Government procurement case of the Dongfeng D6 blue license plate sewage treatment vehicle in Quanzhou: Winning bid solution and winter operation interpretation. Release Date: January 2026 | Source: Chengli Special Purpose Vehicle Co., Ltd. | Based on publicly tendered information. I. Case Background: Procurement Requirements of a Municipal Sanitation Department in Quanzhou. In the second half of 2025, a municipal sanitation department in Quanzhou City, Fujian Province, issued a procurement plan for small-scale sewage treatment vehicles, aiming to address septic tank cleaning in old urban residential areas, silt accumulation in stormwater inlets, and temporary sewage transfer. Due to Quanzhou’s location along the southeast coast—characterized by a humid, subtropical climate with frequent rainy seasons—and its operational zones featuring narrow streets, the procuring entity explicitly required a blue license plate vehicle operable with a Class C driver’s license, overall vehicle height not exceeding 2.2 meters, anti-corrosion coating, and high-durability sealing components. The budget was capped at approximately RMB 387,000 per unit (based on publicly tendered information), with a total order of two units. Ultimately, Chengli Special Purpose Vehicle Co., Ltd. won the bid with its Dongfeng D6 blue license plate sewage treatment vehicle, delivering two units. This case provides an in-depth analysis of the winning solution, with special focus on winter operation and maintenance best practices under humid, hot conditions. II. Winning Bid Solution Interpretation: Dongfeng D6 Blue License Plate Sewage Treatment Vehicle. The awarded model is built upon the Dongfeng D6 chassis (model reference: CLW5070GSSD6 series official announcement) and equipped with a China VI emission-compliant engine. Its key competitive advantages in the tender include: Blue License Plate Compliance: Gross vehicle weight under 4.5 tons, enabling operation with a Class C driver’s license—ideal for narrow roads in Quanzhou’s historic urban districts. Anti-Corrosion Coating: Tank and piping systems feature an epoxy resin + polyurethane composite coating, offering resistance to seawater and acidic/alkaline environments—well-suited to humid, coastal conditions. Sealing Component Durability: All valves and quick-connect couplings utilize oil- and corrosion-resistant rubber, maintaining reliable sealing performance even after repeated actuation. High-Efficiency Operation: Equipped with a high-power vacuum pump achieving up to 8-meter suction depth, reducing single-operation time by 30%. According to feedback from the procuring entity, the vehicle demonstrated stable performance during Quanzhou’s rainy season (annual precipitation: 1,200–1,800 mm), with no electrical failures caused by water ingress. Comparative Data: Dongfeng D6 Blue License Plate Sewage Treatment Vehicle vs. Peer Competitors. Comparison Item | Chengli Dongfeng D6 Blue License Plate Sewage Treatment Vehicle | Industry Peer Competitor (Reference) ---|---|--- Chassis Model | Dongfeng D6 (China VI) | Foton Times (China VI) Gross Vehicle Weight | 4,495 kg (blue license plate) | 4,495 kg (blue license plate) Tank Capacity | Approx. 3.5 m³ | Approx. 3.2 m³ Anti-Corrosion Coating | Epoxy Resin + Polyurethane (standard) | Conventional Anti-Rust Paint (optional) Sealing Material | Oil- and Corrosion-Resistant Rubber | Standard Nitrile Rubber Vacuum Pump Suction Depth | 8 meters | 6–7 meters Delivery Lead Time | 7–15 days (reference database) | 15–25 days Reference Unit Price (Tax-Inclusive, Delivered) | Approx. RMB 300,000–330,000 (based on publicly tendered information) | Approx. RMB 320,000–360,000 Note: Above data compiled from Chengli’s product database and publicly tendered information; specific configurations subject to contractual agreement. III. Winter Operation & Maintenance Guidelines: Dual Scenarios—Northern Low Temperatures and Southern Humidity. Although Quanzhou is located in southern China, occa