Government Procurement Case and Bid-Winning Solution Analysis of the National VI Dongfeng 3308 mm Wheelbase Sewage Treatment Vehicle in Dali Bai Autonomous Prefecture A municipal sanitation department in a district of Yunnan’s Dali Bai Autonomous Prefecture recently completed the procurement of a batch of National VI Dongfeng 3308 mm wheelbase sewage treatment vehicles. In the public tender, the unit selected Chengli Special Purpose Vehicle Co., Ltd.’s proposal based on vehicle specifications, after-sales support, and localized service capability. After delivery, the vehicles are primarily used to remove sediments from urban sewer networks and purify wastewater during emergency environmental incidents. This article uses this case as a starting point to detail acceptance inspection standards, parameter verification methods, and Chengli’s delivery process safeguards—providing reference for other procurement entities. I. Case Background and Requirements Analysis Dali Bai Autonomous Prefecture is located on the Yunnan-Guizhou Plateau, with high ecological sensitivity; thus, stringent requirements are imposed on emission standards and service life of sewage treatment equipment. The procurement notice issued by the municipal sanitation department explicitly specified that the chassis must be Dongfeng with a 3308 mm wheelbase, meet National VI emission standards, feature a tank volume sufficient for routine sludge removal operations, and possess sewage treatment capabilities (e.g., solid-liquid separation and filtration functions). Per local procurement practice, the budget was capped at approximately RMB 339,000 per unit, with an indicative unit price around RMB 280,000 (based on publicly available tender information). In its response, Chengli Special Purpose Vehicle offered the CLW5070GSSD6 model sewage treatment vehicle built on the Dongfeng 3308 mm wheelbase chassis (official announcement parameters are publicly verifiable). This solution not only complies with National VI emissions but also integrates a highly efficient solid-liquid separation system capable of rapidly removing impurities from wastewater, thereby enhancing overall treatment efficiency. Ultimately, the department procured two units to address sewage cleaning tasks in areas surrounding the ancient town and rural townships. II. Ten Mandatory Inspection Items Upon Vehicle Acceptance To ensure vehicle quality, the Dali procurement entity conducted strict acceptance inspections covering the following ten items—standard procedures also embedded in Chengli’s routine delivery process: 1. Chassis Consistency Check: Verify that the vehicle chassis is indeed the Dongfeng 3308 mm wheelbase model; confirm that the manufacturer name and model number on the chassis nameplate match those stipulated in the contract. Dongfeng chassis enjoy nationwide warranty coverage; verify completeness of the warranty manual. 2. Engine Emission Certification: Confirm that the engine model meets National VI emission standards; inspect the Environmental Information Sheet provided with the vehicle and verify its registration on the Ministry of Ecology and Environment’s official website. 3. Tank Volume Verification: Measure the actual tank volume using certified metrological tools. Chengli sewage treatment vehicle tanks typically range from 3 to 8 cubic meters (depending on model); measured values must align with announced parameters (e.g., the tank volume specified for model CLW5070GSSD6). 4. Hydraulic System Test: Inspect hydraulic hoses and cylinders for leakage; start the hydraulic pump and test the sewage pump’s suction and discharge capacity, requiring continuous stable operation for 30 minutes without anomalies. 5. Solid-Liquid Separation System Performance: For sewage treatment vehicles, rigorously test the separation unit’s particle removal efficiency; treated effluent must contain solid content below the prescribed regulatory limit. 6. Electrical System Functionality: Verify normal op