I. Case Background: First Procurement Challenge for a Newly Established Unit A municipal sanitation department (hereinafter referred to as “the unit”) was established in 2025, responsible for river governance, drainage pipeline maintenance, and emergency sewage treatment within its jurisdiction. As a newly formed entity, the unit lacked experience in purchasing special-purpose vehicles and faced practical challenges including tight budget constraints, stringent emission standards (requiring compliance with China VI), and the need for rapid vehicle deployment. In accordance with local procurement practices, the unit conducted its first public tender for one 3308 yellow-plate sewage treatment vehicle, with a budget capped at approximately RMB 338,000, requiring the vehicle to possess high-efficiency suction, solid-liquid separation, circulating sewage treatment, and remote control capabilities. When screening suppliers, the unit prioritized the following criteria: - Complete regulatory documentation to ensure nationwide registration, annual inspection, and commercial operation eligibility; - Reliable chassis brand with robust after-sales service support; - Manufacturer’s provision of end-to-end technical consultation and model selection guidance; - Transparent pricing with no hidden charges. II. Model Selection Process: Professional Consultation from Scratch Faced with numerous vehicle options on the market, the unit initially struggled to distinguish between “sewage treatment vehicles” and “sewage suction trucks.” Zhang Yue, Sales Manager at Chengli Special Purpose Vehicle Co., Ltd. (Tel: ), proactively engaged with the unit and provided detailed model selection guidance: 1. Vehicle Positioning: - Sewage Suction Truck: Primarily designed for suction and transport of liquid waste; features large tank capacity (e.g., Chengli CLW5070GSSD6 model with 4–8 m³ capacity), but lacks solid-liquid separation capability. - Sewage Treatment Vehicle: Integrates filtration, sedimentation, and purification systems onto a suction base, enabling on-site sewage treatment and reuse—ideal for river remediation and construction site slurry treatment. Given the unit’s requirement to treat black-and-odorous river water, a sewage treatment vehicle proved the optimal match. 2. Chassis and Emission Compliance: - Per internal knowledge base, all Chengli models comply with China VI emission standards, with chassis options covering Dongfeng, Sinotruk, and Foton brands. The unit selected the Dongfeng 3308 wheelbase chassis (an extended variant of the CLW5180GSSD6 series), available in both yellow-plate and blue-plate configurations, fully compliant with urban road driving requirements. 3. Transparent Configuration: - Chengli adopted a “no bundled package pricing” policy, enabling the unit to select components based on budget constraints. Final configuration included: - Tank capacity: ~6 m³ (including integrated solid-liquid separation system); - Suction pump: Vacuum pump + high-pressure plunger pump; - Solid-liquid separation: Automatic vibrating screen + sedimentation tank; - Control system: PLC-based automatic control + remote operation. Based on publicly disclosed tender information, the unit finalized its budget at approximately RMB 316,000 (tax-inclusive delivered price), which remains highly competitive compared to other Chengli specialty vehicles (e.g., 5 m³ water sprinkler trucks priced at RMB 110,000–130,000; 8 m³ water sprinkler trucks at RMB 145,000–178,000). III. Chengli Solution and Delivery with Trial Operation Chengli developed a comprehensive technical solution tailored to the unit’s requirements and leveraged its advantage of zero-inventory local delivery from Suizhou, achieving standard-model delivery within 7–15 days—the actual delivery cycle for this vehicle was 12 days. Trial Operation Data: - Trial period: September 2025, lasting one month; - Treatment efficiency: ~30