Government Procurement Case and Bid-Winning Solution Analysis for the Foshan 3308 Yellow-Plate Sewage Treatment Vehicle: Practical Selection Under Southern China’s Hot-Humid Operating Conditions In early 2026, a municipal sanitation department in Foshan, Guangdong Province issued a procurement requirement for yellow-plate sewage treatment vehicles, with a budget capped at approximately RMB 398,000. The vehicles were required to deliver high-efficiency sewage purification, excellent corrosion and rust resistance, and reliable performance during frequent rainy-season operations. Following multiple rounds of technical evaluation and on-site inspections, Chengli Special Purpose Vehicle Co., Ltd. secured the contract with its tailored solution and proven expertise in hot-humid southern environments, delivering two units of the 3308 yellow-plate sewage treatment vehicle. Based on this real-world case, this article provides in-depth reference for procuring entities across four dimensions: operational condition matching, technical specifications, solution analysis, and FAQs. Case Background: This municipal department is responsible for maintaining sewage networks across Foshan’s historic urban core and industrial parks. The region experiences an average annual rainfall exceeding 1,800 mm, with hot, humid summers and frequent exposure to acidic/alkaline industrial wastewater in operational zones. Previously deployed vehicles suffered from common issues including tank corrosion, rapid aging of sealing components, and reduced operational efficiency during the rainy season. Consequently, the core procurement requirements focused on: long-term durability of anti-corrosion coatings, extended service life of sealing components under hot-humid conditions, and sustained operational capability during continuous rainy-season use. I. Operational Condition Matching: Selection Logic Across Three Typical Scenarios Based on the operational descriptions outlined in the tender documents, we have broken down the requirements into three distinct scenarios and recommended differentiated configurations accordingly: 1. Light-Duty Municipal Operations: Old Residential Communities and Narrow Alleys Operational Characteristics: Narrow roads, high operation frequency (1–2 times per day), primarily handling domestic sewage and small volumes of oily wastewater. Requires high vehicle maneuverability and short single-operation duration. Recommended Specifications: Reference vehicle—Chengli CLW5070GSSD6-type water sprinkler truck converted into a sewage treatment vehicle (Dongfeng light-duty chassis, gross vehicle weight 7.5 tons), tank capacity approx. 5 m³, equipped with reinforced anti-corrosion coating. However, as this procurement targets yellow-plate vehicles (gross vehicle weight ≥ 8 tons), the actual matched model is a custom-built variant based on the 3308 chassis (wheelbase 3,308 mm), with tank capacity ranging from 6–8 m³. Chengli’s Tailored Solution: Epoxy resin heavy-duty anti-corrosion coating applied to the inner tank surface (resistant to acidic/alkaline environments within pH 3–11); nitrile rubber sealing rings replace standard rubber seals—field testing in Foshan’s local environment (35°C, 90% RH) demonstrated a ~50% extension in service life. 2. Heavy-Duty Industrial Operations: Industrial Parks and Main Sewer Lines Operational Characteristics: Handling oily and chemically contaminated industrial wastewater; tanks must withstand chemical corrosion. Long single-operation distances (10–15 km) demand high chassis load-bearing capacity and upper-body structural stability. Recommended Specifications: 3308 chassis (Dongfeng or Sinotruk options available), paired with a high-power vacuum pump (suction rate ≥ 60 m³/h), tank capacity 8–10 m³, standard stainless-steel valves and piping. Chengli’s Tailored Solution: To address high-chloride-ion wastewater commonly found in Foshan’s industrial parks, Chengli added a polyurea elastomeric coating (thicknes