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Treatment method of river or lake sediments

A treatment method and technology for sludge, which can be used in dewatering/drying/concentrating sludge treatment, oxidation treatment of sludge, etc., and can solve the problems of large treatment capacity, increased treatment cost, and large environmental risks.

Inactive Publication Date: 2014-10-01
袁锐 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of alkaline chemicals in this technology, the pH value of the filtrate is around 12, which cannot be discharged directly. It needs to be neutralized by adding a large amount of acid and discharged. At the same time, the dehydrated mud cake is also alkaline. It causes certain difficulty to its follow-up recycling and harmlessness, therefore, it has greater environmental risk; and the amount of dosing in this method is large, resulting in a large amount of follow-up treatment and increasing the treatment cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Provide the river channel sediment to be treated, the mixed liquid sludge concentration (MLSS) is measured to be 88160mg / L, the coarse particles in the river channel sediment are removed by gravity sedimentation, and then the obtained river channel sediment is mechanically stirred The ozone aeration conditioning treatment is carried out under the conditions, the mass content of the added ozone is 15mg / kg DS, and the conditioning treatment time is 2min; then 0.025% polyacrylamide is added to it for polymerization and precipitation, and the obtained mixed material is pumped To the filter press for pressure filtration, the pressure filtration feed pressure is 0.8MPa, to obtain a mud cake with a moisture content of less than 50%.

[0040] The water content of the mud cake detected by the present invention is 27.90%, and the mud cake obtained by the method provided by the present invention can be directly and comprehensively utilized, realizing the reduction, harmlessness and...

Embodiment 2

[0043] Provide the river channel sediment to be treated, measure its MLSS to 90010mg / L, use the method of swirling flow for sedimentation treatment, and separate the sand with larger particles;

[0044] Under the condition of mechanical stirring, add ozone to the bottom mud from which sand and stones have been removed for conditioning treatment, the mass content of ozone added is 50mg / kg DS, the conditioning treatment time is 5min, and the conditioning treatment product is obtained;

[0045] The obtained conditioned product is mixed with iron-based flocculant for coagulation treatment, and the mass fraction of iron-based flocculant added is 0.04%; then the obtained mixture is sent to a filter press through a sludge pump for press filtration, The filter feed pressure is 0.8MPa, and a mud cake with a moisture content of less than 50% is obtained.

[0046] The water content of the mud cake detected by the present invention is 28.5%, and the mud cake obtained by the method provide...

Embodiment 3

[0049] Provide the lake sediment to be treated, and measure its MLSS to be 83056mg / L, settle it by gravity sedimentation, and separate out the sand with larger particles;

[0050] Under the condition of mechanical stirring, hydrogen peroxide was added to the bottom mud from which sand was removed for conditioning treatment, the mass content of hydrogen peroxide added was 5 mg / kg DS, the conditioning treatment time was 15 minutes, and the conditioning treatment product was obtained;

[0051] Mix the obtained conditioned product with an aluminum-based flocculant for coagulation treatment. The mass fraction of the added aluminum-based flocculant is 0.035%; The filter feed pressure is 0.8MPa, and a mud cake with a moisture content of less than 50% is obtained.

[0052] The water content of the mud cake detected by the present invention is 27.95%, and the mud cake obtained by the method provided by the present invention can be directly and comprehensively utilized, realizing the re...

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Abstract

The invention provides a treatment method of river or lake sediments. The treatment method comprises the following steps: (a) removing gravel from the river or lake sediments; (b) mixing the gravel-free sediments obtained in the step (a) with an oxidant for conditioning the sediments to obtain a conditioned product; (c) mixing the conditioned product obtained in the step (b) with a flocculant for coagulation treatment; (d) performing pressure filtration on the sediments subjected to the coagulation treatment. According to the method, the pH values of sediment cakes obtained by treating the sediments with the method provided by the invention as well as residual water, tail water and the like generated in a treatment process are 7, the content of suspended substances (SS) in the water is relatively low, the content of ammonia nitrogen, total nitrogen and total phosphorus is reduced, the waste water and the tail water can be directly discharged back, the obtained sediment cakes can be directly utilized, environmental harm cannot be caused, and relatively high environmental protection values are achieved.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a treatment method for river or lake bottom sludge. Background technique [0002] River or lake sediment is usually a mixture of clay, silt, organic matter and various minerals, which is deposited on the bottom of the water body after long-term physical, chemical and biological actions and water transportation. With the development of the economy and the acceleration of the industrialization process, a large amount of domestic sewage and industrial wastewater without proper treatment are directly discharged into the river, causing a large amount of pollutants to be deposited in the river sediment. In order to prevent the pollutants in the river sediment from being released to the The water body will cause secondary pollution of the water body, and the bottom sediment of the polluted river should be dredged. [0003] In the existing technology, environmental dredging of ...

Claims

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Application Information

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IPC IPC(8): C02F11/06C02F11/12C02F11/14
Inventor 李志光姜良军张继峰李明松刘海林
Owner 袁锐
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