Currently completed is the first phase of the project, covering an area of about 3.95 hectares, was completed and opened to the public in August 2008, with a treatment capacity of 50,000 m/d. Nanjing Xianlin Wastewater Treatment Plant adopts the CAST wastewater treatment process, which is characterized by a small footprint, compact facilities, dense equipment, and a high degree of automation.
Nanjing Xianlin Wastewater Treatment Plant has three functional departments, namely, Production Section, Equipment Section and Office, as well as five front-line production and operation teams, including Center Control Room, Laboratory, Operation and Maintenance Class, Jiuxianghe Pumping Station Management Class and Xianlin Avenue Pumping Station Management Class, with more than 70% of the plant's employees having university degrees or above.
Modern sewage treatment technology. According to the degree of treatment, it can be divided into primary, secondary and tertiary treatment.
Primary treatment
The main removal of solid pollutants in the sewage in a suspended state, the physical treatment method can only be completed in most of the requirements of primary treatment. After primary treatment of sewage, BOD can generally remove about 30%, not up to the discharge standards, primary treatment is a pretreatment of secondary treatment.
Secondary treatment
The main removal of sewage in the colloidal and dissolved organic pollutants (BOD, COD substances), the removal rate of up to 90% or more, so that organic pollutants to meet the discharge standards.
Tertiary treatment
Further treatment of difficult to degrade organic matter. Nitrogen and phosphorus and other soluble inorganic substances that can lead to eutrophication of water bodies, etc.. The main methods are biological nitrogen and phosphorus removal, coagulation and precipitation, sand rate method, activated carbon adsorption, ion exchange method and electroosmosis analysis. The whole process is through the coarse grid deletion of raw sewage through the sewage lifting pump upgrading, through the grid deletion or sieve rate device, and then into the sand sedimentation tank, after sand and water separation of sewage into the initial sedimentation tank, the above for the first level of treatment (i.e., physical treatment), the effluent of the initial sedimentation tank into the biological treatment equipment, there are activated sludge and biofilm method (of which the activated sludge method of the reactor has aeration tank, oxidation ditch, etc., the biofilm method includes) Biofilter, Bio-turntable, Bio-contact oxidation and Bio-fluidized bed). The effluent of the biological treatment equipment into the secondary sedimentation tank, the effluent of the secondary sedimentation tank after disinfection discharge or into the tertiary treatment, the end of the primary treatment to this for the secondary treatment.
Tertiary treatment includes biological nitrogen and phosphorus removal. Coagulation and precipitation. Sand filtration, activated carbon adsorption, ion exchange and electrodialysis, part of the sludge from the secondary sedimentation tank is returned to the primary sedimentation tank or biological treatment equipment, part of it enters the sludge thickening tank, and then it enters the sludge digesting tank, and after dewatering and drying equipment, the sludge is finally utilized.