Method for disposing sludge

A sludge and catalyst technology, which is applied in the oxidation treatment of sludge, dewatering/drying/concentrating sludge treatment, etc., can solve the problems of decreased catalytic capacity, deactivation of catalyst, and unfavorable degradation of organic matter in sludge.

Inactive Publication Date: 2013-03-27
湖南清和环保技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, adding CaO to the sludge in this method increases the pH value of the sludge, and the change of the pH value directly affects the complexing equilibrium relationship of the metal, thereby affecting the oxidation ability of ozone. 3+ For example, in an alkaline environment, Fe 3+ It cannot

Method used

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Examples

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Effect test

preparation example Construction

[0041] The present invention has no special limitation on the preparation method of the oxidation-directed catalyst, and the technical scheme for preparing the composition well-known to those skilled in the art can be used. In the present invention, the above-mentioned components are preferably mixed uniformly to obtain the oxidation-directed catalyst.

[0042] After the oxidation-guiding catalyst is obtained, the present invention preferentially adds the oxidation-guiding catalyst to the sludge to be treated, and the amount of the oxidation-guiding catalyst varies according to the type of sludge to be treated. In the present invention, the The sludge to be treated is preferably excess sludge or sludge. When the sludge to be treated is excess sludge, the mass ratio of the oxidation-guiding catalyst to the dry basis in the excess sludge is (3%~8%):1, preferably (4%~7%) ): 1; when the sludge to be treated is sludge, the mass ratio of the oxidation-directing catalyst to the dry b...

Embodiment 1

[0057] Carbon powder and FeCl with a mass ratio of 80:20 3 Mixing and mixing evenly to obtain an oxidation-guided catalyst;

[0058] Add 50 g of the oxidation-guiding catalyst obtained in this embodiment to the remaining sludge containing 1.0 kg dry basis, and after stirring, pass 0.5 g of ozone into it to carry out the oxidation-reduction reaction; add 0.5 g of ozone to the obtained oxidation-reduction reaction product Contains 45wt% FeCl 3 , 45wt% of the PAC and 10wt% of the CPAM flocculant, fully mixed and flocculated, obtained solid matter and filtrate through pressure filtration.

[0059] The present invention detects that the pH value of the filtrate is 6; the present invention detects that the specific resistance of the sludge obtained through flocculation is 0.080×10 12 m / kg~1.0×10 12 m / kg.

Embodiment 2

[0061] Mix activated carbon powder, fly ash, iron formate and aluminum formate with a mass ratio of 30:35:10:15, and mix uniformly to obtain an oxidation-guiding catalyst;

[0062] Add 0.35kg of the oxidation-directed catalyst prepared in this embodiment to the remaining sludge containing 10kg dry basis, and after stirring, pass 3.5g of ozone into it to carry out the redox reaction; add 10g containing 50wt% FeCl 3 , 45wt% of the PAC and 5wt% of the CPAM flocculant, fully mixed for flocculation, solid matter and filtrate obtained by pressure filtration.

[0063] The present invention detects that the pH value of the filtrate is 6.2, and the present invention detects that the specific resistance of the sludge obtained through flocculation is 0.090×10 12 m / kg~1.2×10 12 m / kg.

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Abstract

The invention provides a method for disposing sludge. The method comprises the following steps of: mixing sludge to be disposed with oxidants and an oxidation guide catalyst to carry out redox reaction; and mixing the redox reaction product with a flocculant to carry out coagulation to obtain a solid substance and filtrate, wherein the mass ratio of the oxidation guide catalyst to the dry basis of the sludge to be disposed is (3-8%):1; and the oxidation guide catalyst comprises 5-45wt% of metallic compounds and 55-95wt% of adsorbents. The method has the beneficial effects that when the sludge is disposed with the oxidation guide catalyst capsule adopted in the method provided by the invention, the initiation effect of the oxidation guide catalyst capsule can be exerted, without adding pH value regulators to the oxidation guide catalyst capsule, so that the oxidants can better decompose organic substances in the sludge in an oxidative manner; and therefore the sludge disposed by the method is neutral and the subduction amount of the sludge reaches the maximum, thus being beneficial to conduction of the subsequent process.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for treating sludge. Background technique [0002] Sludge is a product of sewage treatment, mainly from primary sedimentation tanks, secondary sedimentation tanks and other process links. The amount of sludge produced per 10,000 cubic meters of sewage after treatment (based on a moisture content of 80%) is generally about 5 to 10 tons. The sludge must be concentrated before dehydration and transport to reduce the moisture content of the sludge and reduce the volume of the sludge. volume. [0003] The basic principle of secondary biochemical treatment of sewage in sewage plants in the prior art is that microorganisms use organic matter in sewage as nutrients for their own metabolism, decompose them, and convert them into CO 2 、H 2 O and metabolic secretions, the residual secretions produced by microbial metabolism form excess sludge, and excess sludge,...

Claims

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Application Information

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IPC IPC(8): C02F11/06C02F11/14
Inventor 李志光刘海林李明松
Owner 湖南清和环保技术有限公司
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