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2026-09-10The Nanjing Municipal Government General Office recently officially issued the "Nanjing 15th Five-Year Plan for Water Affairs Development," specifying the implementation of pipeline network interconnection and repair projects in areas such as Chengbei, Chengnan, and Jiangxinzhou, the construction, renovation, and expansion of 4 industrial wastewater treatment plants and 5 domestic sewage treatment plants, and raising the urban reclaimed water utilization rate to 30%; 2026 年 will simultaneously implement 174 water affairs projects with an annual investment of 36.05 亿 yuan, as water environment governance moves from "quantitative accumulation" to "qualitative improvement."
I. Planning Objectives: 30% Reclaimed Water Utilization Rate + 90% Quality Improvement and Efficiency Enhancement Compliance Zones
2026 年 9 月, the Nanjing Municipal Government General Office issued the "Nanjing 15th Five-Year Plan for Water Affairs Development," placing water affairs work in a key position for the city's high-quality development during the 15th Five-Year Plan period. The plan specifies: by the end of the 15th Five-Year Plan, the coverage rate of quality improvement and efficiency enhancement compliance zones for sewage treatment in built-up areas shall reach 90%, basically achieving full collection and full treatment of sewage in built-up areas; the centralized collection rate of urban domestic sewage shall remain at 95%; the urban reclaimed water utilization rate shall be raised to 30%; and the proportion of national and provincial assessment sections with water quality of Grade III or better shall remain at 100%.
The plan also deploys the implementation of pipeline network interconnection and repair projects in areas such as Chengbei, Chengnan, and Jiangxinzhou, and the construction, renovation, and expansion of 4 industrial wastewater treatment plants and 5 domestic sewage treatment plants. This is a landmark plan that shifts from "large-scale new construction and capacity expansion" to "stock quality improvement and efficiency enhancement," and expands from "ensuring water quality" to "improving water ecology, optimizing waterfronts, and revitalizing water charm."
II. 2026 年 Project Matrix: 174 Projects, 36.05 亿 Yuan, 18 Category A
To achieve the 15th Five-Year Plan objectives, Nanjing 2026 年 will simultaneously implement 174 water affairs projects, covering national and provincial assessment section water quality compliance assurance, tributary treatment for rivers entering the Yangtze River, urban water body elimination of inferior water and quality improvement, creation of quality improvement and efficiency enhancement compliance zones for sewage treatment, the "squeezing out external water" special action, township sewage treatment tackling, demonstration construction of comprehensive water supply and drainage management, periodic pipeline network inspection and repair, and drainage facility operation and maintenance, with a total annual investment of 36.05 亿 yuan. Among them, the 18 Category A projects in the sewage facility construction field (13 continued projects and 5 new projects) are particularly critical.
Landmark projects include the Phase IV of Chengdong Wastewater Treatment Plant, the Phase II of Chengbei–Tiebei sewage collection system interconnection, the Jiangxinzhou sewage second channel, the renovation of Nanjing South Railway Station storage tank, and the new construction of No. 5 Street Ditch storage tank in Yuhuatai District, covering the entire sewage treatment chain—municipal pipeline network inspection and repair, sewage channel interconnection, wastewater treatment plant capacity expansion and upgrading, storage tank construction and renovation, and comprehensive river water environment governance.
III. Chengdong Plant Phase IV: Benchmarking Provincial Standard A, 45 万 tons/day Scale
The Phase IV project of Chengdong Wastewater Treatment Plant is the flagship project at the start of Nanjing's 15th Five-Year Plan. The project commenced on 2025 年 5 月 29 日, with an expansion scale of 10 万 tons/day and a total investment of approximately 4.0 亿 yuan. Upon completion, the total plant treatment scale will reach 45 万 tons/day. The project adopts a combined process of "multi-stage AO biochemical tank + micro-flocculation + homogeneous filter media filter," and the effluent quality implements Jiangsu Provincial local standard Standard A (DB32/4440-2022), the highest level in the province. The effluent from the existing Phase I, II, and III projects of Chengdong Plant has implemented Provincial Standard C since 2026 年 3 月 28 日, while Phase IV directly benchmarks Standard A. In terms of green and low-carbon aspects, the tailwater is 100% utilized.
The Phase IV project is entirely implemented within the existing plant site without adding a single inch of land—the land must be "squeezed" out by relocating sludge treatment facilities and demolishing old office buildings, while ensuring the existing production line of 35 万 tons/day operates without interruption. During construction, the team completed 8 sewage diversion and discharge operations of 10 万 tons/day or above. As of now, the project progress exceeds 80%, and it is planned to be completed by 2026 年 11 月.
IV. Jiangxinzhou Second Channel: 30 年 Old Channel Retired, Dual Channels Protecting 170 万 People
On 2026 年 5 月, the Jiangxinzhou sewage second channel was fully opened to water, enabling "dual-channel" operation for sewage from over 170 万 of the main city's population. The original old main channel of the Jiangxinzhou sewage system—the Yingtian Avenue 2.3 m × 2.8 m sewage box culvert and the 6.2 m outer diameter river-crossing shield tunnel—has been in existence for over 30 年, and has long been in a state of "overload operation, no backup channel, and no maintenance conditions."
The Phase II project has a total length of approximately 11.3 km. The section crossing the Jiajiang River adopts a shield tunnel with an outer diameter of 8.8 m, inside which 2 DN2200 pipes are installed for full-pressure flow conveyance. The sewage is collected at the Fengtai Road Pumping Station and pressurized in a single stage, then conveyed at high speed through closed pipelines to the Jiangxinzhou Wastewater Treatment Plant, with no intermediate pumping stations along the route. The new and old channels form a dual-channel configuration of "one in use, one on standby, mutually redundant," resolving the historical problem that the main channel could not be taken out of service for maintenance for over 30 years.
V. Impact on TIANYI TECH's Equipment and O&M Business
The Nanjing "15th Five-Year Plan" water affairs plan provides a complete roadmap for sewage treatment and reclaimed water utilization in a provincial capital city. TIANYI TECH can directly participate in the following four directions:
- New construction and upgrading of industrial wastewater treatment plants——The new construction and expansion of 4 industrial wastewater treatment plants correspond to the demand for pretreatment + advanced treatment + zero liquid discharge process packages. The company's membrane pretreatment, RO/NF, and MBR process combinations can be delivered as integrated solutions.
- Upgrading of domestic sewage treatment plants to Provincial Standard A——The multi-stage AO + micro-flocculation + filter process imposes new requirements for advanced nitrogen and phosphorus removal and energy conservation. The company's integrated solution of "process package + intelligent chemical dosing + online monitoring" can reduce energy consumption per ton of water.
- Storage tanks and pipeline network interconnection——Pipeline network interconnection and initial rainwater storage tanks generate continuous procurement demand for automatic control valves, water level monitoring, and intelligent scheduling. The company's automatic control system and SCADA platform are capable of direct integration.
- Reclaimed water utilization and tailwater reuse——The plan requires the urban reclaimed water utilization rate to be increased to 30%. The company's reclaimed water process packages (industrial circulating cooling, municipal miscellaneous use, ecological water replenishment) and O&M services will form a replicable model in Nanjing and surrounding areas.
Source: Jiangsu Provincial Department of Water Resources, "Nanjing: 'Water Beautifies Jinling,' Advancing from 'Having' to 'Excellent'" (2026-09-04), Nanjing Daily.
About TIANYI TECH Co., Ltd.
TIANYI TECH Co., Ltd. is an international water service provider specializing in the R&D of wastewater treatment and reclaimed water reuse equipment, engineering general contracting, and O&M services. Its business covers the full chain of scenarios including advanced industrial wastewater treatment and zero liquid discharge, centralized municipal and industrial park wastewater treatment, reclaimed water utilization, seawater desalination pretreatment, and sludge resource recovery. With "TIANYI LIMITED" as its unified brand identity, the company has established a strong presence in Southeast Asia, the Middle East, Africa, and other markets along the "Belt and Road," providing clients with full-cycle solutions from feasibility study, design, equipment manufacturing, installation and commissioning, to operational trusteeship.
