Government Procurement Case of Dongfeng Yizhan-Style Sewage Treatment Vehicles in Changzhou and Interpretation of Engine Comparison Schemes In the municipal sanitation sector, sewage treatment vehicles serve as core equipment for emergency environmental remediation, industrial park wastewater handling, and urban drainage system maintenance—procurement decisions directly impact operational efficiency and lifecycle costs. Recently, a municipal sanitation department in Changzhou conducted a public tender for Dongfeng Yizhan-style sewage treatment vehicles, with a budget capped at approximately RMB 992,000 and a planned purchase of three units. Based on this case, this article focuses on analyzing the differences among 85 kW / 100 kW / 120 kW engines, provides altitude- and plain-adapted configuration recommendations aligned with Chengli Special Purpose Vehicle’s solutions, and addresses common procurement concerns via an FAQ section. Case Background: Procurement Requirements for Dongfeng Yizhan-Style Sewage Treatment Vehicles in Changzhou This municipal sanitation department is responsible for wastewater transfer and emergency treatment across multiple industrial parks in Changzhou. The vehicle must meet the following core requirements: chassis from Dongfeng; wing-type body design for rapid equipment loading/unloading; upper-body assembly integrating sewage suction, solid-liquid separation, and preliminary purification functions; engine compliant with China VI emission standards, capable of frequent start-stop cycles and intermittent high-load operation under Changzhou’s low-altitude plain conditions. According to publicly released tender information, multiple suppliers responded. Chengli Special Purpose Vehicle Co., Ltd. secured the contract by leveraging its proven expertise in matching Dongfeng chassis and its localized manufacturing advantage in Suizhou, ultimately delivering three Dongfeng Yizhan-style sewage treatment vehicles. Customer feedback highlights excellent performance in operational stability and fuel consumption control. Engine Comparison Analysis: Differences and Fuel Consumption Performance Among 85 kW / 100 kW / 120 kW Options In sewage treatment vehicle selection, engine power directly determines vehicle dynamic response, operational efficiency, and economic viability. Below is a comparative analysis of the three common power configurations, based on Chengli Special Purpose Vehicle’s product database and parameters published in the MIIT Announcement (e.g., model CLW5070GSSD6): | Parameter | 85 kW Engine | 100 kW Engine | 120 kW Engine | |-----------|--------------|----------------|----------------| | Typical Displacement | 2.8 L or 3.0 L | 3.8 L or 4.0 L | 4.5 L or 5.0 L | | Maximum Torque | ~300 N·m | ~400 N·m | ~500 N·m | | Applicable Scenarios | Low-altitude urban areas, light-duty operations | Low-altitude & hilly regions, medium-duty loads | High-altitude or heavy-duty, continuous-operation scenarios | | Fuel Consumption (L/100 km) | 12–15 | 14–18 | 18–23 | | Maintenance Cost | Low (simpler structure) | Moderate | Higher (e.g., turbocharger components) | | Suitable Vehicle Capacity | Special-purpose vehicles < 5 m³ | Special-purpose vehicles 8–12 m³ | Special-purpose vehicles > 15 m³ or specialized variants | | Recommended Configuration | Not recommended (insufficient power) | Chengli 100 kW model (e.g., CLW5070GSSD6) | Only for high-altitude or heavy-duty applications | As shown above, while the 85 kW engine offers the lowest fuel consumption, its torque output is insufficient to drive the pump assemblies and separation equipment mounted on sewage treatment vehicles. The 100 kW engine strikes an optimal balance between fuel economy and power output, making it the mainstream choice for plain-area applications. The 120 kW engine is better suited for high-altitude or continuous high-load operations—but entails significantly higher fuel consumption and acquisition cost. Fuel Consumption Impact on