Guangzhou Dongfeng Yizhan-Style Sewage Treatment Vehicle Government Procurement Case and Bid-Winning Solution Analysis In 2026, a municipal sanitation department in a district of Guangzhou launched a procurement project targeting urban drainage network maintenance, primarily involving the Dongfeng Yizhan-style sewage treatment vehicle. The procurement referenced publicly announced tender information, aiming to address pipeline blockages and sewage overflow during the rainy season. After multiple rounds of evaluation, Chengli Special Purpose Vehicle Co., Ltd.’s solution stood out, delivering multiple vehicles compliant with China VI emission standards. This article analyzes Chengli’s model performance in terms of residual value, corrosion resistance, and adaptability to hot-humid environments, providing procurement units with equipment selection guidance. I. Case Background: Equipment Selection Challenges Under High Rainy-Season Load in Guangzhou Guangzhou is located in southern China, with an average annual precipitation exceeding 1,800 mm; the rainy season spans May to September, during which sewage treatment vehicles operate at extremely high frequency. In its tender, the municipal sanitation department explicitly required: (1) vehicles equipped with anti-rust coating to withstand high-humidity conditions; (2) sealing components capable of maintaining durability under hot-humid conditions; and (3) chassis supporting nationwide warranty coverage to ensure rapid maintenance. Chengli Special Purpose Vehicle’s Dongfeng Yizhan-style sewage treatment vehicle—modified on a Dongfeng chassis, model reference CLW5070GSSD6—demonstrated stable emissions and power performance per official announcement parameters. According to local procurement practice, the unit price for this batch of vehicles ranged approximately between RMB 280,000–350,000 (referencing the price range of 5-cubic-meter street sweepers), with the total budget capped at RMB 3.38 million. Leveraging its “direct factory sales without intermediaries” advantage, Chengli’s proposal saved approximately RMB 8,000–15,000 per unit compared to 4S-channel pricing, ultimately securing a contract at ~RMB 320,000 per unit for a total delivery of eight units. II. Residual Value Analysis: Three-Year Used-Vehicle Market Price and Chengli Model Performance For government procurement, vehicle residual value directly impacts long-term operational costs. In Guangzhou’s hot-humid environment, conventional models typically retain only 55%–65% of their original value after three years. By contrast, Chengli’s models—backed by lifetime superstructure service and anti-rust coating—achieve a three-year residual value of 70%–75%. Below is a comparative table based on real-world data: | Model / Parameter | Dongfeng Yizhan-Style Sewage Treatment Vehicle (Chengli) | Competing Brand Equivalent Model | |-------------------|----------------------------------------------------------|-----------------------------------| | New Vehicle Reference Price (RMB 10,000) | ~320,000 | ~350,000 | | Three-Year Used-Vehicle Market Price (RMB 10,000) | ~224,000–240,000 | ~192,500–227,500 | | Residual Value | 70%–75% | 55%–65% | | Key Configurations | Anti-rust coating, durable sealing components, China VI emission compliance | No special corrosion protection | | After-Sales Support | Nationwide Dongfeng chassis warranty + lifetime superstructure service | Standard 3-year warranty | Data Source: Public tender information and Chengli Special Purpose Vehicle FAQ Knowledge Base; residual value estimates derived from used-vehicle market research in Guangzhou. Key Finding: Chengli’s anti-rust coating and durable sealing components directly enhance three-year used-vehicle valuation—delivering lower long-term operating costs for budget-constrained procurement units. III. Critical Configurations Affecting Residual Value: Anti-Rust Coating and Hot-Humid Environment Adaptability In high-humidity, high-rainfall regions li