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.

Liaoning Huafu Environmental Engineering Co., Ltd. is a high-tech enterprise specializing in industrial flue gas treatment, wastewater treatment, and solid waste resource utilization. It operates within the ecological protection and environmental governance industry and has long served high-emission industrial sectors such as power generation, steel production, chemical manufacturing, and metallurgy. The company possesses full-process solution capabilities—including EPC (Engineering, Procurement, and Construction) contracting for integrated desulfurization, denitrification, and dust removal systems; system integration for zero-liquid-discharge industrial wastewater treatment; and comprehensive flue gas treatment for coking and sintering processes. Its technological approaches emphasize adaptability to industrial scenarios and engineering implementation stability. Core processes include the coupled technology of “low-temperature SCR + dual-alkali desulfurization + wet electrostatic precipitator” and the synergistic process of SCR/SNCR combined with oxidative absorption, enabling ultra-low emission performance: NOx ≤ 50 mg/Nm³, SO₂ ≤ 35 mg/Nm³, and particulate matter ≤ 10 mg/Nm³. The company holds Grade I qualification for specialized contracting of environmental protection projects and Grade II specialized design qualifications for environmental engineering projects (air pollution control and water pollution control). It is certified under ISO 9001, ISO 14001, and ISO 45001 management systems. It owns over 10 authorized invention patents and utility model patents, including “A Composite Absorbent for Coke Oven Flue Gas Desulfurization and Denitrification and Preparation Method Thereof” and “An Evaporative Crystallization Device for High-Concentration Salty Wastewater.” Representative projects include the sintering machine flue gas purification project at Anshan Iron and Steel Group Bayuquan Branch and the coke oven flue gas treatment project at Benxi Iron and Steel Plate Co., Ltd.—both key industrial retrofit projects in Northeast China. Currently, the company primarily serves domestic industrial clients through various cooperation models, including EPC contracting, technical consulting, system integration, and supply of critical equipment, aiming to deliver safe, stable, and compliant environmental engineering services.

Dalian Petrochemical Engineering Co., Ltd., located in Ganjingzi District, Dalian City, Liaoning Province, is a state-owned specialized engineering technology service enterprise approved by the former Ministry of Chemical Industry and currently supervised by the State-owned Assets Supervision and Administration Commission of Dalian Municipal Government. The company has long focused on full-process engineering services in the petroleum, chemical, energy, and environmental protection sectors. It is categorized as an enterprise in the “high-end equipment manufacturing industry” and “integration of modern services,” both of which are prioritized for development by the Chinese government. The company possesses strong regional influence in niche areas including petrochemical engineering consulting and design, EPC general contracting, and intelligent operation & maintenance services. Its core business covers technical domains such as energy-saving optimization for fluid catalytic cracking units, highly efficient separation of sulfur-containing wastewater steam, and intelligent diagnostics for BOG compressor systems at LNG receiving terminals. Its service portfolio targets typical scenarios including large-scale integrated refining & petrochemical projects, supporting infrastructure for green petrochemical bases, and overseas refinery upgrading & retrofitting projects. Clients include key national projects such as PetroChina Liaoyang Petrochemical Company, Hengli Petrochemical (Dalian) Co., Ltd., and Wanhua Chemical Yantai Industrial Park. The company holds Class-A qualifications for engineering design in the chemical, petrochemical, and pharmaceutical industries; Class-A credit rating for engineering consulting firms (petrochemical category); Special Equipment Pressure Pipeline Design Licenses (Categories GA/GC); Class-II qualification for general contracting of petrochemical construction projects; and a Work Safety Production License. It is certified under the ISO 9001, ISO 14001, and ISO 45001 management systems, and completed its re-evaluation for the GB/T 19001–2016 standard in 2023. It hosts the Liaoning Provincial Enterprise Technology Center and has obtained 47 authorized patents (including 12 invention patents). It led the formulation of the Liaoning Provincial Local Standard “Guidelines for Construction of Intelligent Operation & Maintenance Platforms in Petrochemical Enterprises” and participated in drafting three industry standards, including “Design Code for Safety Instrumented Systems in Chemical Plants.” Over the past three years, the company has secured over RMB 2.86 billion in contract value for EPC and EPCM projects. Representative delivered projects include: the EPC general contracting of the wastewater treatment plant supporting the Dalian Xizhong Island Green Petrochemical Base (capacity: 45,000 tons/day); detailed design and complete supply of the flare system for Hengli Petrochemical’s Changxing Island Integrated Refining & Petrochemical Project; and process package localization adaptation and HAZOP analysis support for the Atirau Refinery in Kazakhstan. The company does not operate overseas subsidiaries but extends its technological services to Belt-and-Road Initiative countries—including Kazakhstan, Uzbekistan, and Vietnam—through cooperative partnerships with domestic general contractors. In 2024, international business revenue accounted for approximately 6.3% of total revenue. The company offers specialized technical services including technology licensing combined with engineering implementation, joint-bid participation, localized adaptation, and dedicated services such as HAZOP/LOPA analysis.

Dalian Kesen Environmental Engineering Co., Ltd. was established in 2003, with its registered address located in Ganjingzi District, Dalian City, Liaoning Province. It is a high-tech enterprise specializing in the implementation of industrial environmental protection projects and operation & maintenance (O&M) of environmental facilities. The company’s registered capital is RMB 10 million; it is currently active and operational. Its primary revenue sources at present include comprehensive VOCs (volatile organic compounds) control, flue gas desulfurization and denitrification, industrial exhaust gas treatment, and third-party O&M services for environmental protection facilities. It qualifies as a medium- or small-sized environmental technology service provider capable of delivering engineering projects within its regional market. The company’s core business covers typical industrial sectors such as petrochemicals, equipment manufacturing, shipbuilding and repair, and chemical industry parks. It primarily serves fine chemical plants, coal chemical auxiliary workshops, and large-scale energy bases where urgent VOCs emission control and environmental upgrading are required. Its key capabilities encompass the engineering application of hybrid technologies—specifically “zeolite rotor + RTO (Regenerative Thermal Oxidizer)” and “low-temperature plasma + photocatalysis”—specialized contracting for environmental engineering projects (Grade III qualification), full-process EPC (Engineering, Procurement, Construction) project management, and integrated retrofitting and long-term O&M services for complete RTO incineration systems. It delivers full-cycle project execution—from conceptual design, equipment selection, installation and commissioning, to five-year facility托管 (managed services). The company holds a Grade III qualification for specialized contracting of environmental engineering projects (Certificate No.: D321111905, valid until December 2026) and a Work Safety Production License (Liao JZ An Xu Zheng Zi [2020] No. 020182). It was certified as a National High-Tech Enterprise in 2018 (Certification No.: GR201821200127); however, as of March 2026, no record of renewal registration appears on the official National High-Tech Enterprise Certification and Management Network. Representative projects include: - The VOCs control EPC project for the cast steel workshop of Dalian Huarui Heavy Industry Co., Ltd. (2019; contract value approx. RMB 6.8 million); - Third-party O&M services for supporting environmental facilities at the Liaoning Hongyanhe Nuclear Power Station (2021–2024); and - The centralized RTO incineration system upgrade and retrofit project for a chemical industry park in Yingkou (2022). All projects are located in Northeast China, and clients are predominantly heavy industrial manufacturing enterprises.