Langfang CN6 Dongfeng 3308 mm Wheelbase Sewage Treatment Vehicle Government Procurement Case and Bid-Winning Solution Analysis Amid escalating environmental protection pressures, urban sewage treatment has become one of the core responsibilities of municipal sanitation authorities. Taking a district in Langfang as an example, its street environmental maintenance unit faced challenges in 2025—including low efficiency and non-compliant emissions from aging sewage treatment equipment—necessitating urgent procurement of high-efficiency, energy-saving CN6 sewage treatment vehicles. After comprehensive evaluation and peer recommendations, Chengli Special Purpose Vehicle Co., Ltd.’s Dongfeng 3308 mm wheelbase sewage treatment vehicle was selected. This article analyzes the procurement process, solution advantages, and implementation outcomes based on a real-world case, offering reference for similar requirements. I. Case Background: From “Referral by Existing Customer” to “Order Driven by Reputation” The impetus for this procurement originated from a follow-up visit by Chengli Special Purpose Vehicle to an existing customer in Hebei Province. In 2024, a municipal sanitation department in Langfang learned—through peer referrals—about the stable operation and low failure rate of five water-sprinkling trucks and fog cannons (referencing publicly announced tender information) delivered by Chengli to an industrial park in Tianjin. The department’s head proactively contacted Chengli’s sales manager, Zhang Yue (Tel: ), expressing interest in procuring sewage treatment vehicles. “We previously used equipment from other manufacturers, but experienced frequent repairs and difficulty sourcing spare parts. Upon learning that Chengli offers nationwide chassis warranty and lifetime after-sales service for superstructures, we prioritized them,” the head stated. Following preliminary discussions, Chengli’s team recommended a CN6-compliant sewage treatment vehicle built on the Dongfeng 3308 mm wheelbase chassis—tailored to local sewage volume, road conditions, and budget constraints. This trust chain—where an existing customer referred a new client—proved pivotal to this collaboration. Leveraging its long-standing reputation in the sanitation sector—serving over 500 municipal sanitation units—Chengli stood out among multiple suppliers and successfully delivered the first batch of three units. II. Solution Analysis: Technical Advantages of the Dongfeng 3308 mm Wheelbase Sewage Treatment Vehicle The delivered model is the upgraded CLW5070GSSD6 series by Chengli, with key specifications as follows: - Chassis Model: Dongfeng 3308 mm wheelbase, CN6 emission standard; equipped with Yunnei or Yuchai engine—delivering robust power and high fuel efficiency. - Tank Capacity: Approx. 5 m³; constructed from high-strength stainless steel for superior corrosion resistance and extended service life. - Core Functions: Integrated sewage suction, solid-liquid separation, and purification recirculation—achieving treatment capacity exceeding 20 m³/hour. - Key Features: Standard configuration includes vacuum pump, high-pressure cleaning system, and automatic liquid-level control—ensuring adaptability to complex operating conditions. Per MIIT announcement parameters (e.g., model CLW5070GSSD6), the vehicle meets stringent reliability and regulatory compliance standards, enabling nationwide registration and annual inspection. Chengli’s quoted price—based on publicly announced tender data—ranges approximately from RMB 345,000 to 402,000 per unit, representing savings of about RMB 10,000–15,000 compared to equivalent configurations sourced via 4S dealerships—offering strong cost-performance value. III. Comparative Data: Chengli Solution vs. Conventional Alternatives To clearly illustrate advantages, the table below compares the Chengli Dongfeng 3308 mm wheelbase sewage treatment vehicle against conventional competing solutions, drawing upon actual data