I. Project Background and Key Tender Requirements In 2025, the Urban Management Bureau of a district in Weifang City launched a procurement project for a CN6-compliant Dongfeng sewage treatment vehicle with a 3308 mm wheelbase to enhance urban sewage treatment capacity. According to publicly released tender information, the budget was capped at approximately RMB 332,000, requiring the vehicle to feature suction, separation, filter-pressing, and self-unloading capabilities—primarily for emergency treatment of sewage from municipal pipelines, septic tanks, and river channels. Key technical specifications stipulated in the tender documents are as follows: Chassis: Dongfeng series, CN6 emission standard, 3308 mm wheelbase, equipped with a Yuchai 140 hp engine or equivalent power unit. Tank Capacity: Minimum 3 m³, fitted with a high-capacity vacuum pump (suction rate ≥60 m³/h). Sewage Treatment Capacity: Solid-liquid separation capability, treatment capacity ≥15 m³/h, equipped with either a plate-and-frame filter press or a screw-type sludge dewatering device. Self-Loading/Unloading Function: Hydraulic rear cover opening/closing mechanism; tank tilting angle ≥45° for efficient unloading. Other Requirements: Equipped with gravity-feed valve, discharge valve, observation window for sludge level, suction hose, and overflow alarm system; overall vehicle dimensions must comply with urban road traffic standards. The project requirements were clearly defined, mandating suppliers to submit comprehensive technical response proposals and commercial quotations, along with commitments to localized after-sales service. II. Chengli’s Technical Response Proposal Chengli Special Purpose Vehicle Co., Ltd. submitted a technical proposal for the sewage treatment vehicle based on its official model CLW5070GSSD6, fully aligned with the tender requirements. The vehicle utilizes a Dongfeng chassis with a 3308 mm wheelbase, powered by a CN6-compliant Yuchai 120 hp engine (actual output: 88 kW—meeting the tender’s power requirement). The tank offers an effective capacity of 3 m³ and is equipped with a water-ring vacuum pump delivering a suction rate of 60 m³/h. Its solid-liquid separation system employs a plate-and-frame filter press, achieving a treatment capacity of 15 m³/h. Overall vehicle dimensions measure 5995 × 2000 × 2600 mm—fully compliant with urban road traffic restrictions. Key technical highlights include: • High-Efficiency Separation: Stainless-steel filter plates in the plate-and-frame filter press reduce sludge moisture content to ≤70% after dewatering, enabling direct transport or disposal. • Intelligent Control: Integrated liquid-level sensors and overflow alarm systems prevent excessive intake that could damage the vacuum pump. • Self-Unloading Mechanism: Hydraulic rear cover actuation enables a 50° tank tilt angle; combined with a gravity-feed valve, unloading is completed in under 5 minutes. • Chassis Reliability & Support: Dongfeng chassis covered by nationwide warranty; superstructure supported by Chengli’s lifetime service commitment, with spare parts shipped within 24 hours. Additionally, Chengli emphasized in its technical response that this model holds complete official certification (Announcement), is eligible for registration and annual inspection nationwide, and has been successfully delivered to multiple municipal clients—including 10 units of 5 m³ water-sprinkling trucks to Henan’s sanitation department and 4 units of cleaning/suction trucks to Sichuan’s municipal authorities—all utilizing similar Dongfeng chassis configurations, thus validating proven reliability. III. Commercial Quotation Strategy In the commercial quotation phase, Chengli adopted a 'direct factory sales, transparent configuration' strategy. Based on 2026 tax-inclusive landed pricing references, standard 3 m³ suction/sewage treatment vehicles typically range between RMB 105,000–133,000. However, considering the additional integration of the plate-and-fra