Method for disposing sludge

Abstract

The invention provides a method for disposing sludge. The method comprises the following steps of: mixing sludge to be disposed with an oxidation guide catalyst and an oxidant to carry out redox reaction; and mixing the redox reaction product with a flocculant to carry out coagulation, wherein the flocculant comprises the following components: 0-60wt% of FeCl3, 37-95wt% of aluminium polychlorid and 3-10wt% of cationic polyacrylamide. The method has the beneficial effects that firstly the sludge to be disposed and the oxidant carry out redox reaction in the presence of the oxidation guide catalyst and then the obtained reaction product is mixed with the flocculant to carry out coagulation; the flocculant adopted in the method is beneficial to deposition of small molecular substances in the obtained reaction product to enable the sludge flocs to undergo re-flocculation, thus increasing the volumes of the sludge flocs; and regenerated sludge flocs are conductive to reducing the specific resistance of the sludge as the proteins, polysaccharides and the like in the sludge are reduced.

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 organic matter, microbial micelle and other sedimentary substances produced in sewage treatment plants during sewage treatment, as well as residues such as floating foam on the surface of sewage, which contains a large number of pathogenic bacteria, parasites, disease-treating microorganisms, dioxins and arsenic, Toxic heavy metals such as copper, mercury, and chromium, and even toxic and harmful substances that are difficult to degrade, such as radionuclides, will pose a huge potential threat to the ecological environment if they are randomly disposed of in mountain farmland or landfilled irregularly. The water-absorbing characteristics of colloids will also lead to high water content and large volume of sludge, which will bring difficulties to stacking and transportation. Content of the stud...

Examples

preparation example Construction

[0039] 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.

[0040] 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, more preferably (4%~7%) %): 1; when the sludge to be treated is sludge, the mass ratio of the oxidation-directing catalyst to the...

Embodiment 1

[0055] Carbon powder and FeCl with a mass ratio of 80:20 3 Mixing and mixing evenly to obtain an oxidation-guided catalyst;

[0056] Add 50 g of the oxidation-directed 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.

[0057] The 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;

[0058] The present invention detects that the pH value of the filtrate is 6.5.

Embodiment 2

[0060] 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;

[0061] Add 0.35kg of the oxidation-directed catalyst prepared in this embodiment to the remaining sludge containing 10kg dry basis, after stirring, pass 3.5g of ozone into it to carry out 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.

[0062] The 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;

[0063] The present invention detects that the pH value of the filtrate is 6.8.

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 organic matter, microbial micelle and other sedimentary substances produced in sewage treatment plants during sewage treatment, as well as residues such as floating foam on the surface of sewage, which contains a large number of pathogenic bacteria, parasites, disease-treating microorganisms, dioxins and arsenic, Toxic heavy metals such as copper, mercury, and chromium, and even toxic and harmful substances that are difficult to degrade, such as radionuclides, will pose a huge potential threat to the ecological environment if they are randomly disposed of in mountain farmland or landfilled irregularly. The water-absorbing characteristics of colloids will also lead to high water content and large volume of sludge, which will bring difficulties to stacking and transportation. Content of the stud...

Examples

preparation example Construction

[0039] 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.

[0040] 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, more preferably (4%~7%) %): 1; when the sludge to be treated is sludge, the mass ratio of the oxidation-directing catalyst to the...

Embodiment 1

[0055] Carbon powder and FeCl with a mass ratio of 80:20 3 Mixing and mixing evenly to obtain an oxidation-guided catalyst;

[0056] Add 50 g of the oxidation-directed 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.

[0057] The 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;

[0058] The present invention detects that the pH value of the filtrate is 6.5.

Embodiment 2

[0060] 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;

[0061] Add 0.35kg of the oxidation-directed catalyst prepared in this embodiment to the remaining sludge containing 10kg dry basis, after stirring, pass 3.5g of ozone into it to carry out 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.

[0062] The 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;

[0063] The present invention detects that the pH value of the filtrate is 6.8.