Government procurement case of the National VI Dongfeng 3308 mm wheelbase sewage treatment vehicle in Zhengzhou: Chengli’s solution and bid-winning analysis. With the full implementation of the National VI emission standard, a municipal sanitation department in Zhengzhou launched a program to replace aging sewage treatment vehicles at the end of 2025. This article provides a detailed analysis of the Dongfeng 3308 mm wheelbase sewage treatment vehicle procurement case, integrating policy background, Chengli Special Purpose Vehicle’s National VI solution, and subsidy stacking strategies. I. Policy Background for the National VI Transition and Phasing-Out Timeline for Older Vehicles According to the 'Limits and Measurement Methods for Pollutant Emissions from Heavy-Duty Diesel Vehicles', all heavy-duty diesel vehicles manufactured, imported, sold, or registered since July 2021 must comply with the National VI standard. As a key region, Zhengzhou requires the complete elimination of National III (and lower) emission-standard vehicles by the end of 2025, while National IV vehicles face progressively stricter driving restrictions. The Dongfeng 3308 mm wheelbase chassis is a common choice for municipal sewage treatment vehicles; the original National V version required upgrading to National VI. Chengli Special Purpose Vehicle Co., Ltd. (located in Chengli Automobile Industrial Park, Economic Development Zone, Suizhou City, Hubei Province) has developed a National VI sewage treatment vehicle based on the Dongfeng 3308 mm wheelbase chassis, model CLW5070GSSD6, featuring an original Dongfeng chassis compliant with National VI emission requirements—ensuring normal operation within restricted zones such as Zhengzhou. II. Chengli’s National VI Sewage Treatment Vehicle Solution This procurement targets the Dongfeng 3308 mm wheelbase sewage treatment vehicle, with the following key technical specifications: Chassis Model: Dongfeng EQ1075SJ3CDF (3308 mm wheelbase), National VI emission compliant Engine: Yunnan Power D20TCIF1, rated power 93 kW Tank Capacity: Approximately 4–6 m³ (optimized per official announcement parameters) Sewage Treatment System: Equipped with vacuum pump and filtration unit; treatment capacity approx. 30–50 m³/hour Upper-structure Configuration: Chengli-manufactured tank and piping system, lifetime after-sales support Chengli’s solution emphasizes nationwide OEM chassis warranty and lifetime upper-structure service, with spare parts shipped directly within 24 hours—ideal for long-term use by municipal authorities. III. How Subsidy Policies Can Be Stacked Zhengzhou offers special subsidies for phasing out older vehicles: Phasing-out Subsidy: Approx. RMB 10,000–30,000 per National III vehicle, calculated based on vehicle age and emission standard New Energy / National VI Purchase Subsidy: Approx. RMB 5,000–10,000 per National VI sanitation vehicle Chengli Manufacturer Discount: As a direct factory supplier, Chengli’s quotations are RMB 8,800–16,500 lower than those from 4S dealerships, further reducing procurement costs. According to publicly released tender information, the budget for this procurement was controlled at approximately RMB 308,000–385,000 per unit (referencing the price range of 5 m³ street sweepers); however, due to configuration differences, sewage treatment vehicles typically cost around RMB 220,000–308,000 per unit (per local procurement practice). Chengli provides transparent pricing without bundled packages, helping customers maximize combined subsidies. IV. Comparative Data Table (HTML Format) | Item | National V Model (Legacy) | Chengli National VI Model (CLW5070GSSD6) | |------|---------------------------|------------------------------------------| | Emission Standard | National V | National VI | | Chassis Wheelbase | 3308 mm | 3308 mm | | Engine Power | Approx. 85 kW | 93 kW (Yunnan D20TCIF1) |