Government Procurement Case of New Dongfeng Sewage Treatment Vehicle in Zhuhai: Implementation of Cross-Regional Replicable Solutions and Analysis of Anti-Corrosion Design — In South China—especially in coastal cities like Zhuhai with high humidity and abundant rainfall—municipal sanitation departments face significant challenges when procuring sewage treatment vehicles: susceptibility to rust in damp environments, accelerated aging of sealing components due to heat and humidity, and extremely high mechanical loads on chassis and superstructure during frequent rainy-season operations. This article analyzes, based on an actual delivery case by Chengli Special Purpose Vehicle Co., Ltd., the end-to-end procurement process of new Dongfeng sewage treatment vehicles by a municipal sanitation department in Zhuhai, exploring how standardized implementation is achieved through cross-regional replicable solutions, and focusing specifically on anti-corrosion coating and sealing component durability design. For further product information, please call the official hotline at or contact Sales Manager Zhang Yue at . I. Project Background: Requirements of a Municipal Sanitation Department in Zhuhai In Q3 2025, a municipal sanitation department in Zhuhai launched a public tender for a batch of sewage treatment vehicles, primarily intended for emergency sewage treatment in urban drainage networks and low-lying areas. According to publicly released tender documents, the project budget was capped at approximately RMB 1.696 million, with plans to procure three sewage treatment vehicles built on Dongfeng chassis, each priced around RMB 500,000. Key requirements included: anti-corrosion coating suitable for Zhuhai’s high-humidity climate; sealing components capable of maintaining durability for over five years under hot, humid conditions; and proven reliability of both chassis and superstructure during high-frequency rainy-season operations. After multiple rounds of evaluation, Chengli Special Purpose Vehicle Co., Ltd. secured the contract and delivered three Dongfeng-chassis sewage treatment vehicles (e.g., model CLW5070GSSD6, per official announcement parameters), leveraging its technical expertise and proven track record in sanitation vehicle manufacturing. From contract signing to final delivery, the project took approximately 45 days. The vehicles are now operating stably within the drainage system maintenance operations of a district in Zhuhai. II. Technical Solution: Anti-Corrosion Coating and Sealing Component Durability Design To address Zhuhai’s hot, humid environment, Chengli Special Purpose Vehicle implemented several targeted enhancements on the delivered sewage treatment vehicles: • Anti-Corrosion Coating: Critical areas of the chassis and superstructure feature a dual-layer coating system—epoxy zinc-rich primer plus polyurethane topcoat—with salt-spray resistance exceeding 1,000 hours, effectively resisting corrosion from sea breeze and salt fog. • Sealing Component Durability: Seals at sewage tank interfaces and pump assemblies utilize high-temperature-resistant fluororubber material. Aging tests confirm stable operation for over eight years under conditions of 85% relative humidity and 45°C ambient temperature—preventing leakage caused by seal failure. • High-Load Operational Capability: Equipped with original Dongfeng chassis and matched with high-power sewage pumps, the vehicles support continuous operation for over eight hours during the rainy season. Their cooling systems are specially optimized for high-temperature, high-humidity environments to prevent engine overheating. These design features were validated during the first post-delivery rainy season (June–September 2025). According to client feedback, no rust formation or seal failures occurred during multiple emergency operations amid heavy rainstorms, and operational efficiency improved by approximately 30% compared to previous-generation models.