Heavy metal stabilizer used for sludge treatment, and method for treating sludge by adopting it

A heavy metal stabilizer and sludge treatment technology, applied in sludge treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., to achieve the effect of simple equipment, easy large-scale production, and wide sources

Inactive Publication Date: 2014-05-14
SHENZHEN OCEAN POWER INDUSTRIAL CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the shortcomings existing in the existing solidification method for treating heavy metals in sludge, the pres

Method used

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  • Heavy metal stabilizer used for sludge treatment, and method for treating sludge by adopting it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 30 parts of hydroxyapatite, 30 parts of bentonite, 20 parts of calcium oxide, 14 parts of calcium hydroxide, 5 parts of sodium sulfide, 0.5 parts of sodium edetate, 0.7 parts of carbonamide, polyacrylamide 0.8 part of flocculant, it is placed in the agitator and stirred until mixed evenly to obtain the heavy metal stabilizer; after weighing 5% of the heavy metal stabilizer relative to the total weight of the sludge and adding it all to the sludge, place Stir in a blender until evenly mixed; spread out the sludge and let it dry naturally.

[0033] After 2 days, according to the Solid Waste Toxic Leaching (TCLP) method of the United States Environmental Protection Agency, the heavy metal content in the leachate was measured with an atomic absorption spectrophotometer, and the test results are listed in Table 1.

Embodiment 2

[0035] Weigh 60 parts of hydroxyapatite, 5 parts of calcium peroxide, 12 parts of calcium oxide, 14 parts of calcium hydroxide, 5 parts of calcium sulfide, 1.5 parts of sodium edetate, and 1.7 parts of carbonamide , 1.8 parts of polyacrylamide flocculant, put it in a stirrer and stir until mixed evenly to obtain a heavy metal stabilizer; weigh 5% of the heavy metal stabilizer relative to the total weight of the sludge and add it all to the sludge After neutralizing, put it in a blender and stir until it is evenly mixed; spread out the sludge and let it dry naturally for curing.

[0036] After 2 days, according to the Solid Waste Toxic Leaching (TCLP) method of the United States Environmental Protection Agency, the heavy metal content in the leachate was measured with an atomic absorption spectrophotometer, and the test results are listed in Table 1.

Embodiment 3

[0038] Weigh 30 parts of rock phosphate ore, 26 parts of bentonite, 20 parts of calcium oxide, 14 parts of calcium hydroxide, 5 parts of sodium sulfide, 2.5 parts of sodium edetate, 1.7 parts of carbonamide, polyacrylamide flocculation 1.8 parts of the agent, put it in a stirrer and stir until evenly mixed to obtain the heavy metal stabilizer; weigh 5% of the heavy metal stabilizer relative to the total weight of the sludge and add all of it to the sludge, place in Stir in a blender until evenly mixed; spread out the sludge and let it dry naturally.

[0039] After 2 days, according to the Solid Waste Toxic Leaching (TCLP) method of the United States Environmental Protection Agency, the heavy metal content in the leachate was measured with an atomic absorption spectrophotometer, and the test results are listed in Table 1.

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Abstract

The invention relates to a heavy metal stabilizer used for sludge treatment. The stabilizer comprises, by weight, 30-90 parts of inorganic powder, 0.1-20 parts of sulfide, 0.1-20 parts of organic chelate, 0.1-20 parts of an amide chemical substance, and 0.1-20 parts of an organic flocculating agent. The stabilizer is used for treating sludge, especially low-content sludge or sludge containing a plurality of heavy metals, the content of heavy metals in a leachate of heavy metals in the sludge immobilized and stabilized by the heavy metal stabilizer is far lower than Chinese standards, the stabilized sludge can be locally embedded or applied to roadbeds, greening, soil covering, ecologic restoration and the like, and the stablizer can effectively solve the problem of difficult treatment of the heavy metal sludge, causes no secondary pollution to the environment, can realize an efficient, reasonable, environmentally-friendly and economic treatment technology, and can be widely applied to sludge treatment. The stabilizer has the characteristics of cheap and easily available raw materials, simple technology and apparatus, small investment, easy operation and the like, and has a high economic benefit. The invention also provides a method for treating sludge by adopting the heavy metal stabilizer.

Description

【Technical field】 [0001] The invention relates to the field of environmental protection, in particular to a heavy metal stabilizer for sludge treatment and a method for treating heavy metals in sludge by using the heavy metal stabilizer. 【Background technique】 [0002] The sludge produced by the sewage treatment plant during the sewage treatment process contains a large amount of heavy metals. If it is not treated properly, the heavy metal pollutants in the sludge will enter the soil, migrate or spread in the environment, and endanger human and other biological safety. [0003] At present, there are separation methods and solidification methods for the disposal of heavy metals in sludge. Separation methods mainly include the use of chemical separation, bioleaching, phytoremediation or biosorption to separate heavy metal pollutants from sludge and separate them from sludge to achieve the purpose of eliminating pollution. The separation method is costly and difficult. Used on...

Claims

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Application Information

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IPC IPC(8): C02F11/00
Inventor 刘方徐丽华张钰何唯平
Owner SHENZHEN OCEAN POWER INDUSTRIAL CO LTD
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