Procurement case of Dongfeng D6 blue-plate sewage treatment vehicle by a municipal sanitation department in Hebei Province: Analysis of efficiency improvement and cost optimization solutions. Against the backdrop of increasingly stringent environmental protection policies, urban sewage treatment has become one of the key tasks for municipal sanitation departments. To enhance small-scale sewage treatment capacity within its jurisdiction, a municipal sanitation department in Hebei Province conducted multiple rounds of market research and tendering processes, ultimately selecting the Dongfeng D6 blue-plate sewage treatment vehicle (model reference: CLW5070GSSD6) manufactured by Chengli Special Purpose Vehicle Co., Ltd. This article provides an in-depth interpretation of the case from perspectives including pre- and post-deployment data comparison, daily operational volume increase, personnel configuration optimization, and reduction in operating costs — offering reference for similar procurement decisions. I. Case Background and Procurement Requirements Previously, the unit primarily relied on conventional vacuum trucks and temporary pumping equipment for sewage treatment, encountering issues such as low operational efficiency, slow response times, and high labor costs. The current procurement objective was clearly defined: to acquire a blue-plate vehicle permitted for urban road use, with high-efficiency sewage treatment capability, intended for routine cleaning and emergency response at locations including septic tanks, stormwater inlets, and sewage pipelines within its jurisdiction. Through open tendering, Chengli Special Purpose Vehicle’s Dongfeng D6 blue-plate sewage treatment vehicle (Dongfeng chassis with Chengli-manufactured superstructure) won the bid at an approximate unit price of RMB 150,000–180,000 (based on publicly available tender information), with an initial delivery of two units. The vehicle complies with China VI emission standards, possesses complete official certification, and is eligible for standard registration and annual inspection. II. Pre- and Post-Deployment Data Comparison Below is a comparative table compiled by the procuring entity based on actual operational data collected three months after vehicle deployment (data source: user feedback): Comparison Indicator Existing Equipment (Conventional Vacuum Truck + Manual Labor) Chengli Dongfeng D6 Blue-Plate Sewage Treatment Vehicle Improvement/Optimization Rate Daily Operational Volume (cubic meters) Approx. 15–20 Approx. 35–45 ~100% increase Time per Operation (hours) Approx. 3–4 Approx. 1.5–2 ~50% reduction Required Personnel per Shift (persons) 4–5 2–3 ~40% reduction Monthly Operating Cost (RMB ten thousand) Approx. 1.2–1.5 Approx. 0.6–0.8 ~45% decrease Emergency Response Time (minutes) Approx. 60–90 Approx. 20–30 ~66% reduction Failure Rate (occurrences/month) Approx. 2–3 Approx. 0.5–1 ~60% decrease (Note: Data sourced from actual user feedback provided by a municipal sanitation department; for reference only.) III. Daily Operational Volume Increase and Operational Efficiency Analysis Prior to deployment, the unit utilized conventional vacuum trucks (tank capacity approx. 3–5 m³) combined with manual pumping equipment, achieving a maximum daily sewage treatment volume of only 15–20 m³ — further constrained by limited maneuverability in narrow streets. In contrast, the Chengli Dongfeng D6 sewage treatment vehicle features a compact, agile blue-plate design enabling access to older residential communities, alleys, and other areas inaccessible to conventional vehicles. Its integrated high-efficiency sewage separation system supports simultaneous suction and discharge, significantly shortening each operational cycle. In practice, the vehicle achieves a daily operational volume of 35–45 m³ — representing approximately a 100% increase. For example, when cleaning a septic tank with a capacity of approximately 20 m³...