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[Photos and Text] Asia’s largest semi-underground wastewater treatment plant has been completed and put into operation in Tianjin.

2020-08-14

Recently, the wastewater treatment plant within the relocation and reconstruction project of the Tianjin Eastern Suburb Wastewater Treatment Plant and Reclaimed Water Plant has officially begun commercial operations, while the reclaimed water plant has entered the commissioning phase and is expected to be put into operation in September. At that time, this “super project” covering an area of 420,000 square meters... The daily wastewater treatment capacity will reach 600,000 tons, and the daily treated recycled water capacity will reach 100,000 tons. It will benefit four administrative districts and over 1.95 million residents, undertaking one-fifth of Tianjin’s wastewater treatment tasks and helping to improve the overall water quality in the Beijing-Tianjin-Hebei region.

Project Overview

The new site of the East Suburb Wastewater Treatment Plant is located within the wedge-shaped area northwest of the Beijing-Tianjin-Tanggu Expressway and the adjusted outer ring road. The total land area of the project is 422,300 square meters, and the estimated total investment is... 3.699 billion yuan; upon completion, the facility will have a daily sewage treatment capacity of 600,000 tons. The daily treatment capacity of reclaimed water is 100,000 tons, with a total service area of 14,370 hectares, benefiting Hongqiao District, Hebei District, Hedong District, and Dongli District, and serving a population of approximately 1.95 million people.

China Construction Installation No. 1 Company participated in the construction of all process equipment and electrical engineering for the biological pond, secondary settling tank, ozone contact tank, sludge treatment workshop, ultraviolet disinfection channel, and reclaimed water area of the wastewater treatment plant.

Guangzhou Weigu Environmental Protection Equipment Co., Ltd.

Just how big is Asia’s largest semi-underground wastewater treatment plant? The builders responded like this: The Dongjiao Wastewater Treatment Plant project is enormous in scale. As large as 60 football fields. 42,000 precast concrete piles, with a total length exceeding 600,000 meters—equivalent to the height of 68 Mount Everests; 1.47 million cubic meters of earth excavated, enough to fill 1.6 Water Cubes; a cumulative use of 90,000 tons of rebar, equivalent to the total steel usage of 2.5 National Stadiums—the "Bird's Nest"…

Above ground is a garden; below ground lies the universe.

Looking out into the distance, one sees lush green lawns, verdant walkways, charming pavilions, and brilliantly blooming flowers—yet who would ever guess that beneath our feet lies a massive wastewater treatment plant? sky The relocation project for the Jindong Suburban Wastewater Treatment Plant and Reclaimed Water Plant alone features underground excavation pits with an area equivalent to 24 standard soccer fields. To avoid disrupting the park’s landscape, the project adopts a semi-underground design. The above-ground portion includes spaces required for production and management activities as well as an ecological garden. All wastewater treatment equipment is located underground.

Guangzhou Weigu Environmental Protection Equipment Co., Ltd.

“Just like a desktop computer,” The display screen and other accessories are placed on the ground, while the main unit is buried underground. The primary equipment is submerged underground. It effectively addresses issues such as foul odors and noise generated during wastewater treatment, with minimal impact on residents and the environment. “Project manager Ren Zhanju said. The above-ground park also incorporates the ‘sponge city’ development concept, employing features such as grass swales, permeable paving, and rain gardens. Through gentle slopes and vertical greening designs, the plant is seamlessly integrated into the larger ecological park.”

Guangzhou Weigu Environmental Protection Equipment Co., Ltd.

How does the sewage, collected via the sewer network, complete its transformative journey from “turbid” to “clear”? The project team. Adopting a wastewater treatment process featuring “an improved multi-stage AO system + high-efficiency sedimentation tank + deep-bed filter + ozone oxidation + UV disinfection.” 。

Wastewater undergoes preliminary treatment for sludge removal and primary sedimentation. After microbial decomposition in the biological reactor, it is sequentially passed through a high-efficiency sedimentation tank and a deep-bed filter to remove particulate suspended solids. Subsequently, it is treated with an ozone system for odor removal and ultraviolet disinfection. The effluent quality can meet Tianjin’s local discharge standard Class A. Some of the treated effluent can be directly discharged into parks for use as landscape and wetland water.

The reclaimed water treatment employs a “ultrafiltration + reverse osmosis” process. The treated water can be reused in thermal power plants, chemical plants, and restrooms, truly achieving water resource recycling.

Adapt to local conditions and build “expressways.”

Underneath the ecological park, at a depth of 14 meters, the sewage conveyance network shoulders the critical responsibility of providing “one-stop sewage collection and transportation.” Traditionally, water treatment plant’s reservoirs were connected by surface and underground pipelines, allowing for transportation and construction using cranes.

After the civil engineering structure was sealed, the project team moved in to begin construction. All large-diameter pipelines had to be hoisted into the enclosure through the two pre-installed lifting openings. Due to the confined construction space and the fact that most of the pipe corridors were located at the bottom of the enclosed enclosure, individual pipelines could weigh over 10 tons each. As a result, cranes and heavy-duty trailers could not be used during transportation and installation. How to quickly transport the pipelines underground for installation thus became a major obstacle to the project’s construction progress.

Guangzhou Weigu Environmental Protection Equipment Co., Ltd.

The project team has innovatively developed a planar transportation technology for confined spaces, effectively creating a “subway” for pipeline transportation. Construction workers laid out transport tracks inside the container and used track-based trolleys to sequentially convey the pipelines to the lifting openings according to the weld joint layout diagram. Then, they employed a self-made gantry crane to lower the pipelines into the pipe gallery and transported them via the tracks to the designated construction sites for installation.

The successful application of this technology ensured the installation of 10,000 meters of pipeline, preventing damage to the anti-corrosion coating during transportation and ultimately enabling the timely completion of the project milestones.

Guangzhou Weigu Environmental Protection Equipment Co., Ltd.

Scientific policymaking for efficient “clearance”

The strength of an army lies not in its size but in its quality; the prowess of a commander lies not in his bravery but in his strategic acumen. At the project’s initial stage, there were only six management personnel tasked with overseeing the installation and commissioning of equipment, piping, and electrical systems across nearly 100,000 square meters. Given the project’s extensive construction area—much of which involved underground work—the project team adopted a regional responsibility system: each manager was assigned a specific area, and the “area chief” was responsible for everything from material procurement and inspection within their jurisdiction to subsequent system commissioning.

During the Spring Festival, to achieve the goal of formal energization and water-filled commissioning, the project team led more than 120 workers in conducting power-on tests and pipeline installation inspections at the sludge treatment workshop and seven 10-kV high-voltage switchgear rooms. Adopting a “two-shift” work schedule, the team compressed the originally scheduled 15-day task of testing and commissioning the high-voltage switchgear rooms into just three days.

Guangzhou Weigu Environmental Protection Equipment Co., Ltd.