Government Procurement Case and Bid-Winning Solution Analysis of the Huanggang Dongfeng Yizhan-Style Sewage Treatment Vehicle In the municipal sanitation sector, the operational efficiency and regulatory compliance of sewage treatment vehicles directly impact environmental governance outcomes. In 2025, a municipal sanitation department in the Huanggang region faced challenges including aging sewage treatment equipment and non-compliant emissions. Through public tendering, it procured a batch of Dongfeng Yizhan-style sewage treatment vehicles. Based on this real-world procurement case—and integrating Chengli Special Purpose Vehicle’s product specifications and delivery experience—this article provides an in-depth interpretation of the solution selection and implementation process. I. Pain Points of Legacy Equipment: Low Efficiency and High Maintenance Costs The department’s existing five sewage treatment vehicles had been in service for over eight years, with the following key issues: • Reduced pumping and discharge efficiency: Aging vacuum pumps extended single-operation time by 30%, resulting in daily processing volumes falling below 60% of design capacity. • Outdated emission standards: Vehicles still met only China III or China IV emission standards, failing to comply with the current China VI environmental requirements enforced in Huanggang—posing rectification risks during annual inspections. • Frequent repairs: Severe corrosion of critical chassis and superstructure components (e.g., tank body and piping) led to total repair expenses exceeding RMB 80,000 in 2024—approximately 15% of the original equipment value. • Excessive operational noise: Noise levels exceeded 85 dB during operation, adversely affecting nearby residents and triggering multiple complaints. These pain points directly impaired the department’s emergency response performance during the 2025 rainy season, creating an urgent need to replace its fleet with high-efficiency, compliant sewage treatment vehicles. II. New Requirements Survey: Emphasizing Compliance and Cost-Effectiveness In March 2025, the department launched a procurement needs survey, with core requirements including: • Chassis and Emissions: Must use a China VI-compliant chassis; Dongfeng brand preferred (leveraging existing service networks); and must feature a wing-type cargo box structure to facilitate equipment inspection and maintenance. • Operational Capability: Tank volume ≥ 5 m³; vacuum pump suction depth ≥ 8 meters; single-operation time ≤ 15 minutes. • Budget Control: Consistent with local procurement practices, unit budget capped at approximately RMB 333,000, with a total budget of ~RMB 1,665,000. • After-Sales Service: Nationwide chassis warranty required; lifetime technical support and spare parts supply for the superstructure. During the survey, the department evaluated proposals from multiple suppliers. Chengli Special Purpose Vehicle ultimately advanced to the shortlist due to its complete official product announcements, short delivery lead times (7–15 days for standard models), and extensive experience serving over 500 municipal sanitation units. III. Chengli’s Solution Match: Dongfeng Wing-Type Chassis with High-Efficiency Superstructure Based on client requirements, Chengli Special Purpose Vehicle recommended the Dongfeng Yizhan-style sewage treatment vehicle (model CLW5070GSSD6, per MIIT announcement parameters). Key highlights of this solution include: 1. Chassis Configuration • Brand: Dongfeng Dorica, China VI emission standard. • Cargo Box: Wing-type structure—opens on both sides—to enable convenient internal equipment inspection and replacement. • Powertrain: Equipped with Yuchai or Chaoyang engine (110 hp), suitable for urban road operations. 2. Superstructure Performance • Tank Volume: 5 m³ (carbon steel construction with anti-corrosion treatment). • Vacuum Pump: Water-circulating type, suction depth ≥ 8 meters; full-tank filling time approx. 10 minutes. • Filt