Government procurement case of Dongfeng D6 blue-plate 3-cubic-meter sludge tipper truck in Zibo: Interpretation of volume selection and cost-control solutions. In municipal sanitation, sludge transport trucks are critical equipment ensuring the normal operation of urban drainage systems and wastewater treatment plants. In 2024, the Urban Management Bureau of a district in Zibo, Shandong Province launched a vehicle renewal project targeting aging sludge transport trucks, ultimately procuring a batch of Dongfeng D6 blue-plate 3-cubic-meter sludge tipper trucks. This article reviews this typical case from four dimensions—volume selection, daily workload calculation, budget alignment, and bid-winning solution design—to provide replicable procurement insights for similar institutions. I. Project Background and Requirements Analysis The agency is responsible for sewer network desilting and sludge transportation from local wastewater treatment plants. Its existing fleet had been in service for over eight years, meeting only China IV/V emission standards, thus failing to comply with current environmental regulations. Field investigations revealed the following key challenges: - Narrow urban roads prevent large yellow-plate sludge trucks from accessing older residential communities and back alleys; - Average daily sludge generation is approximately 10 tons, requiring 2–3 round trips per vehicle to complete daily transport; - Budget must be controlled at ≤¥136,000 per unit, with mandatory blue-plate registration (drivable with C1 driver’s license); - Self-unloading capability is required for efficient unloading at designated sites. Based on these criteria, the Dongfeng D6 blue-plate 3-cubic-meter sludge tipper truck emerged as the optimal choice. Its chassis is derived from the Dongfeng Duolika D6 series—featuring a short wheelbase and small turning radius, ideal for complex urban road conditions. The superstructure is supplied by Chengli Special Purpose Vehicle Co., Ltd., fabricated using high-strength steel plates, with a 3-cubic-meter capacity and rated payload of ~1.5 tons—ensuring efficient single-trip performance. II. Volume Selection: Why Is 3 Cubic Meters the 'Golden Capacity' for Urban Sludge Operations? In sludge tipper truck selection, larger volume does not necessarily mean better performance. According to Chengli Special Purpose Vehicle’s product database and MIIT announcement parameters (e.g., reference models such as CLW5070GSSD6), the 3-cubic-meter configuration offers distinct advantages in the following scenarios: Volume Specification | Chassis Type | Application Scenario | Daily Workload Reference (per unit) | Reference Budget (Tax-Inclusive Landed Price) ---|---|---|---|--- 3 m³ | Dongfeng D6 (Blue Plate) | Urban sewer network desilting; sludge transport from small-scale wastewater treatment plants | 8–15 tons/day (3–5 round trips) | ¥95,000–¥120,000 5 m³ | Dongfeng / Foton (Yellow Plate) | Medium-scale wastewater treatment plants; main municipal road desilting | 15–25 tons/day (2–3 round trips) | ¥140,000–¥170,000 8 m³ | Sinotruk / FAW Jiefang (Yellow Plate) | Large-scale wastewater treatment plants; centralized transport | 25–40 tons/day (1–2 round trips) | ¥190,000–¥240,000 12 m³ | Shaanxi Automobile / Dongfeng (Yellow Plate) | Long-distance transport; large-scale operations | 40–60 tons/day (1–2 round trips) | ¥240,000–¥300,000 Note: Daily workload estimates assume single-vehicle operation, transport distance ≤10 km per trip, and include loading/unloading time; budget figures reflect Chengli Special Purpose Vehicle’s 2026 tax-inclusive landed prices and publicly available tender data. For the Zibo project, the 3-m³ model can carry ~1.5 tons of sludge per trip. To handle the average daily requirement of 10 tons, a single vehicle would need to complete seven round trips—though accounting for loading/unloading time, five to six trips are realistically achievable. While the 5-m³ model offers higher per-trip pay