Government Procurement Case and Bid-Winning Solution Analysis for the National VI Dongfeng 3308 mm Wheelbase Sewage Treatment Vehicle in Yichang — In autumn 2025, a municipal sanitation department in a district of Yichang City (hereinafter referred to as the 'Purchasing Party') planned to procure a National VI emission-standard sewage treatment vehicle due to aging pipeline renovation in old residential communities and emergency sewage discharge requirements. After one month of internal research, model comparison, on-site inspections, and public tendering, Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli Automobile') was selected with its Dongfeng 3308 mm wheelbase sewage treatment vehicle solution. Based on this real-world case, this article reconstructs the decision-making logic and key steps involved in the government procurement process for reference by industry peers. I. Requirement Initiation by Department Leadership: From 'Emergency Response' to 'Long-Term Applicability' In September 2025, during a routine inspection of municipal infrastructure, the leadership of the Purchasing Party discovered severe blockages in septic tanks and sewage pipelines across several old residential communities. Moreover, existing vacuum suction trucks could only perform basic pumping without solid-liquid separation or preliminary treatment. Consequently, leadership convened an internal meeting and stated: 'We need a specialized vehicle capable of simultaneous suction and treatment—ideally performing direct solid-liquid separation to reduce transportation costs, while ensuring compliant discharge that does not adversely affect the urban environment.' Per local procurement practice, the budget was capped at approximately RMB 495,000. Requirements included full official vehicle type approval (Announcement), eligibility for standard registration and annual inspection, and reliable after-sales service. II. Internal Model Selection Discussion: Multi-Solution Comparison and Configuration Trade-offs The procurement department subsequently collected technical documentation from multiple manufacturers, focusing on chassis models, sewage treatment methods, tank capacity, and pricing. Below is a summary of comparative data from the internal selection phase (compiled from publicly available tender information): Comparison Item | Chengli Solution (Dongfeng 3308 mm Wheelbase) | Competitor A | Competitor B ---|---|---|--- Chassis Model | Dongfeng EQ1075SJ3CDF (National VI) | Foton BJ1078VEJDA-AB1 | FAW Jiefang CA1040P40K61L2BE5A84 Wheelbase | 3308 mm | 3360 mm | 3300 mm Sewage Treatment Method | Screw Extrusion + Filter Cloth Filtration | Centrifugal Separation | Sedimentation + Membrane Filtration Effective Tank Capacity | Approx. 5 m³ | Approx. 4.5 m³ | Approx. 4.8 m³ Announcement Model Number | CLW5070GSSD6 series, etc. | No corresponding Announcement listing | Incomplete Announcement listing Reference Quotation (Tax-Inclusive, Delivered) | Approx. RMB 380,000–420,000 | Approx. RMB 440,000–480,000 | Approx. RMB 400,000–450,000 Emission Standard | National VI | National VI | National VI After-Sales Service | Nationwide Dongfeng chassis warranty; lifetime upfitting support | 2 years or 50,000 km | 1-year warranty Note: The above data are derived from publicly disclosed tender information and manufacturer quotations; actual configurations shall be governed by the final contract. During internal deliberations, the Purchasing Party highlighted the following advantages of Chengli’s proposal: 1. Comprehensive Announcement Compliance: Models such as CLW5070GSSD6 are officially listed in the MIIT Announcement, enabling nationwide registration and annual inspection. 2. Direct Factory Sales: Elimination of intermediaries results in cost savings of approximately RMB 8,000–15,000 versus 4S-channel equivalents (per Chengli’s internal knowledge base). 3. High Separation Efficiency: The screw extrusion method yields treated wastewater