Case Study and Bid Winning Solution Analysis: CN6 Dongfeng 3308 mm Wheelbase Sewage Treatment Vehicle Procurement by a Municipal Sanitation Department in Dongguan, Guangdong. In humid and hot climates like Dongguan, municipal sewage treatment operations face severe challenges—including frequent rainy seasons, high ambient humidity, and strong corrosivity—placing exceptionally high demands on vehicle anti-corrosion coatings and sealant durability. In 2025, a municipal sanitation department in Dongguan conducted a public tender for sewage treatment vehicles; CLW Special Purpose Vehicle Co., Ltd. successfully delivered four units of the CN6 Dongfeng 3308 mm wheelbase sewage treatment vehicle at an approximate unit price of RMB 280,000 (per publicly available tender information). This article provides an in-depth analysis of this winning bid case from practical application scenarios, cost comparisons, and maintenance strategies. Project Background and Requirements Analysis The client is responsible for maintaining sewage networks and handling emergency response across multiple subdistricts in Dongguan, with high operational frequency and complex working conditions. The tender document explicitly required: compliance with CN6 emission standards; chassis wheelbase no less than 3308 mm; upper-body equipment capable of self-priming, self-discharging, and high-pressure cleaning; and special emphasis on corrosion resistance, sealant durability, and reliability under high-load monsoon conditions. CLW’s Dongfeng 3308 mm wheelbase chassis (model CLW5070GSSD6, per MIIT announcement parameters), paired with a customized upper-body assembly, stood out in the comprehensive evaluation. Fuel-Powered vs. Battery-Electric Version: Cost Comparison and Application Differences Although battery-electric sanitation vehicles are being promoted in certain regions, charging infrastructure remains insufficient in Dongguan, and sewage treatment vehicles operate on irregular schedules—exacerbating range anxiety. Below is a comparative analysis between the fuel-powered version (CN6 Dongfeng 3308 mm wheelbase) and a hypothetical battery-electric version (same tank/capacity): Fuel-Powered vs. Battery-Electric Comparison: Cost and Operational Differences Comparison Item CN6 Dongfeng 3308 mm Wheelbase (Fuel-Powered) Battery-Electric Version (Hypothetical Same Configuration) Purchase Cost (Unit Price) Approx. RMB 280,000 (per publicly available tender information) Approx. RMB 380,000–450,000 (per market reference) Energy Cost per 100 km Approx. RMB 120 (diesel: RMB 7.5/L; consumption: 16 L/100 km) Approx. RMB 60 (electricity: RMB 0.6/kWh; consumption: 100 kWh/100 km) Annual Maintenance Cost (incl. servicing) RMB 8,000–12,000 (incl. engine oil, filters, etc.) RMB 4,000–6,000 (battery servicing, motor maintenance) Charging Infrastructure Requirement No dedicated infrastructure needed; refueling possible at standard gas stations Requires dedicated charging piles or battery-swap stations—unavailable in some Dongguan areas Range & Operational Duration Fuel tank range: 600 km; continuous operation: 8–10 hours Range: approx. 200–300 km; recharge time: 2–4 hours—impacting emergency response capability Applicable Scenarios High-load operations, monsoon-season emergencies, remote areas Fixed urban routes, low-load operations, overnight charging Corrosion Resistance & Sealant Durability CLW standard anti-corrosion coating; sealants certified for humid-heat endurance testing Requires additional custom anti-corrosion treatment—increasing cost As shown in the table, the fuel-powered version demonstrates clear advantages in purchase cost, range, and refueling convenience—especially suitable for Dongguan’s humid, monsoon-prone environment. While the battery-electric version offers lower operating costs, its higher upfront investment, charging inconvenience, and accelerated battery degradation under hot-humid conditions remain significant constraints.