Government procurement case and winning bid solution interpretation for the Baoding Dongfeng Yizhan-style sewage treatment vehicle. Project background: Wastewater treatment equipment upgrade for a municipal sanitation department in Baoding City. In Q3 2025, a municipal sanitation department in Baoding City, Hebei Province, issued a public tender notice to procure a batch of specialized sewage treatment vehicles for emergency cleaning of urban sewer networks, river remediation, and leachate treatment at garbage transfer stations. The project budget was capped at approximately RMB 1.653 million, requiring vehicles with high-efficiency suction, solid-liquid separation, and remote discharge capabilities, while complying with China VI emission standards. Following evaluation, Chengli Special Purpose Vehicle Co., Ltd. won the bid with its Dongfeng Yizhan-style sewage treatment vehicle solution, delivering two units of the CLW5070GSSD6 model—chassis-modified sewage treatment vehicles—with a unit price of approximately RMB 700,000 (based on publicly available tender information). These vehicles were delivered in December 2025 and are now operational across Baoding City. Customer feedback indicates stable performance under complex wastewater conditions, especially suitable for narrow roads in older urban districts. Analysis of Chengli’s Winning Bid Reasons According to the official bid award notice, Chengli Special Purpose Vehicle stood out in this tender primarily due to the following advantages: • Comprehensive and compliant documentation: The CLW5070GSSD6 model (referencing MIIT announcement parameters) carries full China VI emission certification, enabling nationwide registration and annual inspection, fully meeting Baoding’s local environmental policy requirements. • Factory-direct sales with controllable costs: As a manufacturer based in Suizhou, Chengli eliminates intermediaries; compared to 4S-channel pricing for identical configurations, it offers savings of approximately RMB 8,000–15,000, with transparent pricing and no bundled packages. • High compatibility between chassis and superstructure: Dongfeng chassis enjoy nationwide warranty coverage, while Chengli’s superstructure provides lifetime service support and delivers spare parts within 24 hours—ensuring efficient operation and maintenance. • Extensive experience in similar projects: Chengli has served over 500 municipal sanitation agencies—including sanitation bureaus in Henan and municipal departments in Sichuan—with proven track records in vacuum suction trucks and combined cleaning/suction trucks; its technical solutions are mature and reliable. Technical Highlights of the Dongfeng Yizhan-Style Sewage Treatment Vehicle The awarded Dongfeng Yizhan-style sewage treatment vehicle is built upon the Dongfeng DOLICA chassis. Key technical specifications (based on the CLW5070GSSD6 model; actual configuration may vary slightly per procurement requirements) include: • Chassis model: Dongfeng EQ1075SJ3CDF, equipped with a Yuchai 140-horsepower engine, compliant with China VI emission standards. • Tank capacity: Approximately 3.5 m³, fabricated from Q235 carbon steel with anti-corrosion treatment. • Core functions: Fitted with a vacuum suction pump (suction lift ≥ 8 meters), capable of solid-liquid separation; treated wastewater meets discharge standards, while residual solids can be compressed for transport. • Control system: Hydraulic-controlled folding wing-type sealed cover for convenient loading/unloading; electronic control system supports remote monitoring, displaying real-time tank pressure and liquid level. • Application scenarios: Suitable for urban sewer network unclogging, river dredging, and landfill leachate treatment. For the Baoding project, this model was specially customized with a reinforced chassis to withstand low-temperature winter operations in northern China. Customer feedback confirms normal cold-start capability at -15°C, with no reduction in suction