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 PDF

Info

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
Application number
CN201410707618.1A
Other languages
Chinese (zh)
Inventor
任福民
梁远
黎艳
门正宇
郝慧明
刘锟
李素君
田秀君
Original Assignee
北京交通大学
北京城市排水集团有限责任公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 北京交通大学, 北京城市排水集团有限责任公司 filed Critical 北京交通大学
Priority to CN201410707618.1A priority Critical patent/CN104529101A/en
Publication of CN104529101A publication Critical patent/CN104529101A/en

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/20Heavy metals or heavy metal compounds

Abstract

The invention discloses a city sludge heavy metal passivation method by using hydroxyapatite as a passivating agent, relates to a city domestic sludge disposal method, and solves the problem that an ecological risk of heavy metals in a city domestic sludge agricultural utilization process is relatively high. The method comprises the following steps: step one, taking materials according to the mass ratio of city domestic sludge to chemically-pure hydroxyapatite of 100:1 to 100:5; step two, mixing the city domestic sludge with the chemically-pure hydroxyapatite according to the mass ratio of the step one, placing in a hydrothermal reaction kettle, stirring for 15-30 min, and producing a mixture of the city domestic sludge and the chemically-pure hydroxyapatite; and step three, heating the hydrothermal reaction kettle used in the step two to 110 DEG C-140 DEG C, carrying out heat preservation for 4-12 h, and generating city domestic sludge having the heavy metals passivated. The city domestic sludge of the step one is city domestic sludge without dehydration. The method can effectively reduce the ecological risk of the heavy metals in the city domestic sludge agricultural utilization process, and accelerates the resource utilization of the sludge.

Description

A kind of municipal sludge heavy metal passivating method adopting hydroxyapatite to do passivator

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

Element Hg As Cd Cr Pb Fe Amplification (%) 35.288 13.64 17.781 80.088 30.932 58.702

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

Element Hg As Cd Cr Pb Fe Amplification (%) 32.469 18.394 19.019 77.264 29.014 55.366

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

Element Hg As Cd Cr Pb Fe Amplification (%) 33.072 15.775 18.276 73.411 30.227 59.541

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

Element Hg As Cd Cr Pb Fe Amplification (%) 28.155 12.038 11.022 62.377 26.065 45.915

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

Element Hg As Cd Cr Pb Fe Amplification (%) 35.962 20.282 23.384 81.104 33.836 62.377

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)

1. adopt hydroxyapatite to do a municipal sludge heavy metal passivating method for passivator, it is characterized in that: 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.
2. employing hydroxyapatite according to claim 1 does the municipal sludge heavy metal passivating method of passivator, it is characterized in that:
Municipal sludge described in step one is the municipal sludge do not dewatered.
CN201410707618.1A 2014-11-28 2014-11-28 City sludge heavy metal passivation method by using hydroxyapatite as passivating agent CN104529101A (en)

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

Publications (1)

Publication Number Publication Date
CN104529101A true CN104529101A (en) 2015-04-22

Family

ID=52844795

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410707618.1A CN104529101A (en) 2014-11-28 2014-11-28 City sludge heavy metal passivation method by using hydroxyapatite as passivating agent

Country Status (1)

Country Link
CN (1) CN104529101A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10156394A (en) * 1996-12-03 1998-06-16 Nippon Conveyor Co Ltd Treatment of sludge
CN101412572A (en) * 2008-11-17 2009-04-22 南开大学 In-situ covering method for heavy metal in nano agustite immobilized sediment
CN103073166A (en) * 2013-02-05 2013-05-01 上海市环境科学研究院 Method for simultaneously stabilizing heavy metals and deeply dewatering municipal sludge for municipal sludge
CN103664126A (en) * 2012-09-20 2014-03-26 深圳市海川实业股份有限公司 Sludge curing treatment agent and method for treating sludge by use of curing treatment agent
CN103787558A (en) * 2012-11-01 2014-05-14 深圳市海川实业股份有限公司 Heavy metal stabilizer used for sludge treatment, and method for treating sludge by adopting it

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10156394A (en) * 1996-12-03 1998-06-16 Nippon Conveyor Co Ltd Treatment of sludge
CN101412572A (en) * 2008-11-17 2009-04-22 南开大学 In-situ covering method for heavy metal in nano agustite immobilized sediment
CN103664126A (en) * 2012-09-20 2014-03-26 深圳市海川实业股份有限公司 Sludge curing treatment agent and method for treating sludge by use of curing treatment agent
CN103787558A (en) * 2012-11-01 2014-05-14 深圳市海川实业股份有限公司 Heavy metal stabilizer used for sludge treatment, and method for treating sludge by adopting it
CN103073166A (en) * 2013-02-05 2013-05-01 上海市环境科学研究院 Method for simultaneously stabilizing heavy metals and deeply dewatering municipal sludge for municipal sludge

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
WANSHENG SHI等: "Study on interaction between phosphorus and cadmium in sewage sludge during hydrothermal treatment by adding hydroxyapatite", 《BIORESOURCE TECHNOLOGY》 *
丁松君等: "沉淀法净化含砷废水", 《江西冶金》 *
刘羽等: "磷灰石用于处理重金属废水的研究进展", 《矿物岩石地球化学通报》 *
黄鸽等: "不同稳定剂对污染沉积物中重金属的稳定效果", 《环境科学研究》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Similar Documents

Publication Publication Date Title
Sánchez et al. Compost supplementation with nutrients and microorganisms in composting process
Zhang et al. Sludge treatment: current research trends
Yang et al. Remediation of lead contaminated soil by biochar-supported nano-hydroxyapatite
Wei et al. Changes in phosphorus fractions during organic wastes composting from different sources
Wang et al. Insight into the effects of biochar on manure composting: evidence supporting the relationship between N2O emission and denitrifying community
Chintala et al. Effect of biochar on chemical properties of acidic soil
Malińska et al. Effects of biochar amendment on ammonia emission during composting of sewage sludge
Méndez et al. Effects of sewage sludge biochar on plant metal availability after application to a Mediterranean soil
Liu et al. Evolution of heavy metal speciation during the aerobic composting process of sewage sludge
Liu et al. Role and multi-scale characterization of bamboo biochar during poultry manure aerobic composting
Zhuang et al. The transformation pathways of nitrogen in sewage sludge during hydrothermal treatment
Chen et al. Influence of biochar on heavy metals and microbial community during composting of river sediment with agricultural wastes
Shi et al. Synergistic effect of rice husk addition on hydrothermal treatment of sewage sludge: fate and environmental risk of heavy metals
Jellali et al. Biosorption characteristics of ammonium from aqueous solutions onto Posidonia oceanica (L.) fibers
Ortner et al. Can bioavailability of trace nutrients be measured in anaerobic digestion?
Muhammad et al. Changes in microbial community structure due to biochars generated from different feedstocks and their relationships with soil chemical properties
Malińska et al. Biochar amendment for integrated composting and vermicomposting of sewage sludge–the effect of biochar on the activity of Eisenia fetida and the obtained vermicompost
Mosquera-Losada et al. Agronomic characterisation of different types of sewage sludge: policy implications
Bolan et al. Immobilization and phytoavailability of cadmium in variable charge soils. III. Effect of biosolid compost addition
Jiang et al. Effect of C/N ratio, aeration rate and moisture content on ammonia and greenhouse gas emission during the composting
Cai et al. Concentration and speciation of heavy metals in six different sewage sludge-composts
US10071404B2 (en) Refuse treatment method and apparatus for separating solid and liquid and separating organics and inorganics
Sprynskyy et al. Influence of clinoptilolite rock on chemical speciation of selected heavy metals in sewage sludge
Wang et al. Impact of fly ash and phosphatic rock on metal stabilization and bioavailability during sewage sludge vermicomposting
Wang et al. Comparison of biochar, zeolite and their mixture amendment for aiding organic matter transformation and nitrogen conservation during pig manure composting

Legal Events

Date Code Title Description
PB01 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20150422

RJ01 Rejection of invention patent application after publication