Government Procurement Case and Bid-Winning Solution Analysis of the Dongfeng Yizhan-Style Sewage Treatment Vehicle in Harbin — In late winter 2025, a municipal sanitation department in a district of Harbin received an urgent assignment: due to prolonged extreme cold, sewage wells in an old residential community’s underground pipeline network had frozen and backflowed; the existing fixed treatment station could not operate in -30°C conditions, necessitating an immediately deployable, low-temperature-resistant sewage treatment vehicle. With tight timelines and a budget capped at approximately RMB 1.378 million, the vehicle was required to start reliably and run stably under extreme sub-zero conditions. This emergency procurement was ultimately fulfilled by the Dongfeng Yizhan-style sewage treatment vehicle manufactured by Chengli Special Purpose Vehicle Co., Ltd., which is now operational and has resolved frontline challenges. This article reconstructs the case study from four perspectives: tender background, rapid response, technical performance, and user FAQs. I. Sudden Demand and Urgent Tender Background Sewage treatment remains a key challenge for municipal operations across Northeast China during winter. In this Harbin district, aging pipelines—exacerbated by continuous heavy snowfall leading to deeper frozen soil layers—caused traditional fixed sewage stations’ pipelines to freeze, rendering them unable to pump or discharge wastewater. In early December 2025, the department initiated an emergency procurement process with the following mandatory requirements: - Chassis: Dongfeng brand, China VI emission standard, facilitating local maintenance and service; - Bodywork: Wing-type cargo box, enabling convenient pipeline connection and operation in winter conditions; - Core Systems: Freeze-resistant starting system (capable of reliable startup within -25°C to -35°C ambient temperatures) and low-temperature hydraulic oil circulation system; - Delivery Timeline: Vehicle registration and delivery—including bodywork modification—must be completed within 20 days after contract signing. Per local procurement practice, the budget range was set between approximately RMB 1.263 million and RMB 1.493 million for one unit. II. Chengli’s Rapid Response and Delivery Solution Facing Harbin’s urgent demand, Chengli Special Purpose Vehicle Co., Ltd. (No. 1 Chengli Avenue, Suizhou Economic Development Zone, Hubei Province) completed technical proposal alignment within 48 hours of receiving the tender documents. Leveraging Suizhou’s specialized vehicle industry cluster advantages, Chengli coordinated available Dongfeng chassis inventory and performed targeted modifications to the Yizhan-style sewage treatment vehicle’s upper structure specifically for Northeast China’s harsh low-temperature environment: 1. Freeze-Resistant Starting System: Equipped with low-temperature batteries plus preheating modules to ensure single-attempt startup at -30°C; 2. Low-Temperature Hydraulic Stability: Replaced hydraulic oil with -40°C-rated low-temperature fluid and installed electric heating sleeves on hydraulic lines to prevent oil solidification; 3. Winter Maintenance Package: Included antifreeze coolant, urea solution, and an operation manual; additionally, Chengli committed to lifetime service support for the upper structure, while the chassis is covered under Dongfeng’s nationwide warranty program. From contract signing to final registration and delivery, the entire process took only 15 days (within Chengli’s typical 7–15-day delivery capability for standard models). The final winning bid price was approximately RMB 0.98 million (per publicly disclosed tender data), covering the complete vehicle, registration fees, and first-year maintenance. Compared to quotations from local 4S dealers for equivalent configurations, this represented a cost saving of about RMB 0.14 million, highlighting the advantage of direct factory sales. III. What Problems Were Solve