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Sludge heavy metal disposing method in land utilization

A treatment method and technology for heavy metals, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, etc. , to deal with problems such as low content, to achieve the effect of improving overall efficiency and economy, low processing costs, and reducing disposal containers

Inactive Publication Date: 2004-11-10
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The disadvantage of the above method is that the separation of heavy metal extracts and sludge is difficult and the treatment cost is high
The disadvantage of this method is that the solidified sludge cannot be used as soil
However, there is no report on the use of it to deal with the simultaneous presence of multiple heavy metals in sludge with low content and many types.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1: Sampling and analyzing the sludge from a sewage plant in Shanghai. The heavy metal content of the sludge produced by the plant is Zn: 3084, Cu: 864, Ni: 454 (mg / kg).

[0023] Second step: according to the analysis result of the use of sludge, the selection of preparation fixative is sodium sulfide and lime of industrial grade, then weighed by sodium sulfide / lime=1-1.2 weight ratio, then, the two are mixed uniformly, wait use.

[0024] The third step: fixing process: add the above-mentioned fixing agent to the sludge according to 2% weight percentage of the sludge amount, stir evenly, after adding the fixing agent, and then make the sludge harmless (such as fermentation, fertilizer pushing) Treat 5-10 days, finally sampling analysis, the heavy metal content in the sludge after fixing is: Zn: 20.6, Cu: 3.9, Ni: 3.9 (mg / kg), reach the stability that the present invention requires and solidify the heavy metal in the sludge , in line with land use requirements.

Embodiment 2

[0026] Step 1: Sampling and analyzing the sludge from a sewage plant in Shanghai. The heavy metal content of the sludge from this plant is Zn: 1653, Cu: 159, and Ni: 22.2 (mg / kg).

[0027] The second step: according to the analysis results of the sludge, the fixed agent is selected to be potassium sulfide and lime, and then weighed according to the weight ratio of potassium sulfide / lime=0.3, and then the two are mixed evenly and set aside.

[0028] The third step: fixation process: add the above-mentioned fixative to the sludge according to 0.5% by weight of the sludge amount, stir evenly, and after adding the fixative, make the sludge harmless (such as fermentation, fat pushing) Process 3-12 days, the heavy metal content in the sludge after final sampling analysis is fixed is: Zn: 2.621, Cu: 0.312, Ni: 0.271 (mg / kg), reach the stability of the present invention's requirement and solidify the heavy metal in the sludge, Comply with land use requirements.

Embodiment 3

[0030] Step 1: Sampling and analyzing the sludge from a sewage plant in Shanghai. The heavy metal content of the sludge produced by the plant is Zn: 15890, Cu: 3873, Ni: 522.7 (mg / kg).

[0031] The second step: according to the analysis results of the sludge, ammonium sulfide and lime are selected as the fixing agent for preparation, and then weighed according to the weight ratio of ammonium sulfide / lime=2.8, and then the two are mixed evenly and set aside.

[0032] The third step: fixation process: add the above-mentioned fixative to the sludge according to the weight percentage of 15% of the sludge amount, stir evenly, and after adding the fixative, make the sludge harmless (such as fermentation, fat pushing) Process 5-15 days, the heavy metal content in the sludge after final sampling analysis is fixed is: Zn: 30.562, Cu: 12.35, Ni: 5.263 (mg / kg), reach the stability that the present invention requires and solidify the heavy metal in the sludge, Comply with land use require...

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PUM

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Abstract

The invention relates to a process for treating heavy metal in sludge comprising, using sulfides and lime as fixation agent, aligning formula and charging quantity according to the types and content of the heavy metal in the sludge, weighing and preparing fixation agent according to the weight ratio of sulfide / lime = 0.3-3, charging into sludge according to the percentage by weight of 0.5%-20% in the sludge, agitating homogeneously, stabilization treatment for 2-15 days, thus sludge meeting land use requirements can be obtained.

Description

technical field [0001] The invention relates to a treatment process for heavy metals contained in sludge, and further relates to a treatment process for heavy metal pollutants in the sludge when the sludge from urban sewage plants is used on land. Background technique [0002] With the growth of population and the development of industry, domestic sewage and industrial wastewater need to be treated are constantly increasing, and the amount of sludge produced after treatment is also greatly increasing. According to the statistics of relevant departments, at present, the amount of dry sludge produced in my country is about 5 million tons per year. If these huge amounts of sludge are not properly treated and disposed of scientifically, they will not only occupy a large area of ​​land before they can be stacked, but also contain harmful substances. Components such as heavy metals, pathogens and organic pollutants will also migrate or spread in the environme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/14
Inventor 赵建夫陈玲马利民夏四清孙颖方萍
Owner TONGJI UNIV
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