Case Study and Bid-Winning Solution Analysis of the Yangzhou Dongfeng Wing-Opening Wastewater Treatment Vehicle In daily operations of municipal sanitation authorities, efficiency and cost control in wastewater treatment remain key concerns. Recently, the Urban Management Bureau of a district in Yangzhou conducted a public tender for wastewater treatment vehicles and selected the Dongfeng wing-opening model supplied by Chengli Special Purpose Vehicle Co., Ltd. This case not only reflects the procuring entity’s precise control over technical specifications and long-term operational costs but also provides a replicable vehicle selection framework for other regions. I. Procurement Background and Requirements Analysis A municipal sanitation department in Yangzhou launched a wastewater treatment vehicle renewal project at the end of 2025, primarily aimed at emergency treatment of river sewage and industrial wastewater within its jurisdiction. Following local procurement practices, the budget was capped at approximately RMB 887,000, with plans to procure two units at an estimated unit price of RMB 360,000–400,000. The procuring entity explicitly required: (1) tank capacity of no less than 8 m³; (2) integrated high-pressure cleaning system; and (3) Dongfeng-branded chassis to ensure nationwide warranty coverage and after-sales support. Additionally, considering operational convenience, the wing-opening configuration was prioritized—its rapid deployment capability significantly reduces on-site setup time. After multiple rounds of evaluation, Chengli Special Purpose Vehicle Co., Ltd. advanced to the final bidding stage with its CLW5180GSSD6 model (technical parameters sourced from the MIIT database), a Dongfeng wing-opening wastewater treatment vehicle. This model is built on the Dongfeng DOLICA chassis, features an 8.5 m³ tank, a high-pressure cleaning pump with a rated power of 120 kW, and complies with China VI emission standards (per publicly available tender documents). It meets the requirement of processing up to 50 tons of wastewater per day. Chengli’s quoted unit price was approximately RMB 419,000 (tax-inclusive landed price, per publicly available tender data), about RMB 17,000–22,000 lower than comparable quotations from authorized 4S dealerships—demonstrating the pricing advantage of direct factory supply. II. Technical Proposal and Key Winning Factors During the technical evaluation, Chengli’s proposal stood out in three core areas: • Chassis Warranty & After-Sales Support: Nationwide Dongfeng chassis warranty combined with lifetime upper-structure service from Chengli, plus 24-hour direct shipment of spare parts—this clause served as a bonus criterion in the procurement evaluation, substantially reducing long-term maintenance risks. • Full Regulatory Compliance: The CLW5180GSSD6 model is listed in the MIIT’s official vehicle announcement directory, enabling seamless registration, annual inspection, and commercial operation nationwide—eliminating regional policy restrictions. • Transparent Configuration: Chengli avoids bundled pricing packages; all configurations—including tank material and pump brand—are itemized in detailed specification lists, allowing the procuring entity to customize selections based on actual needs and avoid hidden costs. Ultimately, the district’s Urban Management Bureau signed a supply contract with Chengli for two Dongfeng wing-opening wastewater treatment vehicles. The delivery cycle was approximately 12 days (leveraging Chengli’s zero-inventory dispatch model, with standard models typically delivered within 7–15 days). Both units are now operational at an industrial park in Yangzhou, with user feedback highlighting “intuitive operation and high treatment efficiency.” III. Service Life and Total Cost of Ownership (TCO) Analysis For municipal authorities, vehicle service life and long-term ownership costs are critical decision-making factors. Below is a TCO analysis for the CLW5180GSSD