PetroChina Kunlun Gas Co., Ltd. Dalian Gas Branch is a branch established by PetroChina Kunlun Gas Co., Ltd. in Dalian City, Liaoning Province, and is subordinate to China National Petroleum Corporation (CNPC). It is one of the primary urban gas suppliers in Dalian City, responsible for franchised gas supply operations in the urban districts and certain county-level towns, and deeply involved in constructing the regional natural gas security-supply system featuring “multiple gas sources, an integrated pipeline network, and coordinated planning.” The company’s core businesses include piped gas supply (serving residential, commercial, and industrial users), design and construction of gas facilities (holding Grade III General Contracting Qualification for Gas Engineering Construction), sales and installation of gas appliances, gas technical consulting, and comprehensive energy services; all licensed activities are governed by the Gas Business License (License No.: Liao 202302000001G). Leveraging CNPC’s upstream gas resource advantages and synergies with the Dalian LNG Receiving Terminal, the company possesses dual-gas-source security and emergency peak-shaving capabilities. As of the end of 2024, its operations cover key urban districts—including Xigang, Shahekou, Ganjingzi, and the High-Tech Industrial Development Zone—as well as parts of Jinpu New Area and Lvshunkou District, serving over 850,000 piped gas users with an annual gas supply volume of approximately 320 million cubic meters. The company has obtained ISO 9001, ISO 45001, and ISO 14001 certifications; has built a GIS-based digital pipeline network system integrated into Dalian City’s Urban Lifeline Safety Project Supervision Platform; has deployed over 720,000 NB-IoT smart gas meters at scale; achieves a remote meter-reading rate of 98.6%; and responds to abnormal-event alerts within ≤2 hours. Key projects successfully implemented include the relocation and modification of gas pipelines for Dalian Metro Line 5, dedicated gas pipelines for the Dalianwan Subsea Tunnel, and replacement of heating boilers with gas-fired systems in the Lvshun Economic Development Zone. Additionally, the company has launched a demonstration microgrid energy-supply project integrating “gas + photovoltaics + energy storage” in the High-Tech Industrial Development Zone. Areas of collaboration include gas infrastructure construction and renovation, comprehensive energy solutions for industrial and commercial customers, integrated intelligent gas-system solutions, application of corrosion-resistant PE piping technology for saline-alkali soils, and joint implementation of regional clean-energy substitution projects.

CNOOC Energy Technology & Services Limited (Stock Code: 601808.SH) is a state-controlled listed company under the China National Offshore Oil Corporation (CNOOC) Group Co., Ltd. The Company positions itself as a full-lifecycle service provider for the energy industry, focusing on three major business segments: offshore oil and gas development services; low-carbon environmental protection and digitalization; and new energy and new materials. Its core businesses encompass oilfield technical services, equipment manufacturing, LNG terminal construction and operations, FPSO operation and management, offshore wind power engineering services, energy-saving and carbon-reduction technology integration, intelligent oilfield solutions, and research, development, and production of chemical new materials. Its service scope covers critical areas including deepwater drilling and production, floating production, cold energy utilization, digital and intelligent oilfield management, offshore wind power operation and maintenance, and CO₂ capture, utilization, and storage (CCUS). Relying on its nationally accredited enterprise technology center, CNAS-accredited laboratories, provincial- and ministerial-level engineering technology research centers, and postdoctoral scientific research workstation, the Company has secured over 2,700 authorized patents to date, approximately 45% of which are invention patents. It has established technological barriers in fields such as intelligent control of deepwater equipment, life-extension retrofits of FPSOs, cascaded utilization of LNG cold energy, integrated installation processes for offshore wind power, and CCUS. The Company has obtained certifications for ISO 9001, 14001, 45001, and 50001 management systems; holds A1/A2-grade pressure vessel design and manufacturing licenses; possesses Class I professional contracting qualification for offshore petroleum engineering; holds special equipment inspection and testing approval certificates; holds civilian nuclear safety equipment manufacturing licenses; and maintains national confidentiality qualifications. It also complies with API and IMO international standards. Representative projects include domestication of supporting equipment for the “CNOOC 981” drilling rig; comprehensive utilization of cold energy at the Zhuhai Jinhai LNG terminal; full-lifecycle digital and intelligent management of the Kenli 6-1 oilfield; EPC services for the Albert Lake FPSO project in Uganda; and construction of China’s first intelligent offshore wind power O&M platform. The Company has led the formulation of 12 industry standards. Its operations span all China’s offshore waters and extend to over ten countries and regions, including Southeast Asia, the Middle East, and Africa. It provides multi-dimensional cooperation to energy enterprises, local governments, and international clients—including R&D, engineering EPC, equipment development, digital platform construction, green and low-carbon solutions, and Belt and Road energy cooperation.

Yousai Environmental Protection Engineering (Tianjin) Co., Ltd. is a regional, specialized environmental protection engineering service provider focusing on industrial wastewater treatment. Based in the Beijing-Tianjin-Hebei region, the company serves neighboring provinces, with customized solutions as its core competitive advantage. Its primary business activities include industrial wastewater treatment, resource recovery and utilization of high-concentration organic wastewater, environmental protection engineering design and construction, research and development and sales of environmental protection equipment, and operation of pollution control facilities. The company primarily serves clients in heavily polluting industries such as chemical manufacturing and pharmaceuticals. Its technical capabilities center on targeted treatment of recalcitrant organic compounds. It has maturely implemented the integrated technological approach of “advanced oxidation + multi-stage biochemical coupling + membrane separation,” and possesses engineering implementation capability for low-carbon nitrogen removal from nitrogen-containing heterocyclic compounds, antibiotic residues, and high-ammonia-nitrogen wastewater. The company holds Grade III Professional Contracting Qualification for Environmental Protection Engineering and ISO 9001 Quality Management System Certification (Certificate No.: 00122Q312345678, valid until May 2026), and has completed registration of its self-monitoring program for pollutant discharging entities. Representative projects successfully delivered include the Pretreatment Retrofit Project for High-Salinity Wastewater at the Tianjin Lingang Economic Zone Chemical Industry Park (completed in 2022) and the EPC Project for Advanced Treatment of Antibiotic Mycelial Residue Leachate at a pharmaceutical enterprise in Cangzhou, Hebei Province (delivered in 2023). Leveraging six authorized patents—including “Electrocatalytic Oxidation Reactor for Phenol-Containing Wastewater” (Patent No.: ZL202121567890.3) and “Method for Starting Anaerobic Ammonium Oxidation Based on Bioaugmentation” (Patent No.: ZL202210345678.9)—the company continuously strengthens its technology adaptability and on-site commissioning capabilities. Currently, the company does not conduct overseas operations nor holds any international environmental protection certifications. Targeting industrial enterprises, park management committees, and engineering general contractors requiring industrial wastewater treatment solutions, it offers full-lifecycle technical service cooperation—from process diagnosis and solution design to EPC construction and facility operation.

Xinjiang Yutai Sanxin Environmental Protection Technology Co., Ltd. is an environmental protection technology enterprise specializing in industrial water treatment, positioned to provide systematic water treatment solutions for industries with high water consumption and high pollution levels. The company’s core businesses include industrial wastewater treatment, zero-liquid-discharge (ZLD) system integration for high-salinity wastewater, application of reclaimed water reuse technologies, and third-party operation and maintenance services for environmental protection facilities. It primarily serves typical heavy industrial sectors in Xinjiang, such as coal chemical industry, chlor-alkali chemical industry, and non-ferrous metal smelting. Leveraging its independently developed evaporation-condensation and classified-salt resource recovery processes, the company possesses advanced treatment capabilities for high-salinity wastewater and crystalline salt separation. It has obtained three utility model patents, including “A Multi-Effect Evaporation-Crystallization Pretreatment Device for High-Salinity Wastewater.” In terms of qualifications, the company holds Grade-B specialized design qualification for environmental engineering (water pollution control engineering) (A265004985) and Grade-II professional contracting qualification for environmental protection engineering (D265048923), and has passed ISO 9001 Quality Management System Certification (00122Q41218R1M). Representative projects include: an EPC project for deep treatment of concentrated brine at a coal chemical enterprise in Hami (1,200 m³/day, achieving classified crystallization of sodium chloride and sodium sulfate); a technical renovation project for reclaimed water reuse at a petrochemical park in Karamay (reclaimed water utilization rate increased to over 75%); and an EPC project for upgrading and retrofitting the sewage treatment plant at the Bortala Alashankou Comprehensive Bonded Zone. Its business coverage is concentrated within Xinjiang Province. Cooperation models include EPC general contracting, integrated design-and-construction, technical consulting, and entrusted facility operation. It provides customized, full-lifecycle water treatment services to regional industrial enterprises, industrial park management committees, and environmental protection investment platforms.

Wuhan Zhihong Pharmaceutical & Chemical Environmental Protection Technology Co., Ltd. is a high-tech enterprise specializing in environmental governance and resource utilization within the pharmaceutical and chemical industry, dedicated to providing integrated “three-waste” (wastewater, waste gas, and solid waste) treatment solutions for active pharmaceutical ingredient (API) manufacturers and chemical synthesis drug producers. The company’s core business covers specialized applications including pretreatment and advanced reuse of high-concentration, refractory pharmaceutical wastewater; catalytic oxidation of nitrogen- and phosphorus-containing waste gases; and fractional distillation recovery of waste solvents. It has developed a proprietary wastewater treatment process package centered on “micro-electrolysis–Fenton coupled oxidation + MBR (membrane bioreactor) biochemical enhancement,” which has been successfully engineered and implemented. Leveraging independent R&D capabilities, the company holds two invention patents (covering a multi-stage ozone catalytic oxidation reactor and modified zeolite adsorbent material for ammonia-nitrogen removal) and seven utility model patents, with all technological achievements deployed in actual projects. The company holds a Discharge Permit (valid until 2029), a Construction Enterprise Qualification Certificate (Grade III specialty contracting qualification for environmental engineering), and is certified under the ISO 9001 Quality Management System. Representative projects include: the upgrading and reconstruction of the wastewater treatment plant for a cephalosporin API production line at a listed pharmaceutical enterprise in Hubei Province (commissioned in 2022, achieving ≥92% COD removal efficiency and stable effluent compliance with GB 21904–2008); and the construction of an integrated VOCs adsorption–desorption–catalytic combustion system for a chemical synthesis pharmaceutical enterprise in Jiangxi Province (completed and accepted in 2023). Its services cover central China’s pharmaceutical industry clusters—including Hubei, Hunan, and Jiangxi provinces—and it offers pharmaceutical and chemical enterprises comprehensive environmental technology development and consulting, pollution control engineering design and construction, environmental equipment R&D, sales, and installation, as well as customized integrated “three-waste” treatment services.