Government Procurement Case and Bid-Winning Solution Analysis of the National VI Dongfeng 3308-mm Wheelbase Sewage Treatment Vehicle in Huanggang City In Huanggang City, Hubei Province, rising demands for urban-rural environmental governance have created urgent needs for upgrading sewage treatment infrastructure across multiple districts and counties. Conventional fixed sewage treatment plants involve lengthy construction periods and substantial capital investment; by contrast, mobile sewage treatment vehicles—due to their flexibility, maneuverability, and rapid response capabilities—have become the preferred solution for addressing decentralized sewage treatment challenges. This article uses a real-world case of multi-district joint procurement of National VI Dongfeng 3308-mm wheelbase sewage treatment vehicles in Huanggang as its basis, providing an in-depth analysis of the entire process—from needs assessment and technical standard formulation to centralized tendering and bulk delivery—and incorporates supply experience from Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli') to serve as a reference for similar procurement projects. I. Background: Drivers Behind Multi-District Joint Procurement Huanggang City administers numerous districts and counties—including, for example, the Urban Management Bureau of a certain district and the environmental maintenance unit of a particular subdistrict—all facing similar challenges: incomplete sewage networks in older residential communities, industrial parks, or temporary gathering sites result in direct discharge of domestic and industrial wastewater. Procuring sewage treatment vehicles individually not only fragments budgets and weakens bargaining power but also complicates post-purchase operation, maintenance, and spare parts management. Accordingly, following coordination by higher-level authorities, multiple districts and counties decided to conduct joint procurement—leveraging 'economies of scale' to reduce costs while ensuring consistent technical specifications across all units. According to publicly available tender information, the total budget for this joint procurement was capped between approximately RMB 4.253 million and RMB 4.20 million, with plans to acquire eight National VI-compliant sewage treatment vehicles at unit prices ranging from about RMB 450,000 to RMB 520,000. The procuring entity explicitly stipulated the following requirements: the chassis must be a National VI-compliant Dongfeng model with a 3308-mm wheelbase, ensuring vehicle maneuverability and stability on urban-rural roads; the superstructure must incorporate core functions including self-priming suction, solid-liquid separation, and disinfection treatment, with a minimum treatment capacity of 10 m³/hour. II. Development of Unified Technical Specifications To ensure procured equipment meets practical operational requirements, the procuring entity convened an expert team that referenced official Ministry of Industry and Information Technology (MIIT) announcement parameters (e.g., Chengli’s CLW5070GSSD6 model) to formulate unified technical specifications. Key requirements include: Chassis Requirements: National VI-compliant Dongfeng chassis with 3308-mm wheelbase, equipped with Yunnan Internal Combustion Engine or Yuchai engine, output power ≥95 kW, compliant with National VIb emission standards. Sewage Tank: Constructed from Q235 carbon steel or stainless steel, effective volume ≥5 m³, tank wall thickness ≥4 mm, with anti-corrosion coating. Treatment System: Equipped with high-capacity vacuum pump, self-priming depth ≥6 meters, treatment capacity ≥10 m³/h; integrated solid-liquid separator with separation efficiency ≥90%. Disinfection Module: Fitted with either ultraviolet (UV) disinfection unit or sodium hypochlorite dosing system, ensuring effluent complies with Grade A standards per the 'Emission Standards of Pollutants for Urban Sewage Treatment Plants' (GB