In-depth interpretation of the government procurement case and winning bid proposal for the Xuchang 3308 sewage treatment vehicle EHY5045TWCE6. As urban sewage treatment demands continue to rise—particularly in scenarios such as aging residential communities, industrial parks, and temporary emergency flood drainage—a lightweight, efficient, and rapidly deployable sewage treatment vehicle has become an essential requirement for municipal sanitation departments. In 2025, a municipal sanitation department in Xuchang launched its '3308 Sewage Treatment Vehicle Procurement Project' and ultimately selected Chengli Special Purpose Vehicle Co., Ltd.’s model EHY5045TWCE6. This article analyzes the case from perspectives including operational scenarios, fleet availability, fault emergency response, and procurement cost, aiming to provide practical reference for sanitation departments nationwide. I. Project Background and Operational Scenarios The procuring entity was the Urban Management Bureau of a district under Xuchang’s jurisdiction, primarily serving 30+ aging residential communities across five subdistricts and two industrial parks within the urban area. Key operational scenarios included: • Septic tank cleaning and sewage transfer: Limited capacity of septic tanks in aging residential communities leads to frequent overflow, requiring regular suction and transport. • Emergency treatment of combined stormwater and wastewater: During the flood season, accumulated water mixed with sewage in low-lying road sections requires rapid separation and treatment. • Pre-treatment of industrial park wastewater: Wastewater discharged by some small- and medium-sized enterprises must undergo preliminary filtration and sedimentation before being connected to the municipal sewer network. Given the high number of operation sites and narrow access roads, large-scale sewage treatment vehicles cannot navigate effectively. Therefore, the procurement specifications explicitly required a vehicle no longer than 6 meters in overall length, with a gross vehicle weight not exceeding 4.5 tons, and integrated capabilities for suction, filtration, separation, and temporary storage. After multiple rounds of open tendering and technical proposal evaluations, Chengli Special Purpose Vehicle Co., Ltd.’s EHY5045TWCE6 (reference announcement number: CLW5045TWC6) was selected—thanks to its compact body design, highly efficient sewage separation system, and comprehensive after-sales service system—and two units were delivered for pilot operations. II. Fleet Availability Performance of Chengli Vehicles During Critical Missions The performance of these vehicles during two major missions—the Spring Festival period and the flood season in 2025—drew particular attention from the client. 1. Spring Festival 'Thorough Cleaning' Support Mission From January to February 2025, Xuchang conducted a 30-day city-wide environmental cleanup campaign titled 'Welcoming the Spring Festival in Cleanliness.' The district’s Urban Management Bureau deployed both EHY5045TWCE6 sewage treatment vehicles for septic tank cleaning in aging residential communities. According to onboard daily logs: • Operational days: 28 days (2 days suspended due to rain and snow) • Average daily operating duration: 6–8 hours • Average daily sewage processing volume per unit: ~15–20 m³ • Vehicle availability rate: 100% (no breakdowns or unplanned downtime recorded for either unit) Client feedback: 'What makes Chengli’s vehicle most reliable is its ability to sustain high-intensity continuous operation without thermal shutdowns of the hydraulic system or vacuum pump. Moreover, the solid residue after separation exhibits low moisture content, facilitating direct bagging and removal.' 2. Flood Season Emergency Drainage Support Mission In July 2025, Xuchang experienced prolonged heavy rainfall, causing rainwater and sewage backflow in several low-lying industrial parks. Chengli vehicles were urgently dispatched to th