Government Procurement Case of Dongfeng D6 Blue-Plate Sewage Treatment Truck in Haikou: Analysis of Efficiency Improvement and Cost Optimization Solutions. In the hot, humid, and rainy climate of Haikou, municipal sanitation authorities have long struggled with sewage treatment equipment operating under high load, rapid corrosion and aging, and low operational efficiency. In early 2026, a municipal sanitation department procured a batch of Dongfeng D6 blue-plate sewage treatment trucks via public tender for routine cleaning and unclogging operations on urban sewage pipelines and septic tanks. Below is an analysis—based on real procurement data—of improvements in operational efficiency, workforce configuration optimization, and reductions in operating costs following deployment of this vehicle model. I. Project Background and Vehicle Selection Considerations The procuring entity was a sanitation unit under the Urban Management Bureau of a district in Haikou City, primarily tasked with addressing sewage pipe blockages in older residential communities, commercial districts, and municipal roads. Per local procurement practices, the project budget was capped at approximately RMB 133,000 per unit, with requirements including blue license plate classification (drivable with Class C driver’s license), strong off-road capability, and suitability for long-term operation in hot and humid environments. Ultimately, Chengli Special Purpose Vehicle Co., Ltd.’s Dongfeng D6 blue-plate sewage treatment truck (model reference: CLW5070GSSD6 series modified version) won the bid, delivering three units. During selection, the client placed particular emphasis on anti-corrosion coating technology and the durability of sealing components under hot and humid conditions. Haikou’s annual average humidity exceeds 80%, with a rainy season lasting six months; ordinary steel and rubber seals are prone to rusting and premature aging. Prior to delivery, Chengli applied full-vehicle electrophoretic anti-corrosion treatment to both chassis and superstructure, and used fluororubber seals—resistant to high temperatures, oil, and corrosion—to ensure extended service life under frequent operation. II. Performance Comparison Before and After Deployment The vehicles were delivered in late 2025 and officially entered service in January 2026. The comparative data below is derived from the unit’s three-month trial operation report (source attribution: acceptance records cited in publicly available tender documentation). Indicator Before Deployment (Conventional Suction Trucks) After Deployment (Dongfeng D6 Blue-Plate Sewage Treatment Truck) Improvement Average Daily Work Volume (m³/day) ~15 m³ ~25 m³ +66.7% Average Time per Operation (hrs/operation) ~3 hrs ~1.8 hrs −40% Required Operators per Vehicle (persons/vehicle) 3 persons 2 persons −33.3% Average Monthly Maintenance & Repair Cost (RMB/vehicle) ~RMB 1,500 ~RMB 800 −46.7% Equipment Failure Rate (incidents/month) ~4 incidents ~1 incident −75% III. Efficiency Improvement Analysis: 66.7% Increase in Average Daily Work Volume Conventional suction trucks frequently suffer pump clogging and seal failure under high-load monsoon conditions, resulting in prolonged operation times per job. The Dongfeng D6 blue-plate sewage treatment truck features a high-power vacuum pump and an automatic backflush system, combined with anti-corrosion coatings, enabling stable and continuous operation in hot and humid environments. According to client feedback, during peak rainy-season demand, daily work volume increased from ~15 m³ to ~25 m³, effectively alleviating pipeline blockage pressures. The reduction in average operation time—from ~3 hours to ~1.8 hours per job—stems primarily from the vehicle’s compact design (blue-plate, Class C license compliant) and an optimized liquid-level control system, minimizing downtime caused by operator inexperience. IV. Workforce Configuration Optimization: From 3