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 Division General Manager Meng Jianwei, explained the technology adopted by the WWTP and the planning of above-ground area.
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
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)
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.
An aerial photograph of the Dali Shuanglang Underground WWTP
According to Han, the CPC Central Committee attaches great importance to the protection of the Erhai Lake, and General Secretary Xi Jinping has made important instructions in this regard repeatedly, saying that “We must protect the Erhai Lake”. Despite phased achievement having been made in curbing the deterioration of water quality of the Erhai Lake, the protection and management of Erhai Lake still has a long way to go. “To this end, first, we should study and implement President Xi’s thought of ecological civilization, and act urgently and arduously, fully realizing that the protection and management of Erhai Lake is a long-term, complicated and challenging task that requires patience and persistence; second, a long-term development plan aligned with the actual situation has to be formulated and implemented to allow for scientific and systematic management and high-level monitoring of the Erhai Lake, especially of the core sections; third, 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; fourth, the non-point source pollution must be controlled in an intensive way, and the industrial restructuring and upgrading of the planting and breeding sectors should also be accelerated; last but not the least, Party members and cadres should serve as a good role model, carry out mass work in a sound manner, put the River Chief Mechanism into practice at all levels, combat various challenges, and unswervingly win the battle of Erhai Lake protection and management,” said Han.
CWEG Yunnan Division General Manager Meng Jianwei explained the treatment technology and process adopted by the Shuanglang Underground WWTP to Han
As a professional water environment management platform under State Development & Investment Corp., Ltd. (SDIC), CWEG (China Water Environment Group) is responsible stewards for a portfolio of national demonstration projects in 19 provinces and cities across China, and is equipped with the high-standard patented underground WWTP system which boasts the top 1 underground treatment capacity in Asia and the world. The Dali Erhai Lake wastewater Interception PPP Demonstration Project (Phase I), which involves the construction of 6 underground WWTPs and 231 km of trunk sewers (channels), etc., once completed, will completely prevent the Erhai Lake from pollution caused by the discharge of industrial and domestic wastewater. The wastewater is treated at a nearby WWTP and tail water will go to the wetland for purification, to support urban landscaping and agricultural irrigation, enabling effective protection of the Erhai Lake and continued improvement of water quality. According to a source, the project actually saved c. RMB 600 million or 17.2% of investment, symbolizing a water pollution prevention and control battle focused on the protection and management of Erhai Lake, and earning the praise of the General Office of the State Council in late December, 2018. The project was also listed as one of the 130 typical practices discovered during the State Council’s fifth inspection.
Part of demonstration projects of CWEG
An aerial photograph of the Dali Shuanglang Underground WWTP