Changsha Dongfeng D6 Sewage Treatment Vehicle (Blue License Plate) Government Procurement Case: Solution Interpretation and Procurement Advantage Analysis. Between 2024 and 2025, a municipal sanitation department in a district of Changsha City procured eight Dongfeng D6 chassis-based blue license plate sewage treatment vehicles in two batches via centralized government procurement, with a total contract value of approximately RMB 2.2 million (based on publicly available tender information). These vehicles are primarily deployed for cleaning aging urban sewer networks, emptying septic tanks, and emergency sewage treatment—serving as critical equipment for advancing refined urban management. This article is based on the authentic bidding proposal and delivery records provided by Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli'), dissecting the core elements of this bulk procurement success and offering reference guidance for future purchasing entities. I. Project Background and Procurement Requirements The procuring entity is an environmental maintenance unit under a subdistrict office in Changsha City. Its jurisdiction encompasses numerous old residential communities and aging, deteriorating sewer networks, resulting in frequent public complaints regarding sewage overflow. The previous outsourced service model incurred high costs and slow response times; therefore, the unit decided to establish its own small-scale sewage treatment fleet. Key procurement requirements were clearly stipulated: - Vehicle Classification: Blue license plate, operable with a Class C driver’s license—ensuring unrestricted access within urban areas; - Chassis Requirement: Dongfeng Duolika D6 (same series as CLW5070GSSD6), with comprehensive after-sales service network coverage; - Functional Requirements: Integrated functions of suction, discharge, and sewage treatment—enabling continuous cyclic operations; - Budget Control: Unit price capped at RMB 280,000 (tax-inclusive landed cost). II. Chengli’s Proposal and Bid Award Status Leveraging its local manufacturing advantage in Suizhou and nationwide warranty service system, Chengli Special Purpose Vehicle stood out among multiple bidders. Both procurement batches adopted the Dongfeng D6 chassis paired with Chengli’s proprietary upper-body assembly. Core specifications are as follows: | Configuration Item | Dongfeng D6 Blue License Plate Sewage Treatment Vehicle (Chengli CLW Model) | Specification Details | |---------------------|-----------------------------------------------------------------------------|------------------------| | Chassis Model | Dongfeng Duolika D6 (China VI Emission Standard) | Yuchai 140 hp / Quanchai 130 hp options available | | Tank Capacity | Sewage Tank: 3.5 m³ + Fresh Water Tank: 1.5 m³ | Dual-tank design enabling segregated operations | | Suction Pump | Weilong Vacuum Pump (standard configuration) | Suction lift ≥ 8 m; pumping rate: 80 L/min | | Sewage Treatment System | High-Density Filtration + Centrifugal Separation | Treatment capacity: 15 m³/h; solid–liquid separation efficiency ≥ 90% | | Maximum Speed | 110 km/h | Highly maneuverable for urban operations | | License Plate Type | Blue license plate (Class C driver’s license applicable) | No traffic restrictions within urban areas | | Delivery Unit Price (Tax-Inclusive Landed Cost) | Approx. RMB 265,000/unit (based on publicly available tender information) | Uniform pricing across both batches | A total of five units were delivered in the first batch and three in the second, amounting to a total contract value of approximately RMB 2.2 million. According to feedback from the procuring entity, Chengli’s solution offered savings of about RMB 14,000 per unit compared to quotations from authorized 4S dealerships, while also providing original-chassis nationwide warranty coverage and lifetime service support for the upper-body assembly—key factors contributing to its successful bid. III. Core R