I. Scenario Introduction: Addressing Wastewater Treatment Vehicle Selection Pain Points through a Municipal Project in Wuhu — In 2025, a district-level municipal sanitation department in Wuhu urgently needed to procure a batch of CN6-emission-compliant wastewater treatment vehicles for annual environmental protection equipment upgrades, targeting diverse tasks including river dredging, emergency industrial wastewater treatment in industrial parks, and septic tank cleaning in aging residential communities. During the initial phase, the procurement team faced a core challenge: how to select a vehicle capable of handling multiple operating conditions while maintaining low post-purchase maintenance costs — all within a constrained budget (per-unit budget range referenced from publicly available tender information: approximately RMB 205,000–285,000). After extensive research and parameter comparisons, the procurement team ultimately selected Chengli Special Purpose Vehicle Co., Ltd.’s CN6 Dongfeng Wastewater Treatment Vehicle with a 3308 mm wheelbase (model CLW5070GSSD6, chassis-modified). This model was chosen as the winning solution due to its highly versatile chassis, flexible upper-structure configuration, and Chengli’s after-sales service system — comprising nationwide chassis warranty coverage plus lifetime upper-structure service. As of early 2026, the first batch of five units has been stably operating across various districts in Wuhu, with customer feedback highlighting 'low failure rate and user-friendly operation.' This article adopts a 'mission-matched structural approach' to deconstruct three typical operational scenarios involved in this procurement, and recommends corresponding parameters and Chengli’s targeted solutions — offering reference guidance for similar projects. II. Mission-Matched Selection Strategy: Parameters and Configurations for Three Operational Scenarios — Based on actual local requirements in Wuhu, the procurement unit categorized application scenarios into three types: light-duty municipal operations (e.g., septic tank cleaning in aging residential communities, storm drain cleaning), heavy-duty industrial operations (e.g., oily wastewater and chemical sludge treatment in industrial parks), and specialized operations (e.g., river silt dewatering, emergency response). Below are the targeted solutions for each scenario: 1. Light-Duty Municipal Operations: High Maneuverability + Low Energy Consumption — Scenario Description: A municipal maintenance unit in a Wuhu subdistrict is responsible for over 20 aging residential communities where frequent blockages occur in septic tanks and sewage pipelines, requiring frequent entry into narrow alleys. The vehicle must feature a compact body, small turning radius, and rapid suction/discharging capabilities. Recommended Parameters: Based on the Dongfeng 3308 mm wheelbase chassis, overall vehicle length should be kept under 6 meters, with tank capacity recommended at 3–5 m³. According to Chengli’s database, the CLW5070GSSD6 model’s official announcement specifies an effective tank volume of 3.25 m³ and is equipped with a high-power vacuum pump (pumping speed ≥60 m³/h), making it well-suited for this scenario. Chengli’s Targeted Solution: Chengli offers a blue-plate 5 m³ wastewater treatment vehicle (reference price: approx. RMB 98,000–115,000), built on a Dongfeng light-duty truck chassis with a 3308 mm wheelbase; the rear axle ratio is optimized to enhance low-speed torque. The upper-structure includes anti-clogging suction pipes and pre-installed high-pressure cleaning interfaces for routine maintenance. Customer feedback: 'The vehicle easily navigates aging neighborhoods, reducing single-operation time by 30%.' Regarding after-sales support, Dongfeng chassis enjoy nationwide warranty coverage, while Chengli provides lifetime upper-structure service and guarantees 24-hour direct shipment of spare parts — ensuring rapid local response in Wuhu. 2. Heavy-Duty I