Government Procurement Case and Bid-Winning Solution Analysis for the Dongfeng Yizhan-Series Sewage Treatment Vehicle in Quanzhou In coastal cities, frequent rainy seasons, high humidity, and complex sewage composition impose stringent requirements on the durability and operational efficiency of sewage treatment vehicles. Recently, a municipal sanitation department in Quanzhou adopted a framework agreement procurement method to procure multiple units of the Dongfeng Yizhan-series sewage treatment vehicle, addressing emergency sewage treatment needs for urban drainage networks and industrial parks. This article analyzes the case from perspectives including the framework agreement background, qualification process, order-triggering mechanism, and Chengli Special Purpose Vehicle’s competitive advantages—supported by real technical parameters and procurement practice—to provide reference for future procurements. I. Framework Agreement Background: Why Choose the Framework Agreement Model? As a southeastern coastal city, Quanzhou experiences prolonged rainy seasons, with an average annual precipitation of approximately 1,200 mm. Typhoon seasons often bring heavy rainfall, causing sudden surges in pressure on urban low-lying road drainage systems and industrial park wastewater infrastructure. As emergency response vehicles, sewage treatment vehicles face intermittent yet unpredictable demand—minimal routine maintenance but intensive usage during storm events. Traditional single-bid tendering methods lack the flexibility required to respond effectively to such fluctuations; therefore, the local municipal sanitation department opted for the framework agreement procurement model. A framework agreement is a procurement approach that pre-defines suppliers and product specifications. According to publicly disclosed tender information, this framework agreement has a validity period of two years, with a total budget ceiling of approximately RMB 4.367 million, covering vehicle procurement, scheduled maintenance, and emergency response services. Key advantages of this model include: once an urgent sewage incident occurs, the procuring entity can issue purchase orders directly under the agreement—eliminating the need for repeated tenders—and achieve response times within 48 hours. II. Qualification Process: Technical Requirements and Selection Criteria During the framework agreement qualification phase, the Urban Management Bureau of a district in Quanzhou issued a technical specification document. Core requirements included: Chassis Requirement: Use of Dongfeng-series chassis, ensuring excellent load-bearing capacity and stability—e.g., chassis structure referenced from model CLW5070GSSD6 (as per official announcement parameters). Dongfeng chassis benefit from an established after-sales service network across coastal regions, facilitating timely maintenance. Sewage Treatment Capacity: Minimum single-operation processing rate of ≥8 m³/hour, equipped with sludge separation and disinfection functions. Corrosion Resistance and Sealing Requirements (Critical): Given Quanzhou’s high-humidity and high-salt-fog environment, the vehicle must feature full-body anti-corrosion coating—especially on sewage tanks, pipe joints, and hydraulic systems. Sealing components must resist hygrothermal aging to ensure no leakage during long-term immersion. High-Load Performance: Rainy-season operation frequency may reach 10–15 hours per day; the vehicle must maintain stable performance under continuous high-load conditions, with no overheating or failure of the engine or pump system. Following open bidding, Chengli Special Purpose Vehicle Co., Ltd. successfully qualified with its Dongfeng Yizhan-series sewage treatment vehicle solution. This model is built upon a Dongfeng chassis, with the superstructure independently designed by Chengli. It holds complete official certifications (e.g., models CLW5180GSSD6), complies with China VI emission standards, and i