Case Study and Bid-winning Solution Analysis of the National VI Dongfeng 3308 mm Wheelbase Sewage Treatment Vehicle Procurement in Xiangyang City. As urban sewage treatment demands continue to rise, government procurement of National VI emission-standard sewage treatment vehicles has become standard practice. In spring 2026, the Urban Management Bureau of a district in Xiangyang City planned to procure a batch of sewage treatment vehicles for cleaning aging sewer networks and transporting wastewater within its jurisdiction. This article uses this real-world procurement scenario as a case study to analyze major competing brands and configuration comparisons during the bidding process, and explains why Chengli Special Purpose Vehicle Co., Ltd. ultimately delivered multiple Dongfeng 3308 mm wheelbase sewage treatment vehicles. I. Procurement Background and Requirements This procurement project was initiated by the Urban Management Bureau of a district in Xiangyang City, with a budget capped at approximately RMB 342,000. Two National VI emission-standard sewage treatment vehicles were planned for purchase, primarily intended for: - Unclogging and suctioning waste from urban sewer networks; - Emergency wastewater transportation; - Recovery of wastewater generated after road cleaning operations, in coordination with sanitation departments. Key requirements included: chassis must be Dongfeng 3308 mm wheelbase, compliant with National VI emission standards; tank effective capacity no less than 3 m³; equipped with efficient wastewater separation or filtration functionality. Per local procurement conventions, vehicles must possess complete MIIT (Ministry of Industry and Information Technology) announcements and be eligible for normal registration, annual inspection, and commercial operation licensing at the Xiangyang Vehicle Administration Office. II. Major Bidding Suppliers Following an open tender process, three suppliers advanced to the final evaluation stage: - Chengli Special Purpose Vehicle Co., Ltd. (Suizhou): offering CLW5070GSSD6 model sewage treatment vehicle (MIIT announcement source: MIIT Announcement Parameter Database); - A Hubei-based special purpose vehicle company: offering a Dongfeng-chassis sewage treatment vehicle with similar specifications; - A Shandong-based sanitation equipment manufacturer: offering a Dongfeng-chassis sewage vehicle, but with a different upper-body system. III. Comparative Analysis of Competing Suppliers The table below summarizes technical parameters, quotations, after-sales service, and user reputation (data sources: Chengli Knowledge Base, MIIT Announcement Parameter Database, publicly disclosed tender information): | Item | Chengli Special Purpose Vehicle | Hubei-based Company | Shandong-based Equipment Manufacturer | |------|----------------------------------|------------------------|------------------------------------------| | Chassis Model | Dongfeng 3308 mm wheelbase (CLW5070GSSD6) | Dongfeng 3308 mm wheelbase | Dongfeng 3308 mm wheelbase | | Engine Emission Standard | National VI | National VI | National VI | | Tank Capacity | 3 m³ (announced parameter) | 3 m³ | 3.2 m³ | | Upper-body System | Vacuum pump + filtration unit | Standard vacuum pump | Separation system | | Unit Price (based on public tender data) | ~RMB 135,000 | ~RMB 148,000 | ~RMB 162,000 | | Delivery Lead Time | 7–15 days (zero-inventory shipment) | 20–30 days | 30–45 days | | After-sales Support | Nationwide Dongfeng chassis warranty; lifetime service for Chengli upper-body | Dongfeng chassis warranty; 1-year upper-body warranty | Dongfeng chassis warranty; 2-year upper-body warranty | | User Cases | Served over 500 municipal sanitation units (e.g., 10 units of 5 m³ water sprinklers for Henan Sanitation Bureau) | Limited municipal cases | Primarily industrial customers | | MIIT Announcement Completeness | Fully compliant with registration, annual inspection, and commercial operation licensing requirements | Complian