Gate to Gate
Identity ID
dcfe4856-6a17-463f-8e21-ed9790ea3cc7
Process class
Associated ID
0695be78-d0a6-4414-ae00-55162f4584d3
Included activities starts
Included activities ends
Description
This process first undergoes pretreatment to remove large suspended solids, sand, and gravel from the wastewater, protecting the proper operation of subsequent treatment facilities. Then, the MBBR (Moving Bed Biofilm Reactor) treatment is applied, which combines the advantages of conventional activated sludge processes and biofilm methods. In the MBBR tank, microorganisms attach to specially designed bio-carriers, forming a biofilm. As wastewater passes through these carriers, organic matter is degraded by microorganisms, thereby achieving water purification. Catalytic ozonation is an advanced oxidation technology that employs the strong oxidizing properties of ozone, under the action of a catalyst, to deeply treat non-biodegradable organic compounds in wastewater. Nitrification and denitrification are key processes in biological nitrogen removal, consisting of two main steps: nitrification and denitrification. During the nitrification stage, ammonia nitrogen is oxidized to nitrate by nitrifying bacteria under aerobic conditions. In the denitrification stage, nitrate is reduced to nitrogen gas by denitrifying bacteria under anoxic conditions, thereby removing nitrogen from wastewater. Sodium hypochlorite disinfection is the final stage of wastewater treatment, aimed at inactivating pathogenic microorganisms in the wastewater to ensure the sanitary safety of the effluent. Sodium hypochlorite decomposes in water to form hypochlorous acid, which has strong oxidizing properties and can effectively kill bacteria, viruses, and other microorganisms. Disinfected wastewater meets the Class A standard of the "Pollutant Discharge Standard for Municipal Wastewater Treatment Plants" (GB18918-2002) and can be safely discharged or used for ecological forest irrigation.
Activity Description
The wastewater treatment process begins with a pretreatment stage, using screens and grit chambers to remove suspended solids and large particulate impurities from the wastewater. Next, the wastewater enters the MBBR (Moving Bed Biofilm Reactor) biochemical stage, where biofilm technology decomposes organic matter under anoxic and aerobic conditions and achieves nitrogen removal. Subsequently, catalytic ozonation utilizes the strong oxidizing ability of ozone to further break down refractory organic compounds. Following this, through nitrification and denitrification processes, microorganisms convert ammonia nitrogen into nitrate and ultimately reduce it to nitrogen gas, achieving nitrogen removal from the wastewater. Finally, sodium hypochlorite disinfection is applied to disinfect the treated effluent, ensuring the water quality meets safety standards.
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