Government Procurement Case and Bid-Winning Solution Interpretation of the Dongfeng Yizhan-Style Sewage Treatment Vehicle in Zibo I. Case Background: Equipment Selection Requirements under High-Load Operations In 2025, a municipal sanitation department (hereinafter referred to as the 'procuring entity') planned to procure a batch of high-efficiency sewage treatment vehicles to address sediment accumulation issues in local rivers and sewer networks. The entity operates under high daily workload conditions, treating over 200 cubic meters of sewage per day, and must also respond to sudden pollution incidents. During preliminary research, the procuring entity prioritized the Dongfeng Yizhan chassis model due to its superior load-bearing capacity and off-road capability, making it suitable for complex operating conditions. According to publicly released tender information, the project budget was capped at approximately RMB 344,000 per unit, with requirements including rapid deployment, automated operation, and low maintenance costs. After multiple rounds of evaluation, Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli') secured the contract based on its competitive pricing and after-sales service advantages, delivering three Dongfeng Yizhan-style sewage treatment vehicles. These vehicles are now actively deployed in local river remediation and municipal pipeline desilting operations. Customer feedback indicates stable equipment performance and a failure rate lower than anticipated. This article interprets Chengli’s winning proposal from perspectives such as equipment fatigue management and heavy-duty operational design. II. Equipment Fatigue Management: Addressing Daily High-Load Usage In the sanitation sector, sewage treatment vehicles often operate continuously; thus, equipment fatigue is a core concern for procuring entities. Leveraging certified parameters of models such as the CLW5070GSSD6, Chengli implemented targeted enhancements to the Dongfeng Yizhan chassis: • Chassis Load-Bearing Optimization: Utilizes the dedicated Dongfeng Yizhan chassis with a wheelbase of 3,800 mm, paired with a China VI-compliant engine delivering a maximum power output of 110 kW—balancing performance and fuel efficiency. According to Chengli’s product database, this chassis supports a gross vehicle weight rating exceeding 12 tons, fully meeting the full-load requirements of sewage treatment vehicles. • Superstructure Structural Reinforcement: The tank is fabricated from Q345B high-strength steel with a thickness of 6 mm, offering resistance to corrosion and impact. Critical welds undergo non-destructive testing to ensure crack-free longevity. Per MIIT certification data, the tank volume is designed at 8 m³, conforming to high-efficiency operational standards. • Redundant Automation System Design: Equipped with a PLC control panel supporting one-touch automatic suction/drainage and backflush functions. An integrated fault self-diagnosis module enables real-time monitoring of hydraulic oil temperature, pressure, and other key parameters—minimizing operator-induced fatigue-related damage. Chengli’s after-sales team confirms that the chassis qualifies for Dongfeng’s nationwide original-equipment manufacturer warranty, while the superstructure is backed by lifetime service support and 24-hour direct shipment of spare parts—significantly reducing the procuring entity’s maintenance costs. For further configuration details, please contact the official hotline at or Sales Manager Zhang Yue at . III. Heavy-Duty Operational Design: From Tender Specifications to Real-World Application The procuring entity explicitly stipulated in its tender documents that the vehicle must perform reliably under heavy-duty conditions—including slurry separation, solid-liquid separation, and remote suction operations. Chengli’s winning proposal highlights the following design features: • High-Efficiency Suction System: Fit