On October 8, 2022, the second phase of ZhangGuizhuang Sewage Treatment Plant, invested and operated by China Railway Construction Development Group and constructed with the participation of China Railway 14th Bureau, officially started construction. This project is the largest single sewage treatment plant project implemented by the "TOT+BOT" mode in the domestic municipal field since 2020. It is the first stock sewage treatment project operated by the PPP model in Tianjin, and the first unicipal sewage treatment plant integrated with investment, construction and operation of China Railway Construction.

hangguizhuang Sewage Treatment Plant project

The Zhangguizhuang Sewage treatment plant project is the first large-scale water control project for Tianjin in 39 years since China Railway Construction Co., Ltd. diverted Luanuan to Tianjin. The project is located in Dongli District, Tianjin, with a total investment of 3 billion yuan, covering an area of 45 hectares.

Construction of the project, the relevant units will be in accordance with the concept of green water ecology and water ecological wisdom and a livelihood project of zero pollution, make sewage water, to ensure the safety of public water, actively boost the tianjin difference in planning part of the river to realize "water fish grass" development goals, power play water the key of the first world war battle.

The sewage treatment plant is a well-known large user of electricity. How to change the water plant from a large user of electricity to a master of power generation is a new article made by the Railway Construction Company in actively practicing the "double carbon" strategy. A 6MW photovoltaic power plant with advanced dual-wave photovoltaic modules will be built simultaneously at the water plant. The photovoltaic power plant can generate more than 6 million KWH per year, in addition to the supply of electricity for the sewage treatment plant itself, the surplus electricity can also be surplus electricity online, enrich the local power supply, and then promote ZhangGuizhuang sewage treatment plant on a green and low-carbon road to a resource-saving water plant.

Zhangguizhuang sewage treatment plant biochemical sedimentation tank

In the second phase of construction, ZhangGuizhuang Sewage Treatment Plant will take the lead in introducing the "smart water" system based on big data, Internet, cloud computing and other technologies independently designed and developed by China Railway Construction Corporation. While improving the operation efficiency of the water plant, it will cover the production operation, equipment management, inspection management and other key work of the sewage treatment plant. Digital operation records, precise management instructions, scientific operation decisions, mobile office and management are realized, and powerful technical support is provided for energy saving and consumption reduction, staff reduction and efficiency improvement and fine management of enterprises.

Zhang Guizhuang first phase of the sewage treatment plant from July 25, 2021, by the development of railway construction officially took over after the operation, they rely on "multi-stage OA biochemical reaction tank + efficient sedimentation tank + denitrifying deep bed filter" as the core of the depth of denitrification and phosphorus removal technology for safe steady operation for 440 days, and comprehensive processing residents more than 20, ten thousand tons of sewage each day, Turning it into recyclable reclaimed water not only ensures the ecological environment safety of Dongli District and even Tianjin, but also plays an important role in improving the utilization rate of local water resources.

At present, THE SLUDGE disposal system with a scale of 300 tons is designed in the first phase of ZhangGuizhuang Sewage treatment Plant, which adopts the combination of dynamic and static tank sludge aerobic fermentation treatment and can be directly used in landscaping. Optimize the maintenance of high energy consumption equipment in detail, which can reduce the equipment consumption and pharmaceutical consumption. In 2021, the main pharmaceutical production in the factory saves 11% on average, and the main electricity saves 8% on average. Realize the sludge "reduction, stabilization, harmless, resource", but also realize the sewage treatment, sludge disposal and urban development of the closed cycle. Editor/He Yuting