Modularized dehydration method and dehydration system for polluted bottom mud of rivers, lakes, reservoirs and ponds
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A modular technology for polluted sediment, applied in chemical instruments and methods, water/sludge/sewage treatment, biological water/sewage treatment, etc., can solve problems such as large footprint, high infrastructure investment, and difficulty in sustainable application question
Pending Publication Date: 2021-05-14
CCCC TIANJIN ECO ENVIRONMENTAL PROTECTION DESIGN & RES INST CO LTD
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The above method has problems such as long construction period, large floor space, poor environmental protection, etc.
The mechanical dehydration method promotes the endogenous pollution control process of rivers, lakes, reservoirs and ponds due to its small footprint, short construction period, and s
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Embodiment 1
[0036] The present invention takes the Baiyangdian Lake dredging pilot project as an example. The area to be treated is a fish pond of 30 mu. ~50cm, the moisture content of the polluted sediment is 45%~50%, and the dredging volume is 5000m 3 .
[0037] Such as figure 1 Shown, a kind of river, lake, reservoir and pond polluted sediment modular dehydration method of the present invention comprises the following steps:
[0038] S1. Pretreatment of polluted bottom mud: transport the polluted bottom mud of rivers, lakes, reservoirs and ponds to the impurity removal screening machine, and intercept the large solid impurities in the polluted bottom mud (including floating particles in the mud) through the impurity removal screening machine. sundries, domestic garbage, weeds, garbage and particles, etc.), and transfer the solid impurities to the bottom mud consolidation site for storage. machine, wherein the screened mud has a solid content of 5%;
[0039]S2. One-stage concentrati...
Embodiment 2
[0049] On the basis of Example 1, a modularized dewatering system for river, lake, reservoir and pond polluted sediment of the present invention comprises: a pretreatment unit, a primary concentration unit, a secondary treatment unit, a dehydration unit, and a residual water Collection unit, residual water treatment unit and residual water guarantee unit;
[0050] The pretreatment unit includes an impurity removal and screening machine, which is used to screen solid impurities and polluted mud in the bottom mud of rivers, lakes, reservoirs and ponds. The oversize of the impurity removal and screening machine is solid impurities, and the undersize is pollution with high water content. mud;
[0051] The primary concentration unit includes a deep conical thickener and a combined dosing and dissolving device, which are used for mud concentration of high water content contaminated bottom mud. The deep conical thickener and the combined dosing and dissolving device pass through the ...
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Abstract
The invention discloses a modularized dehydration method for polluted bottom mud of rivers, lakes, reservoirs and ponds. The method comprises the steps: sequentially carrying out pretreatment on the polluted bottom mud, carrying out primary slurry concentration, carrying out secondary slurry treatment, carrying out slurry dehydration treatment, buffering and collecting residual water, carrying out physical and chemical treatment on the residual water and carrying out deep treatment on the residual water. The dredged mud is primarily concentrated after being subjected to impurity removal and screening, the solid content of the mud is increased to 15-20% from 1%-5% of that of pretreatment; compared with a traditional sedimentation tank concentration process, the method has the advantages that the mud concentration can be remarkably increased, then secondary dosing treatment is carried out, along with the increase of the mud concentration after primary concentration, and the dosage in the link is reduced by about 20%; ad finally, dehydrating is carrying out to produce solidified soil and residual water, the collected soil is recycled, the residual water is purified by matching with recycling modes such as a baking-free brick process, a greening soil process and the like, and the residual water is discharged to a receiving water body after the residual water meets the discharge requirement. Through multistage treatment in the dehydration method, the dehydration speed of the polluted bottom mud can be integrally accelerated, and the treatment efficiency of the polluted bottom mud is improved.
Description
technical field [0001] The invention belongs to the technical field of river and lake sediment treatment, and in particular relates to a modular dehydration method and a dehydration system for river, lake, reservoir and pond polluted sediment. Background technique [0002] With the acceleration of the construction of ecological civilization in our country, the requirements for water ecological governance are becoming increasingly stringent. Endogenous pollution is an important factor affecting black and odorous water bodies. It is an important measure in the comprehensive improvement of water environment. Environmental dredging is a measure aimed at improving the water environment of rivers and lakes, removing sediment containing pollutants in the water body, blocking pollution sources, and reducing water pollution. Among them, a large amount of removed silt also needs to be properly disposed of, and a large amount of silt is more convenient for environmental protection in ...
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