Government Procurement Case and Bid-Winning Solution Analysis of the Dongfeng Yizhan-Style Sewage Treatment Vehicle in Urumqi, Xinjiang In Urumqi, Xinjiang, winter lasts up to five months, with minimum temperatures dropping as low as -30°C—posing extreme demands on anti-freezing performance and low-temperature hydraulic stability of sanitation equipment. At the end of 2024, a municipal sanitation department launched a two-year sewage treatment vehicle renewal project, prioritizing the procurement of Dongfeng Yizhan-style sewage treatment vehicles to address emergency urban sewer network operations and operational challenges under severe cold conditions. Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli')—a supplier with extensive experience in Urumqi government procurements—delivered four units of this model, receiving positive feedback from the client. This article analyzes the procurement requirements, configuration solutions, and winter maintenance guidelines based on this real-world case. I. Project Background and Procurement Requirements The Urban Management Bureau of a district in Urumqi is responsible for routine maintenance of the local sewage pipeline network. Its existing equipment is outdated; during winter, frequent shutdowns occur due to hydraulic system freezing or engine starting difficulties. In October 2024, the bureau issued a tender notice for the procurement of four Dongfeng Yizhan-style sewage treatment vehicles, with a budget capped at approximately RMB 2.055 million (based on publicly available tender information). Key requirements included: • Chassis Adaptability: Dongfeng Yizhan chassis, China VI emission standard, suitable for high-cold regions. • Anti-Freezing Start Capability: Engine must start normally within 15 seconds at -30°C. • Low-Temperature Hydraulic Stability: Hydraulic oil must maintain fluidity down to -40°C; the hydraulic system must operate stably at -20°C. • Sewage Treatment Capacity: Minimum daily processing capacity per unit: 80 m³, including solid-liquid separation and disinfection functions. During the tender process, Chengli successfully qualified and ultimately delivered the vehicles, leveraging mature official announcement parameters of models such as CLW5180GSSD6, along with its prior service experience in Urumqi—including previous deliveries of water-sprinkling trucks and vacuum suction trucks. II. Bid-Winning Solution Interpretation: Chengli’s Dongfeng Yizhan-Style Sewage Treatment Vehicle Chengli’s solution is built upon the Dongfeng Yizhan chassis, with an independently designed sewage treatment system installed on the upper structure. Key specifications are as follows (model references include CLW5180GSSD6 and similar officially announced models): | Item | Specification/Parameter | Notes | |------|--------------------------|-------| | Chassis Model | Dongfeng Yizhan | China VI emission standard; equipped with Yuchai or Cummins engine | | Engine Power | 180–210 hp | Suitable for high-altitude and low-temperature environments | | Sewage Treatment Capacity | 80–100 m³/day | Includes grating, sedimentation, and disinfection systems | | Anti-Freezing Start | Electric preheating + low-temperature starting fluid | Startup time ≤15 seconds at -30°C | | Hydraulic System | Low-temperature hydraulic oil (-40°C) | Equipped with heating and thermal insulation devices | | Water Tank Capacity | 8–12 m³ | Meets continuous operation requirements | | Overall Vehicle Dimensions | Approx. 9.3 m × 2.5 m × 3.4 m | Compliant with urban road traffic regulations | | Unit Price (Tax-Inclusive, Delivered) | Approx. RMB 420,000–480,000/unit | Based on publicly available tender information | The core strength of this solution lies in its low-temperature adaptability: the engine is fitted with an electric preheating system; hydraulic lines are wrapped with thermal insulation material; and synthetic low-temperature hydraulic oil is used—ensuring smooth operation eve