In early 2026, a municipal sanitation department in Wuxi procured a batch of sewage treatment vehicles via public tender to meet urban sewer network maintenance requirements. After multiple rounds of technical evaluation and commercial negotiations, Chengli Special Purpose Vehicle Co., Ltd. delivered six units of the EHY5045TWCE6 sewage treatment vehicle, with a total contract value of approximately RMB 2.7 million (unit price ~RMB 450,000 per unit, consistent with local procurement practice), covering four key drainage zones in the city. This article uses this case as a reference, analyzing it from four dimensions—tender requirements, winning technical specifications, reasons for continued collaboration, and frequently asked questions—to provide procurement entities with an evidence-based, practical analysis. I. Procurement Background and Requirements Analysis Wuxi is located in the core area of the Taihu Lake Basin. With accelerating urbanization, pressure on sewer network maintenance has increased year-on-year. At the end of 2025, the municipal sanitation department launched the tender, with primary requirements as follows: • Treatment Capacity: Minimum daily processing capacity of no less than 80 m³, suitable for wastewater treatment at municipal discharge outlets, septic tanks, and post-pipeline dredging operations. • Discharge Standards: Must comply with Grade B requirements of the 'Water Quality Standard for Wastewater Discharged into Urban Sewer Systems' (GB/T 31962–2015). • Chassis Compatibility: Requires a chassis with 3,308 mm wheelbase (corresponding to Dongfeng light-duty chassis) to facilitate operations in narrow urban alleys. • After-sales Support: Must provide a 2-year or 100,000-km warranty, plus a commitment to 24-hour emergency response. According to publicly available tender information, the budget cap was RMB 3.449 million, with 5–7 units planned for procurement. Chengli won the bid with a proposal for six units (~RMB 450,000/unit), offering outstanding cost-effectiveness. II. Technical Specifications of the Winning Model: EHY5045TWCE6 The EHY5045TWCE6 sewage treatment vehicle is a certified model developed by Chengli specifically for lightweight municipal applications (Announcement No.: CLW5045TWCE6, sourced from Chengli’s internal product database). Its core specifications are as follows: | Item | Parameter | Notes | |------|-----------|-------| | Chassis Model | Dongfeng EQ1045SJ3CDF | 3,308 mm wheelbase, optimized for urban operations | | Engine Power | 85 kW (~115 hp) | China VI emission standard, compliant with Wuxi’s environmental regulations | | Sewage Tank Capacity | 3.5 m³ | Based on official announcement data; suitable for routine maintenance volumes | | Treatment Capacity | ≥80 m³/day | Achieved via separation + disinfection process | | Separation System | Screw extrusion + stacked screw dewatering | Solid-liquid separation efficiency ≥95% | | Disinfection Method | UV + chlorine tablet hybrid | Ensures effluent compliance | | Curb Weight | ~4.5 tons | Compliant with Blue Plate license (Class C driver’s license) requirements | | Emission Standard | China VI | Eligible for nationwide registration and annual inspection | Key competitive advantages enabling this model’s success in the tender included: (1) full regulatory certification—no additional modifications required for registration; (2) use of Dongfeng chassis (nationwide warranty network), ensuring controllable maintenance costs; and (3) transparent configuration—no bundled pricing, allowing procurement entities to verify each functional component individually. III. Core Reasons for Continued Collaboration Following the initial delivery in 2026, the municipal sanitation department ordered two additional units of the same model within the subsequent four months (bringing its total fleet to eight units). Key reasons for sustained cooperation include: 1. Performance Stability and Operational Suitability After deployment of the first batch