Government Procurement Case and Bid-Winning Solution Analysis of Dongfeng Yizhan-Style Sewage Treatment Vehicles in Zhongshan City In a recent procurement initiative by a municipal sanitation department in Zhongshan City, Dongfeng Yizhan-style sewage treatment vehicles emerged as the focal point. The department planned to acquire multiple sewage treatment vehicles for urban sewer network maintenance and river remediation. After issuing a public tender, several suppliers participated in the competitive bidding process. Ultimately, Chengli Special Purpose Vehicle Co., Ltd.’s blue-plate solution—built upon the CLW5070GSSD6 chassis—stood out and secured the contract, delivering five units. This article offers an in-depth analysis of the case, examining key aspects including the comparison between blue-plate (C-class driver’s license) and yellow-plate (B-class driver’s license) configurations, differences in operational costs, technical parameters of Chengli’s blue-plate solution, and applicable user profiles—thereby supporting procurement decision-makers in selecting the optimal solution. Case Background: Sewage Treatment Vehicle Procurement Requirements in Zhongshan City A municipal sanitation department in Zhongshan City required a batch of sewage treatment vehicles to support urban sewer network maintenance. According to publicly released tender information, the project budget was capped at approximately RMB 553,000 per unit, with requirements specifying high-efficiency sewage treatment capability, excellent maneuverability, and suitability for operation on narrow urban roads. The procuring entity specifically emphasized compliance with China VI emission standards and rapid deployment readiness. Following evaluation, Chengli Special Purpose Vehicle’s Dongfeng Yizhan-style blue-plate sewage treatment vehicle solution—priced at approximately RMB 98,000 per unit (per publicly available tender data)—was awarded the contract. Five units have been delivered and are now deployed across multiple districts in Zhongshan City, receiving positive feedback from end users. Blue-Plate (C-Class License) vs. Yellow-Plate (B-Class License): Core Comparative Analysis In sewage treatment vehicle procurement, license plate classification directly impacts driver qualification requirements and operational costs. Below is a detailed comparison between blue-plate (C-class license) and yellow-plate (B-class license) configurations: Comparison Item Blue-Plate (C-Class License), e.g., CLW5070GSSD6 Yellow-Plate (B-Class License), e.g., CLW5180GSSD6 Driver Qualification C1 driver’s license sufficient B2 or higher driver’s license required Gross Vehicle Weight ≤ 4.5 tons (typically 3.5–4.2 tons) ≥ 4.5 tons (typically 8–18 tons) Vehicle Dimensions Length ≤ 6 m; Width ≤ 2.2 m Length ≥ 6 m; Width ≥ 2.3 m Cargo Capacity Tank volume: approx. 3–5 m³ Tank volume: approx. 8–15 m³ Annual Inspection Frequency Once every two years Once per year Expressway Toll Rate Class I passenger vehicle standard (~RMB 0.5/km) Class II freight vehicle standard (~RMB 1.2/km) Urban Access Restrictions Generally unrestricted in most cities Restricted in certain urban zones Applicable Scenarios Narrow urban streets, residential communities, alleys Main roads, large-scale construction sites As shown above, the blue-plate (C-class license) configuration is better suited for urban operations, whereas the yellow-plate (B-class license) configuration is more appropriate for large-scale, long-distance transport tasks. In the Zhongshan City case, the procuring entity selected the blue-plate solution primarily due to narrow urban road conditions, ease of recruiting qualified drivers (high prevalence of C1 licenses), and lower overall operating costs. Operational Cost Differences: Economic Advantages of the Blue-Plate Solution Operational cost is a critical factor in government procurement decisions. Taking the Zhongshan City case as an example, the blue-plate sewage treatment vehicle (