Case Study on Changzhou's Government Procurement of CN6 Dongfeng 3308 mm Wheelbase Sewage Treatment Trucks: Analysis of Efficiency Improvement and Cost Optimization Solutions. In recent years, with tightening environmental regulations and surging urban sewage treatment demands, municipal sanitation departments nationwide have been upgrading their equipment. In 2025, the Urban Management Bureau of a district in Changzhou procured multiple CN6 Dongfeng 3308 mm wheelbase sewage treatment trucks through public tender, manufactured and delivered by Hubei Chengli Special Purpose Vehicle Co., Ltd. Based on real procurement data, this article provides an in-depth analysis across dimensions including pre- and post-deployment efficiency comparison, cost control, and workforce optimization—offering practical reference for similar procurement projects. I. Project Background and Procurement Requirements The Urban Management Bureau of a district in Changzhou is responsible for daily sewage cleaning and emergency response across multiple aging residential communities, industrial parks, and rivers within its jurisdiction. Previously, the unit relied primarily on conventional vacuum trucks and manual cleaning—resulting in low efficiency and high costs, especially during summer flood seasons and sudden pipeline blockages, when response times were inadequate. According to publicly released tender information, the unit procured multiple CLW5070GSSD6 sewage treatment trucks (built on the Dongfeng 3308 mm wheelbase chassis), requiring CN6 emission compliance, high-efficiency vacuum pumps, and automatic unloading functionality, with a budget cap of approximately RMB 277,000 per unit. Hubei Chengli Special Purpose Vehicle Co., Ltd. successfully delivered these vehicles and provided lifetime upper-structure service support. II. Performance Comparison Before and After Deployment The vehicles were delivered progressively starting in June 2025 and underwent a three-month operational performance evaluation upon commissioning. Below is a comparative table compiled from actual operational data (referencing publicly disclosed tender documents and Chengli’s product database): | Indicator | Before Deployment (Conventional Vacuum Trucks / Manual Labor) | After Deployment (Chengli CLW5070GSSD6) | Improvement | |---|---|---|---| | Average Daily Sewage Volume Handled (tons) | 8–10 | 35–40 | +300% | | Time per Operation (hours) | 4–5 | 1.5–2 | −60% | | Average Daily Number of Operations per Vehicle | 2–3 | 6–8 | +200% | | Personnel Required per Vehicle | 4 persons (including driver) | 2 persons (driver + operator) | −50% | | Monthly Operating Cost (fuel, maintenance, labor, RMB) | ~12,000–15,000 | ~7,000–9,000 | −40% | | Emergency Response Time (minutes) | 45–60 | 15–20 | −65% | Note: Data sourced from internal operational reports of the bureau and Chengli’s after-sales tracking records; for reference only. III. Increase in Average Daily Operational Capacity: From 'Bottleneck' to 'Overcapacity' Conventional vacuum trucks—limited by small tank capacities (typically 3–5 m³) and low-efficiency vacuum pumps—require frequent return trips to designated discharge points after each operation, severely restricting daily throughput. In contrast, the Chengli CLW5070GSSD6 sewage treatment truck, built on the Dongfeng 3308 mm wheelbase chassis, features an effective tank capacity of 5 m³ (per official specifications), paired with a high-power vacuum pump and automated unloading system—enabling significantly greater sewage volume handling per operation. Customer feedback indicates that, during sewer cleaning operations in Changzhou’s historic urban area, the vehicle achieves 6–8 daily operations—approximately double the previous rate. Notably, during the continuous heavy rainfall in August 2025, the vehicle operated continuously for 12 hours.