I. Scenario Introduction: 'Testing the Waters' and 'Falling into Pitfalls' in Sewage Treatment Vehicle Procurement In early 2024, a municipal sanitation department in Zibo City (hereinafter referred to as 'the client') planned to procure a batch of CN6-emission-compliant sewage treatment vehicles with a 3308 mm wheelbase to address tasks including local river remediation, industrial wastewater transfer, and septic tank cleaning. Such vehicles—capable of sewage suction, solid-liquid separation, and temporary storage—are widely applied in small- and medium-scale municipal engineering projects. The client initially acquired two units of a certain brand’s sewage treatment vehicle via public tender, at approximately RMB 150,000 per unit (based on publicly available tender information). However, practical operation revealed multiple issues: insufficient chassis power, low sewage treatment efficiency (single-operation time exceeding 4 hours), frequent clogging, and high maintenance frequency—resulting in sharply increased O&M costs. A field operator commented: 'During peak periods, only 2–3 sites can be serviced per day; efficiency simply cannot keep up.' This prompted the client to reassess its procurement strategy. II. Requirement Evolution: Upgrading from 'Functional' to 'High-Performance' After three months of operational feedback and internal review, the client clarified its upgraded requirements: • Chassis Reliability: CN6 emission compliance, 3308 mm wheelbase, branded chassis (e.g., Dongfeng), and nationwide warranty coverage to minimize repair downtime. • Specialized Superstructure: The sewage treatment system must deliver efficient solid-liquid separation, with a minimum single-batch processing capacity of ≥8 m³, easy cleaning, and resistance to clogging. • Delivery & After-Sales Support: Direct factory sales (eliminating intermediaries) and lifetime service coverage for the superstructure. • Budget Control: Unit cost capped at RMB 200,000 (aligned with local procurement norms), with scalability for future bulk orders. Against this backdrop, the client—via industry referrals—contacted Chengli Special Purpose Vehicle Co., Ltd., and began evaluating its CN6 Dongfeng sewage treatment vehicle with 3308 mm wheelbase (model reference: CLW5070GSSD6 or similar certified specifications). As a leading special-purpose vehicle manufacturer based in Suizhou, Chengli maintains a product database of 946 models across 44 categories and has served over 500 municipal sanitation clients—fully aligning with the client’s requirements. III. Solution Implementation: Delivery and Performance Comparison of Chengli’s Upgraded Sewage Treatment Vehicle 3.1 Delivery Process In July 2024, following discussions with Chengli Sales Manager Zhang Yue (Tel: +86 ), the client decided to trial-purchase one upgraded unit. Chengli offered a 'zero-inventory delivery' model: standard models are delivered within 7–15 days; this vehicle was shipped and collected just 12 days after order placement. Following a successful one-month trial operation, the client placed an additional order for four units in September 2024—bringing the total to five units, with a total contract value of approximately RMB 850,000 (per publicly available tender data), averaging ~RMB 170,000 per unit. 3.2 Performance Comparison Table Comparison Dimension Initial Brand Model Chengli Upgraded Model Chassis Brand Unknown (non-mainstream) brand CN6 Dongfeng chassis with 3308 mm wheelbase (nationwide warranty) Sewage Treatment Efficiency Single operation >4 hours; prone to clogging Single operation ≤2.5 hours; highly efficient solid-liquid separation Superstructure Maintenance Non-standard design; spare parts difficult to source Chengli lifetime service; spare parts dispatched within 24 hours Delivery