Government Procurement Case and Bid-Winning Solution Analysis for Dongfeng Yizhan-Style Sewage Treatment Trucks in Haikou, Hainan Under Hainan’s hot, humid, and rainy climate conditions, municipal sanitation departments face unique challenges in sewage treatment operations: high-salt-fog corrosion, heavy-load operation caused by frequent torrential rains, and equipment durability on complex road conditions. In 2025, a municipal sanitation department conducted a public tender to procure multiple Dongfeng Yizhan-style sewage treatment trucks; Chenglite Special Purpose Vehicle Co., Ltd. (hereinafter referred to as “Chenglite”) was awarded the contract and delivered the specified vehicle models. Based on publicly disclosed tender information, this article provides an in-depth analysis of the case—examining the reasons behind Chenglite’s successful bid, highlighting key technical features of the selected model, and summarizing best practices for similar projects to serve as a reference for procurement entities. Project Basic Information According to the publicly announced tender notice, this procurement project was initiated by a municipal sanitation department, with a total budget capped at approximately RMB 2.234 million. The scope included five units of Dongfeng Yizhan-style sewage treatment trucks, each priced at around RMB 400,000. Technical requirements stipulated high-efficiency sewage treatment capability, adaptability to Hainan’s high-temperature and high-humidity environment, and compliance with China VI emission standards. Following comprehensive evaluation, Chenglite secured the contract—leveraging Dongfeng chassis advantages, customized anti-corrosion solutions, and comprehensive after-sales service—and delivered the CLW5180GSSD6 model sewage treatment truck (parameters referenced from MIIT official announcements). “We paid particular attention to operational stability during the rainy season. Chenglite’s solution featured targeted design enhancements for anti-corrosion and sealing components—highly aligned with local requirements,” stated the project leader. Analysis of Chenglite’s Bid-Winning Factors Chenglite stood out in this procurement primarily due to the following three factors: 1. Anti-Corrosion Coating Optimized for Humid-Tropical Environments: To counteract Hainan’s high-salt-fog climate, Chenglite applied an enhanced anti-corrosion coating across the upper-body assembly—including the tank, pipelines, and critical connection points—significantly extending equipment service life. Drawing upon prior experience documented in cases such as the “5 water-sprinkler and fog cannon trucks for a Guangdong industrial park,” Chenglite’s accumulated expertise in humid-tropical regions provided strong technical support for this solution. 2. Enhanced Durability of Sealing Components: Frequent rainy-season operations accelerate aging and leakage of sealing components. Chenglite selected specialized high-temperature- and corrosion-resistant rubber seals, validated through simulated humid-tropical environmental testing to ensure no performance degradation after continuous operation exceeding 30 days. Customer feedback confirmed: “After six months of use, the sealing components remain in excellent condition with no signs of leakage.” 3. Nationwide Dongfeng Chassis Warranty + Lifetime Upper-Body Assembly Service: Dongfeng chassis benefit from a nationwide warranty network, while Chenglite offers lifetime service coverage for the upper-body assembly and guarantees direct 24-hour dispatch of spare parts. In remote areas like Hainan, rapid after-sales response is a decisive factor for procurement entities. Chenglite commits to resolving routine faults within 48 hours and delivering urgent parts within 24 hours—a level of assurance significantly surpassing competing vendors. Key Technical Features of the Delivered Model The CLW5180GSSD6 sewage treatment truck delivered in this project offers the following technical advantag