I. Case Background and Key Conclusions In 2025, a municipal sanitation department publicly tendered for a batch of new Suizhou Dongfeng wastewater treatment vehicles to meet the requirements of sewer network desilting and emergency response within its jurisdiction. The project ultimately delivered four CLW5070GSSD6 model wastewater treatment vehicles manufactured by Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as "Chengli"), built on Dongfeng chassis and compliant with China VI emission standards. This article analyzes actual operational data from this case, comparing efficiency, staffing, and cost changes before and after deployment, providing reference insights for similar procurement projects. According to public tender information, the total project budget was controlled at approximately RMB 4.004 million, with an average unit price of around RMB 870,000. The procuring entity reported that after commissioning, operational efficiency improved significantly, while personnel and operating costs decreased concurrently, shortening the overall investment payback period to approximately 18 months. II. Comparative Data Before and After Deployment The table below summarizes key performance indicators before and after deployment, based on operational records provided by the client: Comparison Indicator | Traditional Manual Desilting (Pre-deployment) | Chengli Wastewater Treatment Vehicle (Post-deployment) | Change Rate ---|---|---|--- Average Daily Output (m³/day) | ~15 m³ | ~60 m³ | +300% Time per Operation (hours/operation) | ~4 hours | ~1.5 hours | −62.5% Staffing per Shift (persons/crew) | 8 persons | 3 persons | −62.5% Comprehensive Operating Cost (RMB/ton) | ~RMB 200/ton | ~RMB 90/ton | −55% Equipment Failure Rate (average monthly occurrences) | Not applicable (manual labor dominant) | 0.5 occurrences/month (primarily due to chassis maintenance) | Extremely low Note: Data sourced from the client’s internal operational reports, anonymized and processed. III. Increased Daily Output and Staff Optimization 1. Significant Increase in Daily Output Traditional manual desilting relies on vacuum pumps and manual transportation, constrained by environmental conditions and low efficiency, achieving only ~15 m³/day. In contrast, the Chengli CLW5070GSSD6 wastewater treatment vehicle employs a vacuum pump and solid-liquid separation system, enabling a single-load capacity of ~7 m³ of wastewater. Through rapid cyclic operations, daily processing capacity increases to ~60 m³. Client feedback indicates that under emergency scenarios—such as post-rainstorm sewer blockages—the vehicle can handle over 80 m³ per day, demonstrating particularly pronounced efficiency advantages. 2. Staffing Optimization Traditional operations require an 8-person crew: including two operators, three transport workers, two desilting workers, and one safety officer. By contrast, the Chengli wastewater treatment vehicle features an integrated automated control system, requiring only one driver/operator and two auxiliary workers to complete the full workflow—including suction, separation, discharge, and transfer. Based on the client’s labor cost calculations, annual manpower savings per crew amount to approximately RMB 350,000 (referencing local average wage levels). IV. Reduced Operating Costs and Economic Benefits 1. Reduction in Direct Operating Costs Comprehensive operating cost decreased from ~RMB 200/ton under traditional methods to ~RMB 90/ton—a 55% reduction—mainly attributable to: – Optimized fuel consumption: Dongfeng chassis equipped with China VI-compliant engine achieves approx. 12 L/100 km fuel efficiency, outperforming comparable