Group 1 - The State Intellectual Property Office of China has granted a patent for a "wastewater treatment system" to China National Offshore Oil Corporation Chemical Co., Ltd. and China National Offshore Oil Corporation Hegang Coal Chemical Co., Ltd. The patent was announced with the authorization number CN223087715U, and the application date was August 2024 [1] - The wastewater treatment system includes a sequence of connected units: a biochemical unit, a reclaimed water unit, and an advanced oxidation unit. The biochemical unit consists of multiple connected biochemical treatment pools [1] - The reclaimed water unit features a series of connected ultrafiltration membrane devices and reverse osmosis membrane devices. The outlet of the biochemical unit connects to the inlet of the ultrafiltration device, and the reverse osmosis product water connects to the circulating water system [1] Group 2 - China National Offshore Oil Corporation Chemical Co., Ltd. was established in 2000, with a registered capital of 461 million RMB. The company has invested in 18 enterprises and participated in 2,959 bidding projects, holding 206 patents and 12 trademark registrations [2] - China National Offshore Oil Corporation Hegang Coal Chemical Co., Ltd. was founded in 2006, with a registered capital of 233.56 million RMB. The company has invested in 1 enterprise and participated in 1,378 bidding projects, holding 38 patents and 6 trademark registrations [2]

Group 1 - The core viewpoint of the articles highlights that Tongchuan City has been recognized for its effective water environment governance practices, which have been promoted nationally by the Ministry of Ecology and Environment [1][2] - In 2024, Tongchuan City aims to enhance water quality through systematic and scientific approaches, achieving a continuous four-year compliance with Class III surface water standards at the Shichuan River monitoring point [1] - The city has implemented five key work mechanisms including regular scheduling, joint inspections, forecasting and early warning, on-site supervision, and inter-departmental collaboration to improve water ecological environment [1] Group 2 - Tongchuan City has constructed several water conservation projects, including the Danyang and Mudan Garden rainwater storage and ecological restoration projects, and new reservoirs to maximize natural rainfall retention [2] - The city has established a joint prevention and control mechanism for sudden water pollution incidents with neighboring districts, supported by a real-time water quality monitoring network consisting of 10 stations [2] - A total of 40 kilometers of recycled water pipelines have been built to alleviate water resource shortages, with the Peach Qu Po Reservoir regularly supplying ecological water downstream [2]