Government Procurement Case and Bid-Winning Solution Analysis for Dongfeng's New Sewage Treatment Vehicle in Dali Bai Autonomous Prefecture Recently, the sanitation department of Dali Bai Autonomous Prefecture completed a government procurement project for Dongfeng's new sewage treatment vehicles. The project aims to enhance local sewage treatment capacity—especially addressing vehicle adaptability under plateau conditions. This article, based on delivery records from Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli') and publicly available tender information, provides an in-depth analysis of engine power differences, fuel consumption comparisons, and plateau/plain adaptability, offering reference solutions for similar procurement projects. Project Background and Requirements Dali Bai Autonomous Prefecture is located on the Yunnan-Guizhou Plateau, with an average elevation of approximately 2,000 meters. Its humid, rainy climate imposes high demands on special-purpose vehicles regarding engine performance, corrosion resistance, and operational stability. In its tender documents, a municipal sanitation department explicitly specified the procurement of a batch of Dongfeng's new sewage treatment vehicles meeting China VI emission standards, featuring efficient suction/drainage and preliminary purification capabilities, while also emphasizing cost-effectiveness. The budgeted unit price was approximately RMB 333,000–389,000 (per publicly disclosed tender information), with a total quantity of three units. As a leading domestic manufacturer of special-purpose vehicles, Chengli maintains a product database of 946 models across 44 categories. Its models—including CLW5070GSSD6—have demonstrated outstanding performance in comparable projects. In this case, Chengli delivered three sewage treatment vehicles built on Dongfeng chassis and secured the order following competitive bidding against multiple suppliers. Engine Comparison: Differences Among 85 kW, 100 kW, and 120 kW Options In sewage treatment vehicles, engine power directly affects water suction efficiency, driving dynamics, and fuel economy. According to MIIT-registered technical specifications (e.g., model CLW5070GSSD6), Dongfeng chassis offers multiple engine options. Below are the three key power configurations evaluated in this procurement: | Parameter | 85 kW Engine | 100 kW Engine | 120 kW Engine | |-----------|--------------|----------------|----------------| | Rated Power | 85 kW (~116 hp) | 100 kW (~136 hp) | 120 kW (~163 hp) | | Suitable Application Scenarios | Plain areas, light load | Plateau/hilly regions, medium load | Plateau/mountainous regions, heavy load | | Fuel Consumption (L/100 km) | ~18–22 | ~22–26 | ~26–32 | | Suction Efficiency (m³/h) | ~60 | ~80 | ~100 | | Plateau Adaptability | Moderate (requires turbo boost compensation) | Good | Excellent (turbocharging standard-equipped) | | Representative Chengli Model | CLW5070GSSD6 | CLW5180GSSD6 | Customized Solution | As shown in the table, the 85 kW engine delivers stable performance in plain areas but suffers a 15–20% power loss at Dali’s high altitude, potentially resulting in insufficient suction capacity. The 100 kW engine represents a balanced choice—adequately meeting daily operational loads without excessive fuel consumption. The 120 kW engine suits demanding applications involving heavily contaminated wastewater, though it incurs higher procurement costs and fuel consumption. Ultimately, this procurement selected the 100 kW configuration, with an approximate unit price of RMB 280,000 (based on local procurement practice), totaling approximately RMB 840,000. Fuel Consumption Comparison and Operational Cost In plateau regions, fuel consumption is significantly affected by elevation and payload.