A method for comprehensive utilization of water body sediment reduction and resource utilization

A sediment and resource utilization technology, applied in chemical instruments and methods, inorganic chemistry, phosphorus compounds, etc., can solve the problems of secondary hazards of heavy metals, difficult dehydration of water sediments, low utilization rate of resources, etc. The effect of increasing, increasing the reaction rate and reducing the moisture content

Active Publication Date: 2017-01-11
TIANJIN YIMING ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the drawbacks of existing disposal technologies such as difficult dehydration of water body sediments, high cost, low resource utilization rate, and secondary hazards of heavy metals, etc. Method for comprehensive utilization of organic components and inorganic components after detoxification

Method used

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  • A method for comprehensive utilization of water body sediment reduction and resource utilization

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The bottom mud taken from a certain reservoir has a moisture content of 94.8%. Sodium hypochlorite solution is added thereto to make the available chlorine content in the bottom mud of the reservoir 2.01 mg / g TSS. The reservoir sediment after dosing is sent to the integrated air flotation and sedimentation machine, and the generated floating mud enters the collection tank, and the sand is dehydrated by physical pressing to obtain decemented sand with a moisture content of 57.6%, and the dewatered filtrate enters the reaction tank. Regularly detect the pH of the water in the air flotation and sedimentation machine. When the pH rises to 8.2, the water is discharged into the reaction tank and mixed with the dehydration filtrate.

[0031] The heavy metal content in the decemented sand was sampled and tested, and the test results are shown in Table 1. The leaching toxicity of heavy metals is up to the standard, and it can be used as humus, roadbed materials or pavement brick ...

Embodiment 2

[0040] The remaining sludge from the municipal sewage treatment plant has a water content of 76.1%, and H2 o 2 Finally, it is sent to the integrated air flotation and sedimentation machine, and the generated floating mud enters the collection tank, and the sand is dehydrated by physical pressing to obtain decemented sand with a moisture content of 38.2%, and the dehydrated filtrate enters the reaction tank. After a period of time, the pH of the water in the air flotation and sedimentation machine rises to 8.5. At this time, the water is discharged into the reaction tank and mixed with the dehydration filtrate.

[0041] The heavy metal content in the decemented sand was sampled and tested, and the test results are shown in Table 3. The leaching toxicity of heavy metals meets the standard, and it can be used as humus, roadbed materials or pavement brick aggregates.

[0042] Measure the concentration of phosphate in the reaction tank to be 376mg / L, add waste brine in the reaction...

Embodiment 3

[0050] The remaining sludge taken from an industrial sewage treatment plant has a moisture content of 87.5%, according to 3kg / m 3 After the amount of sludge is added to potassium ferrate, it is sent to the integrated air flotation and sedimentation machine, and the generated floating mud enters the collection tank, and the sand is dewatered by physical pressing to obtain decemented sand with a moisture content of 43.4%, and the dewatered filtrate enters the reaction tank. After a period of time, the pH of the water in the air flotation and sedimentation machine rises to 8.0. At this time, the water is discharged into the reaction tank and mixed with the dehydration filtrate.

[0051] The heavy metal content in the decemented sand was sampled and tested, and the test results are shown in Table 5. The leaching toxicity of heavy metals meets the standard, and it can be used as humus, roadbed materials or pavement brick aggregates.

[0052] Measure the concentration of phosphate i...

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Abstract

The invention belongs to the technical field of treatment of polluted water body sediments and particularly relates to a reducing and recycling comprehensive utilization method for water body sediments. In order to solve the technical problems of difficult dehydration, high cost, a low recycling utilization rate, heavy metal secondary harm, and the like of the water body sediments, the method is characterized by adding an oxidant into the water body sediments to improve dehydrating performances of the water body sediments, and physically squeezing in a combined manner to obtain dehydrated mud and sand after separating organic and inorganic components, thereby realizing reducing water body sediments; under a weak alkaline condition, taking guanite granules as a crystal seed to be re-added into a reaction tank, thereby increasing a reaction rate and easily obtaining relatively pure guanite crystals; recycling floating sludge rich in organic substances and filtrate with nitrogen and phosphor recycled as an external carbon source to a sewage treatment system, thereby realizing carbon resource recycling utilization. The reducing and recycling comprehensive utilization method can be used for improving the treatment efficiency of water body sediments and lowering the treatment cost, sufficiently realizing stable solidification of heavy metals in the water body sediments based on reducing, and realizing recycling comprehensive utilization of organic and inorganic components.

Description

technical field [0001] The invention relates to the technical field of sediment treatment in polluted water bodies, in particular to a method for comprehensive utilization of water body sediments by reduction and resource utilization. Background technique [0002] Affected by water sources and discharge sources, a large amount of pollutants are deposited in the water body, and the polluted sediment reacts on the water body, causing a series of joint and compound pollution. While affecting the quality of the water environment, it is more harmful to the health of residents and water Ecological security causes harm, and water pollution and sediment treatment has become one of the most important factors in water environment treatment. Its high moisture content, large volume and other characteristics bring greater difficulties to stacking and transportation. [0003] The traditional water sediment treatment method is to first reduce the volume of sediment by means of concentrati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/06C02F11/00C02F11/12C02F9/14C02F9/04C01B25/45
Inventor 王娟娟王希萌
Owner TIANJIN YIMING ENVIRONMENTAL TECH CO LTD
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