Interpretation of the Qiqihar Dongfeng New Wastewater Treatment Vehicle Government Procurement Case and Bid-Winning Solution In Northeast China, specialized vehicles face particularly severe challenges under winter low-temperature conditions. Recently, a municipal sanitation department in Qiqihar procured a batch of new Dongfeng wastewater treatment vehicles via public tender, for urban drainage network maintenance and emergency wastewater treatment. The project was ultimately delivered by Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli'), and the vehicles are now operational. This article provides an analysis covering the case background, product selection, cold-weather adaptability solutions, full-range supply advantages, and frequently asked questions. Project Background and Requirements Analysis Qiqihar is located in western Heilongjiang Province, where average winter temperatures range from -20°C to -30°C, with extreme lows reaching -40°C. The primary requirements of this municipal sanitation department include: • Cold-Start Freeze Protection: Vehicles must start quickly at low temperatures to prevent engine or hydraulic system failure due to freezing. • Low-Temperature Hydraulic Stability: Hydraulic oil viscosity increases at low temperatures; stable operation of working components (e.g., wastewater pumps, mixing systems) must be ensured. • Winter Maintenance Plan: Specialized maintenance guidance tailored for frigid regions is required to minimize operational disruptions. • Full-Range Supply Capability: The project also includes a small number of water-sprinkling trucks and vacuum sewage trucks, requiring the supplier to possess integrated delivery capability. According to publicly available tender information, the budget for this batch of vehicles was controlled at approximately RMB 285,000–399,000 per unit (based on pricing of similar projects). Ultimately, the newly launched Dongfeng-chassis wastewater treatment vehicles were selected, with models including CLW5070GSSD6 and other officially certified specifications. As the winning bidder, Chengli provided end-to-end services—from model selection and production to after-sales support. Product Selection and Cold-Weather Adaptability Solutions To address Qiqihar’s extreme cold environment, Chengli implemented targeted configuration optimizations for the delivered new Dongfeng wastewater treatment vehicles. 1. Freeze-Resistant Starting Performance • Engine Preheating System: Equipped with fuel heaters and coolant preheating devices to ensure single-start capability at -30°C. • Battery Upgrade: Installed low-temperature, high-rate batteries paired with battery insulation sleeves to mitigate capacity loss in cold conditions. • Diesel Fuel Grade Adaptation: Users are advised to use -35# diesel during winter, supplemented with anti-gelling additives (Chengli provides matching technical guidance). 2. Low-Temperature Hydraulic Stability • Hydraulic Oil Selection: Synthetic low-temperature hydraulic oil (e.g., HV32 or HV46 grade), with pour point below -40°C, ensuring efficient pump performance. • Hydraulic Line Insulation: Critical hydraulic pipelines fitted with thermal insulation sleeves to minimize heat loss. • Control System Optimization: Integrated hydraulic oil temperature sensors; automatic preheating circulation initiates when oil temperature falls below the preset threshold. 3. Winter Maintenance Plan Chengli provides a 'Winter Maintenance Manual' with each vehicle, covering: draining water before daily shutdown to prevent freezing; scheduled replacement of hydraulic oil and filters; checking battery electrolyte density; and rust prevention treatment for wastewater pumps every 500 operating hours. After-sales teams offer 24/7 response, and direct parts delivery service covers the Qiqihar region (per Chengli’s after-sales policy). Full-Range Supply and One-Stop Procurement Advantages In addition to wastewater treatment vehicles,