Case Study and Bid-winning Solution Analysis of the EHY5045TWCE6 Sewage Treatment Vehicle (3308 Chassis) Procured by Ganzhou Municipal Government In 2024, a municipal sanitation department in Ganzhou publicly tendered for a batch of compact sewage treatment vehicles to meet operational requirements at urban sewage treatment stations and septic tank cleaning needs in older residential communities. After multiple rounds of bidding and comprehensive technical and commercial evaluation, Chengli Special Purpose Vehicle Co., Ltd.’s EHY5045TWCE6 model (3308 chassis) was selected as the winning supplier. A total of six units were ordered, with an overall budget of approximately RMB 1.814 million (based on publicly disclosed tender information). This article uses this case as a starting point to conduct an in-depth analysis of volume selection criteria, daily processing capacity calculations, and the underlying procurement logic behind the winning solution—offering valuable reference for similar municipal projects. For detailed configuration specifications or tender documentation, please contact Chengli Special Purpose Vehicle’s official hotline: , or Sales Manager Zhang Yue at (WeChat ID same as phone number). I. Case Background: Why Choose the 3308-Chassis Sewage Treatment Vehicle? A municipal department in Ganzhou is responsible for sewage treatment across more than 30 residential communities, five sewage lift stations, and three agricultural and sideline markets. Conventional vacuum suction trucks feature large tank capacities but lack solid-liquid separation capability, resulting in high transportation costs and non-compliant discharge. In contrast, the EHY5045TWCE6 sewage treatment vehicle (3308 chassis) integrates “solid-liquid separation + wastewater purification” technology, enabling on-site treatment and reducing transport trips by over 50%. Its chassis is based on Dongfeng’s 3308 mm wheelbase, delivering a compact overall footprint ideal for narrow urban alleys and confined spaces. According to official technical specifications (model EHY5045TWCE6), the tank capacity is approximately 3.5 m³, equipped with a 50-meter suction hose and high-pressure flushing system, achieving a daily treatment capacity of roughly 80–120 m³. Following on-site inspections, the procuring entity confirmed that Chengli’s production base in Suizhou maintains a “zero-inventory delivery” capability—standard models can be delivered within 7–15 days—and offers nationwide original-equipment manufacturer (OEM) chassis warranty coverage plus lifetime after-sales support for the superstructure, fully meeting government requirements for reliability and service assurance. II. Volume Selection: How to Choose Among 3 m³, 5 m³, 8 m³, and 12 m³ Models? In government procurement, tank volume selection is central to balancing budget constraints and operational efficiency. In the Ganzhou project, the procuring entity initially evaluated 3 m³, 5 m³, and 8 m³ models before ultimately selecting the 3.5 m³ EHY5045TWCE6. Below is a volume-selection guideline derived from Chengli’s product database and real-world deployment experience: • 3 m³ (Blue License Plate): Ideal for septic tank cleaning in residential communities and small-diameter sewer manholes; limited operating radius; operable with a Class C1 driver’s license. Reference price for Chengli’s 3 m³ vacuum suction truck: RMB 108,000–136,000 (tax-inclusive landed cost). Daily processing capacity: ~40–60 m³. • 5 m³ (Yellow License Plate): Suitable for urban street maintenance and industrial park applications—striking an optimal balance between capacity and maneuverability. While Chengli’s 5 m³ water tanker retails for ~RMB 111,000–130,000, sewage treatment vehicles—due to their complex onboard equipment—cost ~RMB 147,000–181,000. Daily processing capacity: ~80–120 m³. • 8 m³ (Yellow License Plate): Designed for large-scale sewage treatment plants and municipal pipeline maintenance—de