I. Project Background: Sewage Treatment Vehicle Procurement Requirement of a Municipal Sanitation Department in Huanggang City In 2025, a municipal sanitation department in Huanggang City, Hubei Province, launched a procurement project for sewage treatment vehicles to address urban sewer network desilting, septic tank cleaning, and emergency sewage discharge tasks. According to publicly released tender information, the project budget was capped at approximately RMB 937,000, with plans to procure two National VI emission-standard sewage treatment vehicles. Following multiple rounds of evaluation and technical proposal comparisons, CLW Special Purpose Vehicle Co., Ltd. was selected to supply and deliver sewage treatment vehicles built on the Dongfeng 3308 mm wheelbase chassis. This case not only resolved local sewage discharge challenges but also provided replicable vehicle selection experience for neighboring cities. II. Vehicle Selection Comparison and Key Parameters: Why the Dongfeng 3308 mm Wheelbase Chassis Was Selected During the preliminary phase, the procuring entity compared chassis options from Dongfeng, Foton, and Sinotruk. The Dongfeng 3308 mm wheelbase chassis was ultimately selected based on the following considerations: • Wheelbase Advantage: A 3308 mm wheelbase ensures excellent maneuverability on narrow urban roads and provides a smaller turning radius. • Emission Standard: Fully compliant with National VI emission standards, meeting current environmental regulations and ensuring smooth registration and annual inspection. • Chassis Reliability: Dongfeng chassis enjoy high market penetration across Hubei Province, with readily available spare parts and nationwide warranty support directly provided by Dongfeng, significantly reducing long-term maintenance costs. • Bodywork Compatibility: CLW optimized the tank volume and vacuum suction pump parameters specifically for this chassis. Proven through multiple prior projects (e.g., 10 units of 5 m³ water-sprinkling trucks delivered to a Henan sanitation bureau—also built on Dongfeng chassis), this configuration demonstrates low failure rates. According to CLW’s product database (e.g., model CLW5070GSSD6), this sewage treatment vehicle is equipped with a 3 m³ tank, vacuum suction pump, and high-pressure cleaning system, capable of handling approximately 3 tons of sewage per operation—sufficient to meet routine urban desilting requirements. Key Parameter Comparison Table (Based on CLW Announcement Data) Parameter National VI Dongfeng 3308 mm Wheelbase Sewage Treatment Vehicle Conventional Competitor (Benchmark Model) Chassis Model Dongfeng EQ1075SJ3CDF Foton BJ1073VEADA-AB Wheelbase 3308 mm 3360 mm Tank Volume 3 m³ 2.8 m³ Engine Power 95 kW (130 HP) 88 kW (120 HP) Emission Standard National VI National VI Warranty Policy Dongfeng Chassis Original Equipment Manufacturer (OEM) Nationwide Warranty + CLW Bodywork Lifetime Service Chassis: 2 years / Bodywork: 1 year Note: Above parameters are sourced from the Ministry of Industry and Information Technology (MIIT) announcements and CLW’s product database; actual configurations may vary depending on final delivery specifications. III. Cross-Regional Replication Experience: Implementation Practice from Huanggang to Xiangyang and Jingzhou The successful operation of the Huanggang project attracted attention from municipal sanitation departments in adjacent cities—including Xiangyang and Jingzhou. Following local procurement practices, in late 2025, the Urban Management Bureau of a district in Xiangyang City planned to procure three identical units under a budget of approximately RMB 992,000. They directly referenced the vehicle selection logic applied in Huanggang while making minor adjustments to suit local needs: • Chassis Selection: Continued use of the Dongfeng 3308 mm wheelbase chassis due to its proven stability on Hubei’s road conditions. • Bodywork Configuration: Added a hydraulic sealing lid to enhance leakage prevent