General Approach

Black-odor water body treatment achieves the fundamental transformation from “black and malodorous” to “clear and clean” through four integrated measures: External Source Interception → Internal Load Control → Water Quality Purification → Ecological Restoration.

Core Technical Routes

① Sewage Interception & Stormwater-Sewage Separation: Pipeline network modifications separate stormwater from sewage flows, intercepting pollution sources at their origin. This represents the fundamental measure for black-odor water body treatment. Applicable to urban built-up areas and combined sewer drainage systems.

② Sediment Dredging & In-Situ Chemical Remediation: Mechanical dredging removes highly contaminated sediment combined with chemical oxidant application to degrade organic matter. Applicable to water bodies with severe black-odor sediment conditions and prominent internal pollution loads.

③ Aeration & Oxygenation with Microbial Enhancement: Artificial aeration elevates dissolved oxygen levels above 4 mg/L combined with dosing of high-efficiency microbial agents, rapidly eliminating anaerobic conditions. Applicable to emergency treatment and mid-reach river enhancement applications.

④ Integrated Equipment Treatment: Modular equipment systems including magnetic coagulation, MBR, and BAF provide rapid purification. Applicable to urban black-odor river channels with limited land availability and urgent treatment timelines.

⑤ Ecological Floating Islands & Constructed Wetlands: Plant root uptake + microbial biofilm degradation + substrate adsorption. Applicable to long-term ecological purification in downstream river reaches and landscape enhancement zones.

⑥ Hydraulic Regulation & Flow Circulation: Pump stations and gate operations regulate water movement, eliminating stagnant zones and improving hydrodynamic conditions. Applicable to dead-end tributaries and black-odor river sections with poor water mobility.

Key Considerations

Black-odor water bodies result from complex, multi-source contributing factors. Reliance on any single technology rarely achieves long-term compliance. A systematic treatment approach of “Pipeline Network First + Internal Load Management in Parallel + Ecological Restoration as Foundation” is recommended: prioritize sewage interception projects to reduce external loading, simultaneously implement sediment remediation to eliminate internal pollution, and complement with ecological restoration to establish aquatic plant communities.

The treatment period typically requires 1 to 3 years. Following stable water quality compliance, continuous operation, maintenance, and monitoring remain essential to prevent rebound.