Hohhot’s EHY5045TWCE6 Sewage Treatment Vehicle (Model 3308): Analysis of a Government Procurement Case and Worksite-Specific Matching Solutions In Hohhot, Inner Mongolia—an energy-intensive industrial hub—sewage treatment faces challenges including widespread, dispersed discharge points and complex wastewater composition. A municipal sanitation department recently procured a batch of compact sewage treatment vehicles to support routine pipeline cleaning, emergency drainage, and pre-treatment of industrial wastewater. Following a public tender process, Chengli Special-Purpose Automobile Co., Ltd. was selected as the supplier for the EHY5045TWCE6 model, with a reference unit price of approximately RMB 380,000–420,000 (based on publicly available tender information). Built on a chassis with a 3,308 mm wheelbase, this model offers high maneuverability and robust treatment capability. As a well-known manufacturer based in Suizhou, Chengli Special-Purpose Automobile maintains full official vehicle announcements (e.g., CLW5040TWC6 series), enabling nationwide registration and annual inspection compliance. Customer feedback indicates stable performance during post-delivery operation (approx. 30-day lead time) in urban drainage network maintenance across Hohhot—particularly when handling high-sediment-content wastewater, where no clogging occurred in the filter screens or pump assemblies, demonstrating its purpose-built design advantages. II. Worksite-Matched Vehicle Selection Strategy Based on Hohhot’s specific operational requirements, demand is categorized into three types: light-duty municipal, heavy-duty industrial, and special operations. Below are key selection criteria and Chengli’s corresponding solutions. 1. Light-Duty Municipal: Routine Pipeline Maintenance & Emergency Drainage Worksite Characteristics: Narrow urban roads; small-diameter drainage pipes (300–600 mm); requirement for high vehicle maneuverability, moderate treatment capacity (10–15 m³/h), and low noise emission to minimize community disturbance. Recommended Specifications: Chassis wheelbase of 3,308 mm (e.g., EHY5045TWCE6); engine power output of ~80–100 kW; maximum treatment capacity of 15 m³/h; equipped with vacuum pump and filtration system. Chengli Solution: Chengli utilizes the CLW5040TWC6-certified chassis, powered by Dongfeng or Foton engines, compliant with China VI emission standards. For light-duty applications, the superstructure features low-noise pump units and an automatic backwash filtration system, minimizing manual intervention. Customer feedback confirms that during an emergency drainage operation on a Hohhot city street, the vehicle processed ~7.5 m³ of wastewater within 30 minutes—meeting expected efficiency targets. 2. Heavy-Duty Industrial: Pre-Treatment of Industrial Park Wastewater Worksite Characteristics: Industrial park wastewater (e.g., from chemical plants or coal mines) contains high levels of oil, suspended solids, and potentially acidic pH values—requiring enhanced pumping capacity and corrosion-resistant materials. Recommended Specifications: Treatment capacity increased to 20–25 m³/h; tank material...