Hefei Dongfeng D6 Blue-Plate Sewage Treatment Vehicle Government Procurement Case: A Real-World Analysis from Requirement Identification to Delivery In 2025, a municipal sanitation department in a district of Hefei issued a public tender for a batch of blue-plate sewage treatment vehicles to address sewer network cleaning and emergency response needs within its jurisdiction. Following multiple rounds of evaluation and on-site inspections, Chengli Special Purpose Vehicle Co., Ltd. delivered three blue-plate sewage treatment vehicles (model CLW5070GSSD6) based on the Dongfeng D6 chassis. This article reconstructs the full procurement process based on publicly available tender information and customer feedback, offering reference for equipment selection and solution planning to peer organizations. I. Procurement Background and Core Requirements The district’s municipal department routinely handles septic tank and sewer pipe blockages in aging residential communities and farmers’ markets. Previously, it relied heavily on rented vacuum trucks and manual cleaning—methods that were inefficient and costly. The current procurement objectives were clearly defined: • Blue-plate license, operable with a Class C driver’s license: To lower driver qualification thresholds and avoid the high cost of hiring drivers holding a Class B license; • Multi-function integration: Must combine vacuum suction, sewage discharge, and high-pressure cleaning capabilities to minimize redundant equipment investment; • Budget control: Unit budget capped at approximately RMB 134,000 (per publicly disclosed tender information), requiring high cost-effectiveness; • After-sales support: Chassis must be covered under nationwide warranty; superstructure must enable rapid repair response. II. In-Depth Analysis of Chengli’s Winning Solution To meet the above requirements, Chengli Special Purpose Vehicle recommended the CLW5070GSSD6 sewage treatment vehicle. This model is built upon the Dongfeng D6 single-cab chassis (wheelbase: 3,308 mm), equipped with either a Quanchai or Yunnan Diesel engine delivering 85–95 kW output and compliant with China VI emission standards. Key specifications include: • Tank capacity: 3.5–4 m³, fabricated from high-quality carbon steel plates supplied by Wuhan Iron and Steel Group (WISCO), with anti-corrosion treatment; • Vacuum suction system: Fitted with a water-ring vacuum pump, achieving a maximum suction lift ≥7 meters and high suction efficiency; • High-pressure cleaning: Integrated plunger pump (pressure range: 20–30 MPa) for pipeline unclogging; • Control design: Hydraulic or manual control valves; hydraulic rear tank lid opening for convenient unloading. According to feedback from the procuring entity, this solution prevailed due to the following advantages: • Complete regulatory compliance: The CLW5070GSSD6 is listed in the MIIT Vehicle Announcement, enabling nationwide registration, annual inspection, and commercial operation; • Short delivery cycle: Chengli’s Suizhou factory shipped directly from zero inventory—delivery time from order placement to vehicle pickup was only 11 days (standard lead time: 7–15 days); • Outstanding cost-effectiveness: Factory-direct sales eliminate intermediaries; same-specification models cost approximately RMB 8,000–12,000 less than those purchased through 4S dealerships, resulting in a final unit price of around RMB 105,000 (based on local procurement practice); • Robust after-sales commitment: Dongfeng chassis covered under nationwide warranty; Chengli superstructure supported by lifetime service, with spare parts dispatched within 24 hours. III. Comparative Data: Mainstream Blue-Plate Sewage Treatment Vehicle Solutions Comparison Item Chengli Dongfeng D6 Blue-Plate Vehicle (CLW5070GSSD6) Other Brands’ Comparable Models (Reference) Chassis Brand Dongfeng (Nationwide Warranty) Some use secondary-tier chassis brands Tank Capacity 3.5–4 m³ 2.5–3.5 m³ Vacuum Suction System Water-ring vacuum pump, s