaerobic conditions. This cyclic treatment approach not only improves the efficiency of wastewater treatment but also helps reduce sludge production, thereby lowering the costs associated with subsequent sludge treatment.
Activity Description
The wastewater treatment process includes: first, removing suspended solids and some colloidal substances from wastewater through a flocculation sedimentation tank; then, an air flotation tank further separates oils and fine suspended particles. Subsequently, the wastewater enters a hydrolysis acidification tank, where refractory organic compounds are converted into biodegradable substances under anaerobic conditions. Finally, in the CASS tank, organic matter degradation, nitrogen removal, and phosphorus uptake are achieved through periodic aerobic and anoxic environments, thereby accomplishing the goal of water quality purification.
Process Description
Wastewater treatment services typically include four main aspects: pretreatment, primary treatment, secondary treatment, and tertiary treatment, ensuring the stable operation of the wastewater treatment system and compliance of the effluent water quality with regulatory standards.
Time period
2022
2026
Geography
China
Macroeconomic value
Business-as-Usual
Data validation
Yes
Technology
Current Technology
Technology comment
This activity represents wastewater treatment with specific technologies in a WWT plant