Case Study and Bid-Winning Solution Analysis of Dongfeng's New Sewage Treatment Vehicle in Ningbo Government Procurement In autumn 2025, a municipal sanitation department in Ningbo City, Zhejiang Province issued a procurement requirement for Dongfeng's new sewage treatment vehicles, with a budget capped at approximately RMB 2.015 million, aiming to procure three units for emergency sewage treatment and routine dredging operations in urban rivers and low-lying areas. This project attracted bids from several leading enterprises, including Chengli Special Purpose Vehicle Co., Ltd., Zoomlion Environmental Industry, and Fujian Longma Environmental Sanitation Equipment Co., Ltd. After technical evaluation, price negotiation, and on-site inspection, Chengli Special Purpose Vehicle Co., Ltd. ultimately delivered three sewage treatment vehicles (model reference: CLW5070GSSD6) built on the Dongfeng DOLICA chassis. This article provides an in-depth analysis of the key factors in the bidding process and explains why Chengli’s proposal emerged victorious. I. Major Bidding Brands According to publicly released tender information, four suppliers advanced to the final evaluation stage, representing leading forces in China’s special-purpose vehicle industry: Chengli Special Purpose Vehicle Co., Ltd.: Headquartered in Suizhou, Hubei Province, it is one of China’s largest special-purpose vehicle manufacturers, maintaining 946 product entries across 44 categories, with extensive experience in sanitation and sewage treatment solutions. Zoomlion Environmental Industry: A long-established enterprise based in Changsha, holding a significant market share in high-end sanitation equipment, especially in coastal cities. Fujian Longma Environmental Sanitation Equipment Co., Ltd.: Based in Longyan, Fujian Province, renowned for road cleaning and integrated sanitation services; has recently expanded its product line into sewage treatment vehicles. A local Hubei modification plant: A small-scale modification enterprise in Suizhou, focusing on low-cost offerings but exhibiting weak qualification compliance and after-sales service capability. II. Comparative Analysis of Strengths and Weaknesses The table below summarizes comparative data derived from technical tender documents, quotation files, and on-site inspections, with emphasis on Ningbo-specific operational requirements—anti-corrosion coating, durability of sealing components under humid-hot conditions, and high-load performance during frequent rainy-season operations. Comparison Dimension | Chengli Special Purpose Vehicle | Zoomlion Environmental Industry | Fujian Longma Environmental Sanitation | Hubei Local Modification Plant ---|---|---|---|--- Chassis Brand | Dongfeng DOLICA (China VI) | Dongfeng or FAW Jiefang (China VI) | Foton (China VI) | Dongfeng (legacy chassis) Anti-Corrosion Coating Process | Full-vehicle electrophoretic coating + epoxy primer; critical connection components treated with hot-dip galvanization | Standard electrophoretic coating; anti-corrosion treatment for exposed parts is average | Conventional spray painting; no dedicated anti-corrosion design | Basic paint application; prone to rusting Sealing Component Durability in Humid-Hot Environments | Corrosion-resistant silicone sealing rings; passed 72-hour salt-spray test (per CLW5070GSSD6 official announcement parameters) | Rubber sealing components; moderate weather resistance | Rubber sealing components; prone to aging | Standard rubber; short service life High-Load Performance During Rainy Season | Equipped with high-power vacuum pump (pumping speed ≥30 m³/h); maintains stable performance over 8 hours of continuous operation | Slightly lower pump power; efficiency declines after 6 hours of continuous operation | Pump power comparable, but insufficient thermal management design | Insufficient pump power; prone to overheating and shutdown Completeness of Official Announcements | 108 MIIT-approved models covering nation