Case Study and Bid-Winning Solution Analysis of the Nanchang Dongfeng D6 Sewage Treatment Vehicle (Blue License Plate) Government Procurement Project In a centralized procurement of sanitation vehicles conducted in 2025 by the Urban Management Bureau of a district in Nanchang, Chengli Special Purpose Vehicle Co., Ltd. delivered multiple units—including the Dongfeng D6 blue-license-plate sewage treatment vehicle, a 5-cubic-meter water sprinkler truck, and a 3-cubic-meter vacuum suction truck. These vehicles are primarily deployed for emergency sewage network maintenance in urban areas, road cleaning, and septic tank cleaning, and are now fully operational. This article dissects the vehicle selection rationale, cost control strategy, and service assurance framework of this project based on publicly available tender information and official Chengli technical specifications—providing reference guidance for similar procurement initiatives. I. Project Background and Requirements Analysis The procuring entity is a municipal sanitation department in Nanchang, with a budget capped at approximately RMB 338,000. The tender required vehicles compliant with China VI emission standards and full delivery within 8–12 working days. Key requirements included: • Addressing sluggish sewage discharge in aging urban residential communities—requiring one blue-license-plate sewage treatment vehicle (operable with a Class C1 driver’s license, unrestricted for city driving). • Concurrent procurement of one water sprinkler truck for road dust suppression and one vacuum suction truck for septic tank cleaning. • Supplier must possess end-to-end supply capability across all vehicle categories to minimize administrative overhead from coordinating multiple vendors. Ultimately, Chengli fulfilled the ‘single-order, multi-product, rapid delivery’ tender requirement using the blue-license-plate Dongfeng D6 sewage treatment vehicle (model CLW5070GSSD6) as the core unit, complemented by a 5-cubic-meter water sprinkler truck and a 3-cubic-meter vacuum suction truck (parameters referenced from the CLW5070GSSD6 official announcement and comparable product data). II. Vehicle Selection Analysis: Dongfeng D6 Blue-License-Plate Sewage Treatment Vehicle The Dongfeng D6 chassis (wheelbase: 3,308 mm) is a widely adopted platform for blue-license-plate vehicles, equipped with a Yunnan Power 130-horsepower engine and a WLY 5-speed transmission; its cab accommodates two occupants. The upper-body assembly features Chengli’s proprietary ‘sewage separation + water recycling’ design, standard-equipped with a vacuum pump, a sewage tank (~2.5 m³ capacity), and an automatic hose reel system—enabling emergency cleaning of septic tanks and grease traps while separating solids from liquids for independent disposal. Per the CLW5070GSSD6 model specifications in the knowledge base, the vehicle’s gross vehicle weight rating (GVWR) is 7.36 tons, rated payload ~1.5 tons, and effective tank volume ~2.5 cubic meters. Compared to conventional vacuum suction trucks, its advantages include: • Blue license plate + Class C1 driver eligibility: Unrestricted urban access—ideal for narrow roads in aging residential neighborhoods. • Separation-based operation: Minimizes secondary transport pollution and enhances operational efficiency. • Low kerb weight: ~4.1 tons—lower fuel consumption than yellow-license-plate counterparts (based on comparative vehicle data). III. Cost and Delivery: Advantages of Integrated Procurement For this project, Chengli provided an integrated solution comprising the Dongfeng D6 sewage treatment vehicle, a 5-cubic-meter water sprinkler truck, and a 3-cubic-meter vacuum suction truck. Based on publicly disclosed tender documents and local procurement practices, estimated unit prices and delivery timelines are as follows: | Vehicle Model | Chassis Brand | Key Specifications (per knowledge base) | Estimated On-Site Price (RMB 10,000s) | Delivery Lead Time (days) | |--------