Government procurement case of Dongfeng Yizhan-style sewage treatment vehicle in Deyang: A practical interpretation of the transition from trialing one unit to bulk procurement. In early 2025, a municipal sanitation department in a district of Deyang City faced challenges—including low treatment efficiency and poor mobility—while performing urban pipeline desilting and emergency sewage treatment using outdated equipment. After extensive research, the department adopted a procurement model of 'trial one unit → record performance during trial period → compare with other brands on the market → decide on bulk procurement', ultimately selecting Chengli Special Purpose Vehicle Co., Ltd.'s Dongfeng Yizhan-style sewage treatment vehicle. Below is the complete documentation and analysis of this case. I. Background and Decision-Making for the Trial Approach The department’s existing sewage treatment equipment consisted primarily of fixed pump stations, with a processing capacity of approximately 50 m³/hour, yet incapable of responding effectively to sudden pipeline blockages or emergency discharge requirements. Following heavy rainfall in late 2024, the outdated equipment—due to its limited mobility—failed to prevent sewage overflow, resulting in an environmental penalty of approximately RMB 80,000 (based on local procurement practices). Management decided to first trial one mobile sewage treatment vehicle, focusing specifically on evaluating its treatment efficiency, maneuverability, and operational convenience. Chengli’s Dongfeng Yizhan-style sewage treatment vehicle (Announcement Model No.: CLW5120TWC6) was selected as the top candidate, owing to its Dongfeng Dolika chassis, wing-type body design facilitating interior equipment maintenance, and delivery capability within 7–15 days from Chengli’s Suizhou production base. II. Performance Record During Trial Period (March–June 2025) During the trial, the vehicle was primarily tasked with: • Emergency pumping and drainage: Handling floodwater accumulation in low-lying urban road sections; each operation lasted ~3 hours and processed ~200 m³ of sewage. • Pipeline desilting: Performing segmented cleaning of aging pipelines in conjunction with suction functionality, achieving an average daily processing volume of ~80 m³. • Mobile support: The wing-type body design enabled equipment maintenance without disassembling piping systems, saving ~40% maintenance time. Key performance metrics: • Treatment efficiency: Average daily processing volume per unit reached 100–120 m³, representing a ~30% improvement over fixed pump stations. • Fuel consumption cost: Equipped with a China VI-compliant diesel engine, fuel consumption averaged ~18 L/100 km, ensuring controllable operating costs. • Failure rate: Only one incident occurred over three months—a water pump seal wear—and Chengli’s after-sales team replaced the part within 24 hours (in compliance with Chengli’s lifetime service commitment for superstructures). The department head commented: “The trial period confirmed that this vehicle can meet ~70% of routine emergency demands, especially excelling in mobility.” III. Comparative Analysis Against Other Market Brands: Data and Decision-Making Upon completion of the trial period, the department compared Chengli’s Dongfeng Yizhan-style vehicle against two other mainstream sewage treatment vehicles available on the market, referencing publicly disclosed tender information and industry specifications: Comparison Item | Chengli Dongfeng Yizhan (CLW5120TWC6) | Brand A (Sinotruk Chassis) | Brand B (FAW Jiefang Chassis) ---|---|---|--- Chassis Brand | Dongfeng Dolika | Sinotruk HOWO | FAW Jiefang J6 Sewage Pump Flow Rate | 150 m³/hour | 120 m³/hour | 100 m³/hour Maximum Suction Depth | 7.5 meters | 6 meters | 6.5 meters Body Design | Wing-type (facilitates maintenance) | Conventional enclosed | Conventional enclosed Diesel Tank Capacity | 120 liters | 100 liters | 110 liters Emission Standard | China VI |