江苏南京：32座污水处理厂提标改造全面启动

Core Viewpoint - The city is enhancing wastewater treatment efficiency and effluent quality through the upgrade of 32 wastewater treatment plants, with significant projects underway at both the Chengdong and Chengbei plants [1][5]. Group 1: Chengdong Wastewater Treatment Plant - The Chengdong wastewater treatment plant, with a current capacity of 350,000 cubic meters per day, serves approximately 1.1 million people and is set to expand its capacity by 100,000 cubic meters per day to a total of 450,000 cubic meters per day [2][3]. - The upgrade will utilize advanced technologies to improve existing treatment processes, including a combination of aeration, biological treatment, and disinfection methods, aiming to meet the A standard of Jiangsu Province's wastewater discharge standards [3][4]. - The upgraded effluent will be used for various purposes, including river replenishment, irrigation, and ecological water supply in the surrounding areas [3]. Group 2: Chengbei Wastewater Treatment Plant - The Chengbei wastewater treatment plant is also undergoing rapid upgrades, focusing on key structures such as aeration tanks and disinfection facilities, with construction already underway [4]. - The project aims to minimize environmental impact by adopting an "in-situ non-disruptive" renovation approach, which will enhance nitrogen removal capabilities while changing the disinfection method from liquid chlorine to sodium hypochlorite [4]. Group 3: Regulatory Standards and Goals - Jiangsu Province's new wastewater discharge standards, effective from March 28, 2023, categorize treatment plants into four discharge standards (A, B, C, D) based on various criteria [5]. - Out of 62 existing wastewater treatment plants in Nanjing, 32 require upgrades to meet the new standards, with expected improvements in effluent quality post-upgrade [5]. - The city's wastewater treatment capacity is projected to increase from 2.83 million tons to 3.5 million tons per day during the 14th Five-Year Plan, with a rise in centralized collection rates from 69.44% in 2020 to 95% by 2024 [5].