CN115215519A - Detoxification method of thallium-polluted river sediment - Google Patents
Detoxification method of thallium-polluted river sediment Download PDFInfo
- Publication number
- CN115215519A CN115215519A CN202210845803.1A CN202210845803A CN115215519A CN 115215519 A CN115215519 A CN 115215519A CN 202210845803 A CN202210845803 A CN 202210845803A CN 115215519 A CN115215519 A CN 115215519A
- Authority
- CN
- China
- Prior art keywords
- flocculated
- thallium
- river sediment
- carbonized
- consolidated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000013049 sediment Substances 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000001784 detoxification Methods 0.000 title claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 62
- 238000003763 carbonization Methods 0.000 claims abstract description 61
- UUEWCQRISZBELL-UHFFFAOYSA-N 3-trimethoxysilylpropane-1-thiol Chemical compound CO[Si](OC)(OC)CCCS UUEWCQRISZBELL-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000010802 sludge Substances 0.000 claims abstract description 26
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 23
- 239000011593 sulfur Substances 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 22
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 20
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 20
- 239000010881 fly ash Substances 0.000 claims abstract description 20
- 239000004571 lime Substances 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 238000003756 stirring Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000000926 separation method Methods 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 7
- 238000000227 grinding Methods 0.000 claims abstract description 7
- 230000032683 aging Effects 0.000 claims abstract description 5
- 238000010000 carbonizing Methods 0.000 claims abstract description 3
- 239000007787 solid Substances 0.000 claims description 17
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 7
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 5
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 5
- 239000000243 solution Substances 0.000 abstract 2
- 238000010790 dilution Methods 0.000 abstract 1
- 239000012895 dilution Substances 0.000 abstract 1
- 229910052716 thallium Inorganic materials 0.000 description 41
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 description 37
- 230000000694 effects Effects 0.000 description 17
- 239000002689 soil Substances 0.000 description 17
- 238000005189 flocculation Methods 0.000 description 16
- 230000016615 flocculation Effects 0.000 description 16
- 238000002386 leaching Methods 0.000 description 16
- 241000209094 Oryza Species 0.000 description 15
- 230000002786 root growth Effects 0.000 description 14
- 235000007164 Oryza sativa Nutrition 0.000 description 11
- 239000002245 particle Substances 0.000 description 11
- 235000009566 rice Nutrition 0.000 description 11
- 238000012360 testing method Methods 0.000 description 10
- 239000003344 environmental pollutant Substances 0.000 description 8
- 231100000719 pollutant Toxicity 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 230000012010 growth Effects 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 231100000419 toxicity Toxicity 0.000 description 6
- 230000001988 toxicity Effects 0.000 description 6
- 238000007596 consolidation process Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000007865 diluting Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- -1 thallium ion Chemical class 0.000 description 4
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000000536 complexating effect Effects 0.000 description 3
- 229910001653 ettringite Inorganic materials 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 229920000876 geopolymer Polymers 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000010408 sweeping Methods 0.000 description 3
- 239000003575 carbonaceous material Substances 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 239000003651 drinking water Substances 0.000 description 2
- 235000020188 drinking water Nutrition 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000008394 flocculating agent Substances 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 208000004998 Abdominal Pain Diseases 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 206010012735 Diarrhoea Diseases 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 206010028813 Nausea Diseases 0.000 description 1
- 208000007125 Neurotoxicity Syndromes Diseases 0.000 description 1
- 206010044221 Toxic encephalopathy Diseases 0.000 description 1
- 231100000076 Toxic encephalopathy Toxicity 0.000 description 1
- 206010047700 Vomiting Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000003321 atomic absorption spectrophotometry Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 210000001035 gastrointestinal tract Anatomy 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 231100000636 lethal dose Toxicity 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 201000000585 muscular atrophy Diseases 0.000 description 1
- 230000008693 nausea Effects 0.000 description 1
- ZODDGFAZWTZOSI-UHFFFAOYSA-N nitric acid;sulfuric acid Chemical compound O[N+]([O-])=O.OS(O)(=O)=O ZODDGFAZWTZOSI-UHFFFAOYSA-N 0.000 description 1
- 208000001749 optic atrophy Diseases 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 230000008673 vomiting Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/004—Sludge detoxification
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a detoxification method of thallium-polluted river sediment, which comprises the following steps: mixing a sulfur-based flocculant into the thallium-polluted river sediment, uniformly stirring, standing, and performing solid-liquid separation to obtain flocculated river sediment; drying, grinding and carbonizing the flocculated river sediment in a carbonization furnace to obtain carbonized and flocculated consolidated mud powder; adding water into 3-mercaptopropyl trimethoxy silane for dilution to prepare a 3-mercaptopropyl trimethoxy silane dilute solution; mixing the 3-mercaptopropyl trimethoxy silane dilute solution with carbonized-flocculated consolidated mud powder, uniformly stirring, standing, and performing solid-liquid separation to obtain mercapto-modified carbonized-flocculated consolidated mud powder; and (3) mixing the sulfydryl modified carbonized and flocculated consolidated sludge powder, the fly ash, the lime and the flocculated river sediment, uniformly stirring and aging to obtain the detoxified sediment.
Description
Technical Field
The invention belongs to the field of heavy metal contaminated soil remediation, and relates to a detoxification method of thallium-contaminated river sediment.
Background
Thallium is a highly toxic heavy metal element, generally has a lethal dose of 12mg/kg, can be absorbed by human body through intestinal tract and respiratory tract, and causes symptoms such as nausea, vomiting, abdominal colic, diarrhea, optic atrophy, muscular atrophy, toxic encephalopathy and the like. The thallium content in the water body is generally less than 0.05 mug/L under the natural background, and the thallium concentration in the drinking water is definitely not more than 0.1 mug/L according to the sanitary Standard for Drinking Water (GB 5749) in China. Thallium slag and tailings illegally dumped caused by disordered mining of thallium-containing ore deposits, private discharge of thallium-containing industrial wastewater, excessive use of thallium-containing chemical fertilizers and the like easily cause significant increase of thallium content in surrounding soil and water, and obvious thallium pollution is caused.
Thallium pollutant which excessively enters soil and water cannot be removed through ecological degradation, but can cause harm to animals and plants in a polluted area through food chain enrichment. Thallium entering the river channel can be adsorbed into the bottom sediment of the river channel and released into the water body again from the bottom sediment after flood and heavy rain, thus causing continuous pollution of wider area. Therefore, the method solves the problem of thallium pollution in the river water body, and realizes the detoxification of the river sediment is the key.
Disclosure of Invention
The invention aims to: the invention aims to provide a detoxification method of thallium-polluted river sediment, which can obviously improve the thallium pollution condition of the river sediment.
The technical scheme is as follows: the invention provides a detoxification method of thallium-polluted river sediment, which comprises the following steps:
1) Mixing a sulfur-based flocculant into the thallium-polluted river sediment, uniformly stirring, standing, and performing solid-liquid separation to obtain flocculated river sediment;
2) Drying, grinding and carbonizing the flocculated river sediment in a carbonization furnace to obtain carbonized flocculated consolidated mud powder;
3) Mixing 3-mercaptopropyl trimethoxy silane dilute solution with carbonized, flocculated and consolidated mud powder to ensure that the 3-mercaptopropyl trimethoxy silane is adsorbed on carbonized, flocculated and consolidated mud powder particles and wraps the carbonized, flocculated and consolidated mud powder particles; stirring uniformly, standing, and performing solid-liquid separation to obtain sulfydryl modified carbonized-flocculated consolidated mud powder;
4) Mixing the sulfydryl modified carbonization flocculation consolidation mud powder, the fly ash, the lime and the flocculation river sediment, so that sulfydryl loaded on the sulfydryl modified carbonization flocculation consolidation mud powder can selectively adsorb thallium pollutants leached from pore liquid of the flocculation river sediment, and the sulfydryl modified carbonization flocculation consolidation mud powder is stabilized on the sulfydryl modified carbonization flocculation consolidation mud powder in a complexing coordination mode; and then stirring uniformly and aging, and generating geopolymerization reaction and hydration reaction to generate an ettringite intercalated geopolymer through the alkali excitation among the sulfydryl modified carbonized flocculation consolidated mud powder, the fly ash, the lime and the flocculated river sediment and the flocculant hydroxyl sweeping action, thereby realizing the thorough detoxification of the thallium-polluted river sediment.
Wherein the mass ratio of the thallium-polluted river sediment to the sulfur-based flocculant is 100.
Wherein the sulfur flocculant is one or two of polyaluminium sulfate flocculant or polyaluminium ferric sulfate flocculant.
Wherein the standing time in the step 1) is 5-15 minutes, so that sludge particles are agglomerated and precipitated, and thallium pollutants in the liquid are enriched in the bottom sludge.
Wherein the carbonization time in the step 2) is 3-12 hours, and the carbonization temperature is 275-1050 ℃. Further, preferably, the carbonization temperature of the carbonization furnace is 300 ℃ to 900 ℃.
Wherein, the volume ratio of the 3-mercaptopropyltrimethoxysilane to the water in the dilute solution of the 3-mercaptopropyltrimethoxysilane in the step 3) is 1.
Wherein the liquid-solid ratio of the 3-mercaptopropyl trimethoxy silane dilute solution to the carbonized, flocculated and consolidated mud powder is 0.25-4. Preferably, the liquid-solid ratio of the 3-mercaptopropyltrimethoxysilane dilute solution to the carbonized-flocculated consolidated mud powder is 0.5-2.5.
Wherein the standing time in the step 3) is 2 to 12 hours.
Wherein, in the step 4), the mass ratio of the mixed sulfydryl modified carbonized-flocculated consolidated mud powder to the fly ash to the lime to the flocculated river sediment is 2.5-17.5.
Wherein the aging time in the step 4) is 12 to 36 hours.
The reaction mechanism is as follows: the sulfur flocculant is mixed into the thallium-polluted river sediment, so that the sludge particles can be agglomerated and precipitated, and thallium pollutants in the liquid can be enriched into the sediment. Moreover, in the carbonization process, in addition to the organic matter in the bottom sludge being converted into carbon-based materials (particles) and sulfate radicals in the sulfur-based flocculant being reduced to sulfides, the environmental migration activity of thallium is suppressed by forming sulfide precipitates with thallium contaminants. 3-mercaptopropyl trimethoxy silane dilute solution is mixed with carbonized, flocculated and consolidated mud powder, and 3-mercaptopropyl trimethoxy silane is adsorbed on carbonized, flocculated and consolidated mud powder particles and wraps the carbonized, flocculated and consolidated mud powder particles, so that the cohesiveness of the carbonized, flocculated and consolidated mud powder particles, fly ash, lime and flocculated river sediment is improved. Meanwhile, in the mixing and stirring process of the sulfydryl modified carbonized and flocculated consolidated mud powder, the fly ash, the lime and the flocculated river sediment, the sulfydryl loaded on the sulfydryl modified carbonized and flocculated consolidated mud powder can selectively adsorb thallium pollutants leached from the pore liquid of the flocculated river sediment and is stabilized on the sulfydryl modified carbonized and flocculated consolidated mud powder in a complexing coordination mode. The sulfydryl modified carbonized and flocculated consolidated mud powder, the fly ash, the lime and the flocculated river sediment are subjected to geopolymerization reaction and hydration reaction under the alkali excitation effect and the flocculating agent hydroxyl sweeping effect to generate an ettringite intercalated geopolymer, so that the thallium-polluted river sediment is thoroughly detoxified.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: the preparation method is simple in preparation process, the sulfydryl modified carbonized-flocculated consolidated mud powder is prepared by using part of thallium-polluted bottom mud, and a small amount of fly ash and lime are matched for repairing the thallium-polluted bottom mud. The method not only can realize effective stabilization of thallium pollution in the bottom sediment of the river channel and obviously reduce thallium leaching concentration, the minimum leaching concentration is only 0.0034 mug/L, but also obviously improves the tiltability of the bottom sediment of the river channel after restoration, and the relative root growth ratio of the rice root system can reach 134 percent at most.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and examples.
The following examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention.
The examples, in which specific conditions are not specified, were carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are conventional products which are commercially available, and are not indicated by manufacturers.
Preparing thallium-polluted river sediment: weighing 1kg of uncontaminated soil sample, then doping 50mg of thallium into the soil sample, adding water into the soil according to the liquid-solid ratio of 1.
Example 1 influence of carbonization temperature of carbonization furnace on detoxification effect of thallium-contaminated river sediment
Mixing the thallium-polluted river sediment and a sulfur-based flocculant according to the mass ratio of 100.5, uniformly stirring, standing for 5 minutes, and performing solid-liquid separation to obtain the flocculated river sediment, wherein the sulfur-based flocculant is a polyaluminium sulfate flocculant. Drying and grinding the flocculated river sediment, and then placing the ground sediment into a carbonization furnace for carbonization treatment for 3 hours to obtain carbonized and flocculated consolidated sludge powder, wherein the carbonization temperature of the carbonization furnace is 275 ℃, 280 ℃, 290 ℃, 300 ℃, 600 ℃, 900 ℃, 950 ℃, 1000 ℃ and 1050 ℃. Adding water into 3-mercaptopropyl trimethoxy silane, diluting by 10 times, and preparing 3-mercaptopropyl trimethoxy silane dilute solution. Mixing 3-mercaptopropyl trimethoxy silane dilute solution and carbonized-flocculated consolidated mud powder according to the liquid-solid ratio of 0.5 (1 mL/g), uniformly stirring, standing for 2 hours, and carrying out solid-liquid separation to obtain the mercapto-modified carbonized-flocculated consolidated mud powder. And (2) mixing sulfydryl modified carbonized-flocculated consolidated mud powder, fly ash, lime and flocculated river sediment according to a mass ratio of 2.5.
Toxicity leaching test: and (3) carrying out a toxicity leaching test on the repaired soil sample according to a solid waste leaching toxicity leaching method sulfuric acid-nitric acid method (HJ/T299-2007).
And (3) thallium ion concentration detection: thallium concentration in leachate measurement by graphite furnace atomic absorption spectrophotometry (HJ 748-2015).
And (3) repairing the root growth of the soil: the experiment of the root system growth of rice plants in uncontaminated sediment Soil (as a blank control) and the experiment of the root system growth of rice plants in detoxified sediment Soil are performed according to the international standard "Soil quality-Determination of the effects of pollutants on Soil flora-Part 1: method for the measurement of inhibition of root growth (ISO 11269-1-2012). And (4) calculating the relative root growth ratio of the rice according to the test result (the relative root growth ratio of the rice = the root growth length of the rice plant in the soil with the detoxified bottom sediment/the root growth length of the rice plant in the soil with the uncontaminated bottom sediment).
The test results of this example are shown in Table 1.
TABLE 1 influence of carbonization temperature of carbonization furnace on detoxification effect of thallium-contaminated river sediment
| Carbonization temperature of carbonization furnace | Thallium extraction concentration (mg/L) | Relative root growth ratio of rice |
| 275℃ | 0.242 | 103.48％ |
| 280℃ | 0.215 | 108.57％ |
| 290℃ | 0.133 | 111.64％ |
| 300℃ | 0.087 | 115.45％ |
| 600℃ | 0.076 | 118.71％ |
| 900℃ | 0.063 | 122.38％ |
| 950℃ | 0.092 | 113.94％ |
| 1000℃ | 0.145 | 109.36％ |
| 1050℃ | 0.267 | 105.95％ |
As can be seen from table 1, when the carbonization temperature of the carbonization furnace is less than 300 ℃ (for example, in table 1, when the carbonization temperature of the carbonization furnace is =290 ℃, 280 ℃, 275 ℃ and lower values not listed in table 1), the carbonization temperature of the carbonization furnace is too low, thallium-polluted river sediment is insufficiently carbonized, the reduction efficiency of sulfate radicals in the sulfur-based flocculant is reduced, and the cohesiveness of the carbonized-flocculated consolidated dust particles with the fly ash, lime and flocculated river sediment is deteriorated, so that the thallium leaching concentration of the detoxified thallium-polluted river sediment is significantly increased along with the reduction of the carbonization temperature of the carbonization furnace, and the relative root growth ratio of rice is significantly reduced along with the reduction of the carbonization temperature of the carbonization furnace. When the carbonization temperature of the carbonization furnace is equal to 300 ℃ to 900 ℃ (when the carbonization temperature of the carbonization furnace is =300 ℃, 600 ℃, 900 ℃, as in table 1), in addition to the organic matter in the bottom sludge, the carbon-based material (particles) can be converted and the sulfate radical in the sulfur-based flocculant can be reduced to sulfide during carbonization, and the environmental migration activity of thallium is inhibited by forming sulfide precipitates with thallium contaminants. Finally, the thallium leaching concentration of the thallium-polluted substrate sludge after detoxification is lower than 0.09mg/L, and the growth ratio of the rice relative to the root system is larger than 115%. When the carbonization temperature of the carbonization furnace is more than 900 ℃ (for example, in table 1, the carbonization temperature of the carbonization furnace is =950 ℃, 1000 ℃, 1050 ℃ and higher values not listed in table 1), thallium pollutes the river sediment and is overburnt, sulfate radicals in the sulfur-based flocculant are combined with calcium and aluminum elements to generate low-activity particles, so that thallium leaching concentration of the detoxified thallium polluted river sediment is obviously increased along with the further increase of the carbonization temperature of the carbonization furnace, and the relative root growth ratio of rice is obviously reduced along with the decrease of the carbonization temperature of the carbonization furnace. Therefore, in summary, the benefit and the cost are combined, and when the carbonization temperature of the carbonization furnace is equal to 300-900 ℃, the detoxification and restoration of the thallium-polluted bottom sediment are most favorably realized.
Example 23 Effect of mercaptopropyltrimethoxysilane dilute solution and the liquid-solid ratio of carbonized flocculation consolidated mud powder on detoxification effect of thallium-contaminated river sediment
Mixing the thallium-polluted river sediment and a sulfur-based flocculant according to the mass ratio of 100.5, uniformly stirring, standing for 10 minutes, and performing solid-liquid separation to obtain the flocculated river sediment, wherein the sulfur-based flocculant is a polyaluminium sulfate flocculant. And (3) drying and grinding the bottom sludge of the flocculation riverway, and then placing the bottom sludge in a carbonization furnace for carbonization treatment for 7.5 hours to obtain carbonized flocculation consolidated sludge powder, wherein the carbonization temperature of the carbonization furnace is 900 ℃. Adding water into 3-mercaptopropyl trimethoxy silane, diluting by 55 times, and preparing 3-mercaptopropyl trimethoxy silane dilute solution. The following components (1) are mixed according to the liquid-solid ratio of 0.25 ml, 0.3 ml. And (2) mixing sulfydryl modified carbonized and flocculated consolidated sludge powder, fly ash, lime and flocculated river sediment according to the mass ratio of 10.
The toxicity leaching test, the thallium ion concentration detection and the detection of the root system growth of the restored soil are the same as the example 1.
The test results of this example are shown in Table 2.
TABLE 2 influence of the liquid-solid ratio of the dilute mercaptopropyltrimethoxysilane solution and the carbonized flocculation consolidated mud powder on the detoxification effect of the thallium-contaminated river sediment
As can be seen from table 2, when the liquid-solid ratio of the 3-mercaptopropyl trimethoxysilane dilute solution to the carbonized-flocculated consolidated mud powder is less than 0.5 g (as in table 2, the liquid-solid ratio of the 3-mercaptopropyl trimethoxysilane dilute solution to the carbonized-flocculated consolidated mud powder = 0.4. When the liquid-solid ratio of the 3-mercaptopropyl trimethoxy silane dilute solution to the carbonized-flocculated consolidated mud powder is equal to 0.5-2.5 (as shown in Table 2, the liquid-solid ratio of the 3-mercaptopropyl trimethoxy silane dilute solution to the carbonized-flocculated consolidated mud powder is = 0.5. Meanwhile, in the mixing and stirring process of the sulfydryl modified carbonized and flocculated consolidated mud powder, the fly ash, the lime and the flocculated river sediment, the sulfydryl loaded on the sulfydryl modified carbonized and flocculated consolidated mud powder can selectively adsorb thallium pollutants leached from the pore liquid of the flocculated river sediment and is stabilized on the sulfydryl modified carbonized and flocculated consolidated mud powder in a complexing coordination mode. Finally, the thallium leaching concentration of the detoxified substrate sludge is lower than 0.05mg/L, and the relative root growth ratio of the rice is higher than 126%. When the liquid-solid ratio of the 3-mercaptopropyl trimethoxy silane dilute solution to the carbonized-flocculated consolidated mud powder is more than 2.5 g (as in table 2, the liquid-solid ratio of the 3-mercaptopropyl trimethoxy silane dilute solution to the carbonized-flocculated consolidated mud powder is = 3. Therefore, in summary, combining the benefits and the cost, when the liquid-solid ratio of the 3-mercaptopropyltrimethoxysilane dilute solution to the carbonized-flocculated consolidated sludge powder is equal to 0.5-2.5 g, the method is most beneficial to realizing detoxification and restoration of the thallium-polluted substrate sludge.
Example 3 the effect of the mass ratio of the sulfydryl modified carbonized and flocculated consolidated mud powder, fly ash, lime and flocculated river sediment on the detoxification effect of thallium-polluted river sediment
Mixing the thallium-polluted river sediment and a sulfur-based flocculant according to the mass ratio of 100.5, uniformly stirring, standing for 15 minutes, and performing solid-liquid separation to obtain the flocculated river sediment, wherein the sulfur-based flocculant is a polyaluminium sulfate flocculant. And (3) drying and grinding the bottom sludge of the flocculation riverway, and then placing the bottom sludge in a carbonization furnace for carbonization treatment for 12 hours to obtain carbonized flocculation consolidated sludge powder, wherein the carbonization temperature of the carbonization furnace is 900 ℃. Adding water into 3-mercaptopropyl trimethoxy silane, diluting by 100 times, and preparing 3-mercaptopropyl trimethoxy silane dilute solution. Mixing 3-mercaptopropyl trimethoxy silane dilute solution and carbonized-flocculated consolidated mud powder according to the liquid-solid ratio of 2.5 mL. The following features are provided for the following features.
The toxicity leaching test, the thallium ion concentration detection and the detection of the root system growth of the restored soil are the same as those in the example 1.
The test results of this example are shown in Table 3.
TABLE 3 influence of the quality of sulfydryl modified carbonized and flocculated consolidated mud powder, fly ash, lime and flocculated river sediment on the detoxification effect of thallium-polluted river sediment
As can be seen from table 3, when the mass ratio of the mixed sulfhydryl-modified carbonized-flocculated consolidated mud powder to the fly ash to the lime to the flocculated river sediment is equal to 2.5-17.5, i.e. 5-15, in the mixing and stirring process of the sulfhydryl-modified carbonized-flocculated consolidated mud powder to the fly ash to the lime to the flocculated river sediment, the sulfhydryl loaded on the sulfhydryl-modified carbonized-flocculated consolidated mud powder can selectively adsorb thallium pollutants leached from the pore liquid of the flocculated river sediment and is stabilized on the sulfhydryl-modified carbonized-flocculated consolidated mud powder by a complex coordination manner. The sulfydryl modified carbonized flocculation consolidated mud powder, the fly ash, the lime and the flocculated river sediment are subjected to geopolymerization reaction and hydration reaction under the alkali excitation effect and the flocculating agent hydroxyl sweeping effect to generate an ettringite intercalated geopolymer, so that the thallium-polluted river sediment is thoroughly detoxified. Finally, the thallium leaching concentration of the detoxified substrate sludge is lower than 0.008mg/L, and the relative root growth ratio of the rice is higher than 131%.
Example 4 influence of Sulfur flocculant on detoxification of thallium-contaminated river sediment
Mixing the thallium-polluted river sediment and a sulfur-based flocculant according to the mass ratio of 100.5, uniformly stirring, standing for 15 minutes, and performing solid-liquid separation to obtain the flocculated river sediment, wherein the sulfur-based flocculant is a polymeric aluminum ferric sulfate flocculant. And (3) drying and grinding the bottom sludge of the flocculation river, and then placing the bottom sludge in a carbonization furnace for carbonization treatment for 12 hours to obtain carbonized flocculation consolidation sludge powder, wherein the carbonization temperature of the carbonization furnace is 900 ℃. Adding water into 3-mercaptopropyl trimethoxy silane, diluting by 100 times, and preparing 3-mercaptopropyl trimethoxy silane dilute solution. Mixing 3-mercaptopropyl trimethoxy silane dilute solution and carbonized-flocculated consolidated mud powder according to the liquid-solid ratio of 2.5 mL. And (2) mixing sulfydryl modified carbonized-flocculated consolidated sludge powder, fly ash, lime and flocculated river sediment according to the mass ratio of 17.5.
The toxicity leaching test, the thallium ion concentration detection and the detection of the root system growth of the restored soil are the same as the example 1.
The test results of this example are shown in Table 4.
TABLE 4 influence of sulfur-series flocculant on detoxification effect of thallium-polluted river sediment
| Sulfur flocculant | Thallium leaching concentration (mg/L) | Relative root growth ratio of rice |
| Flocculant of polyaluminium sulfate | 0.0052 | 132.54％ |
| Polymeric aluminum ferric sulfate flocculant | 0.0049 | 133.62％ |
As can be seen from Table 4, the detoxification substrate sludge thallium leaching concentration realized by selecting the polyaluminium ferric sulfate flocculant as the sulfur flocculant is 0.0049mg/L, the relative root growth ratio of rice is 133.62%, and the result is close to that of the polyaluminium sulfate flocculant, and the detoxification of the thallium-polluted river substrate sludge can be effectively realized.
Claims (10)
1. A detoxification method of thallium-polluted river sediment is characterized by comprising the following steps:
1) Mixing a sulfur-based flocculant into the thallium-polluted river sediment, uniformly stirring, standing, and performing solid-liquid separation to obtain flocculated river sediment;
2) Drying, grinding and carbonizing the flocculated river sediment in a carbonization furnace to obtain carbonized and flocculated consolidated mud powder;
3) Mixing the 3-mercaptopropyl trimethoxy silane dilute solution with carbonized-flocculated consolidated mud powder, uniformly stirring, standing, and performing solid-liquid separation to obtain mercapto-modified carbonized-flocculated consolidated mud powder;
4) And (3) mixing the sulfydryl modified carbonized and flocculated consolidated sludge powder, the fly ash, the lime and the flocculated river sediment, uniformly stirring and aging to obtain the detoxified sediment.
2. The method for detoxifying thallium-contaminated river sediment according to claim 1, wherein the mass ratio of the thallium-contaminated river sediment to the sulfur-based flocculant is 100.
3. The method for detoxifying thallium-contaminated river sediment according to claim 1, wherein the sulfur-based flocculant in step 1) is one or both of a polyaluminium sulfate flocculant and a polyaluminum ferric sulfate flocculant.
4. The method for detoxifying thallium-contaminated river sediment according to claim 1, wherein the standing time in step 1) is 5-15 minutes.
5. The method for detoxifying thallium-contaminated river sediment according to claim 1, wherein the carbonization time in step 2) is 3-12 hours, and the carbonization temperature is 275-1050 ℃.
6. The method for detoxifying thallium-contaminated river sediment according to claim 1, wherein the volume ratio of 3-mercaptopropyltrimethoxysilane to water in the dilute 3-mercaptopropyltrimethoxysilane solution in step 3) is 1.
7. The method for detoxifying thallium-polluted river sediment according to claim 1, wherein the liquid-solid ratio of the dilute 3-mercaptopropyl trimethoxy silane solution to the carbonized, flocculated, consolidated mud powder in step 3) is 0.25-4.
8. The method for detoxifying thallium-contaminated river sediment according to claim 1, wherein the standing time in step 3) is 2-12 hours.
9. The method for detoxifying thallium-polluted river sediment according to claim 1, wherein in step 4), the mass ratio of the sulfhydryl-modified carbonized-flocculated consolidated mud powder to the fly ash to the lime to the flocculated river sediment is 2.5-17.5.
10. The method for detoxifying thallium-contaminated river sediment according to any one of claims 1 to 9, wherein the aging time in step 4) is 12 to 36 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210845803.1A CN115215519B (en) | 2022-07-19 | 2022-07-19 | Detoxification method of thallium-polluted river sediment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210845803.1A CN115215519B (en) | 2022-07-19 | 2022-07-19 | Detoxification method of thallium-polluted river sediment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115215519A true CN115215519A (en) | 2022-10-21 |
| CN115215519B CN115215519B (en) | 2023-12-01 |
Family
ID=83611599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210845803.1A Active CN115215519B (en) | 2022-07-19 | 2022-07-19 | Detoxification method of thallium-polluted river sediment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115215519B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140115019A (en) * | 2013-03-20 | 2014-09-30 | 강원대학교산학협력단 | Manufacturing method of biochar using sewage sludge and its effect on Pb immobilization in soil |
| CN105062495A (en) * | 2015-08-17 | 2015-11-18 | 深圳市铁汉生态环境股份有限公司 | Heavy metal stabilizer |
| CN112194391A (en) * | 2020-09-16 | 2021-01-08 | 中能化江苏地质矿产设计研究院有限公司 | High-efficiency curing material for heavy metal polluted bottom mud prepared based on coal-based solid waste |
| WO2021003789A1 (en) * | 2019-07-09 | 2021-01-14 | 中国科学院城市环境研究所 | Resource utilization method of sludge pyrolysis biochar |
| CN114146683A (en) * | 2021-11-16 | 2022-03-08 | 哈尔滨工业大学 | Method for preparing carbon-based adsorption material by utilizing sewage deep treatment coagulated sludge and application thereof |
-
2022
- 2022-07-19 CN CN202210845803.1A patent/CN115215519B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140115019A (en) * | 2013-03-20 | 2014-09-30 | 강원대학교산학협력단 | Manufacturing method of biochar using sewage sludge and its effect on Pb immobilization in soil |
| CN105062495A (en) * | 2015-08-17 | 2015-11-18 | 深圳市铁汉生态环境股份有限公司 | Heavy metal stabilizer |
| WO2021003789A1 (en) * | 2019-07-09 | 2021-01-14 | 中国科学院城市环境研究所 | Resource utilization method of sludge pyrolysis biochar |
| CN112194391A (en) * | 2020-09-16 | 2021-01-08 | 中能化江苏地质矿产设计研究院有限公司 | High-efficiency curing material for heavy metal polluted bottom mud prepared based on coal-based solid waste |
| CN114146683A (en) * | 2021-11-16 | 2022-03-08 | 哈尔滨工业大学 | Method for preparing carbon-based adsorption material by utilizing sewage deep treatment coagulated sludge and application thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115215519B (en) | 2023-12-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109054848B (en) | Heavy metal contaminated soil remediation agent and preparation method and use method thereof | |
| CN107652976B (en) | Mineral-based soil remediation agent and preparation method thereof | |
| Lasheen et al. | Assessment of metals speciation in sewage sludge and stabilized sludge from different Wastewater Treatment Plants, Greater Cairo, Egypt | |
| Bhatnagar et al. | Vanadium removal from water by waste metal sludge and cement immobilization | |
| CN109762569B (en) | Heavy metal cadmium and arsenic composite contaminated soil remediation agent and preparation method thereof | |
| Gao et al. | Remediation of Cr (VI)-contaminated soil by combined chemical reduction and microbial stabilization: The role of biogas solid residue (BSR) | |
| Wang et al. | Immobilization of mercury and arsenic in a mine tailing from a typical Carlin-type gold mining site in southwestern part of China | |
| CN110104913A (en) | A kind of sediment repairing agent and its method applied to in-situ sediment remediation | |
| Hou et al. | The bioaccessibility and fractionation of arsenic in anoxic soils as a function of stabilization using low-cost Fe/Al-based materials: A long-term experiment | |
| CN111807576A (en) | Method for treating domestic garbage leachate by using domestic garbage incineration fly ash | |
| Ou et al. | Preparation of iron/calcium-modified biochar for phosphate removal from industrial wastewater | |
| WO2019212418A1 (en) | A method and system for heavy metal immobilization | |
| CN111100644A (en) | Microcapsule composite material for Cd and Pb polluted soil, preparation method and restoration method | |
| CN107721297B (en) | Solidification stabilization composition agent suitable for heavy metal slag | |
| Zhao et al. | Fractionation and solubility of cadmium in paddy soils amended with porous hydrated calcium silicate | |
| CN108821281A (en) | A kind of preparation method and sludge carbon based material of sludge carbon based material | |
| CN106242013B (en) | Method for treating heavy metal ion-containing wastewater by mixing natural pyrrhotite and zero-valent iron | |
| CN112063385B (en) | Passivating agent for efficiently fixing trivalent arsenic under anaerobic condition, and preparation method and application thereof | |
| CN212494519U (en) | Device system for treating petroleum-polluted soil | |
| CN111228711B (en) | Method for stabilizing and curing mercury-containing waste salt slag by using petrochemical waste alkali slag | |
| Li et al. | Removal of fluoride and arsenic by pilot vertical-flow constructed wetlands using soil and coal cinder as substrate | |
| CN112322301A (en) | Composite soil conditioner and application thereof | |
| CN115215519B (en) | Detoxification method of thallium-polluted river sediment | |
| Mohajeri et al. | ALLODUST augmented activated sludge single batch anaerobic reactor (AS-SBAnR) for high concentration nitrate removal from agricultural wastewater | |
| Madrid et al. | Effects of the presence of a composted biosolid on the metal immobilizing action of an urban soil |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |