In the 2025 sewage treatment vehicle procurement project of a municipal sanitation department in Weinan City, the Dongfeng Yizhan-style sewage treatment vehicle stood out for its high maneuverability and efficient treatment capability. The project required vehicles capable of treating over 100 cubic meters of sewage per day, while complying with China VI emission standards and urban road access requirements. After multiple rounds of technical evaluation and cost-performance assessment, the solution provided by Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli') was ultimately selected. This article provides an in-depth analysis of this case, comparing Chengli’s vehicle with a comparable model from another market brand, offering reference insights for government procurement. Project Background and Requirements Analysis A municipal sanitation department in Weinan City planned to procure two sewage treatment vehicles for emergency cleaning of rainwater inlets and sewage pipelines, as well as on-site sewage treatment within the urban area. According to publicly released tender information, key requirements included: • Treatment Capacity: Minimum hourly throughput ≥15 m³, with continuous operation capability for over 8 hours. • Chassis Requirements: Dongfeng-branded chassis meeting China VI emission standards; wheelbase approximately 3,800 mm, suitable for narrow urban streets. • Superstructure Configuration: Wing-type body design (for convenient maintenance and loading/unloading), equipped with self-priming sewage pumps, sludge dewatering equipment, and chemical dosing systems. • After-sales Service: Nationwide chassis warranty; lifetime service coverage for superstructure; spare parts dispatchable within 24 hours. Similar projects have already been implemented across multiple cities in Shaanxi Province—for example, three Chengli sewage treatment vehicles procured in 2024 by a district urban management bureau in Xi’an City remain stable and reliable in daily operation. The budget for the Weinan project was capped at approximately RMB 443,000 per unit, with an expected unit price around RMB 380,000 (based on local procurement conventions). Comparison Between Chengli’s Solution and a Competing Brand Chengli’s proposal is based on the Dongfeng D9 Dorica chassis (modified from the same platform as model CLW5180GSSD6), featuring a 304 stainless steel tank and equipped with a self-priming centrifugal pump and a screw-type sludge dewatering machine. The benchmark vehicle is a mainstream market brand (hereinafter referred to as 'Brand B'), also using a Dongfeng chassis but with a carbon steel superstructure and a plate-and-frame filter press for dewatering. Below is a comparative scoring table across 10 critical dimensions (maximum score: 10 points): Dimension | Chengli (Dongfeng Yizhan-style) | Score | Brand B | Score 1. Treatment Efficiency (m³/h) | 18–20 (field-tested data) | 9.5 | 15–18 | 8.0 2. Superstructure Material Durability | 304 stainless steel, highly corrosion-resistant | 9.0 | Carbon steel, requiring periodic anti-corrosion treatment | 7.5 3. Body Design | Wing-type configuration—facilitates maintenance and maximizes space utilization | 9.5 | Conventional box-type—maintenance requires component disassembly | 7.0 4. Dewatering Performance (Sludge Moisture Content) | Screw-type dewatering—moisture content ≤75% | 9.0 | Plate-and-frame filtration—moisture content ≤80% | 8.0 5. Operational Convenience | Fully automated electrical control system with remote monitoring capability | 9.0 | Manual + semi-automatic operation | 7.5 6. Regulatory Compliance (Announcement Certification) | Fully compliant with China VI standards; nationwide registration and annual inspection eligibility (e.g., CLW5180GSSD6) | 10.0 | Certain models require verification against local regulatory policies | 8.5 7. Cost-effectiveness (Unit Price ≈ X RMB) | Approx. RMB 380,000 (tax-inclusive delivered price, per public tender refer