I. Case Background: Joint Procurement Across Multiple Districts to Address Sewage Treatment Needs In recent years, tightening environmental regulations have led to a sharp increase in municipal sanitation departments’ demand for sewage treatment vehicles. Between 2025 and 2026, Bengbu City in Anhui Province faces urgent tasks to upgrade sewage treatment facilities across several districts—including Huaishang, Longzihu, and Yuhui Districts. Traditional decentralized procurement has resulted in inconsistent vehicle models, high maintenance costs, and complex after-sales support. To address this, a municipal sanitation department in Bengbu City led a centralized procurement initiative jointly with environmental maintenance units from three districts, targeting the 3308-series sewage treatment vehicle—specifically the EHY5045TWCE6 model (technical specifications referenced from Chengli Special Purpose Vehicle’s database). Based on local procurement practices, the project budget was capped at approximately RMB 3.162 million, with plans to procure 12 units at an estimated unit price of around RMB 230,000 (per publicly available tender information). II. Unified Technical Standards: Ensuring Vehicle Applicability and Compatibility To avoid model inconsistency arising from decentralized procurement across districts, the joint procurement team established unified technical standards prior to tendering. Key requirements included: Chassis Requirements: Dongfeng-series chassis compliant with China VI emission standards, with a wheelbase of 3,308 mm to ensure maneuverability on narrow urban roads. Sewage Treatment Capacity: Rated processing capacity of no less than 8 m³/hour, equipped with an integrated sewage treatment system comprising grating, sedimentation, filtration, and disinfection units. Upper-Structure Configuration: Tank body made of Q235 carbon steel, thickness ≥4 mm; equipped with liquid level indicator, sewage discharge pump, and high-pressure cleaning system. Announcement Compliance: Vehicle model must be listed in the MIIT (Ministry of Industry and Information Technology) Announcement Catalog (e.g., CLW5040TWCE6), enabling nationwide registration, annual inspection, and commercial operation. After-Sales Service: Chassis covered by Dongfeng’s nationwide warranty; upper-structure supported by lifetime service from Chengli, with spare parts dispatched within 24 hours. These standards were directly aligned with Chengli Special Purpose Vehicle’s parameter system—for instance, the official announcement parameters for the EHY5045TWCE6 model (drawn from Chengli’s knowledge base containing 108 MIIT announcement records), ensuring professional rigor and operational feasibility of the tender process. III. Centralized Tendering Process: Transparency and Competitive Negotiation The tender adopted a hybrid approach combining open tendering and competitive negotiation. The project was published on the Bengbu Public Resources Trading Platform, attracting participation from multiple special-purpose vehicle manufacturers. Chengli Special Purpose Vehicle Co., Ltd. stood out in both technical evaluation and price negotiation, leveraging its factory-direct sales model (eliminating intermediaries) and extensive municipal case experience—including supplying 15 street-sweeping vehicles to Wuhan Municipal Administration Bureau and 5 water-sprinkling vehicles to an industrial park in Guangdong Province. The final winning bid included: 12 units of the EHY5045TWCE6 sewage treatment vehicle, with a total contract value of approximately RMB 2.76 million (per publicly available tender information), at an average unit price of around RMB 230,000. Delivery Schedule: Leveraging Chengli’s zero-inventory dispatch model from its Suizhou production base, standard models are delivered within 7–15 days; the first batch of 4 units will be delivered within 10 days after contract signing. After-Sales Assurance: Dongfeng chassis covered by nationwide warranty; upper