1. Requirements and Pain Points: Low Efficiency in Cleaning Aging Sewage Pipelines. In early 2025, an environmental maintenance unit of a street in Datong discovered during routine inspections that sewage pipelines in multiple old residential communities—long neglected—had suffered severe sediment blockages, resulting in poor drainage during rainy seasons and even sewage backflow in some low-lying areas. An existing vacuum suction truck, over 10 years old, failed to meet current emission standards, exhibited reduced suction capacity, and featured an outdated chassis—rendering it incapable of fulfilling daily operational requirements. Mr. Li, the unit’s director, stated at an internal meeting: 'We need equipment capable of both high-efficiency sludge suction and flexible maneuverability within old residential neighborhoods—ideally with a trial period to verify performance before committing to bulk procurement.' After preliminary market research, the team focused on Chengli Special Purpose Vehicle Co., Ltd.’s Dongfeng D6 Blue License Plate Sewage Treatment Vehicle. This model is built upon the Dongfeng D6 chassis, complies with China VI emission standards, and—bearing a blue license plate—can be operated by drivers holding a Class C driver’s license, with no urban access restrictions. 2. Trial Deployment: 30-Day Real-World Validation In March 2025, Chengli Sales Manager Zhang Yue (Tel: ) coordinated the provision of one Dongfeng D6 Blue License Plate Sewage Treatment Vehicle (Announcement Model No.: CLW5070GSSD6) for a free 30-day trial use by the unit. During the trial, the vehicle was deployed to three of the most severely clogged road sections within the jurisdiction. Trial Performance Summary: Days 1–3 (Initial Break-in): Operators familiarized themselves with the vehicle’s control system and found its vacuum pump achieved a maximum suction depth of 6 meters—significantly exceeding the previous equipment’s 4.5 meters. On the first section, a single operation removed approximately 3 cubic meters of accumulated sludge in just 45 minutes. Days 4–10 (Continuous High-Intensity Operation): For septic tank cleaning on the second section, the vehicle performed exceptionally well—transporting a full tank (~5 m³ of wastewater) to the treatment station in one trip. With a round-trip distance of ~8 km, it completed an average of four trips per day—more than double the efficiency of the old equipment. Days 11–30 (Comprehensive Operational Validation): Under adverse conditions—including gravel roads and rain/snow weather—the Dongfeng D6 chassis demonstrated excellent off-road capability, with no instances of wheel slip or engine stalling. The upper assembly (tank body and piping) experienced zero failures, requiring only routine cleaning and maintenance. Upon completion of the trial, Director Li noted in his summary report: 'Chengli’s vehicle completed the originally scheduled two-month cleanup workload within 30 days, directly saving approximately RMB 30,000 in labor and vehicle leasing costs.' 3. Comparative Analysis: Chengli CLW5070GSSD6 vs. Competing Models During the trial period, the unit simultaneously benchmarked two other comparable models on the market (Brand A and Brand B). Based on actual field data, the following comparison table was compiled: Comparison Item | Chengli CLW5070GSSD6 | Brand A (XX Brand Vacuum Suction Truck) | Brand B (XX Brand Sewage Truck) ---|---|---|--- Chassis Model | Dongfeng D6, China VI Emission Standard | Foton Times, China V (inventory stock) | FAW Jiefang Hu-V, China VI Tank Capacity | ~5 m³ (official announcement parameter) | ~4.5 m³ | ~5.2 m³ Maximum Suction Depth | 6 m (verified via field testing) | 4.5 m (field test showed suboptimal performance) | 5.5 m (verified via field testing) Blue License Plate / Class C Driver’s License Eligibility | Yes | Yes (but fails current emission standards) | Yes After-Treatment System