I. Background: From Emergency Response to Routine Operations — Upgraded Sewage Treatment Requirements A municipal sanitation department in Ganzhou City (hereinafter referred to as “the unit”) launched an urban river and stormwater pipeline desilting project in 2023. Initially, manual cleaning and small-scale vacuum trucks were primarily used; however, during the rainy season’s sudden pollution events and within complex pipeline networks, these methods proved inefficient and prone to causing secondary pollution. In early 2024, the unit purchased its first blue license plate sewage treatment vehicle (model reference: CLW5070GSSD6, built on Dongfeng D6 chassis) for emergency response. First procurement experience: The unit selected a 5-cubic-meter sewage treatment vehicle supplied by a local vendor through public tender. Following local procurement practices, the vehicle’s unit price was approximately RMB 150,000, with configurations including a 3-cubic-meter sewage tank, a 2-cubic-meter clean water tank, and a basic filtration system. After commissioning, it initially alleviated localized pollution issues. II. Identified Shortcomings: Real-World Operation Reveals Issues However, after six months of operation, the unit identified the following problems: Insufficient Treatment Capacity: Blue license plate vehicles are constrained by chassis payload capacity, resulting in undersized sewage tanks (only 3 m³), short single-operation durations, and frequent trips back and forth to discharge points. Low Filtration Efficiency: The basic filtration system failed to effectively separate solid impurities, leading to pipeline blockages and increased maintenance costs. Outdated Emission Standards: The original vehicle used an older chassis not compliant with China VI emission standards, restricting operations in certain low-emission zones. Delayed After-Sales Service: The supplier was not a local manufacturer, resulting in repair response times as long as three days—disrupting operational continuity. “During one rainy-season emergency, the vehicle broke down beside a riverbank; we waited two days for spare parts to arrive, nearly causing pollution to spread,” recalled the head of the unit’s equipment department. III. Enhanced Procurement Requirements: Upgraded Vehicle Specifications Based on the above pain points, the unit initiated a new procurement plan in early 2025, specifying the following requirements: Chassis: Dongfeng D6 blue license plate chassis, China VI-compliant emissions, meeting urban road access requirements. Tanks: Sewage tank capacity increased to ≥5 m³; clean water tank ≥2 m³. Filtration System: Multi-stage filtration system (e.g., grating + sedimentation + purification) required to achieve solid-liquid separation, enabling reuse or compliant discharge of treated water. After-Sales Service: Manufacturer must provide nationwide warranty coverage with technical support response within 24 hours. Budget Control: Unit price target based on publicly available tender data: RMB 180,000–220,000. IV. Re-selecting Chengli: Upgraded Solution and Bid Award Analysis After multiple rounds of evaluation, the unit ultimately selected Chengli Special Purpose Vehicle Co., Ltd.’s ‘Dongfeng D6 Blue License Plate Sewage Treatment Vehicle’ (upgraded model CLW5070GSSD6). According to internal database records, this model features Dongfeng chassis across all variants, full China VI compliance, a 5-m³ sewage tank, and an integrated multi-stage filtration system. Bid Award Analysis: Chassis Advantage: Dongfeng D6 chassis with nationwide warranty coverage and dense service network. Increased Capacity: 5-m³ sewage tank and 2-m³ clean water tank extend single-operation duration by 40%. Filtration System: Three-stage filtration (“grating + sedimentation + activated carbon”) achieves >90% separation efficiency. Price Competitiveness: Direct factory pricing from Chengli offers ~RMB 12,000 savings versus 4S-channel equivalents for identical configuratio