Case Background: Joint Procurement Across Multiple Districts/Counties and Unified Technical Standards. In Q3 2025, two district-level municipal sanitation departments and one county-level environmental maintenance unit under Zhoukou City jointly initiated a procurement requirement for yellow-plate sewage treatment vehicles to address local sewage treatment challenges. According to publicly released tender information, the total procurement budget was capped at approximately RMB 5.64 million, with plans to centrally procure 10 yellow-plate sewage treatment vehicles for urban black-and-odorous water body remediation, industrial zone sewage suction and discharge, and emergency response. During preliminary research, the procuring entities identified inefficiencies and incomplete solid-liquid separation issues with traditional vacuum trucks or cleaning-vacuum trucks when handling complex wastewater; thus, they explicitly required vehicles equipped with integrated 'solid-liquid separation + sewage treatment' functionality and compliance with China VI emission standards. To ensure equipment quality and reduce procurement costs, the three districts/counties jointly established a procurement working group and formulated unified technical specifications. Key parameter requirements included: chassis from Dongfeng or Sinotruk brands; yellow-plate classification (gross vehicle weight approx. 18 tons); effective tank volume ≥8 m³; equipped with a sewage separation system; treatment capacity ≥20 m³/hour; and full compliance with nationwide registration and annual inspection requirements. The working group further emphasized that suppliers must provide complete official announcement parameters (e.g., model CLW5180GSSD6) to ensure regulatory compliance. Centralized Tendering and Chengli’s Bulk Supply Advantages. Following an open tender process, Chengli Special Purpose Vehicle Co., Ltd. secured the contract based on its comprehensive capabilities and solution alignment. Consistent with local procurement practices, this tender employed a 'comprehensive evaluation method', prioritizing vehicle configuration, pricing, after-sales service, and delivery lead time. As a local manufacturer based in Suizhou, Chengli offered zero-inventory shipment and standard-model delivery within 7–15 days—a critical scoring advantage during evaluation. Public tender data indicates the winning vehicle unit price was approximately RMB 480,000, representing savings of RMB 8,000–15,000 per unit versus comparable market offerings—primarily attributable to direct factory sales eliminating intermediary markups. In the bulk supply phase, Chengli’s production capacity advantages were fully demonstrated: all 10 vehicles—from chassis procurement to superstructure modification—were completed and delivered within just 20 days. Each unit featured a Dongfeng chassis (nationwide warranty) and Chengli superstructure (lifetime service), accompanied by complete official announcement parameters to facilitate rapid registration. During acceptance, the procuring party specifically verified the solid-liquid separation system’s treatment efficiency. On-site testing confirmed that each vehicle processed approximately 10 m³ of mixed wastewater within 30 minutes, achieving a solid-phase moisture content below 60%, meeting all predefined performance targets. Comparison Table of Delivered Vehicle Parameters (Based on Actual Case and Chengli Standard Models) Item | Procurement Requirement | Chengli Delivery Solution Chassis Brand | Dongfeng / Sinotruk | Dongfeng (Sinotruk optional) Gross Vehicle Weight | ~18 tons | 18 tons (Yellow Plate) Tank Volume | ≥8 m³ | 8.5 m³ Sewage Separation Capacity | ≥20 m³/hour | 22 m³/hour Emission Standard | China VI | China VI Delivery Lead Time | ≤30 days | 20 days After-Sales Service | Nationwide Chassis Warranty | Dongfeng Chassis Nationwide Warranty + Chengli Superstructure Lifetime Service Reference Unit Price (RMB 10,000)