Quanzhou’s EHY5045TWCE6 3.308 Wastewater Treatment Vehicle Government Procurement Case: In-depth Analysis of Energy-Saving Retrofitting and Winning Bid Solutions Amid the China VI Emission Standard Transition. Against the backdrop of the nationwide full implementation of the China VI emission standard in 2026, southern coastal cities such as Quanzhou—characterized by hot-humid climate and frequent rainy-season operations—impose higher performance requirements on sanitation equipment. A municipal sanitation department (hereinafter referred to as 'the client') recently procured a batch of 3.308 wastewater treatment vehicles, model EHY5045TWCE6, via public tender, with Chengli Special Purpose Vehicle Co., Ltd. winning the bid and delivering the units. This article takes this case as a starting point to comprehensively analyze the China VI transition policy, the phased retirement schedule for older vehicles, Chengli’s China VI-compliant solution, and how subsidy policies can be leveraged to optimize procurement costs—while also highlighting key equipment selection criteria tailored to southern China’s hot-humid environment. I. Policy Background of the China VI Transition and Phased Retirement Schedule for Older Vehicles According to the Ministry of Ecology and Environment’s 'Notice on Implementing the National Sixth-Stage Motor Vehicle Pollutant Emission Standards', the China VIb emission standard has been fully enforced nationwide since July 1, 2023. This means all newly registered sanitation vehicles must comply with the China VIb standard. Eastern coastal cities like Quanzhou enforce the policy more strictly, and local governments have introduced corresponding scrappage subsidy programs to accelerate the phase-out of vehicles meeting China III or lower emission standards. Based on publicly available information, the approximate retirement timeline for older vehicles is as follows: • By end-2023: All diesel-powered sanitation vehicles meeting China III or lower emission standards shall be scrapped; some cities offer subsidies of approximately RMB 10,000–30,000 per vehicle (subject to local procurement practice). • By end-2025: China IV vehicles will be progressively restricted from entering core urban districts; certain areas have already implemented driving restrictions. • Target for 2028: Proportion of new-energy and China VI-compliant vehicles to reach over 80%. The 3.308 wastewater treatment vehicles procured by the client are intended specifically to replace aging, high-emission vacuum sewage trucks, thereby fulfilling updated environmental compliance requirements. II. Chengli’s China VI Solution: Technical Breakdown of Model EHY5045TWCE6 Chengli Special Purpose Vehicle Co., Ltd. submitted the EHY5045TWCE6 wastewater treatment vehicle—built on a Dongfeng chassis—for this tender. The vehicle complies with the China VIb emission standard, features chassis model EQ1045SJ16DC, and is equipped with either Yuchai or Yunnei powertrain engines, delivering a rated power output of approximately 70–85 kW—suitable for both low-speed urban operations and high-speed inter-site transfers. Key technical specifications of this model (per MIIT announcements and Chengli’s product database) are listed below: Parameter Value/Description Notes Chassis Model EQ1045SJ16DC Dongfeng series Engine Emission Standard China VIb Complies with latest regulatory requirements Wastewater Tank Capacity Approx. 3.3 m³ Effective usable volume Suction Depth ≥ 8 meters Suitable for municipal sewer networks Maximum Suction Distance ≥ 50 meters Horizontal conveyance capability Anti-Corrosion Coating Epoxy primer + polyurethane topcoat for entire vehicle; critical components galvanized Specifically engineered for southern China’s hot-humid environment Sealing Material Oil-resistant, acid/alkali-resistant nitrile rubber (NBR) composite seals Enhanced durability under hot-humid conditions Overall Dimensions Length