Case Study and Solution Analysis of the Xuchang Dongfeng D6 Sewage Treatment Vehicle (Blue License Plate) for Government Procurement In recent years, sewage treatment vehicles have gained increasing attention from grassroots municipal units as critical equipment for emergency response and routine maintenance in urban environmental governance. A municipal sanitation department in Xuchang (hereinafter referred to as the 'procuring entity') launched a bulk procurement project for blue license plate sewage treatment vehicles to address temporary sewage treatment needs in local rivers, ditches, and residential areas. After multiple rounds of evaluation and on-site inspections, five Dongfeng D6 blue license plate sewage treatment vehicles manufactured by Chengli Special Purpose Vehicle Co., Ltd. were delivered, with the total budget controlled at approximately RMB 1.222 million (based on publicly available tender information). This article provides a detailed analysis of this representative case from four perspectives: project background, vehicle selection rationale, winning solution, and FAQs. I. Project Background and Requirements Analysis The procuring entity operates in a typical Central Plains city where rapid urbanization has outpaced infrastructure development—particularly in older residential communities and peri-urban areas—resulting in incomplete coverage of sewage pipeline networks. During rainy seasons or pipe blockages, frequent sewage overflows and black-and-odorous river conditions occur. Conventional vacuum trucks only perform basic suction and transport operations; they cannot treat wastewater on-site, and their transportation-based approach incurs high costs and low efficiency. Therefore, the procuring entity urgently required an integrated vehicle capable of 'suction–solid/liquid separation–discharge' operations. Moreover, due to height and width restrictions on urban roads, a blue license plate vehicle (operable with a Class C1 driver’s license and unrestricted for city entry) was mandatory. Per the procurement documents (referencing publicly available tender information), key requirements included: - Gross vehicle weight ≤ 4.5 tons, operable with a Class C1 driver’s license; - Solid/liquid separation capability for sewage, with treatment capacity ≥ 10 m³/h; - Integrated discharge pump and high-pressure cleaning system; - Chassis from a reputable, mature brand to ensure after-sales support; - Unit budget capped between RMB 222,000 and 278,000. II. Vehicle Selection Rationale: Why the Dongfeng D6 Chassis Paired with Chengli Bodywork? After comparing chassis options from Foton, Jiefang, and others, the procuring entity selected the Dongfeng D6 chassis for the following reasons: Regulatory Compliance: The Chengli-manufactured Dongfeng D6 sewage treatment vehicle (model CLW5070GSSD6 and related variants) is listed in the MIIT’s Vehicle Announcement Catalog, enabling nationwide registration, annual inspection, and road transport permit issuance—ensuring zero policy-related barriers. Dimensional Advantages: With a wheelbase of 3,308 mm and overall dimensions of approximately 5,995 × 1,980 × 2,850 mm, the Dongfeng D6 fully complies with blue license plate standards, is operable with a Class C1 license, and easily navigates urban height-restricted routes. Powertrain Compatibility: Equipped with either the Quanchai Q23-115E60 or Yunnan YN D20TCIF1 engine, it meets China VI emission standards and delivers power output ranging from 85 kW to 93 kW—sufficient for demanding operational conditions. After-Sales Network: Dongfeng chassis offer nationwide warranty coverage, while Chengli bodywork provides lifetime after-sales service and guarantees 24-hour direct shipment of spare parts—effectively addressing grassroots users’ primary concern: 'fear of breakdowns and repair delays.' III. Key Insights into the Winning Solution Chengli Special Purpose Vehicle Co., Ltd. developed a customized solution aligned precisely wi