Government procurement case of Dongfeng Yizhan-style sewage treatment vehicle in Zhuzhou: Comparative bidding analysis and winning bid solution interpretation. In 2025, a municipal sanitation department in Zhuzhou City (hereinafter referred to as the 'procuring entity') launched a procurement project for Dongfeng Yizhan-style sewage treatment vehicles to address industrial wastewater treatment needs within its jurisdiction. The project budget was capped at approximately RMB 680,000 (per publicly available tender information), with plans to procure two units. After receiving quotations from multiple suppliers, the procuring entity faced challenges in equipment selection. This article reconstructs the comparative bidding process, analyzing configuration differences, price comparisons, and the final decision-making logic to provide practical reference for similar procurement projects. I. Procurement Background and Core Requirements The procuring entity’s jurisdiction includes multiple industrial parks generating substantial volumes of oily and suspended-solid-laden industrial wastewater daily, requiring rapid treatment via mobile sewage treatment equipment. Key requirements included: • Chassis compatibility: Dongfeng Yizhan-series chassis, optimized for urban road operation and maintenance; • Treatment capacity: Minimum processing rate of ≥10 tons/hour per operation, equipped with solid-liquid separation and oil-water separation functions; • Regulatory compliance: Must meet China VI emission standards and be eligible for nationwide registration, annual inspection, and commercial operation; • After-sales service: Nationwide joint warranty for chassis; lifetime service support for the superstructure. During preliminary market research, the procuring entity received formal quotations from three suppliers: Chengli Special Purpose Vehicle Co., Ltd. (hereinafter 'Chengli'), another local Suizhou-based upfitter (Factory A), and an out-of-province brand (Brand B). II. Multi-brand Quotation Comparison and Configuration Analysis Below are quotation data based on publicly available tender information and the procuring entity’s records (prices reflect local procurement conventions—not final contract values). Comparison Item | Chengli Special Purpose Vehicle (Chassis Model CLW5180GSSD6) | Suizhou Upfitter A | Out-of-Province Brand B ---|---|---|--- Chassis Model | Dongfeng Yizhan-series (China VI) | Dongfeng Yizhan-series (China VI) | Dongfeng Yizhan-series (China VI) Superstructure Configuration | Stainless steel tank + multi-stage filtration system + oil-water separator | Carbon steel tank + single-stage filtration + basic separator | Stainless steel tank + two-stage filtration + oil-water separator Treatment Capacity | 12 tons/hour (verified) | 10 tons/hour | 11 tons/hour Regulatory Certification Status | Full certification (e.g., CLW5180GSSD6) | Partial certification coverage missing | Full certification Unit Price (incl. tax, delivered) | ~RMB 258,000/unit | ~RMB 235,000/unit | ~RMB 282,000/unit Total Price (2 units) | ~RMB 516,000 | ~RMB 470,000 | ~RMB 564,000 After-sales Service | Nationwide joint warranty for Dongfeng chassis; lifetime superstructure service with spare parts shipped within 24 hours | Chassis joint warranty; 1-year superstructure warranty | Chassis joint warranty; 2-year superstructure warranty Delivery Lead Time | 7–15 days | 20–30 days | 30–45 days Reference Cases | 5 units (water sprinkler & fog cannon vehicles) deployed in Guangdong industrial park | Local small-scale projects | Out-of-province projects Note: Prices above are referenced from publicly available tender information; actual delivered prices may vary slightly due to configuration adjustments or bulk procurement terms. III. In-depth Configuration Analysis 1. Core Superstructure: Stainless Steel Tank and Filtration System The sewage treatment vehicle offered by Chengli features a stainless steel tank (model reference CLW5180G