Case Study and Bid-winning Solution Analysis: Jinan Municipal Dongfeng D6 Blue-plate Sewage Treatment Vehicle Government Procurement, 2025 In 2025, a district Urban Management Bureau in Jinan issued a public tender for one blue-plate sewage treatment vehicle to address urban black-and-odorous water body remediation and stormwater pipe desilting needs. The procurement budget was capped at RMB 430,000. Key technical requirements included: compliance with China VI emission standards; Dongfeng D6 series chassis; integrated capabilities for suction, solid-liquid separation, filter pressing, and temporary storage; and eligibility for blue license plate registration (i.e., operable with a C1 driver’s license). After multiple rounds of technical evaluation and commercial bidding, Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli') delivered the vehicle under a bid price of approximately RMB 365,000 (based on publicly available tender information). The vehicle is now operational in Jinan, primarily deployed for emergency treatment of residential septic tanks, river sewage, and municipal inspection wells. This article analyzes the major competing brands involved in the tender, compares their respective strengths and weaknesses, and explains why Chengli ultimately won the bid. I. Overview of Major Bidding Brands and Their Proposals According to publicly available procurement records and industry practice, four enterprises submitted complete proposals for this tender: three were leading domestic special-purpose vehicle manufacturers, and one was a local modification workshop. All core models were based on the Dongfeng D6 chassis (reference model: EQ1075SJ3CDF), with a wheelbase of 3,308 mm, rated payload of approx. 1.5–2 tons, and engines from Quanchai or Yuchai, delivering power output of approx. 85–95 kW. Key brand proposals and features are summarized below: Chengli Special Purpose Vehicle (Suizhou, Hubei): CLW5070GQW6 (official announcement model); effective tank capacity approx. 3.5 m³; dual-pump system (vacuum pump + high-pressure pump); solid-liquid separation unit combining hydrocyclone and plate-and-frame filter press; total system power approx. 15 kW; upper-structure weight controlled within 1.2 tons—ensuring gross vehicle weight remains below the blue-plate limit of 4.5 tons. Zoomlion Environmental Industry (Changsha, Hunan): ZBH5070GQX; tank capacity 3.3 m³; screw pump with vacuum assist; solid-liquid separation via screw extrusion; slightly higher power demand (approx. 18 kW); however, higher curb weight (~4.3 tons), approaching the blue-plate upper limit. Foton Leisha (Zhucheng, Shandong): FHM5070GQW; tank capacity 3.2 m³; single-pump system (vacuum pump only); centrifugal solid-liquid separation; simple structure but lower treatment efficiency; power requirement approx. 12 kW. Local Modification Workshop (Jinan, Shandong): Non-certified model; modified Dongfeng D6 chassis without official announcement number; ad-hoc assembly approach; tank capacity approx. 3.8 m³, but lacking solid-liquid separation functionality—offering only suction and basic filtration. II. Comparative Analysis Table of Strengths and Weaknesses The following quantitative comparison evaluates all four proposals against the procurement’s technical specifications, budget constraints, and after-sales service requirements. Data sources include MIIT vehicle announcements, publicly released tender documents, and industry expertise. Comparison Dimension Chengli CLW5070GQW6 Zoomlion ZBH5070GQX Foton Leisha FHM5070GQW Local Modification Workshop (Non-Certified) Chassis Model Dongfeng D6 (EQ1075SJ3CDF) Dongfeng D6 (EQ1075S