National VI Dongfeng 3308 mm Wheelbase Sewage Treatment Vehicle in Changchun: In-depth Analysis of Government Procurement Cases and Winning Bid Solutions. In cold regions like Changchun, municipal sewage treatment vehicle procurement must not only ensure daily operational efficiency but also withstand severe winter low-temperature challenges. Recently, a municipal sanitation department conducted a public tender for a batch of National VI Dongfeng 3308 mm wheelbase sewage treatment vehicles. Chengli Special Purpose Vehicle Co., Ltd. successfully delivered the vehicles by leveraging its mature diesel-powered solution and forward-looking strategy for new-energy transformation. This article uses this real-world case as a starting point to conduct an in-depth analysis of government procurement selection logic, cost comparisons, and winter adaptability solutions—providing practical references for similar requirements. I. Case Background: Procurement Requirements of a Municipal Sanitation Department in Changchun At the end of 2025, the Urban Management Bureau of a district in Changchun issued a procurement notice for sewage treatment vehicles, planning to acquire six National VI emission-standard units for routine cleaning, suction, and transportation of urban domestic sewage pipelines and septic tanks. The vehicles were required to meet the following core specifications: - Dongfeng chassis with 3308 mm wheelbase, compliant with National VI emission standards (reference model: CLW5070GSSD6 or equivalent platform); - Effective tank capacity of approximately 3–4 m³, equipped with sewage suction, discharge, and high-pressure cleaning functions; - Capable of operating reliably under extreme winter temperatures ranging from −30°C to −40°C in Changchun, requiring proven cold-start performance, stable hydraulic operation at low temperatures, and clearly defined winter maintenance protocols; - Budget capped at approximately RMB 387,000 per unit (based on publicly available tender information). II. Diesel-Powered vs. Battery-Electric Version Cost Comparison: A Pragmatic Choice for Cold Regions With the growing adoption of new-energy sanitation vehicles, some procurement entities have begun considering battery-electric alternatives. However, in frigid regions like Changchun, pure electric versions face practical challenges including significant range reduction and insufficient charging infrastructure. Based on this case, the following multi-dimensional comparison is made between the diesel-powered version (Chengli’s National VI 3308 mm wheelbase sewage treatment vehicle) and a comparable battery-electric version: Comparative Analysis of Diesel-Powered vs. Battery-Electric Versions (Changchun Region) Comparison Dimension | Diesel-Powered (Chengli National VI 3308 mm) | Battery-Electric (Equivalent Class) ------------------------------|-----------------------------------------------|---------------------------------------- Purchase Cost | Approx. RMB 250,000–300,000 (based on Chengli quotations and similar winning bids) | Approx. RMB 400,000–550,000 (post-subsidy, based on market data) Annual Energy Cost | Approx. RMB 30,000–40,000 (15,000 km/year; diesel price: RMB 7.5/L) | Approx. RMB 10,000–15,000 (15,000 km/year; electricity rate: RMB 0.6/kWh) Winter Range/Efficiency | Unaffected; stable engine thermal efficiency | 30%–50% range reduction; frequent recharging required Cold-Start Capability | Equipped with fuel-fired heater and low-temperature battery; reliable start-up down to −35°C | Reduced battery activity; preheating system required; difficult start-up below −30°C Hydraulic System Stability | Uses low-temperature hydraulic oil; remains fluid down to −40°C | Hydraulic pump motor requires additional heating, increasing energy consumption Charging Infrastructure | Not required; refueling available at gas stations or via onboard fuel tank | Requires dedicated charging piles or mo