Government procurement case of National VI Dongfeng sewage treatment vehicle with 3308 mm wheelbase in Xianyang: Transformation from 'manual-intensive operations' to 'mechanized operations'. Against the backdrop of accelerating urbanization, sewage treatment has become one of the core tasks of municipal sanitation. Traditional manual dredging and pumping methods are inefficient, costly, and pose safety hazards. This article presents a case study involving the procurement of Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli') National VI Dongfeng sewage treatment vehicle with 3308 mm wheelbase by a municipal sanitation department in Xianyang. Through pre- and post-deployment performance data comparison, it demonstrates the vehicle’s practical benefits in improving operational efficiency, optimizing personnel allocation, and reducing operating costs—providing objective reference for similar procurement decisions. I. Case Background: Pain Points of Traditional Operations Previously, the municipal sanitation department in Xianyang relied primarily on vacuum suction tankers and manual work teams for sewage treatment. The workflow included manual underground dredging, vacuum suction pumping, and transportation to treatment facilities. According to local procurement practices, the existing configuration consisted of three 5-cubic-meter vacuum suction tankers and two small-scale vacuum pumps, achieving an average daily processing capacity of approximately 120 cubic meters. However, the following issues persisted: • Low Efficiency: Each operation required coordination among 3–5 personnel and took over two hours; frequent round trips to treatment stations were necessary due to limited tanker capacity. • High Personnel Risk: Manual underground dredging posed serious safety hazards—including poisoning and falling accidents—especially during peak rainy-season periods. • Persistently High Costs: Labor accounted for over 60% of total operational expenses, while equipment maintenance costs rose annually. In early 2025, the department planned to procure four National VI emission-compliant sewage treatment vehicles with a 3308 mm wheelbase to enhance operational capability. After multiple rounds of tendering, Chengli Special Purpose Vehicle won the bid with its high cost-performance ratio and customized solution, delivering four units of model CLW5070GSSD6 sewage treatment vehicles (based on Dongfeng chassis, 3308 mm wheelbase, National VI emission standard). II. Pre- and Post-Deployment Performance Comparison The table below summarizes key operational metrics before and after deployment, based on operational data provided by the department (referencing publicly disclosed tender information and internal statistics): Table 1: Comparison of Sewage Treatment Operations Before and After Deployment (Xianyang Municipal Sanitation Department, 2025) | Metric | Before Deployment (Traditional Vacuum Tankers + Manual Labor) | After Deployment (Chengli CLW5070GSSD6) | Change | |--------|-------------------------------------------------------------|-----------------------------------------|--------| | Average Daily Processing Volume (cubic meters) | 120 | 280 | +133% | | Personnel Required per Operation (persons) | 5 | 2 | -60% | | Time Required per Operation (hours) | 2.5 | 1.2 | -52% | | Annual Operating Cost (RMB 10,000s) | ~45 | ~28 | -37.8% | | Equipment Failure Rate (incidents/month) | 3–5 | 1–2 | -60% | III. Efficiency Gains: Daily Operational Capacity Doubled According to feedback from the department, the Chengli CLW5070GSSD6 sewage treatment vehicle features an integrated 'vacuum suction + high-pressure cleaning' design, equipped with an 8-cubic-meter sewage tank and high-pressure water pump. Compared with traditional vacuum tankers, its single-cycle suction time is reduced by 50%, eliminating the need for frequent returns to treatment stations. Data shows that after deploying four units, the average daily proces