I. Case Background: Winter Operation Pain Points of a Municipal Sanitation Department in Dalian Dalian is located on the northeastern coast of China, where winter temperatures often fall below -15°C—posing stringent demands on the cold-start performance and hydraulic system stability of sewage treatment vehicles. In 2025, a municipal sanitation department in Dalian (hereinafter referred to as 'the unit') operated three aging sewage treatment vehicles. Due to the lack of freeze-protection design, these vehicles frequently experienced cold-start difficulties, frozen hydraulic lines, and excessively high oil viscosity during winter—resulting in a more than 40% decline in average daily operational output. To improve winter operational efficiency, the unit procured two Chengli 3308 yellow-plate sewage treatment vehicles (equipped with Dongfeng chassis; model reference: CLW5070GSSD6, compliant with official announcement parameters) through government procurement tendering. According to publicly disclosed tender information, the project budget was controlled within approximately RMB 956,000, with a unit price of about RMB 420,000, aiming to ensure operational continuity under low-temperature conditions. Leveraging its local manufacturing advantages in Suizhou, Chengli Special Purpose Vehicle Co., Ltd. completed delivery within 7–15 days. The unit reported: 'After deployment, monthly winter equipment downtime decreased from seven days to less than one day; the hydraulic system remained stable even during real-world testing at -20°C.' This article analyzes the case from multiple dimensions—including pre- and post-deployment performance comparisons, increases in average daily processing volume, optimization of personnel allocation, and reductions in operating costs. II. Pre- and Post-Deployment Performance Comparison: Quantitative Efficiency Analysis To clearly demonstrate the practical effectiveness of the Chengli 3308 yellow-plate sewage treatment vehicle, the table below compares key performance indicators before and after deployment, based on the unit’s operational records from December 2025 to February 2026 (data source: internal statistics from the unit, supplemented by after-sales feedback from Chengli). Indicator | Existing Vehicles (Winter 2024) | Chengli 3308 Yellow-Plate Vehicle (Winter 2025) | Improvement ---|---|---|--- Average Daily Sewage Treatment Volume (tons) | ~8 tons | ~15 tons | +87.5% Cold-Start Success Rate at -15°C | ~60% | ~98% | +63.3% Average Monthly Equipment Downtime Days Due to Failures | ~7 days | ~1 day | -85.7% Personnel Required per Operation | 4 persons | 2 persons | -50% Average Monthly Operating Cost (RMB ten-thousand) | ~60,000 | ~35,000 | -41.7% Hydraulic System Response Time (seconds) | ~15 seconds (under low temperature) | ~3 seconds | -80% As shown in the table, the Chengli 3308 yellow-plate vehicle delivered significant improvements in winter operational efficiency. Average daily treatment volume increased from ~8 tons to ~15 tons—directly attributable to its freeze-resistant cold-start system and low-temperature hydraulic stability design. The unit’s director stated: 'In the past, we could only serve several residential communities per day during winter; now we can cover the entire district—doubling our efficiency.' III. Core Advantages: Detailed Explanation of Freeze-Resistant Cold-Start Performance and Low-Temperature Hydraulic Stability Given Dalian’s harsh winter climate, procurement stakeholders prioritized low-temperature performance. The Chengli 3308 yellow-plate sewage treatment vehicle (based on the CLW5070GSSD6 official announcement model) features targeted optimizations in the following areas: Freeze-Resistant Cold-Start System: Equipped with a low-temperature start-assist system—including glow plugs and a low-temperature battery—to ensure engine startup within five seconds at -25°C.