Sludge treatment method

A treatment method and sludge technology, applied in water/sludge/sewage treatment, water/sewage treatment, special treatment targets, etc., can solve the problem of inconsistent conclusions about the dosage ratio of chemicals, difficult sedimentation of sludge suspended matter, and improved Sludge treatment costs and other issues, to achieve the effect of facilitating large-scale industrial production, less equipment, and convenient operation

Inactive Publication Date: 2017-09-22
HUNAN AGRICULTURAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the addition of transition metal ions (Fe 2+ ) to activate persulfate for deep dehydration of sludge, but the addition of metal ions will not only cause changes in the color of sludge, but there is no consistent conclusion on the dosage of chemicals, and it will also lead to changes in sludge settling properties. Poor, such as: a large amount of precipitation of iron ions in ferrous sulfate produces a large amount of iron sludge, and even causes a large amount of suspended sludge to be difficult to settle in wastewater
In the long run, the way of activating persulfate is very necessary, but no matter what method (thermal activation, ultraviolet activation, transition metal activation) is adopted at present, it will greatly increase the treatment cost of sludge

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0031] A method for treating sludge, comprising the steps of:

[0032] (1) Get seven groups of raw sludge (the content of heavy metals in the raw sludge is shown in Table 1), and use concentration of 5mol / L H 2 SO 4 The solution adjusted the pH value of each group of sludge to 2.

[0033] (2) According to the addition amount, it is 0, 3g / L, 6g / L, 9g / L, 12g / L, 15g / L, 18g / L respectively (that is, adding potassium persulfate 0, 3g, 6g, 9g, 12g, 15g, 18g), add potassium persulfate to the sludge after pH adjustment in step (1), stir under a constant temperature magnetic stirrer, oxidize at 25°C for 60min, and centrifuge the product obtained from the oxidation treatment Separation and suction filtration to obtain the sludge cake and supernatant I, and complete the treatment of the sludge.

[0034] Table 1 Contents of heavy metals in raw sludge

[0035] heavy metal

Pb (mg / kg)

Zn(mg / kg)

Cu(mg / kg)

Cd (μg / kg)

content

204.5

521.53

278.56

121...

Embodiment 2

[0045] A method for treating sludge, comprising the steps of:

[0046] (1) Take five groups of sludge (the content of heavy metals in the sludge is shown in Table 1), and use the concentration of 5mol / L H 2 SO 4 The solution adjusted the pH value of each group of sludge to 1, 2, 3, 4, 5.

[0047] (2) be 9g / L by addition (that is, add potassium persulfate 9g in every liter of sludge), add potassium persulfate respectively in the sludge after step (1) adjusts pH, stir under constant temperature magnetic stirrer, Oxidation treatment at 25°C for 60 minutes, centrifugation and suction filtration of the product obtained from the oxidation treatment to obtain sludge cake and supernatant I, and complete the treatment of the sludge.

[0048] Get the sludge mud cake that obtains among the embodiment 2, put into oven and dry 8.0h, then take by weighing 0.5g dry sludge and digest, measure the heavy metal content in the sludge, the result is as follows Figure 4 shown. Figure 4 It is ...

Embodiment 3

[0050] A method for treating sludge, comprising the steps of:

[0051] (1) Take four groups of sludge (the content of heavy metals in the sludge is shown in Table 1), and use the concentration of 5mol / L H 2 SO 4 The solution adjusted the pH value of each group of sludge to 2.

[0052] (2) According to the addition amount is respectively 9g / L (that is, add potassium persulfate 9g in every liter of sludge), add potassium persulfate respectively to the sludge after pH adjustment in step (1), stir under constant temperature magnetic stirrer , oxidized at 25°C for 60 minutes, centrifuged the product obtained from the oxidized treatment, and filtered it with suction to obtain sludge cake and supernatant I.

[0053] (3) 0.25%, 0.5%, 0.75%, 1.0% by mass ratio (that is, the mass ratio of calcium oxide to supernatant I is 0.25%, 0.5%, 0.75%, 1.0%), to step (2) Calcium oxide was added to the obtained supernatant Ⅰ, and the reaction was carried out under stirring conditions, wherein th...

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Abstract

The invention discloses a sludge treatment method. The sludge treatment method comprises the following step: carrying out oxidization treatment on sludge under an acidic condition by adopting persulfate, so as to finish the treatment of the sludge. By adopting the treatment method disclosed by the invention, the sludge is treated under the acidic condition by adopting the persulfate, so that the dehydration performance of the sludge can be improved, and the content of heavy metal in the sludge can also be reduced; the sludge treatment method has the advantages of simple and convenient process, convenient operation, little required equipment, low operation cost, convenience for large-scale industrial production and the like; reducing, stabilized, harmless and subsequent resourceful utilization of the sludge is realized, and the sludge treatment method has a very good application prospect.

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to a method for treating sludge, in particular to a method for treating sludge with an oxidant. Background technique [0002] At this stage, based on the actual situation and economic conditions of our country, landfill and sludge agricultural use are still being implemented as transitional methods for sludge disposal. No matter what kind of sludge disposal method is adopted, the reduction of sludge is the key to sludge treatment. It is of great significance to reduce the cost of sludge treatment, promote sustainable development, and reduce the impact on the environment. Sludge dehydration is the focus of the treatment process. The purpose is to remove the water existing between and within the sludge particles, so that the physical properties of the sludge can be changed into semi-solid. [0003] Commonly used sludge conditioning methods include: physical conditioning technolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/06C02F1/62C02F101/10C02F101/20
CPCC02F11/06C02F1/62C02F2101/105C02F2101/20C02F2303/06
Inventor 曾清如张维宁肖智华周细红
Owner HUNAN AGRICULTURAL UNIV
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