Case Study and Bid-winning Solution Analysis of Dongfeng Yizhan-Style Sewage Treatment Vehicle Procurement by Huizhou Municipal Government — In a public tender conducted in 2024 by a municipal sanitation department in South China, the Urban Management Bureau of a district in Huizhou City planned to procure a batch of sewage treatment vehicles for emergency sewer cleaning and treatment operations within its jurisdiction. After multiple rounds of technical and commercial evaluation, Chengli Special Purpose Vehicle Co., Ltd. was selected as the supplier, providing the Dongfeng Yizhan-style sewage treatment vehicle. This article provides an in-depth analysis of the procurement case from perspectives including chassis selection, load-bearing capacity and maneuverability, and maintenance convenience—offering practical reference for similar projects. I. Project Background and Procurement Requirements The Urban Management Bureau of a district in Huizhou City is responsible for urban pipeline maintenance and faces frequent operational challenges such as sewage blockages in aging residential communities and post-rainwater accumulation handling. The original procurement specification required vehicles to meet the following criteria: China VI emission standards; sewage suction and separation capabilities; compact dimensions suitable for navigation through narrow urban alleys; and low operating costs. The budget was capped at approximately RMB 503,000 per unit (in line with local procurement conventions), with a total of two units planned for procurement—resulting in an overall budget of about RMB 1,006,000. During the supplier screening phase, key evaluation criteria included chassis reliability, completeness of upper-structure official certification (as per MIIT announcements), and after-sales service capability. As a leading special-purpose vehicle manufacturer based in Suizhou, Chengli Special Purpose Vehicle stood out in the bidding process thanks to its nationwide warranty coverage for Dongfeng chassis and lifetime service support for upper-structure assemblies. According to client feedback, two Dongfeng Yizhan-style sewage treatment vehicles were delivered, model CLW5110TWCD6 (referencing official MIIT announcement parameters), at a unit price of approximately RMB 420,000 (based on publicly available tender information). II. Chassis Selection Analysis: Comparative Evaluation of Dongfeng, Sinotruk, Foton, and FAW One of the core decision points in this procurement was chassis selection. Sewage treatment vehicles typically operate on urban roads, narrow alleys, and even construction sites—imposing specific requirements on chassis load-bearing capacity, maneuverability, and ease of maintenance. Below is a comparative analysis of the four major domestic chassis brands—Dongfeng, Sinotruk, Foton, and FAW—in the context of sewage treatment vehicle applications. Chassis Brand | Representative Model | Load-Bearing Capacity (Reference) | Maneuverability (Wheelbase / Turning Radius) | Maintenance Convenience | Applicable Scenarios Dongfeng | Dongfeng Dorica D6 (same platform as CLW5070GSSD6) | 3–5 ton class, suitable for medium- and small-sized sewage treatment vehicles | Wheelbase: 3,308 mm; turning radius approx. 6.5 m—ideal for narrow urban alleys | Nationwide Dongfeng chassis warranty; extensive service network and readily available spare parts | Urban pipelines, residential communities, industrial parks Sinotruk | Sinotruk Howo | 5–8 ton class, suitable for large-scale sewage treatment vehicles | Wheelbase ≥3,800 mm; relatively larger turning radius | Extensive Sinotruk service network, though slightly less comprehensive in southern China | Main arterial roads, large-scale construction sites Foton | Foton Ouman | 3–5 ton class, comparable to Dongfeng | Wheelbase: 3,360 mm; excellent maneuverability | Broad Foton service network, but compatibility with special-purpose vehicle bodywork components is average | Urban sanitation, light-load op