Integrated construction process of ecological dredging and synchronous sludge dehydrating

Abstract

The invention discloses an integrated construction process of ecological dredging and synchronous sludge dehydrating. The construction process comprises the following steps of construction preparation, ecological dredging and sludge dehydrating. The river bottom is stirred through a reamer system in a dredger to form sludge slurry, a pumping system in the dredger conveys the sludge slurry to a screening device through a conveying pipeline to conduct sludge dehydrating treatment, and the purpose of dredging is achieved. In the construction process, the construction mode of dredging with water is adopted, so that water changing or water source adding is not needed in the dredging process; by means of the sludge dehydrating treatment through the screening device, the solid content of supernatant liquor is low, so that when the supernatant liquor returns back to a river, secondary pollution is avoided; the water content of dehydrated sludge is about 75%, and the dehydrated sludge can be subjected to landfill directly, so that the secondary pollution of the sludge containing a large quantity of sewage on the environment in the outward transporting process and follow-up treating process is avoided and reduced effectively; and compared with a traditional water-drained dredging method, by dredging with the water, damage to river ecology is reduced while the sludge is treated effectively.

Description

technical field [0001] The invention relates to the field of river dredging, in particular to an integrated construction process of ecological dredging and synchronous sludge dehydration. Background technique [0002] With the increase of urban population and the gradual development of industry, a large amount of industrial wastewater, domestic sewage, and garbage are directly or indirectly discharged into urban rivers, making the pollution load of river water far greater than the self-purification capacity of water. Pollutants and garbage are therefore deposited in large quantities. The accumulation of pollutants and garbage (even decades of pollution accumulation) has led to a sharp deterioration of the water quality of most rivers in the city (many of which are inferior to Class V water quality), and the river sediments are black and smelly. A large number of organic and inorganic pollutants deposited in the bottom mud lead to a sharp decrease in dissolved oxygen in the ...

AI Technical Summary

Problems solved by technology

[0004] (1) It is necessary to build dams and cofferdams: it is easy to cause river bank collapse, and the construction method is subject to regional or climatic restrictions. For example, it cannot be constructed during the flood season. The construction needs to integrate the overall regulation and coordination of the river and drainage issues;

[0005] (2) The impact of construction on the surrounding environment of the river: the silt is broken up by artificial water, and then pumped to the tanker for shipment, or dredged by an excavator, which will pollute the surrounding environment. Construction machinery and equipment will affect the embankment, green belt, and landscape of the river bank. , roads and other public relations facilities caused damage;

[0006] (3) Construction method: It needs to rely on a lot of manpower to flush, disperse, and pump sludge. The construction efficiency is extremely low. There is a contact surface between the construction personnel and the sludge. There is a large amount of harmful and toxic gases in the sludge with water, and the construction process is extremely unsafe. ;

[0007] (4) Construction process and management: A large number of construction methods rely on manpower, multi-point operations, not a process-based operation method, the dredging effect cannot be guaranteed, and construction management is not easy;

[0008] (5) Sludge removal method: There is no dehydration process for sludge removal. The sludge removed is actually the mud containing a large amount of water after manual water flushing. It is pumped into the mud truck and then transported away. There are still a lot of mud in this method. Sewage, transportation costs are high; there is a risk of secondary pollution to the environment during the transportation process (the phenomenon of leakage and leakage is often emitted); the follow-up treatment of water-containing sludge is difficult, and the risk of secondary pollution to the environment is high, and random dumping will cause unloading. The groundwater source in the surrounding environment is seriously polluted; the cost of subsequent sludge harmless disposal is high (because there is still a large amount of sewage);

[0009] (6) Destruction of ecology: The traditional method drains the river, causing pollution to the surrounding environment, and the ecological environment and balance of the river and lake are continuously damaged. The consequences are often algal blooms and fish deaths

Images