CN104529101A - City sludge heavy metal passivation method by using hydroxyapatite as passivating agent - Google Patents
City sludge heavy metal passivation method by using hydroxyapatite as passivating agent Download PDFInfo
- Publication number
- CN104529101A CN104529101A CN201410707618.1A CN201410707618A CN104529101A CN 104529101 A CN104529101 A CN 104529101A CN 201410707618 A CN201410707618 A CN 201410707618A CN 104529101 A CN104529101 A CN 104529101A
- Authority
- CN
- China
- Prior art keywords
- sludge
- heavy metal
- filtrate
- municipal sludge
- hydroxyapatite
- Prior art date
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- 239000010802 sludge Substances 0.000 title claims abstract description 74
- 229910001385 heavy metals Inorganic materials 0.000 title claims abstract description 59
- 229910052588 hydroxylapatite Inorganic materials 0.000 title claims abstract description 31
- 238000002161 passivation Methods 0.000 title abstract description 35
- 239000003795 chemical substances by application Substances 0.000 title abstract 2
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 14
- 241001081830 Degeneriaceae Species 0.000 claims abstract description 12
- 239000000203 mixtures Substances 0.000 claims abstract description 11
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- 238000000034 methods Methods 0.000 abstract description 8
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- 239000011701 zinc Substances 0.000 description 11
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- 239000011133 lead Substances 0.000 description 9
- 229910052725 zinc Inorganic materials 0.000 description 9
- 229910052802 copper Inorganic materials 0.000 description 8
- 229910052793 cadmium Inorganic materials 0.000 description 7
- 229910052804 chromium Inorganic materials 0.000 description 7
- 239000002361 compost Substances 0.000 description 7
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- 241000195940 Bryophyta Species 0.000 description 1
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<text dominant-baseline="central" text-anchor="start" x='85.7391' y='220.125' style='font-size:13px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#E84235' ><tspan>O</tspan></text>
<text dominant-baseline="central" text-anchor="end" x='123.472' y='260.411' style='font-size:13px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#E84235' ><tspan>O</tspan><tspan style='baseline-shift:super;font-size:9.75px;'>-</tspan><tspan></tspan></text>
<text dominant-baseline="central" text-anchor="middle" x='152.082' y='240.168' style='font-size:13px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#FF60B7' ><tspan>P</tspan></text>
<text dominant-baseline="central" text-anchor="end" x='138.145' y='205.653' style='font-size:13px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#E84235' ><tspan>O</tspan><tspan style='baseline-shift:super;font-size:9.75px;'>-</tspan><tspan></tspan></text>
<text dominant-baseline="central" text-anchor="start" x='167.355' y='275.084' style='font-size:13px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#E84235' ><tspan>O</tspan><tspan style='baseline-shift:super;font-size:9.75px;'>-</tspan><tspan></tspan></text>
<text dominant-baseline="central" text-anchor="start" x='181.894' y='220.125' style='font-size:13px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#E84235' ><tspan>O</tspan></text>
<text dominant-baseline="central" text-anchor="end" x='27.3171' y='164.256' style='font-size:13px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#E84235' ><tspan>O</tspan><tspan style='baseline-shift:super;font-size:9.75px;'>-</tspan><tspan></tspan></text>
<text dominant-baseline="central" text-anchor="middle" x='55.9272' y='144.013' style='font-size:13px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#FF60B7' ><tspan>P</tspan></text>
<text dominant-baseline="central" text-anchor="end" x='41.9897' y='109.498' style='font-size:13px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#E84235' ><tspan>O</tspan><tspan style='baseline-shift:super;font-size:9.75px;'>-</tspan><tspan></tspan></text>
<text dominant-baseline="central" text-anchor="start" x='71.2002' y='178.929' style='font-size:13px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#E84235' ><tspan>O</tspan><tspan style='baseline-shift:super;font-size:9.75px;'>-</tspan><tspan></tspan></text>
<text dominant-baseline="central" text-anchor="start" x='85.7391' y='123.97' style='font-size:13px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#E84235' ><tspan>O</tspan></text>
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<text dominant-baseline="central" text-anchor="start" x='12.8583' y='22.9525' style='font-size:3px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#3B4143' ><tspan>Ca</tspan><tspan style='baseline-shift:super;font-size:2.25px;'>+2</tspan><tspan></tspan></text>
<text dominant-baseline="central" text-anchor="start" x='65.082' y='67.6044' style='font-size:3px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#3B4143' ><tspan>Ca</tspan><tspan style='baseline-shift:super;font-size:2.25px;'>+2</tspan><tspan></tspan></text>
<text dominant-baseline="central" text-anchor="start" x='12.8583' y='15.3807' style='font-size:3px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#3B4143' ><tspan>Ca</tspan><tspan style='baseline-shift:super;font-size:2.25px;'>+2</tspan><tspan></tspan></text>
<text dominant-baseline="central" text-anchor="start" x='72.6538' y='67.6044' style='font-size:3px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#3B4143' ><tspan>Ca</tspan><tspan style='baseline-shift:super;font-size:2.25px;'>+2</tspan><tspan></tspan></text>
<text dominant-baseline="central" text-anchor="start" x='12.8583' y='7.80888' style='font-size:3px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#3B4143' ><tspan>Ca</tspan><tspan style='baseline-shift:super;font-size:2.25px;'>+2</tspan><tspan></tspan></text>
<text dominant-baseline="central" text-anchor="end" x='7.23985' y='73.2833' style='font-size:3px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#E84235' ><tspan>O</tspan><tspan style='baseline-shift:super;font-size:2.25px;'>-</tspan><tspan></tspan></text>
<text dominant-baseline="central" text-anchor="middle" x='15.3461' y='67.5476' style='font-size:3px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#FF60B7' ><tspan>P</tspan></text>
<text dominant-baseline="central" text-anchor="end" x='11.3971' y='57.7683' style='font-size:3px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#E84235' ><tspan>O</tspan><tspan style='baseline-shift:super;font-size:2.25px;'>-</tspan><tspan></tspan></text>
<text dominant-baseline="central" text-anchor="start" x='19.6734' y='77.4405' style='font-size:3px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#E84235' ><tspan>O</tspan><tspan style='baseline-shift:super;font-size:2.25px;'>-</tspan><tspan></tspan></text>
<text dominant-baseline="central" text-anchor="start" x='23.7928' y='61.8687' style='font-size:3px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#E84235' ><tspan>O</tspan></text>
<text dominant-baseline="central" text-anchor="end" x='34.4838' y='73.2833' style='font-size:3px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#E84235' ><tspan>O</tspan><tspan style='baseline-shift:super;font-size:2.25px;'>-</tspan><tspan></tspan></text>
<text dominant-baseline="central" text-anchor="middle" x='42.59' y='67.5476' style='font-size:3px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#FF60B7' ><tspan>P</tspan></text>
<text dominant-baseline="central" text-anchor="end" x='38.6411' y='57.7683' style='font-size:3px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#E84235' ><tspan>O</tspan><tspan style='baseline-shift:super;font-size:2.25px;'>-</tspan><tspan></tspan></text>
<text dominant-baseline="central" text-anchor="start" x='46.9174' y='77.4405' style='font-size:3px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#E84235' ><tspan>O</tspan><tspan style='baseline-shift:super;font-size:2.25px;'>-</tspan><tspan></tspan></text>
<text dominant-baseline="central" text-anchor="start" x='51.0367' y='61.8687' style='font-size:3px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#E84235' ><tspan>O</tspan></text>
<text dominant-baseline="central" text-anchor="end" x='7.23985' y='46.0393' style='font-size:3px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#E84235' ><tspan>O</tspan><tspan style='baseline-shift:super;font-size:2.25px;'>-</tspan><tspan></tspan></text>
<text dominant-baseline="central" text-anchor="middle" x='15.3461' y='40.3036' style='font-size:3px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#FF60B7' ><tspan>P</tspan></text>
<text dominant-baseline="central" text-anchor="end" x='11.3971' y='30.5243' style='font-size:3px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#E84235' ><tspan>O</tspan><tspan style='baseline-shift:super;font-size:2.25px;'>-</tspan><tspan></tspan></text>
<text dominant-baseline="central" text-anchor="start" x='19.6734' y='50.1965' style='font-size:3px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#E84235' ><tspan>O</tspan><tspan style='baseline-shift:super;font-size:2.25px;'>-</tspan><tspan></tspan></text>
<text dominant-baseline="central" text-anchor="start" x='23.7928' y='34.6248' style='font-size:3px;font-style:normal;font-weight:normal;fill-opacity:1;stroke:none;font-family:sans-serif;fill:#E84235' ><tspan>O</tspan></text>
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- 239000002367 phosphate rock Substances 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N phosphorus Chemical compound 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[P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N potassium Chemical compound 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[K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 239000000047 products Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
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
-
- 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
Abstract
Description
Technical field
The present invention relates to a kind of method of disposal of municipal sludge.
Background technology
In recent years, along with the continuous expansion of city size, a large amount of newly-built sewage treatment facility puts into operation, and along with a large amount of generations of mud, becomes the potential object of environmental pollution, become more and more urgent to the recycling of mud.Containing abundant nitrogen, phosphorus, potassium and organic matter in mud, it is good Organic Fertilizer Resources.The chemical composition of mud is very complicated, containing miscellaneous heavy metal, when the mud that heavy metal content exceeds standard is for agroforestry, can cause the heavy metal contamination of soil.Heavy metal element and compound thereof are the chemical substances or can not being difficult to degraded, enter the heavy metal after soil and are generally difficult to remove, can be penetrated in underground water be detrimental to health by plant absorption or transudation.Therefore, find a kind of effective ways of passivation Heavy Metals in Sludge thus realize agricultural sludge and just seem very important and very urgent.
To this, forefathers have done a large amount of research work, also achieve many achievements.Li Guoxue etc. " add passivator on sludge composting process in heavy metal (Cu, Zn, Mn) form impact " in report, after utilizing municipal sludge and straw to carry out During High-Temperature Composting process, for Heavy Metals in Sludge Cu, Zn, Mn, after compost, it can utilize the content of state to reduce 3.49%, 5.01%, 13.90% respectively than before compost.
Lv Yan etc. point out in " high-rate composting is on the impact of Heavy Metals in Sludge ", the content of heavy metal (Zn, Cu, Ni, Cd, Pb, Cr) in mud and compost product thereof and chemical form are analyzed, find that compost is after 15 days, the unstable form ratio of the Zn that in mud, content is higher is down to the activity of 16%, Zn by 37% and toxicity reduces greatly; In addition the stable form proportion of the element such as Ni, Cd, Pb, Cr also has and raises in various degree.
The experimental result display in " attapulgite to domestic sludge in the passivation of heavy metal " literary composition such as Wang Shouhong, domestic sludge with the addition of after recessed soil carries out the cultivation of 30 days, and its Pb, Cd, Cu, Ni, Cr, Zn etc. 6 heavy metal species full dose value all declines than primary sludge.This passivation is mainly manifested in the starting stage of test, and the maximum passivation amount of Pb, Cd, Cu, Ni, Cr, Zn is respectively 0.66%, 3.70%, 1.74%, 1.23%, 0.49%, 3.51%.During to off-test, recessed soil reduces all to some extent to Pb, Cd, Ni, Zn passivation amount, only has passivation effect to Cu, Cr.
Ge Xiao etc. point out in the research of heavy metal passivation rule and influence factor " in the municipal sludge composting process ", through the compost treatment of 90 days, the heavy metal of the acid-soluble state in mud and reducible state is changed to more stable oxidable state and residual form, significantly reduces the biological effectiveness of heavy metal.At the end of compost, Cu, Zn, Ni, Cd, Cr, Pb six heavy metal species residual form content are more initial than compost increases all to some extent, and amplification reaches 6.3%, 6.7%, 22.0%, 15.2%, 11.0%, 40.5% respectively.
Yao Lan etc. have studied in " different passivator is on the influence research of sludge composting heavy metals in process form " literary composition flyash, ground phosphate rock, zeolite and the peat composed of rotten mosses 4 kinds of passivator on sludge composting in the impact of heavy metal (Cu, Zn, Pb, Cr) form.Experimental period is 6 days, and its result shows, the most remarkable with the passivation effect of flyash.Different passivator is different to the passivation effect of different heavy metals, and the increase rate of heavy metal residual form is as follows: Cu (0.53 ~ 8.06%), Zn (5.63 ~ 16.46%), Pb (1.10 ~ 4.32%), Cr (-1.76 ~ 3.10%).
Summary of the invention
Technical problem to be solved by this invention is to provide the passivating method of heavy metal in a kind of shorter municipal sludge consuming time, with the recycling of accelerate sludge.
Technical scheme of the present invention is:
Adopt hydroxyapatite to do a municipal sludge heavy metal passivating method for passivator, this heavy metal passivating method comprises the following steps:
Step one is 100:1 ~ 100:5 feeding by the mass ratio of municipal sludge and chemical pure hydroxyapatite;
Step 2 municipal sludge mixes with the quality proportioning of chemical pure hydroxyapatite by step one, is placed in hydrothermal reaction kettle, stirs 15 ~ 30min, generates the mixture of municipal sludge and chemical pure hydroxyapatite;
The hydrothermal reaction kettle that step 2 uses is heated to 110 DEG C ~ 140 DEG C by step 3, soaking time 4 ~ 12h, generates the municipal sludge that heavy metal is passivated.
The municipal sludge that the heavy metal of generation is passivated is gone out still, filters out filtrate and filtrate.
Municipal sludge described in step one is the municipal sludge do not dewatered.
The present invention compares had beneficial effect with prior art:
The method compares existing passivating technique, is characterized in that the reaction times is short, integrates sludge dewatering, heavy metal passivation.Adopt BCR improved method to do Heavy Metals to filtrate to extract, find under hydroxyapatite effect, reducible state (T3) and oxidable state (T4) transform to residual form (T5), and each heavy metal species residual form (T5) increase rate is as follows: Hg (28% ~ 36%), As (12% ~ 20%), Pb (26% ~ 34%), Fe (45% ~ 62%), Cr (62% ~ 81%), Cd (11% ~ 24%).
Embodiment
Embodiment one
Step one is 100:1 feeding by the mass ratio of the municipal sludge do not dewatered and chemical pure hydroxyapatite;
The municipal sludge that step 2 is not dewatered mixes with the quality proportioning of chemical pure hydroxyapatite by step one, is placed in hydrothermal reaction kettle, stirs 15min, generates the mixture of municipal sludge and the chemical pure hydroxyapatite do not dewatered;
The hydrothermal reaction kettle that step 2 uses is heated to 110 DEG C by step 3, soaking time 12h, generates the municipal sludge that heavy metal is passivated.
The municipal sludge that the heavy metal of generation is passivated is gone out still, filters out filtrate and filtrate.
Adopt BCR improved method, analyze Heavy Metals and corresponding component concentration in the filtrate generated: the filtrate 0.5000g getting oven dry is in 50mL polypropylene centrifuge tube, and the extracting condition required according to BCR improved method and step carry out lixiviate.Sample arranges 3 Duplicate Samples (determination data is 3 mean values measured), and arranges blank.Before and after mud passivation in filtrate the comparison of residual form (T5) percentage as table 1:
The comparison of residual form (T5) percentage in filtrate before and after the passivation of table 1 mud
By the analysis of data in his-and-hers watches 1, can find out that this method is to residual form (T5) successful improving Heavy Metals in Sludge.Before and after mud passivation in filtrate the amplification of residual form (T5) percentage as table 2:
The amplification of residual form (T5) percentage in filtrate before and after the passivation of table 2 mud
Embodiment two
Step one is 100:3 feeding by the mass ratio of the municipal sludge do not dewatered and chemical pure hydroxyapatite;
The municipal sludge that step 2 is not dewatered mixes with the quality proportioning of chemical pure hydroxyapatite by step one, is placed in hydrothermal reaction kettle, stirs 20min, generates the mixture of municipal sludge and the chemical pure hydroxyapatite do not dewatered;
The hydrothermal reaction kettle that step 2 uses is heated to 120 DEG C by step 3, soaking time 8h, generates the municipal sludge that heavy metal is passivated.
The municipal sludge that the heavy metal of generation is passivated is gone out still, filters out filtrate and filtrate.
Adopt BCR improved method, analyze Heavy Metals and corresponding component concentration in the filtrate generated: the filtrate 0.5000g getting oven dry is in 50mL polypropylene centrifuge tube, and the extracting condition required according to BCR improved method and step carry out lixiviate.Sample arranges 3 Duplicate Samples (determination data is 3 mean values measured), and arranges blank.Before and after mud passivation in filtrate the comparison of residual form (T5) percentage as table 3:
The comparison of residual form (T5) percentage in filtrate before and after the passivation of table 3 mud
By the analysis of data in his-and-hers watches 3, can find out that this method is to residual form (T5) successful improving Heavy Metals in Sludge.Before and after mud passivation in filtrate the amplification of residual form (T5) percentage as table 4:
The amplification of residual form (T5) percentage in filtrate before and after the passivation of table 4 mud
Embodiment three
Step one is 100:5 feeding by the mass ratio of the municipal sludge do not dewatered and chemical pure hydroxyapatite;
The municipal sludge that step 2 is not dewatered mixes with the quality proportioning of chemical pure hydroxyapatite by step one, is placed in hydrothermal reaction kettle, stirs 30min, generates the mixture of municipal sludge and the chemical pure hydroxyapatite do not dewatered;
The hydrothermal reaction kettle that step 2 uses is heated to 140 DEG C by step 3, soaking time 4h, generates the municipal sludge that heavy metal is passivated.
The municipal sludge that the heavy metal of generation is passivated is gone out still, filters out filtrate and filtrate.
Adopt BCR improved method, analyze Heavy Metals and corresponding component concentration in the filtrate generated: the filtrate 0.5000g getting oven dry is in 50mL polypropylene centrifuge tube, and the extracting condition required according to BCR improved method and step carry out lixiviate.Sample arranges 3 Duplicate Samples (determination data is 3 mean values measured), and arranges blank.Before and after mud passivation in filtrate the comparison of residual form (T5) percentage as table 5:
The comparison of residual form (T5) percentage in filtrate before and after the passivation of table 5 mud
By the analysis of data in his-and-hers watches 5, can find out that this method is to residual form (T5) successful improving Heavy Metals in Sludge.Before and after mud passivation in filtrate the amplification of residual form (T5) percentage as table 6:
The amplification of residual form (T5) percentage in filtrate before and after the passivation of table 6 mud
Embodiment four
Step one is 100:1 feeding by the mass ratio of the municipal sludge do not dewatered and chemical pure hydroxyapatite;
The municipal sludge that step 2 is not dewatered mixes with the proportioning of chemical pure hydroxyapatite by step one, is placed in water heating kettle, stirs 15min, generates the mixture of municipal sludge and the chemical pure hydroxyapatite do not dewatered;
The water heating kettle that step 2 uses is heated to after 110 DEG C by step 3, soaking time 4h, generates the municipal sludge that heavy metal is passivated.
The mud that reaction generates is gone out still, filters out filtrate and filtrate.
Adopt BCR improved method, analyze Heavy Metals and corresponding component concentration in the filtrate generated: the filtrate 0.5000g getting oven dry is in 50mL polypropylene centrifuge tube, and the extracting condition required according to BCR improved method and step carry out lixiviate.Sample arranges 3 Duplicate Samples (determination data is 3 mean values measured), and arranges blank.Before and after mud passivation in filtrate the comparison of residual form (T5) percentage as table 7:
The comparison of residual form (T5) percentage in filtrate before and after the passivation of table 7 mud
By the analysis of data in his-and-hers watches 7, can find out that this method is to residual form (T5) successful improving Heavy Metals in Sludge.Before and after mud passivation in filtrate the amplification of residual form (T5) percentage as table 8:
The amplification of residual form (T5) percentage in filtrate before and after the passivation of table 8 mud
Embodiment five
Step one is 100:5 feeding by the mass ratio of the municipal sludge do not dewatered and chemical pure hydroxyapatite;
The municipal sludge that step 2 is not dewatered mixes with the proportioning of chemical pure hydroxyapatite by step one, is placed in water heating kettle, stirs 30min, generates the mixture of municipal sludge and the chemical pure hydroxyapatite do not dewatered;
The water heating kettle that step 2 uses is heated to after 140 DEG C by step 3, soaking time 12h, generates the municipal sludge that heavy metal is passivated.
The mud that reaction generates is gone out still, filters out filtrate and filtrate.
Adopt BCR improved method, analyze Heavy Metals and corresponding component concentration in the filtrate generated: the filtrate 0.5000g getting oven dry is in 50mL polypropylene centrifuge tube, and the extracting condition required according to BCR improved method and step carry out lixiviate.Sample arranges 3 Duplicate Samples (determination data is 3 mean values measured), and arranges blank.Before and after mud passivation in filtrate the comparison of residual form (T5) percentage as table 9:
The comparison of residual form (T5) percentage in filtrate before and after the passivation of table 9 mud
By the analysis of data in his-and-hers watches 9, can find out that this method is to residual form (T5) successful improving Heavy Metals in Sludge.Before and after mud passivation in filtrate the amplification of residual form (T5) percentage as table 10:
The amplification of residual form (T5) percentage in filtrate before and after the passivation of table 10 mud
In table 1, table 3, table 5, table 7, table 9, before mud passivation, in filtrate, the data of residual form (T5) percentage are obtained by following experiment:
Step one is got the municipal sludge 10g do not dewatered and is placed in hydrothermal reaction kettle;
The hydrothermal reaction kettle that step one uses by step 2 puts into baking oven, is heated to 110 DEG C, insulation 12h;
Mud after step 2 process is gone out still by step 3, filters out filtrate and filtrate;
Adopt BCR improved method, analyze Heavy Metals and corresponding component concentration in the filtrate generated: the filtrate 0.5000g getting oven dry is in 50mL polypropylene centrifuge tube, and the extracting condition required according to BCR improved method and step carry out lixiviate.Sample arranges 3 Duplicate Samples (determination data is 3 mean values measured), and arranges blank.Before mud passivation in filtrate heavy metal different shape content and percentage as table 11:
Heavy metal different shape content and percentage in filtrate before the passivation of table 11 mud
Note: the unit of element Hg, As, Cd content is ug/g, the mg/g of the unit of other constituent contents.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410707618.1A CN104529101A (en) | 2014-11-28 | 2014-11-28 | City sludge heavy metal passivation method by using hydroxyapatite as passivating agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410707618.1A CN104529101A (en) | 2014-11-28 | 2014-11-28 | City sludge heavy metal passivation method by using hydroxyapatite as passivating agent |
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| CN107487973A (en) * | 2017-10-10 | 2017-12-19 | 安吉晨源环保资源再生利用有限公司 | A kind of recyclable Urban sludge treatment system and its method |
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