In the municipal sanitation sector, sewage treatment vehicles are critical for pipeline clearing, sludge removal, and obstruction clearance. However, many older models—due to non-compliant emissions, low treatment efficiency, and high maintenance costs—have become major operational challenges for grassroots units. This article details the procurement case of three EHY5045TWCE6 sewage treatment vehicles (3308 mm wheelbase) by a municipal sanitation department in Baoding City, tracing the full process from identifying pain points of aging equipment and conducting model selection research to Chengli’s tailored solution and successful delivery—providing practical reference for peer procurement decisions. I. Pain Points of Aging Equipment: Low Efficiency, Frequent Failures, and Non-Compliant Emissions A municipal sanitation department in Baoding City is responsible for pipeline maintenance and sewage cleanup across multiple urban districts. Its existing fleet comprises several China IV–emission-standard sewage treatment vehicles purchased prior to 2018. With tightening environmental regulations and increasing operational demands, these vehicles’ shortcomings have become increasingly acute. • Non-Compliant Emissions: China IV vehicles are prohibited from operating in certain restricted zones, impeding emergency response times. • Low Treatment Efficiency: Outdated models rely on conventional vacuum pumps with slow suction speeds, resulting in prolonged single-operation cycles—especially problematic during peak rainy-season workloads, often requiring overtime. • High Failure Rate: Hydraulic systems and sealing components frequently fail, driving up maintenance costs; annual repair expenses for some units exceed 30% of their original purchase price. • Complex Operation: Absence of intelligent control systems necessitates highly experienced operators to ensure job quality, significantly extending training periods for new staff. The department head stated at an internal meeting: “During flood season, aging vehicles repeatedly break down and operate inefficiently—disrupting residents’ travel. We urgently need a batch of reliable, efficient, and eco-friendly new vehicles.” This directly triggered the current procurement initiative. II. New Requirements Assessment: Defining Technical Specifications and Budget Constraints In early 2024, the department launched a public tender process. According to publicly released tender information, the procurement involved three sewage treatment vehicles with a 3308 mm wheelbase, requiring compliance with the following core criteria: • Chassis Emission Standard: China VI compliance, fully aligned with the latest environmental regulations, enabling unrestricted operation in all emission-controlled zones. • Tank Capacity: Minimum 3 m³ to meet per-operation volume requirements. • Suction Performance: Vacuum pump airflow rate ≥30 m³/h, plus integrated automatic discharge system. • Intelligence Features: Equipped with liquid-level display, pressure alarm, and one-touch operation functionality. • Budget Control: Unit cost capped at approximately RMB 136,000–170,000 (per public tender data), inclusive of chassis, superstructure, transportation, and initial operator training. • After-Sales Service: Nationwide chassis warranty; lifetime technical support for superstructure; spare parts delivery within 48 hours. Following the tender announcement, multiple special-purpose vehicle manufacturers submitted bids. Chengli Special Purpose Vehicle Co., Ltd. emerged as a top contender, leveraging its mature product line—the EHY5045TWCE6 model—specifically designed for sewage treatment applications. III. Chengli’s Solution Match: The Technical Strengths of the EHY5045TWCE6 Chengli proposed a comprehensive solution based on the EHY5045TWCE6 model, precisely addressing the department’s requirements. The vehicle features a Dongfeng chassis compliant with China VI emission standards, and a proprietary superstructure de