Zhuzhou National VI Dongfeng 3308 mm Wheelbase Sewage Treatment Vehicle Government Procurement Case and Bid-Winning Solution Analysis Case Background: In spring 2025, a municipal sanitation department in a district of Zhuzhou City, Hunan Province (hereinafter referred to as the 'procuring entity') faced insufficient local sewage treatment capacity and thus needed to procure a batch of sewage treatment vehicles for emergency cleaning and routine pipeline maintenance. After comprehensive evaluation, Chengli Special Purpose Vehicle Co., Ltd.'s National VI Dongfeng 3308 mm wheelbase sewage treatment vehicle was selected, adopting a procurement model of 'trial use of one unit → performance documentation during trial period → comparative evaluation against other market brands → decision on bulk procurement'. This article provides a detailed analysis of this case to serve as a reference for similar government procurement projects. I. Procurement Requirements and Initial Research The procuring entity’s existing aging sewage treatment equipment suffered from non-compliant emissions, low operational efficiency, and frequent maintenance issues. The newly procured vehicles were required to meet the following core criteria: - Comply with China VI emission standards, enabling nationwide registration and annual inspection; - Utilize a Dongfeng chassis to facilitate nationwide warranty coverage; - Possess sewage suction, separation, temporary storage, and preliminary treatment capabilities; - Remain within a budget cap of RMB 338,000 per unit (based on publicly available tender information). Following preliminary market research, the procuring entity shortlisted three potential suppliers: Chengli Special Purpose Vehicle (recommending the Dongfeng 3308 mm wheelbase model), Zoomlion Heavy Industry Science & Technology Co., Ltd. (recommending a FAW Jiefang chassis-based model), and a local upfitting factory. Chengli was prioritized for further evaluation due to its advantages including direct factory sales (no intermediaries), local production in Suizhou, and complete official vehicle announcements. II. Trial-First Approach: Real-World Performance Record of One Chengli Sewage Treatment Vehicle In April 2025, the procuring entity entered into a trial-use agreement with Chengli and received delivery of one Dongfeng 3308 mm wheelbase sewage treatment vehicle (Model: CLW5070GSSD6, sourced from Chengli’s product database). The vehicle features a Dongfeng Doric chassis, a Yuchai 140-horsepower engine, a rated payload capacity of approximately 4.5 tons, and is equipped with a high-capacity sewage tank and vacuum pump system. 30-Day Trial Period Summary: Days 1–7: Primarily assigned to septic tank cleaning tasks in older residential communities within the jurisdiction. Operated 8 hours daily, processing approximately 120 tons of sewage cumulatively. The vacuum pump demonstrated high suction efficiency with no noticeable clogging. Days 8–15: Deployed for emergency drainage following heavy rainfall. Operated continuously for 6 hours in road sections with 40 cm-deep standing water, draining approximately 80 tons. The chassis exhibited excellent off-road capability without becoming stuck. Days 16–30: Conducted routine pipeline maintenance. Collaborated with manual labor to clean inspection chambers; achieved effective sewage separation, with low moisture content in solid residues—facilitating subsequent disposal. Fuel Consumption Record: Average fuel consumption approximated 12 L/100 km, meeting expectations. Trial Summary: Operational efficiency improved by ~40% compared to legacy equipment; zero failures occurred; operators reported the vehicle as 'easy to learn and convenient to maintain'. III. Comparative Analysis: Chengli vs. Zoomlion vs. Local Upfitting Factory Upon completion of the trial period, the procuring entity conducted a horizontal comparison among Chengli’s model and the two alternative proposals, focusing on price, performance, after-