Government Procurement Case and Bid-Winning Solution Analysis for the National VI Dongfeng 3308 mm Wheelbase Sewage Treatment Vehicle in Linyi City Under current stringent environmental policies, the Urban Management Bureau of a district in Linyi City faces an urgent challenge: severe siltation in drainage networks across multiple old residential communities and urban-rural fringe areas, coupled with insufficient fixed sewage treatment facilities—leading to frequent waterlogging during rainy seasons and sewage overflow. Conventional vacuum suction trucks can only remove liquid waste and are incapable of handling high-concentration sludge or solid-liquid mixtures, resulting in persistently high maintenance costs. To address this, departmental leadership explicitly specified requirements for procuring a specialized vehicle integrating sewage suction, separation, and purification functions—all compliant with China VI emission standards, featuring a stable and reliable chassis capable of operating under complex road conditions. I. Leadership Requirements: Precise Positioning and Budget Control During an internal meeting, leadership emphasized: “We do not need a conventional vacuum suction truck; rather, we require an integrated ‘suction-and-treatment-on-site’ unit to eliminate round-trip transportation costs while ensuring treated effluent meets discharge standards.” Based on local procurement practices, the budget was capped at approximately RMB 342,000, with mandatory full official vehicle announcements enabling normal registration and annual inspection. In internal discussions, the Technical Department highlighted several critical criteria: • Chassis Requirement: A Dongfeng light-duty chassis with a 3308 mm wheelbase—balancing maneuverability and load-carrying capacity. • Functional Requirement: Beyond a standard vacuum pump, the vehicle must incorporate solid-liquid separation and wastewater purification systems. • Emission Standard: Must comply fully with China VI regulations to meet local environmental compliance mandates. • After-Sales Service: Nationwide chassis warranty (Dongfeng OEM) and lifetime service coverage for the superstructure. After multiple rounds of evaluation, Chengli Special Automobile Co., Ltd.’s Dongfeng 3308 mm wheelbase sewage treatment vehicle emerged as a top candidate. This model utilizes an original Dongfeng chassis and adopts the CLW5070GSSD6 modified vehicle configuration—a solution widely adopted in government procurement projects nationwide. II. On-Site Inspection at Chengli’s Manufacturing Facility: From Design Drawings to Physical Validation To verify product capability, a four-member delegation—including leadership, technical staff, and procurement personnel—visited Chengli Automotive Industrial Park in Suizhou, Hubei Province. At Chengli’s production base, the delegation conducted an in-depth tour of the sewage treatment vehicle assembly line. Chengli’s technical team explained: “This vehicle is built upon the Dongfeng 3308 mm wheelbase chassis and features a fully automated control system. Core components include a high-power vacuum pump, a drum-type solid-liquid separator, and a multi-stage sedimentation and filtration unit—delivering a treatment capacity of 20–30 m³ per hour.” The delegation observed a live demonstration using simulated high-concentration sludge water: after suction into the tank, solids were compressed and packaged for discharge, while the purified effluent met direct-discharge standards. A procurement representative immediately asked: “The quoted price is approximately RMB 319,000—about RMB 10,000 lower than local dealers. Does this include freight and registration fees?” Zhang Yue, Chengli’s Sales Manager (Tel: ), responded definitively: “We offer factory-direct pricing—no intermediary markups. Standard models are delivered within 7–15 days; the chassis carries Dongfeng’s OEM nationwide warranty, and the superstructure is covered by lifetime service