中国水环境集团
What did the Underground WWTP Admired by Vice Premier Han Zheng Look Like?
2019-03-05 On Feb. 25, 2019, Han Zheng, member of the Standing Committee of the Political Bureau of the CPC Central Committee and Vice Premier of the State Council, paid a visit to the Dali Bai Autonomous Prefecture, where he put a particular focus of inspection on the protection and management of Erhai Lake and visited CWEG’s Shuanglang Underground WWTP. CWEG Yunnan
Li Ganjie, Minister of Ecology and Environment, Lu Hao, Minister of Natural Resources, Zhang Yong, Deputy Head of the National Development and Reform Commission, Liu Wei, Deputy Minister of Finance, Chen Hao, Secretary of the CPC Yunnan Provincial Committee, and Ruan Chengfa, Governor of Yunnan, accompanied the delegation on the inspection.
It is common knowledge that the traditional WWTP built above the ground features high land occupation and energy consumption, emanating noise and odor that seriously affect the surrounding areas. Residents oppose building a WWTP in their local area, despite it is a must-have of modern cities, known as the Not in My Backyard Phenomenon (NIMBY).
The underground WWTP provides the solution to the conflict. The fully-enclosed underground WWT innovatively proposed by CWEG is divided into three levels. The two underground levels are respectively the operation & facility level and the treatment level, leaving the above-ground area for building parks, science museums, tourism facilities and etc., in a bid to combine water environment management and green development organically.
II. Core Technology
1. Elimination of odor and noise
Actually, the fully enclosed underground WWTP has higher requirements on noise and odor removal than above-ground ones. Relying on the HERO™ (High Efficiency Removal of Odor) Composite Biological Odor Removal Process independently developed by CWEG, the group’s underground WWTP boasts the top 1 whether in terms of treatment capacity or effluent quality, eradicating noise and odor pollution, and minimizing the environment footprint. So far, the technology has been successfully deployed in Beijing, Shanghai, Hong Kong and other places.
2. Intelligent and unmanned WWTP operation
The application of the Smart WWTP & Environmental Internet-of-Things system allows orderly and unmanned operation of treatment facility in the underground WWTP, enabling online watershed monitoring and precaution with intelligent real-time analysis.
3. Effluent achieving Surface Water Quality Standard Class IV
Thanks to CWEG’s advanced technology, the effluent quality of the underground WWTP can achieve Surface Water Quality Standard Class IV, far higher than that of traditional WWTPs (Class IA).
4. Recycling of tail water
The “sponge farmland” system independently developed by CWEG uses the lift station to pump effluent to the ecological pond, through which the quality of treated effluent can achieve Surface Water Quality Standard Class II-III, for agricultural irrigation and urban landscaping. The system effectively reduces 20 million m3 of water pumped from the Erhai Lake for agricultural irrigation, leading to high resource utilization.
5. Increasing the value of above-ground land
What is the greatest value of an underground WWTP? Due to the acceleration of urbanization, residential buildings and commercial districts are springing up in waves, making land a scarce resource. The underground WWTP helps save land by innovatively developing the above-ground land for high-quality zero-emission ecological hotels, special restaurants, accommodation facilities, entertainment centers, and other integrated development projects (e.g. 200-km-long bike transfer stations that surround the Erhai Lake, charging piles, parking lots, self-driving tour sites, and tourist service centers), thus bolstering the value of land. In this way, the underground WWTP is turned into a “positive asset” of the city from a “negative asset”, which greatly improves the efficiency of investment and enables the integration of water environment management and green development.
Li Ganjie, Minister of Ecology and Environment, Lu Hao, Minister of Natural Resources, Zhang Yong, Deputy Head of the National Development and Reform Commission, Liu Wei, Deputy Minister of Finance, Chen Hao, Secretary of the CPC Yunnan Provincial Committee, and Ruan Chengfa, Governor of Yunnan, accompanied the delegation on the inspection.
The Dali Shuanglang Underground WWTP of CWEG
An aerial photograph of the Shuanglang Underground WWTP
CWEG Yunnan Division General Manager Meng Jianwei reported to Han Zheng on the progress of the wastewater interception project
(Photo/CCTV NEWS)
Deeply impressed by the technology and treatment capacity of the Shuanglang Underground WWTP as part of the Dali Erhai Lake wastewater Interception PPP Project, Han Zheng gave the WWTP credit for achievements made in curbing the degradation of water quality. He stressed that the focus should be put on wastewater interception and treatment, promoting wastewater recycling across the whole river watershed, strengthening wastewater treatment and sewer pipe maintenance, and continuously reducing the pollution load to the lake, thereby promoting the protection and management of Erhai Lake.
A picture of the effluent of the Shuanglang Underground WWTP (Photo/CCTV NEWS)
I. Underground WWTPA picture of the effluent of the Shuanglang Underground WWTP (Photo/CCTV NEWS)
Overview of the Dali Erhai Lake wastewater Interception PPP Demonstration Project (Phase I)
The Dali Erhai Lake wastewater Interception PPP Demonstration Project (Phase I) plays a key part in the protection of the Erhai Lake, involving the construction of 6 underground WWTPs (phase I treatment capacity of 54,000 tons/day), 231-km-long sewer pipes and 12 pumping stations. Compared with traditional above-ground WWTPs, the underground WWTP is superior in saving approx. 160 mu of land and reducing the contaminated land by approx. 2000 mu. Thanks to CWEG""s progressive technology, the total planned investment of the project, which is estimated to be RMB 3.49 billion, has decreased by RMB 600 million, and the project was completed 6 months ahead of schedule. Also, measures have been taken to speed up the project as per the requirements at the provincial, prefecture and municipal levels. The project is listed as one of the second batch of PPP demonstration projects of the Ministry of Finance.
The Dali Erhai Lake wastewater Interception PPP Demonstration Project (Phase I) plays a key part in the protection of the Erhai Lake, involving the construction of 6 underground WWTPs (phase I treatment capacity of 54,000 tons/day), 231-km-long sewer pipes and 12 pumping stations. Compared with traditional above-ground WWTPs, the underground WWTP is superior in saving approx. 160 mu of land and reducing the contaminated land by approx. 2000 mu. Thanks to CWEG""s progressive technology, the total planned investment of the project, which is estimated to be RMB 3.49 billion, has decreased by RMB 600 million, and the project was completed 6 months ahead of schedule. Also, measures have been taken to speed up the project as per the requirements at the provincial, prefecture and municipal levels. The project is listed as one of the second batch of PPP demonstration projects of the Ministry of Finance.
It is common knowledge that the traditional WWTP built above the ground features high land occupation and energy consumption, emanating noise and odor that seriously affect the surrounding areas. Residents oppose building a WWTP in their local area, despite it is a must-have of modern cities, known as the Not in My Backyard Phenomenon (NIMBY).
The underground WWTP provides the solution to the conflict. The fully-enclosed underground WWT innovatively proposed by CWEG is divided into three levels. The two underground levels are respectively the operation & facility level and the treatment level, leaving the above-ground area for building parks, science museums, tourism facilities and etc., in a bid to combine water environment management and green development organically.
II. Core Technology
1. Elimination of odor and noise
Actually, the fully enclosed underground WWTP has higher requirements on noise and odor removal than above-ground ones. Relying on the HERO™ (High Efficiency Removal of Odor) Composite Biological Odor Removal Process independently developed by CWEG, the group’s underground WWTP boasts the top 1 whether in terms of treatment capacity or effluent quality, eradicating noise and odor pollution, and minimizing the environment footprint. So far, the technology has been successfully deployed in Beijing, Shanghai, Hong Kong and other places.
2. Intelligent and unmanned WWTP operation
The application of the Smart WWTP & Environmental Internet-of-Things system allows orderly and unmanned operation of treatment facility in the underground WWTP, enabling online watershed monitoring and precaution with intelligent real-time analysis.
3. Effluent achieving Surface Water Quality Standard Class IV
Thanks to CWEG’s advanced technology, the effluent quality of the underground WWTP can achieve Surface Water Quality Standard Class IV, far higher than that of traditional WWTPs (Class IA).
4. Recycling of tail water
The “sponge farmland” system independently developed by CWEG uses the lift station to pump effluent to the ecological pond, through which the quality of treated effluent can achieve Surface Water Quality Standard Class II-III, for agricultural irrigation and urban landscaping. The system effectively reduces 20 million m3 of water pumped from the Erhai Lake for agricultural irrigation, leading to high resource utilization.
5. Increasing the value of above-ground land
What is the greatest value of an underground WWTP? Due to the acceleration of urbanization, residential buildings and commercial districts are springing up in waves, making land a scarce resource. The underground WWTP helps save land by innovatively developing the above-ground land for high-quality zero-emission ecological hotels, special restaurants, accommodation facilities, entertainment centers, and other integrated development projects (e.g. 200-km-long bike transfer stations that surround the Erhai Lake, charging piles, parking lots, self-driving tour sites, and tourist service centers), thus bolstering the value of land. In this way, the underground WWTP is turned into a “positive asset” of the city from a “negative asset”, which greatly improves the efficiency of investment and enables the integration of water environment management and green development.
The most picturesque WWTP hidden under the park in China
Pictures of the Shanghai Jiading District Nanxiang Underground WWTP
