Case Background: Flood Season Support Mission of a Municipal Sanitation Department in Ganzhou. In 2023, a municipal sanitation department in Ganzhou launched a procurement plan for specialized vehicles to address increased wastewater treatment demands during the summer flood season and holiday peaks. According to publicly released tender information, the department’s budget was capped at approximately RMB 1.699 million, with plans to procure two high-efficiency, mobile wastewater treatment vehicles capable of operating on complex road conditions. After multiple rounds of technical and commercial evaluation, the Dongfeng Wing-Opening Wastewater Treatment Vehicle (reference model CLW5070GSSD6) was selected. Chengli Special Purpose Automobile Co., Ltd. delivered two units, which are now operational across multiple key areas in the region. The primary operational tasks for these vehicles include: rapidly relocating and treating wastewater from temporary discharge points during major events such as Spring Festival and National Day; purifying and discharging stagnant water from low-lying areas following heavy rainfall during flood season; and performing emergency maintenance at blockages in aging sewer networks. The customer’s core selection criteria were: compliance with China VI emission standards; proven mobile wastewater treatment capability; low failure rate; and timely, reliable after-sales support. Vehicle Configuration and Uptime Assurance The Dongfeng Wing-Opening Wastewater Treatment Vehicle supplied by Chengli Special Purpose Automobile is built on a Dongfeng chassis (official announcement model CLW5070GSSD6), featuring compact overall dimensions suitable for urban street operations. It integrates an efficient solid-liquid separation system and purification unit, achieving a treatment capacity of approximately 15–20 m³/h—capable of converting wastewater into discharge-compliant effluent rapidly. According to Chengli’s product database (CLW5070GSSD6 specifications), the vehicle features a 5 m³ tank volume, equipped with a self-priming pump and high-pressure cleaning function, enabling fully independent operation—including suction, purification, and discharge. Regarding uptime reliability, the customer reported that during the 2024 Spring Festival support mission, this batch of vehicles operated continuously for over 72 hours without unplanned downtime caused by equipment failure. Chengli provides a lifetime after-sales service commitment for its superstructure systems, while the Dongfeng chassis is covered under Dongfeng’s nationwide warranty program—ensuring consistently high vehicle availability. Mr. Zhang Yue, Chengli Sales Manager (Tel: ), noted that the vehicle’s modular design enables replacement of critical components—such as pumps, valves, and filters—within two hours, significantly reducing maintenance turnaround time. Emergency Fault Response and After-Sales Support During a flood emergency operation in 2024, one Dongfeng Wing-Opening Wastewater Treatment Vehicle experienced minor clogging in its discharge pump. Under Chengli’s lifetime superstructure service policy, the customer reported the issue via the hotline. Chengli’s after-sales team dispatched a new discharge pump assembly directly to the site through its express spare parts delivery channel within two hours, and guided on-site operators through installation remotely. From fault occurrence to full restoration of operations, the entire resolution process took less than four hours—effectively safeguarding continuity of flood control operations. Chengli Special Purpose Automobile has established a dual-layer after-sales assurance system: 'Original-Chassis Manufacturer Joint Warranty + Lifetime Superstructure Service.' For wear-prone components specific to wastewater treatment vehicles—such as sealing rings and filter screens—Chengli maintains ready inventory at its Suizhou manufacturing base, supporting 24-hour direct shipment