Gate to Gate
Identity ID
e5d9c27a-1215-45b5-b6d0-16affb620842
Process class
Associated ID
bdaf87f5-f18f-4d16-94b8-41e6c7f34d41
Included activities starts
Included activities ends
Description
The process first sets up a fine screen as the initial step of wastewater treatment to remove larger suspended solids and floating materials from the wastewater, thereby protecting downstream treatment units from damage. Subsequently, a balancing tank is used to stabilize the flow rate and quality of the wastewater, ensuring stable conditions for the following treatment stages. During this phase, the pH and temperature of the wastewater may also be adjusted.
Next, in the hydrolysis and acidification tank, organic matter in the wastewater is hydrolyzed and acidified under anaerobic conditions, converting it into a form more amenable to biodegradation, thus preparing the wastewater for subsequent aerobic treatment. The A/O (anaerobic/aerobic) biological treatment tank is the core unit of the treatment process. By controlling oxygen supply, it promotes microbial growth to achieve the degradation of organic matter and removal of nitrogen and phosphorus. This process includes nitrification and denitrification, as well as phosphorus uptake and release. Following this, advanced treatment is carried out: the rotary disk filter further removes suspended solids through physical filtration, improving the clarity of the effluent. Catalytic ozonation utilizes the strong oxidizing property of ozone to decompose refractory organic compounds and enhance water quality. The aerated biological filter further degrades organic matter under aerobic conditions, while also removing nitrogen and phosphorus. Ultrafiltration membranes use membrane separation technology to remove micro-particles and dissolved contaminants from water. Finally, reverse osmosis (RO) membranes further purify the water by removing dissolved salts and organic substances, ensuring the effluent quality meets high standards. Prior to discharge, sodium hypochlorite is used for disinfection to eliminate bacteria and viruses in the water, ensuring the safety of the effluent.
Activity Description
The wastewater treatment process described includes: a pretreatment stage involving fine screens and equalization tanks to remove large suspended solids and regulate water quality and flow; a biological treatment stage using an acidification-hydrolysis tank and an A/O (anaerobic/oxic) biological reactor to degrade organic matter and achieve nitrogen and phosphorus removal through microbial metabolism; and an advanced treatment stage that further removes suspended solids, dissolved pollutants, and bacteria through technologies such as disk filtration, ozone catalytic oxidation, biological aerated filtration, ultrafiltration membranes, and reverse osmosis (RO), ensuring the effluent meets Level A requirements of the 'Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants'.
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 the treatment of wastewater with specific technologies in the WWTP.