CN115650541A - Heavy metal sludge treatment method - Google Patents
Heavy metal sludge treatment method Download PDFInfo
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- CN115650541A CN115650541A CN202211381684.5A CN202211381684A CN115650541A CN 115650541 A CN115650541 A CN 115650541A CN 202211381684 A CN202211381684 A CN 202211381684A CN 115650541 A CN115650541 A CN 115650541A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a heavy metal sludge treatment method, relates to the technical field of sludge treatment, and comprises the following steps: s1, preparing a leavening agent; s2, flocculation treatment; s3, fermentation treatment; s4, turning over; s5, drying and packaging; through the method, the sludge containing the heavy metals can be effectively treated, the heavy metal content in the sludge is greatly reduced, meanwhile, the nutrient substances in the sludge can be effectively improved, and the sludge can be better used as a soil improvement material, so that waste utilization is realized, especially, resources are reasonably utilized, the aim of ecological environment protection is fulfilled, through multiple turning, the active substances metabolized by fermentation of zymophyte fermentation can be uniformly distributed in the sludge, and meanwhile, the removal rate of the heavy metals in the sludge can be further reduced.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a heavy metal sludge treatment method.
Background
Along with the acceleration of urbanization and the improvement of living standard, public concern about environmental problems is increasing, the requirement for environmental quality is also increasing, in order to prevent water pollution and improve ecological environment, the urban sewage treatment rate in China is rapidly increased, the discharge amount of urban domestic sewage in China is large, in the urban sewage treatment, urban sludge accounting for 0.02% of sewage volume is generally generated, and the generation amount of urban sludge is increasing along with the continuous construction of sewage treatment plants.
The disposal method of municipal sludge is usually applied to the sea, buried, burned, agricultural and the like, the municipal sludge contains a large amount of organic matters and plant nutrient elements such as N, P and the like, and after the municipal sludge is applied to the soil, the fertility of the soil can be improved, and the yield of crops can be increased.
The treatment effect of the prior art on municipal sludge is general, and the reduction effect on heavy metals in the sludge is limited, so a new scheme needs to be provided to solve the problems.
Disclosure of Invention
Aiming at the defects in the prior art, the first purpose of the invention is to provide a heavy metal sludge treatment method which has the advantage of high sludge treatment efficiency.
In order to achieve the purpose, the invention provides the following technical scheme:
a heavy metal sludge treatment method comprises the following steps:
s1, preparing a leavening agent:
sequentially adding corn stigma, soybean meal, liquorice and wood powder into a stirrer, and uniformly stirring to obtain a mixture;
adding zymophyte into the mixture, then uniformly stirring, and carrying out fermentation treatment for 8-12 hours to obtain a required leavening agent;
s2, flocculation treatment:
adding a flocculating agent into the sludge to be treated, uniformly stirring, and performing flocculation treatment to obtain flocculation-treated sludge;
the flocculation treatment adopted by the invention can have a certain flocculation aggregation effect on the heavy metal in the sludge, so that the subsequent fermentation of the sludge by the leavening agent can be facilitated, a large amount of heavy metal elements in the sludge can be phagocytized, and the content of the heavy metal in the sludge can be reduced;
s3, fermentation treatment:
adding the prepared leavening agent into the flocculation-treated sludge, uniformly stirring, and performing fermentation treatment for 15-18 hours to obtain fermented sludge;
s4, turning:
turning over the fermented sludge obtained in the step S3 for 3-5 times, wherein the turning over time is 30min each time;
s5, drying and packaging:
and (5) drying and crushing the sludge turned in the step (S4), and then packaging and bagging.
As a further technical scheme, the mixing mass ratio of the corn stigma, the soybean meal, the liquorice and the wood powder in the step S1 is 3-5.
As a further technical scheme, the wood flour is willow wood flour;
the willow wood powder is subjected to alkaline treatment:
adding 5 times of clear water by mass into willow wood powder, stirring uniformly, adjusting the temperature to 80 ℃, keeping the temperature and stirring for 30min, then adjusting the pH to 10.5, continuously adjusting the temperature to 95 ℃, keeping the temperature and stirring for 1 h, then filtering, washing to neutrality with water, and drying to obtain the willow wood powder.
As a further technical scheme, the zymophyte in the step S1 is as follows: aspergillus niger, actinomycetes, nitrobacteria and bacillus;
the mass ratio of the Aspergillus niger to the actinomycetes to the nitrifying bacteria to the bacillus is 1-3;
the mixing weight ratio of the zymophyte to the mixture is 1-1.5.
As a further technical scheme, the fermentation temperature of the zymophyte is 35 ℃.
According to the invention, through the synergistic cooperation of the Aspergillus niger, the actinomycetes, the nitrobacteria and the bacillus, the heavy metal in the sludge can be phagocytized and the heavy metal elements can be converted, so that the content of the heavy metal in the sludge is greatly reduced, the problem that the treated sludge cannot be used due to the high content of the heavy metal is solved, the treated sludge can be used as soil fertility filler, the physicochemical property of the soil can be greatly improved, the fertility of the soil is improved, and the four strains are metabolized to generate various active substances, so that the growth of plants can be effectively promoted;
as a further technical scheme, the mass ratio of the flocculant to the sludge to be treated in the step S2 is 3.
As a further technical scheme, the flocculant is prepared by mixing anionic polymeric silicic acid and polyacrylamide;
the mixing mass ratio of the anionic polymeric silicic acid to the polyacrylamide is 1.
As a further technical scheme, the mixing mass ratio of the fermentation agent to the flocculation treatment sludge in the step S3 is 2-2.5.
As a further technical scheme, the turning in the step S4 is that the sludge is turned from the bottom of the sludge to the surface of the sludge and is repeatedly turned, and the interval time between every two turns is 30min.
Through multiple turning, active substances metabolized by fermentation of the zymophyte can be uniformly distributed in the sludge, and meanwhile, the removal rate of heavy metals in the sludge can be further reduced.
In summary, compared with the prior art, the invention has the following beneficial effects:
the method can effectively treat the sludge containing the heavy metals, greatly reduce the content of the heavy metals in the sludge, effectively improve the nutrient substances in the sludge, and better serve as a soil improvement material, thereby realizing waste utilization, particularly reasonable utilization of resources and the aim of composite ecological environment protection.
Detailed Description
The present invention will now be described in detail with reference to examples.
Example 1:
a heavy metal sludge treatment method comprises the following steps:
s1, preparing a leavening agent:
sequentially adding corn stigma, soybean meal, liquorice and wood powder into a stirrer, and uniformly stirring to obtain a mixture;
adding zymophyte into the mixture, then uniformly stirring, and performing fermentation treatment for 8 hours to obtain a required leavening agent; the zymocyte is: aspergillus niger, actinomycetes, nitrobacteria and bacillus;
the mass ratio of the Aspergillus niger to the actinomycetes to the nitrobacteria to the bacillus is 1;
the mixing weight ratio of the zymophyte to the mixture is 1.
The fermentation temperature of the zymophyte is 35 ℃;
the mixing mass ratio of the corn stigma, the soybean meal, the liquorice and the wood powder is 3.
The wood powder is willow wood powder;
the willow wood powder is subjected to alkaline treatment:
adding 5 times of clear water into willow wood powder, stirring, adjusting temperature to 80 deg.C, stirring for 30min, adjusting pH to 10.5, adjusting temperature to 95 deg.C, stirring for 1 hr, filtering, washing to neutral, and drying.
S2, flocculation treatment:
adding a flocculating agent into the sludge to be treated, uniformly stirring, and performing flocculation treatment to obtain flocculation-treated sludge; the mass ratio of the flocculant to the sludge to be treated is 3.
The flocculant is prepared by mixing anionic polymeric silicic acid and polyacrylamide;
the mixing mass ratio of the anionic polymeric silicic acid to the polyacrylamide is 1.
S3, fermentation treatment:
adding the prepared leavening agent into the flocculation-treated sludge, uniformly stirring, and performing fermentation treatment for 15 hours to obtain fermented sludge; the mixing mass ratio of the fermentation agent to the flocculation treatment sludge is 2.
S4, turning:
turning over the fermented sludge obtained in the step S3, wherein the turning over times are 3 times, and the turning over time is 30min each time; the stirring is repeated from the bottom of the sludge to the surface of the sludge, and the interval time between every two stirring is 30min.
S5, drying and packaging:
and (5) drying and crushing the sludge turned in the step (S4), and then packaging and bagging.
Example 2:
a heavy metal sludge treatment method comprises the following steps:
s1, preparing a leavening agent:
sequentially adding corn stigma, soybean meal, liquorice and wood powder into a stirrer, and uniformly stirring to obtain a mixture;
adding zymophyte into the mixture, then uniformly stirring, and performing fermentation treatment for 10 hours to obtain a required leavening agent; the zymocyte is: aspergillus niger, actinomycetes, nitrobacteria and bacillus;
the mass ratio of the Aspergillus niger to the actinomycetes to the nitrobacteria to the bacillus is (2);
the mixing weight ratio of the zymophyte to the mixture is 1.2.
The fermentation temperature of the zymophyte is 35 ℃;
the mixing mass ratio of the corn stigma, the soybean meal, the liquorice and the wood powder is 4.
The wood powder is willow wood powder;
the willow wood powder is subjected to alkaline treatment:
adding 5 times of clear water by mass into willow wood powder, stirring uniformly, adjusting the temperature to 80 ℃, keeping the temperature and stirring for 30min, then adjusting the pH to 10.5, continuously adjusting the temperature to 95 ℃, keeping the temperature and stirring for 1 h, then filtering, washing to neutrality with water, and drying to obtain the willow wood powder.
S2, flocculation treatment:
adding a flocculating agent into the sludge to be treated, uniformly stirring, and performing flocculation treatment to obtain flocculation-treated sludge; and the mass ratio of the flocculant to the sludge to be treated is 3.
The flocculant is prepared by mixing anionic polymeric silicic acid and polyacrylamide;
the mixing mass ratio of the anionic polymeric silicic acid to the polyacrylamide is 1.
S3, fermentation treatment:
adding the prepared leavening agent into the flocculation sludge, uniformly stirring, and performing fermentation treatment for 16 hours to obtain fermented sludge; the mixing mass ratio of the fermentation agent to the flocculation treatment sludge is 2.2.
S4, turning:
turning over the fermented sludge obtained in the step S3, wherein the turning over times are 4 times, and the turning over time is 30min each time; the stirring is repeated from the bottom of the sludge to the surface of the sludge, and the interval time between every two stirring is 30min.
S5, drying and packaging:
and (5) drying and crushing the sludge turned in the step (S4), and then packaging and bagging.
Example 3
A heavy metal sludge treatment method comprises the following steps:
s1, preparing a leavening agent:
sequentially adding corn stigma, soybean meal, liquorice and wood powder into a stirrer, and uniformly stirring to obtain a mixture;
adding zymophyte into the mixture, then uniformly stirring, and carrying out fermentation treatment for 12 hours to obtain a required leavening agent; the zymocyte is: aspergillus niger, actinomycetes, nitrobacteria and bacillus;
the mass ratio of the Aspergillus niger to the actinomycetes to the nitrobacteria to the bacillus is 3;
the mixing weight ratio of the zymophyte to the mixture is 1.5.
The fermentation temperature of the zymophyte is 35 ℃;
the mixing mass ratio of the corn stigma, the soybean meal, the liquorice and the wood powder is 3-5.
The wood powder is willow wood powder;
the willow wood powder is subjected to alkaline treatment:
adding 5 times of clear water into willow wood powder, stirring, adjusting temperature to 80 deg.C, stirring for 30min, adjusting pH to 10.5, adjusting temperature to 95 deg.C, stirring for 1 hr, filtering, washing to neutral, and drying.
S2, flocculation treatment:
adding a flocculating agent into the sludge to be treated, uniformly stirring, and performing flocculation treatment to obtain flocculation-treated sludge; the mass ratio of the flocculant to the sludge to be treated is 3.
The flocculant is prepared by mixing anionic polymeric silicic acid and polyacrylamide;
the mixing mass ratio of the anionic polymeric silicic acid to the polyacrylamide is 1.
S3, fermentation treatment:
adding the prepared leavening agent into the flocculation-treated sludge, uniformly stirring, and performing fermentation treatment for 18 hours to obtain fermented sludge; the mixing mass ratio of the fermentation agent to the flocculation treatment sludge is 2.5.
S4, turning:
turning over the fermented sludge obtained in the step S3 for 5 times, wherein the turning time is 30min each time; the turning is from the bottom of the sludge to the surface of the sludge, and the turning is repeated, wherein the interval time between each turning is 30min.
S5, drying and packaging:
and (5) drying and crushing the sludge turned in the step (S4), and then packaging and bagging.
Comparative example 1:
a heavy metal sludge treatment method comprises the following steps:
s1, flocculation treatment:
adding a flocculating agent into the sludge to be treated, uniformly stirring, and performing flocculation treatment to obtain flocculation-treated sludge; the mass ratio of the flocculant to the sludge to be treated is 3.
The flocculant is prepared by mixing anionic polymeric silicic acid and polyacrylamide;
the mixing mass ratio of the anionic polymeric silicic acid to the polyacrylamide is 1.
S2, turning:
turning over the sludge obtained in the step S1 for 3 times, wherein the turning time is 30min each time; the stirring is repeated from the bottom of the sludge to the surface of the sludge, and the interval time between every two stirring is 30min.
S3, drying and packaging:
and (5) drying and crushing the sludge turned in the step (S4), and then packaging and bagging.
Comparative example 2:
a heavy metal sludge treatment method comprises the following steps:
s1, preparing a leavening agent:
sequentially adding corn stigma, soybean meal, liquorice and wood powder into a stirrer, and uniformly stirring to obtain a mixture;
adding zymophyte into the mixture, then uniformly stirring, and performing fermentation treatment for 8 hours to obtain a required leavening agent; the zymocyte is: aspergillus niger, actinomycetes, nitrobacteria and bacillus;
the mass ratio of the Aspergillus niger to the actinomycetes to the nitrifying bacteria to the bacillus is 1;
the mixing weight ratio of the zymophyte to the mixture is 1.
The fermentation temperature of the zymophyte is 35 ℃;
the mixing mass ratio of the corn stigma, the soybean meal, the liquorice and the wood powder is 3.
The wood powder is willow wood powder;
the willow wood powder is subjected to alkaline treatment:
adding 5 times of clear water into willow wood powder, stirring, adjusting temperature to 80 deg.C, stirring for 30min, adjusting pH to 10.5, adjusting temperature to 95 deg.C, stirring for 1 hr, filtering, washing to neutral, and drying.
S2, fermentation treatment:
adding the prepared leavening agent into sludge, uniformly stirring, and performing fermentation treatment for 15 hours to obtain fermented sludge; the mixing mass ratio of the fermentation agent to the flocculation treatment sludge is 2.
S3, turning:
turning over the fermented sludge obtained in the step S2 for 3 times, wherein the turning over time is 30min each time; the stirring is repeated from the bottom of the sludge to the surface of the sludge, and the interval time between every two stirring is 30min.
S4, drying and packaging:
and (4) drying and crushing the sludge after the turning treatment in the step (S3), and then packaging and bagging.
Comparative example 3:
a heavy metal sludge treatment method comprises the following steps:
s1, preparing a leavening agent:
adding the soybean meal and the wood powder into a stirrer in sequence, and stirring uniformly to obtain a mixture;
adding zymophyte into the mixture, then uniformly stirring, and carrying out fermentation treatment for 8 hours to obtain a required leavening agent; the zymocyte is: aspergillus niger, actinomycetes, nitrobacteria and bacillus;
the mass ratio of the Aspergillus niger to the actinomycetes to the nitrifying bacteria to the bacillus is 1;
the mixing weight ratio of the zymophyte to the mixture is 1.
The fermentation temperature of the zymophyte is 35 ℃;
the mixing mass ratio of the soybean meal to the wood powder is 18.
The wood powder is willow wood powder;
the willow wood powder is subjected to alkaline treatment:
adding 5 times of clear water into willow wood powder, stirring, adjusting temperature to 80 deg.C, stirring for 30min, adjusting pH to 10.5, adjusting temperature to 95 deg.C, stirring for 1 hr, filtering, washing to neutral, and drying.
S2, flocculation treatment:
adding a flocculating agent into the sludge to be treated, uniformly stirring, and performing flocculation treatment to obtain flocculation-treated sludge; the mass ratio of the flocculant to the sludge to be treated is 3.
The flocculant is prepared by mixing anionic polymeric silicic acid and polyacrylamide;
the mixing mass ratio of the anionic polymeric silicic acid to the polyacrylamide is 1.
S3, fermentation treatment:
adding the prepared leavening agent into the flocculation sludge, uniformly stirring, and performing fermentation treatment for 15 hours to obtain fermented sludge; the mixing mass ratio of the fermentation agent to the flocculation treatment sludge is 2.
S4, turning:
turning over the fermented sludge obtained in the step S3, wherein the turning over times are 3 times, and the turning over time is 30min each time; the turning is from the bottom of the sludge to the surface of the sludge, and the turning is repeated, wherein the interval time between each turning is 30min.
S5, drying and packaging:
and (5) drying and crushing the sludge turned in the step (S4), and then packaging and bagging.
Comparative example 4:
a heavy metal sludge treatment method comprises the following steps:
s1, preparing a leavening agent:
sequentially adding corn stigma, soybean meal, liquorice and wood powder into a stirrer, and uniformly stirring to obtain a mixture;
adding zymophyte into the mixture, then uniformly stirring, and carrying out fermentation treatment for 8 hours to obtain a required leavening agent; the zymophyte is as follows: aspergillus niger;
the mixing weight ratio of the zymophyte to the mixture is 1.
The fermentation temperature of the zymophyte is 35 ℃;
the mixing mass ratio of the corn stigma, the soybean meal, the liquorice and the wood powder is 3.
The wood powder is willow wood powder;
the willow wood powder is subjected to alkaline treatment:
adding 5 times of clear water into willow wood powder, stirring, adjusting temperature to 80 deg.C, stirring for 30min, adjusting pH to 10.5, adjusting temperature to 95 deg.C, stirring for 1 hr, filtering, washing to neutral, and drying.
S2, flocculation treatment:
adding a flocculating agent into the sludge to be treated, uniformly stirring, and performing flocculation treatment to obtain flocculation-treated sludge; the mass ratio of the flocculant to the sludge to be treated is 3.
The flocculant is prepared by mixing anionic polymeric silicic acid and polyacrylamide;
the mixing mass ratio of the anionic polymeric silicic acid to the polyacrylamide is 1.
S3, fermentation treatment:
adding the prepared leavening agent into the flocculation-treated sludge, uniformly stirring, and performing fermentation treatment for 15 hours to obtain fermented sludge; the mixing mass ratio of the fermentation agent to the flocculation treatment sludge is 2.
S4, turning:
turning over the fermented sludge obtained in the step S3 for 3 times, wherein the turning over time is 30min each time; the stirring is repeated from the bottom of the sludge to the surface of the sludge, and the interval time between every two stirring is 30min.
S5, drying and packaging:
and (5) drying and crushing the sludge after the turning treatment in the step (S4), and then packaging and bagging.
Comparative example 5:
a heavy metal sludge treatment method comprises the following steps:
s1, preparing a leavening agent:
adding the soybean meal and the wood flour into a stirrer in sequence, and stirring uniformly to obtain a mixture;
adding zymophyte into the mixture, then uniformly stirring, and carrying out fermentation treatment for 8 hours to obtain a required leavening agent; the zymocyte is: aspergillus niger;
the mixing weight ratio of the zymophyte to the mixture is 1.
The fermentation temperature of the zymophyte is 35 ℃;
the mixing mass ratio of the corn stigma, the soybean meal, the liquorice and the wood powder is 18.
The wood powder is willow wood powder;
the willow wood powder is subjected to alkaline treatment:
adding 5 times of clear water into willow wood powder, stirring, adjusting temperature to 80 deg.C, stirring for 30min, adjusting pH to 10.5, adjusting temperature to 95 deg.C, stirring for 1 hr, filtering, washing to neutral, and drying.
S2, flocculation treatment:
adding a flocculating agent into sludge to be treated, uniformly stirring, and performing flocculation treatment to obtain flocculation-treated sludge; the mass ratio of the flocculant to the sludge to be treated is 3.
The flocculant is prepared by mixing anionic polymeric silicic acid and polyacrylamide;
the mixing mass ratio of the anionic polymeric silicic acid to the polyacrylamide is 1.
S3, fermentation treatment:
adding the prepared leavening agent into the flocculation-treated sludge, uniformly stirring, and performing fermentation treatment for 15 hours to obtain fermented sludge; the mixing mass ratio of the fermentation agent to the flocculation treatment sludge is 2.
S4, turning:
turning over the fermented sludge obtained in the step S3 for 3 times, wherein the turning over time is 30min each time; the turning is from the bottom of the sludge to the surface of the sludge, and the turning is repeated, wherein the interval time between each turning is 30min.
S5, drying and packaging:
and (5) drying and crushing the sludge turned in the step (S4), and then packaging and bagging.
Comparative example 6:
a heavy metal sludge treatment method comprises the following steps:
s1, preparing a leavening agent:
sequentially adding corn stigma, soybean meal, liquorice and wood powder into a stirrer, and uniformly stirring to obtain a mixture;
adding zymophyte into the mixture, then uniformly stirring, and carrying out fermentation treatment for 8 hours to obtain a required leavening agent; the zymocyte is: aspergillus niger, actinomycetes, nitrobacteria and bacillus;
the mass ratio of the Aspergillus niger to the actinomycetes to the nitrobacteria to the bacillus is 1;
the mixing weight ratio of the zymophyte to the mixture is 1.
The fermentation temperature of the zymophyte is 35 ℃;
the mixing mass ratio of the corn stigma, the soybean meal, the liquorice and the wood powder is 3.
The wood powder is willow wood powder;
the willow wood powder is subjected to alkaline treatment:
adding 5 times of clear water into willow wood powder, stirring, adjusting temperature to 80 deg.C, stirring for 30min, adjusting pH to 10.5, adjusting temperature to 95 deg.C, stirring for 1 hr, filtering, washing to neutral, and drying.
S2, flocculation treatment:
adding a flocculating agent into sludge to be treated, uniformly stirring, and performing flocculation treatment to obtain flocculation-treated sludge; the mass ratio of the flocculant to the sludge to be treated is 3.
The flocculant is prepared by mixing anionic polymeric silicic acid and polyacrylamide;
the mixing mass ratio of the anionic polymeric silicic acid to the polyacrylamide is 1.
S3, fermentation treatment:
adding the prepared leavening agent into the flocculation-treated sludge, uniformly stirring, and performing fermentation treatment for 15 hours to obtain fermented sludge; the mixing mass ratio of the fermentation agent to the flocculation treatment sludge is 2.
S4, drying and packaging:
and (4) drying and crushing the sludge subjected to the step (S3), and then packaging and bagging.
In order to compare the technical effects of the application, the sludge treated by the methods of example 1 and comparative examples 1 to 6 is numbered 1 to 7 in sequence, and the following comparisons are made:
the water content of the sludge is 84.36%, the pH value is 7.88, the total chromium content is 836mg/kg, the hexavalent chromium content is 104mg/L, the highest total chromium leaching concentration is 35.3mg/L, the hexavalent chromium leaching concentration is 8.6mg/L, and the copper content is 380mg/L:
comparing the total chromium content, the hexavalent chromium content, the total chromium leaching concentration and the hexavalent chromium leaching concentration in the treated sludge;
the total chromium content is determined by a national standard method-a flame atomic absorption method, and the hexavalent chromium content is determined by an alkaline digestion hexavalent chromium ultraviolet spectrophotometry method. The total chromium leaching concentration is measured by an inductively coupled plasma mass spectrometry for measuring metal elements in solid waste, and the hexavalent chromium leaching concentration is measured by a spectrophotometric method of GB/T1555.4-1995 dibenzoyl dihydrazide;
TABLE 1
From the above table 1, it can be seen that the content of heavy metal chromium in the sludge treated by the method of the present invention is greatly reduced, and thus, the method of the present invention can significantly reduce the content of heavy metal in the sludge.
(2) The removal rate of copper after sludge treatment of the examples and comparative examples was compared:
copper removal rate = (w-w) 1 )/w×100％；
w-copper content mg/L before treatment;
w 1 -copper content mg/L after treatment;
TABLE 2
| Grouping | Copper removal Rate% |
| 1 | 96.8 |
| 2 | 30.7 |
| 3 | 35.8 |
| 4 | 45.7 |
| 5 | 40.6 |
| 6 | 50.3 |
| 7 | 86.3 |
The above table 2 shows that the method of the present invention can greatly reduce the copper content in the sludge after the sludge is treated, and the removal rate of the copper in the sludge is greatly improved.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (9)
1. The heavy metal sludge treatment method is characterized by comprising the following steps:
s1, preparing a leavening agent:
sequentially adding corn stigma, soybean meal, liquorice and wood powder into a stirrer, and uniformly stirring to obtain a mixture;
adding zymophyte into the mixture, then stirring uniformly, and performing fermentation treatment for 8-12 hours to obtain a required leavening agent;
s2, flocculation treatment:
adding a flocculating agent into sludge to be treated, uniformly stirring, and performing flocculation treatment to obtain flocculation-treated sludge;
s3, fermentation treatment:
adding the prepared leavening agent into the flocculation sludge, uniformly stirring, and performing fermentation treatment for 15-18 hours to obtain fermentation sludge;
s4, turning:
turning over the fermented sludge obtained in the step S3, wherein the turning over times are 3-5 times, and the turning over time is 30min each time;
s5, drying and packaging:
and (5) drying and crushing the sludge turned in the step (S4), and then packaging and bagging.
2. The heavy metal sludge treatment method according to claim 1, wherein the mixing mass ratio of corn stigma, soybean meal, liquorice and wood powder in the step S1 is 3-5.
3. The heavy metal sludge treatment method according to claim 2, wherein the wood flour is willow wood flour;
the willow wood powder is subjected to alkaline treatment:
adding 5 times of clear water into willow wood powder, stirring, adjusting temperature to 80 deg.C, stirring for 30min, adjusting pH to 10.5, adjusting temperature to 95 deg.C, stirring for 1 hr, filtering, washing to neutral, and drying.
4. The heavy metal sludge treatment method according to claim 1, wherein the fermentation tubes in step S1 are: aspergillus niger, actinomycetes, nitrobacteria and bacillus;
the mass ratio of the Aspergillus niger to the actinomycetes to the nitrifying bacteria to the bacillus is 1-3;
the mixing weight ratio of the zymophyte to the mixture is 1-1.5.
5. The method for treating heavy metal sludge according to claim 4, wherein the fermentation temperature of the zymophyte is 35 ℃.
6. The heavy metal sludge treatment method according to claim 1, wherein the mass ratio of the flocculant to the sludge to be treated in step S2 is 3.
7. The method for treating heavy metal sludge according to claim 1, wherein the flocculant is prepared by mixing anionic polymeric silicic acid and polyacrylamide;
the mixing mass ratio of the anionic polymeric silicic acid to the polyacrylamide is 1.
8. The heavy metal sludge treatment method according to claim 1, wherein the mixing mass ratio of the fermentation agent to the flocculation treatment sludge in step S3 is 2-2.5.
9. The method for treating heavy metal sludge as claimed in claim 1, wherein the turning in step S4 is repeated from the bottom of the sludge to the surface of the sludge, and the time interval between each turning is 30min.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116715507A (en) * | 2023-04-19 | 2023-09-08 | 安徽龙钰徽派古建工艺制品有限公司 | Method for preparing baked brick by roasting river sludge at high temperature |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116715507A (en) * | 2023-04-19 | 2023-09-08 | 安徽龙钰徽派古建工艺制品有限公司 | Method for preparing baked brick by roasting river sludge at high temperature |
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