Black and odorous water bodies are generally characterized by thick silt accumulation, high organic matter content, concentrated pollutants and poor self-purification capacity, which are key and difficult points in urban water environment treatment. As the core procedure of black and odorous water remediation, dredging directly determines the long-term stability of treatment effects. Different from conventional river dredging, the remediation of black and odorous water bodies puts forward higher requirements for construction accuracy, environmental performance and thoroughness of desilting. This article sorts out four core technical points to provide standardized construction references for the comprehensive treatment of black and odorous water bodies.
1. Accurate Survey and Strict Control of Dredging Depth
The surface silt of black and odorous water bodies is rich in humus, nitrogen and phosphorus pollutants and sediment impurities, serving as the main endogenous pollution source causing water blackening and odor. Underwater detection must be completed before construction to accurately distinguish the polluted silt layer from the original riverbed layer. In line with the principle of "removing only polluted silt and retaining original bottom sediment", construction personnel shall strictly control the dredging depth and avoid over-excavation and blind excavation. This thoroughly eliminates endogenous pollution, protects the riverbed base structure, and prevents persistent water turbidity and irreversible ecological damage.
2. Adopt Closed Cutter-suction Technology to Reduce Water Disturbance
Black and odorous water bodies have fragile water quality. Traditional dry excavation and mechanically disturbed dredging are prone to cause secondary diffusion of pollutants. Remediation projects shall prioritize the closed cutter-suction technology of remote-controlled hydraulic dredging robots. Adopting remote unmanned underwater operation, the equipment uses hydraulic cutters to gently break up hardened black and odorous silt, and realizes integrated crushing, suction and conveying through negative-pressure closed suction of slurry pumps. The whole process causes no large-scale water disturbance, effectively preventing the floating and diffusion of pollutants and stabilizing water quality during construction.
3. Full-process Unmanned Operation to Improve Safety and Construction Accuracy
Black and odorous water areas are prone to produce harmful gases and bacteria, bringing great risks to manual close-range operation. Intelligent remote-controlled dredging equipment realizes man-machine separated operation. Operators remotely control equipment traveling, dredging and positioning on the shore without underwater or confined space operation. The equipment flexibly adapts to shallow beaches, dead corners and narrow tributaries, and conducts precise dredging in heavily polluted local areas, solving the problems of numerous cleaning dead angles and incomplete desilting in traditional dredging methods.
4. Harmless Silt Disposal to Avoid Secondary Pollution
Black and odorous silt features high pollutant concentration and cannot be stacked randomly. All dredged silt is centrally transported to the disposal area through closed pipelines, and subjected to sedimentation, dehydration, purification and deodorization before compliant transportation or resource recycling. Meanwhile, supporting measures such as water stability maintenance, aeration oxygenation and water purification are implemented to rapidly improve water body appearance and consolidate dredging and remediation effects.
Summary
The core of dredging for black and odorous water remediation lies in precision dredging, low-disturbance construction, safe operation and harmless disposal. The refined construction of intelligent hydraulic dredging robots can efficiently eliminate endogenous pollution, avoid secondary pollution and reduce construction safety risks, thoroughly solving problems such as river blackening, odor and silt blockage. It has become a mainstream technical solution for long-term governance and ecological restoration of urban black and odorous water bodies.
