Taiyuan Dongfeng New Sewage Treatment Vehicle Government Procurement Case: In-depth Analysis of Winter Performance and Winning Bid Solution. In northern cities—especially heavy industrial bases like Taiyuan—sewage treatment remains a key challenge for municipal sanitation departments. Issues such as low winter temperatures, hydraulic system freezing, and difficult engine starts frequently cause aging equipment to become inoperable. This article provides an in-depth analysis of how a municipal sanitation department resolved these pain points using the new Dongfeng sewage treatment vehicle, based on Chengli Special Purpose Vehicle’s publicly disclosed winning bid information, offering professional solution insights. I. Pain Points of Aging Equipment: Winter-Induced Challenges In late 2025, a district-level municipal sanitation department in Taiyuan launched a sewage treatment vehicle replacement project. Previously, their aging equipment suffered from three core issues: 1. Difficult Starting: When winter temperatures dropped below –10°C, the vehicle’s engine and hydraulic system often failed to start normally due to low temperatures, delaying emergency operations. 2. Poor Hydraulic Stability: The hydraulic oil in older models thickened at low temperatures, causing sluggish operation of the sewage pump and pipelines—and even posing burst-pipe risks. 3. High Maintenance Costs: Due to the lack of a winter-specific maintenance program, annual repair expenses remained high, driven by freeze-related damage (e.g., cracked components) and clogged oil lines. “Every time a cold front hits, we must preheat the vehicle several hours in advance; sometimes we even resort to heating the fuel tank with open flame—a practice that is neither safe nor efficient,” recalled an on-site operator. These issues directly triggered the demand for new equipment. II. New Requirements Survey: Focus on Freeze Resistance and Stability To address the above challenges, the department issued a tender notice in early 2026, with core requirements centered on three aspects: 1. Freeze-Resistant Starting Performance: Vehicles must start reliably at –20°C and be equipped with preheating systems (e.g., engine preheaters, fuel tank heating systems). 2. Low-Temperature Hydraulic Stability: The hydraulic system must use low-temperature-resistant hydraulic oil and incorporate low-temperature protection valve assemblies to ensure stable operation below –15°C. 3. Winter Maintenance Program: Suppliers must provide a comprehensive winter maintenance manual covering oil change intervals, antifreeze selection, battery maintenance, etc. Per local procurement practices, the budget was capped at approximately RMB 896,000–1,344,000 (based on publicly available tender data), with requirements for high-efficiency sewage treatment capability and compliance with China VI emission standards. III. Chengli’s Solution Match: Dongfeng Chassis + Customized Configuration Among multiple bidders, Chengli Special Purpose Vehicle stood out thanks to its Dongfeng chassis platform and mature sewage treatment vehicle product line. Its proposed solution leveraged a Dongfeng China VI-compliant chassis, integrated with the CLW5070GSSD6 upper-structure unit (per MIIT announcement parameters). Key alignment points include: Chengli Dongfeng Sewage Treatment Vehicle Solution Comparison Table | Comparison Item | Aging Equipment | Chengli New Solution | |-------------------------|---------------------------|-----------------------------------------------| | Chassis Brand | Generic / Outdated Dongfeng | Dongfeng Chassis (China VI Emission Compliant) | | Freeze-Resistant Start | No Preheating System | Standard Engine Preheater + Fuel Tank Heater | | Hydraulic Stability | Conventional Hydraulic Oil | Low-Temp Hydraulic Oil + Low-Temp Protection Valve Assembly | | Sewage Pump Capacity | 10 m³/h | 15 m³/h (per official