Government procurement case of EHY5045TWCE6 sewage treatment vehicle in Hangzhou: Analysis of efficiency improvement and cost optimization solutions. As a highly developed city in the Yangtze River Delta, Hangzhou faces heavy urban drainage and sewage treatment demands. In 2024, an environmental maintenance unit of a subdistrict in Hangzhou (hereinafter referred to as 'Hangzhou Subdistrict') procured one EHY5045TWCE6 sewage treatment vehicle manufactured by Chengli Special Purpose Vehicle Co., Ltd. through government procurement procedures. This model is built on a Dongfeng chassis, fully compliant with China VI emission standards, features complete official announcements, and is eligible for nationwide registration, annual inspection, and commercial operation. Based on actual operational data, this article analyzes the case across three dimensions—efficiency improvement, personnel optimization, and cost reduction—and interprets the technical considerations embedded in the procurement plan. I. Project Background and Procurement Requirements Hangzhou Subdistrict oversees multiple aging residential communities and industrial parks. Previously, sewage treatment relied entirely on outsourced hauling services, achieving a daily processing capacity of less than 50 m³; during rainy seasons, frequent waterlogging and sewage overflow occurred. In June 2024, the unit initiated its procurement process, with core requirements including: - High corrosion resistance for both body and tank to withstand Hangzhou’s humid, hot, and rainy climate; - Capability for high-frequency, high-load continuous operation during rainy seasons; - Reduction of labor costs, enabling single-operator ('one person, one vehicle') operation; - Budget control within approximately RMB 340,000 (per publicly disclosed tender information). After comprehensive evaluation, Chengli’s EHY5045TWCE6 sewage treatment vehicle was selected. This model features a ~4 m³ tank capacity, a high-power vacuum pump, and an integrated self-priming/self-discharging system. Its official announcement model corresponds to the CLW5040TWC series (per MIIT announcement parameters), and it utilizes a Dongfeng Dorica chassis—ideal for flexible operations on urban branch roads and narrow alleyways within residential neighborhoods. II. Performance Comparison Before and After Deployment To clearly demonstrate efficiency gains, the following table presents key performance metrics after six months of operation (data source: internal operational reports from the unit): | Metric | Before Deployment (Outsourced Hauling) | After Deployment (EHY5045TWCE6) | Improvement | |--------|-----------------------------------------|-----------------------------------|-------------| | Average Daily Sewage Treatment Volume (m³) | 45 | 78 | +73% | | Time per Operation (hours/operation) | 3.5 | 1.8 | -49% | | Monthly Labor Cost (RMB) | ~28,000 | ~8,500 | -70% | | Average Monthly Downtime Due to Failures (hours) | 12 | 3 | -75% | | Annual Maintenance Cost (RMB) | ~15,000 | ~6,000 | -60% | As shown above, after deployment, the average daily sewage treatment volume increased from 45 m³ to 78 m³—a 73% gain. Operation time per cycle decreased from 3.5 hours to 1.8 hours, nearly doubling operational efficiency. This improvement stems from the EHY5045TWCE6’s high suction capacity and automated sludge discharge system, significantly reducing manual intervention. III. Increase in Average Daily Processing Volume: Practical Implementation from 45 to 78 m³ Sewage sources in Hangzhou Subdistrict primarily include: domestic wastewater (60%), catering wastewater (25%), and initial rainwater runoff from industrial parks (15%). Prior to deployment, outsourced hauling required two daily pumping runs, constrained by vehicle scheduling—leading to frequent backlogs during rainy seasons. EHY