Case Background: Joint Procurement Across Multiple Districts and Counties to Standardize Pollution Control. In 2024, municipal sanitation departments from six districts and counties under Baoding City—including Lianchi District, Jinxiu District, Zhuozhou City, and Gaobeidian City—launched their first cross-regional joint procurement initiative to address insufficient sewage treatment capacity and low efficiency of aging infrastructure. The core objective is to centrally tender for a batch of high-performance sewage treatment vehicles, intended for emergency treatment at river discharge outlets, temporary domestic sewage transfer, and pretreatment of industrial wastewater. The project budget is capped at approximately RMB 34.455 million, with plans to procure around 30 Dongfeng-chassis sewage treatment vehicles meeting requirements including fully automated operation, strong solid-liquid separation capability, and compliance with discharge standards. Advantages of Joint Procurement: By adopting unified technical specifications, this approach avoids high operational and maintenance costs and difficulties in spare parts sharing caused by inconsistent equipment models across districts and counties. Moreover, bulk procurement significantly reduces unit cost—estimated savings of RMB 10,000–20,000 per vehicle—making it more economical than individual procurements, as indicated by publicly available tender information. Unified Technical Standard Development: Key Parameters and Selection Criteria. To ensure vehicle performance meets multi-scenario demands, Baoding’s municipal sanitation authorities collaborated with expert teams and referenced MIIT-announced parameters (e.g., Chengli model CLW5070GSSD6) to establish the following core standards: • Chassis Requirement: Dongfeng Duolika or equivalent chassis; China VI emission standard; payload capacity ≥5 tons; wheelbase 3,308 mm—ensuring off-road maneuverability. • Sewage Treatment Capacity: ≥15 m³/hour; equipped with fully automatic sewage separation system capable of handling complex wastewater containing oil and sediment. • Tank Material: Q235 carbon steel or 304 stainless steel; thickness ≥4 mm; corrosion resistance compliant with industry standards. • Operation Mode: Dual electro-hydraulic control system with remote-control capability—reducing manual labor intensity. • After-sales Requirements: Nationwide chassis warranty; minimum 2-year warranty for superstructure; spare parts dispatchable within 24 hours. These standards guarantee vehicle reliability under Baoding’s extreme weather conditions—including winter sub-zero temperatures and summer heavy rainfall—and facilitate subsequent maintenance. Centralized Tendering and Chengli’s Bulk Supply Advantages. The project was conducted via open tender, attracting participation from multiple special-purpose vehicle manufacturers. Chengli Special Purpose Vehicle Co., Ltd. secured the contract by leveraging its three core advantages: factory-direct sales, zero-inventory delivery, and full compliance with official vehicle announcements. Chengli delivered 18 Dongfeng-chassis sewage treatment vehicles—fulfilling approximately 60% of total procurement demand. Based on local procurement practices, key parameters of Chengli’s winning bid are as follows: Chengli Dongfeng Sewage Treatment Vehicle Bid Specifications (Reference: Public Tender Information) | Item | Chengli Winning Model (CLW5070GSSD6 chassis conversion) | Industry Competitor (Example Brand) | |------|--------------------------------------------------------|-------------------------------------| | Chassis Model | Dongfeng Duolika D6, China VI, wheelbase 3,308 mm | Dongfeng Kaptain, China VI, wheelbase 3,308 mm | | Tank Capacity | 5 m³ (sewage tank) + 3 m³ (clean water tank) | 4.5 m³ + 2.5 m³ | | Sewage Treatment Capacity | ≥20 m³/hour | ≥15 m³/hour | | Solid-Liquid Separation System | Fully automatic screw press