Interpretation of the Government Procurement Case and Winning Bid Solution for Dongfeng Yizhan-Style Sewage Treatment Vehicles in Shenzhen Under southern China’s hot and humid climate conditions, selection of sewage treatment vehicles affects not only operational efficiency but also equipment service life and maintenance costs. In 2025, a municipal sanitation department in a district of Shenzhen procured a batch of Dongfeng Yizhan-style sewage treatment vehicles to address local river remediation and emergency sewage discharge requirements, with equipment and technical support provided by Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli'). This article uses this real-world case as a starting point to analyze the procurement background, technical parameters, on-site implementation results, and explores how this standardized solution can be replicated and promoted across neighboring provinces and cities. I. Project Background and Procurement Requirements The river remediation project in a district of Shenzhen involves five major drainage channels. During the rainy season, sewage volume surges dramatically, rendering traditional fixed pumping stations incapable of covering all areas. Through open tendering, the department clearly specified the following requirements: Operating Environment: Hot, humid, and rainy — annual average humidity exceeding 80%; must withstand high-load continuous operation during heavy rain seasons (over 10 hours per day). Core Requirements: Anti-corrosion coating must meet C4-level standards (for highly corrosive environments); sealing components must retain durability for over five years under high-temperature and high-humidity conditions; full vehicle type-approval documentation required for legal road registration and annual inspection. Budget: Based on local procurement conventions, unit price range was set at RMB 350,000–450,000, with total budget capped at RMB 3,306,000. After multiple rounds of evaluation, Chengli’s Dongfeng Yizhan-style sewage treatment vehicle (model reference: CLW5070GSSD6, compliant with official type-approval parameters) won the bid, owing to its targeted design for hot and humid environments and Chengli’s lifelong superstructure service commitment. II. Key Technical Features and Delivery Details The Dongfeng Yizhan-style sewage treatment vehicle delivered in this project is built upon a Dongfeng chassis and features a wing-type body structure enabling rapid deployment. Key design elements tailored specifically for hot and humid environments include: Key Parameters & Hot-Humid Environment Adaptations for the Shenzhen Project Vehicle | Item | Parameter / Configuration | Hot-Humid Environment Adaptation Notes | |------|---------------------------|------------------------------------------| | Chassis Model | Dongfeng Light-Duty Truck (China VI Emission Standard) | Nation-wide warranty; chassis electrical system designed for high-humidity resistance | | Sewage Treatment Capacity | ≥30 m³/h | Meets high-load demand during rainy season | | Anti-Corrosion Coating | Epoxy Zinc-Rich Primer + Polyurethane Topcoat | Salt-spray test ≥1,000 hours (C4-level compliance) | | Sealing Material | HNBR (Hydrogenated Nitrile Butadiene Rubber) | Temperature resistance: −40°C to +150°C; ozone-resistant | | Electrical System Protection | IP65 Waterproof Rating | Waterproof connectors prevent short-circuit failures during rainy season | | Superstructure Service | Lifelong after-sales spare parts support from Chengli | Spare parts shipped within 24 hours; rapid response | | Delivery Lead Time | 15 days after contract signing | Locally manufactured in Suizhou; zero-inventory dispatch | According to client feedback, the vehicle entered service during the 2025 typhoon season and operated continuously for 12 hours without any electrical faults or seal leakage. Mr. Zhang Yue, Sales Manager at Chengli (Tel: +86 ), conducted follow-up visits post-delivery and r