Yantai Dongfeng D6 Sewage Treatment Vehicle (Blue License Plate) Government Procurement Case: Trial-First Approach, Efficient Delivery. In 2025, a district Urban Management Bureau in Yantai, Shandong Province, planned to procure a batch of professional sewage treatment vehicles to address industrial and domestic wastewater challenges within its jurisdiction. During preliminary research, the procurement team faced two core contradictions: first, traditional large-scale sewage treatment vehicles could not access aging neighborhoods and narrow industrial zones; second, budget constraints required balancing cost-effectiveness with long-term operational costs. Ultimately, the procuring entity adopted a 'trial-first' model—introducing one Dongfeng D6 blue license plate sewage treatment vehicle manufactured by Chengli Special Purpose Vehicle Co., Ltd. for a one-month field test to verify performance before deciding on bulk procurement. This article provides an in-depth analysis of this case to serve as a reference for similar procurement projects. I. Procurement Background and Pain Point Analysis As a coastal industrial city, Yantai faces prominent wastewater discharge issues from small- and medium-sized factories, aging residential communities, and street-side commercial establishments. Most conventional sanitation vehicles are yellow-plated models with long body lengths and large turning radii, rendering them unable to enter narrow roads with height restrictions below 2.8 meters or width restrictions below 3 meters. Meanwhile, local environmental protection authorities impose stringent requirements on leakage prevention and odor control during wastewater transportation. After comparing multiple suppliers, the procurement team focused on Chengli’s Dongfeng D6 blue license plate sewage treatment vehicle. Built on a Dongfeng chassis, the vehicle is no longer than 6 meters, operable with a Class C driver’s license (blue plate), and fully compliant with official announcements (e.g., MIIT Announcement Model Series CLW5070), effectively resolving the above pain points. However, adhering to a principle of prudence, the procuring party opted to conduct a trial operation with one unit prior to committing to bulk procurement. II. Trial Phase: Real-World Data Generated by One Vehicle In March 2025, Chengli Special Purpose Vehicle Co., Ltd. delivered the first Dongfeng D6 blue license plate sewage treatment vehicle (specific model based on CLW5070GSSD6 water-sprinkling truck chassis technical specifications, modified for sewage treatment functionality) to the district Urban Management Bureau. The 30-day trial period covered the following key scenarios: Scenario 1: Septic Tank Cleaning in Aging Residential Communities. Equipped with a high-efficiency vacuum pump and separation system, the vehicle processes approximately 3.5 m³ of wastewater per operation, achieving suction speeds ~20% faster than conventional vacuum trucks, while maintaining full enclosure and zero odor emission. In a 30-year-old community in Zhifu District, a single vehicle completed all scheduled septic tank cleaning tasks within just two hours. Scenario 2: Industrial Wastewater Transfer. For oily wastewater from small factories in the Development Zone, the vehicle—fitted with an oil-water separator—achieved effective solid-liquid separation. The clarified effluent met local discharge standards and was directly released into the municipal sewer network, significantly reducing downstream treatment costs. Scenario 3: Emergency Drainage Response. In early April, heavy rainfall caused localized flooding on a certain road section. Deployed as an emergency response unit, the vehicle leveraged its self-priming and self-discharge capability to pump and remove approximately 30 m³ of floodwater within two hours, effectively alleviating urban waterlogging. During the trial period, the vehicle completed around 80 operations, cumulatively treating over 120 m³ of wastewater, with zero mec