CN108439736A - A method of reducing Heavy Metal Level In Sludge and moisture percentage in sewage sludge - Google Patents

A method of reducing Heavy Metal Level In Sludge and moisture percentage in sewage sludge Download PDF

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Publication number
CN108439736A
CN108439736A CN201810268507.3A CN201810268507A CN108439736A CN 108439736 A CN108439736 A CN 108439736A CN 201810268507 A CN201810268507 A CN 201810268507A CN 108439736 A CN108439736 A CN 108439736A
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sludge
ardealite
heavy metal
moisture percentage
acetic acid
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马丽萍
戴取秀
任南琪
宁平
瞿广飞
郭致蓥
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Kunming University of Science and Technology
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Kunming University of Science and Technology
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    • 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
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/004Sludge detoxification
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/122Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • 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
    • 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
    • C02F2101/203Iron or iron compound
    • 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
    • C02F2101/206Manganese or manganese compounds
    • 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
    • C02F2101/22Chromium or chromium compounds, e.g. chromates
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/001Runoff or storm water
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/04Disinfection

Abstract

The invention discloses a kind of method of reduction Heavy Metal Level In Sludge and moisture percentage in sewage sludge, this method is to utilize modified ardealite and acetic acid Combined Treatment sludge, the method to reduce Heavy Metals in Sludge environmental risk and moisture percentage in sewage sludge;The addition of acetic acid and modified ardealite can significantly reduce the content of heavy metal in sludge filtrate, and the content of the larger Heavy Metals of sludge cake risk can also be obviously reduced so that the environmental risk of heavy metal reduces.Meanwhile the sludge handled through acetic acid and modified ardealite, dehydration rate increase substantially, and dewatered moisture percentage in sewage sludge is made to be down to 45% or less;The simple in production process operation of the present invention is easy, and production cost is low, makes full use of waste resource ardealite to carry out Treatment of Sludge, achievees the purpose that the treatment of wastes with processes of wastes against one another;While improving sludge heavy-metal environmental risk, the dewatering of sludge is improved;This technique has opened up the field of ardealite recycling, promotes the comprehensive utilization of ardealite, have a extensive future, market prospects it is good.

Description

A method of reducing Heavy Metal Level In Sludge and moisture percentage in sewage sludge
Technical field
The invention belongs to sludge reduction technical field of producing, while belonging to the recycling application field of ardealite, Relate to it is a kind of using modified ardealite and acetic acid co-conditioning, to reduce Heavy Metals in Sludge environmental risk and sludge The method of moisture content.
Background technology
Ardealite is the by-product for producing phosphoric acid by wet process, and discharge capacity is larger in chemical industry, often produces 1t phosphate fertilizer, average Generate 3.75 t ardealites.Currently, the mode that most domestic ardealite is all made of air storage is handled, a large amount of soils are being occupied While resource, there is larger impact to underground water and surrounding enviroment.It therefore, if can be by a series of physical chemical method by phosphorus Gypsum application will have practical significance the recycling of ardealite and improvement environment in related field.
Currently, the yield of municipal sludge is huge, moisture content is higher, and harmful components are also more.Danger of the municipal sludge to environment Evil, which is mainly manifested in sludge, contains multiple pollutant.If sludge is used for land use or building trade, a huge sum of money therein Belong to content and its high-moisture percentage of migration risk and sludge is undoubtedly the largest restraining factors, while the influence to environment is also most Big.Therefore, many scholars are had shown that by research, and Heavy Metal Level In Sludge and form can be acted on by biological or chemical To improvement.106430875 A of patent application patent CN, which are mentioned, to be compounded with activated carbon after chitosan carboxy methylation, then It is grafted thiocarbamide, a kind of stabilizer is prepared, is put into sludge, heavy metal Cr, Ni and Zn therein are stablized.Patent application Described in 106316094 A of patent CN, be added ferrous salt into sludge, calcium oxide, sodium hypochlorite, attapulgite, sepiolite and Apatite can be obtained heavy metal stabilization sludge after stirring evenly;And 105621835 A of patent application patent CN are proposed A kind of method of Heavy Metals in Sludge removal, with hydrochloric acid solution, ferrous sulfate and hydrogenperoxide steam generator are by the heavy metal in sludge It is extracted into liquid phase, reduces content of beary metal in solid phase.With Heavy Metals in Sludge removal and process for stabilizing it is continuous excellent To change, the processing mode of Heavy Metals in Sludge is varied, and treatment effect also gradually improves, but in general, all there is behaviour Make complicated, material consumption height, the bad disadvantage of high energy consumption, economy.Currently, sludge dewatering field using it is more be dewatering process It is to put into cationic polyacrylamide in sludge, by plate compression or centrifugal filtration, the moisture content of sludge is reduced, but Still containing 75%~85% moisture after sludge dewatering.Therefore experts and scholars pass through research, it is proposed that a series of sludge deeps The method of dehydration.104973751 A of patent application CN are mentioned using antibiotic dregs of a decoction ash as the additive of sludge dewatering, favorably In the dehydration of sludge.It is high by adding using plate compression type dehydration equipment described in 106542718 A of patent application CN Molecular flocculant and flocculation aid can significantly improve sludge dewatering efficiency.105461189 A of patent application CN provide one kind Combined type deep dehydration system for sludge and Deep dehydration technique, including sludge conditioning and press filteration system can improve the de- of sludge Water effect.With continuing to optimize for dewatering process, the dewatering type of sludge changes towards diversification, and dehydrating effect also steps up, But above-mentioned technique is made a general survey of, all have the shortcomings that complicated for operation, energy and material consumption is high.
Invention content
The purpose of the present invention is to provide a kind of method of reduction Heavy Metal Level In Sludge and moisture percentage in sewage sludge, this method It is to utilize modified ardealite and acetic acid Combined Treatment sludge, to reduce the side of Heavy Metals in Sludge environmental risk and moisture percentage in sewage sludge Method, this method is for reducing content of beary metal in sludge filtrate and improves Heavy Metals distribution in sludge cake, drops simultaneously Low moisture content of the cake, this method had both promoted the recycling of ardealite, can also greatly reduce Heavy Metals in Sludge Degree of risk, and moisture percentage in sewage sludge is greatly lowered, reach sewage sludge harmlessness, stabilisation and minimizing and ardealite recycling Purpose.
The method of the present invention carries out as follows:
(1)Acetic acid solution is added in the sludge after gravity concentration, stirs 5-20min, quiet heavy 10-30min at normal temperatures;Again Modified ardealite is added in sludge after Xiang Jingchen, after stirring 5-30min at normal temperatures, quiet heavy 10-30min;
(2)By the sludge pressure filtration after quiet sink, the lower sludge cake of moisture content and sludge filtrate are obtained, reduction mud cake is reached With content of beary metal in filtrate, and make the purpose of heavy metal stabilization.
The modified ardealite is that a concentration of 1-20mmol/L hexadecyltrimethylammonium chlorides are added in ardealite is molten Liquid, at normal temperatures oscillation impregnate 3-8h;After liquid after dipping consolidates suspension filtering, it is made after solid drying and grinding;Wherein phosphorus stone The mass volume ratio of cream and hexadecyltrimethylammonium chloride solution is 1g:20mL-50mL, dipping temperature are 20-30 DEG C.
Or modified ardealite is that a concentration of 1-5mmol/L ester based quaternary ammonium salts solution is added in ardealite, at normal temperatures Oscillation dipping 2-5h;After liquid after dipping consolidates suspension filtering, it is made after solid drying and grinding;Wherein ardealite and ester group quaternary ammonium The mass volume ratio of salting liquid is 1g:5mL-10mL, dipping temperature are 20-30 DEG C.
The acetic acid solution mass concentration is 50%-100%.
The ratio between the acetic acid solution volume mL and dry solids quality kg in sludge are 100:1-400:1, modified phosphorus stone Cream dosage is the 10%-50% of dry solids quality in sludge.
According to《Urban wastewater treatment firm pollutant emission standard (GB18918-2016)》Measure filtrate in heavy metal Cd, The content of Cr, Cu, Pb, Zn, Ni and As carry out content of beary metal in institute's measured value and untreated sludge filtrate to score Analysis.Meanwhile with reference to correlation technique, five heavy metal species forms in sludge cake are extracted and assay, in sludge cake Five heavy metal species forms are respectively exchangeable species, carbonate combine state, iron and manganese oxides reference state, organically combine state and residue State, and the heavy metal stabilizing of five kinds of forms grows from weak to strong successively.Therefore, a total huge sum of money is accounted for by measuring five kinds of form heavy metals The accounting for belonging to content, can analyze the situation of change of labile state heavy metal accounting, so as to know modified ardealite and second Effect of the sour Combined Treatment sludge for stiff stability content of beary metal in raising sludge cake.Meanwhile it is dirty with gravimetric detemination The moisture content of mud mud cake.
Ardealite is the by-product generated in phophatic fertilizer production process in the present invention, and main mineralogy compositional is calcium sulfate, Aluminium oxide and silica;The sludge referred in invention is generated after municipal sewage plant utilizes biological treatment treated sewage Mushy stage waste, have the characteristics that moisture content is high, simultaneously contain some pathogenic bacteria, the poisonous and harmful substances such as heavy metal.
Contain a large amount of mineralogy compositional in ardealite, for that in terms of Treatment of Sludge, can not only be provided for sludge effectively Framework construction body, additionally it is possible to by being modified to ardealite, it is electrical to change ardealite particle surface, can be in sludge It is played in terms of processing more multi-functional;And a key factor for influencing Heavy Metals in Sludge form and content is mud granule table The extracellular polymeric that face is wrapped in, on the one hand cracking for extracellular polymeric can release and be strapped in combination water therein, another Aspect can also discharge the heavy metal being present in mud granule surface or grain structure, can significantly change moisture in sludge flco Distribution and heavy metal distribution;And surface electrical behavior can be neutralized for positive conditioner by electrostatic, make stable colloid unstability in sludge, It releases and combines water and heavy metal, to achieve the purpose that improve dewatering performance of sludge and reduce heavy metal environmental risk;Therefore Ardealite is modified, it is electropositive modified ardealite finished product that surface electrical behavior, which is made, in terms of being applied to Treatment of Sludge, ability Significantly change the distribution situation of moisture content and heavy metal in sludge.Meanwhile acetic acid is because being capable of providing cation(Hydrogen ion), it is added It can promote cracking for extracellular polymeric in sludge, and electrostatic N-process can be promoted, sludge colloidal particle is made to be easier to lose Surely, water and heavy metal are combined in sludge stabilization colloidal dispersion to achieve the purpose that discharge;In addition the active group contained in acetic acid Also with the heavy metal in sludge system chelating and precipitation can occur for group, so that content of beary metal and form become Change, to reduce the Transport And Transformation risk of Heavy Metals in Sludge to a greater degree.
Advantages of the present invention and technique effect:
To utilizing modified ardealite and acetic acid Combined Treatment sludge, to reduce Heavy Metal Level In Sludge and moisture percentage in sewage sludge, Heavy Metals in Sludge stabilisation, innoxious and sludge reduction are also effectively promoted while promoting ardealite comprehensive utilization The development of technology, while compared with the existing methods, this method energy and material consumption is relatively low, Heavy Metals in Sludge environmental risk and mud Cake moisture content reduction degree is big, has operability;
By modified ardealite and acetic acid Combined Treatment sludge to reduce the side of Heavy Metal Level In Sludge and moisture percentage in sewage sludge The research of method, proposition first improve sludge with acetic acid, using the hydrogen ion contained in acetic acid, reduce the PH of sludge system, The elecrtonegativity extracellular polymeric wrapped up around mud granule is destroyed and is disintegrated, releases and is strapped in heavy metal therein and combination Water.Simultaneously with the disintegration of extracellular polymeric, the macromolecule organics such as protein and polysaccharide therein are gradual in acid condition It decomposes, dissociates the active group such as amino come, hydroxyl, carboxyl, phosphate, sulfate etc. can be by liquid phase and mud granule table The heavy metal in face is stablized by chelating precipitation or complexing in sediment.In general, such heavy metal complex or Heavy Metals belong to organically combine state in person's chelate, and stability is stronger, can be stable in the presence of in mud granule, to make Exchangeable species and carbonate combine state content of beary metal in liquid phase is obtained to be substantially reduced.Meanwhile the active group come is dissociateed in acetic acid The heavy metal of labile state can be also complexed in group's carboxyl, the heavy metal of organically combine state is made, to further reduced The content of exchangeable species and carbonate combine state heavy metal in liquid phase and solid phase.Meanwhile the combination water released enters freedom In water phase, it is easier to remove;
Modified ardealite is added into the sludge crossed through acetic acid treatment carries out subsequent processing;Due to modified ardealite particle table Face is attached to electrically for that just, the small flco of sludge can be adsorbed on modified ardealite particle surface by electrostatic neutralization Mud granule surface or the heavy metal that is present in mud granule structure are also with being attracted to modified ardealite particle surface;Together When due to modified ardealite particle surface have porous property mud granule can be firmly adsorbed under electrostatic neutralization In the gap of particle surface, compared with the conditioner of not cavernous structure, more mud granules can be accommodated on its surface, made The tiny mud granule that must be suspended in the liquid phase significantly reduces, with intergranular encapsulation, the heavy metal in liquid phase is tight Tight-binding is in flco, to reduce content of beary metal in liquid phase;In addition the rigid-skeleton of modified ardealite is sludge Grain provides the support of higher intensity, is more advantageous to the attachment of mud granule, more heavy metals can be taken away from liquid phase, and make It obtains mud particle to be not easy to be compressed during the dehydration process, so that moisture can enter liquid phase better by mud granule In;
Simultaneously as sludge colloidal dispersion is destroyed, effect of the unstable heavy metal in the part released in modified ardealite Under, it can be entered in the mineral structure of mud granule or modified ardealite particle by the package effect of carrying under one's arms, form residual form Heavy metal so that residual form content of beary metal increases, exchangeable species and carbonate combine state heavy metal accounting reduce.Add It, due to the porous surface suction-operated of modified ardealite so that in liquid phase and the labile state on mud granule surface a huge sum of money Category is attracted to particle surface or co-precipitation in oxide particle, forms Fe-Mn oxidation reference state heavy metal, can also reduce Exchangeable species and the content of carbonate combine state heavy metal in content of beary metal and solid phase in liquid phase;
Modified ardealite and acetic acid Combined Treatment sludge, can make full use of active group such as carboxyl and alkyl in acetic acid Sludge flco is connected by the effect of bridging bridge joint, forms the flco of bigger, and in the work of modified ardealite by long chained effect Under, the flco of bigger is formed, big flocculating body convergence is sunk, and on the one hand by sweeping along and suction-operated, heavy metal is tightly fettered Inside flco, to leave liquid phase, into solid phase, and relatively stable Heavy Metals are formed in solid phase;On the other hand, Big flocculating body flocculation sinking watching can effectively facilitate the separation of water and solid particle, to be easier moisture removal therein;
Technique carries out Combined Treatment with modified ardealite using acetic acid cheap and easy to get to sludge, can significantly improve in sludge The fractions distribution of heavy metal;In the sludge filtrate crossed through acetic acid and modified ardealite Combined Treatment content of beary metal with it is unprocessed The Heavy Metal Level In Sludge crossed is compared and is substantially reduced, and heavy in the sludge of the more unprocessed mistake of Heavy Metals accounting in mud cake Metal form accounting changes greatly, and environmental risk degree significantly reduces.The migration risk of Cr and As is respectively from low-risk to calm Danger, high risk are converted to medium risk, remaining element such as Cd, Cu and Zn devoid of risk, Pb, Ni are in low-risk area;Meanwhile the work Artistic skill significantly improves the suspended state of sludge so that sludge is easier to assemble to sink, and improves its dewatering, through acetic acid and changes The moisture percentage in sewage sludge that property ardealite Combined Treatment is crossed is down to 45% or less.With consuming greater energy consumption, the complicated method of process is compared, This method is simple and practicable, easy to operate, and energy consumption is relatively low, better economy;
Technique is after modified handled sludge using Industrial Solid Waste ardealite, embodies the environmental protection concept of the treatment of wastes with processes of wastes against one another, Promote being used interchangeably between waste;This method uses the preposition medicament that acetic acid is handled as modified ardealite, being capable of bigger journey Degree ground changes Heavy Metals in Sludge form, while acetic acid dosage is smaller, and is not likely to produce peril, has preferable practical Property.
The simple production process of the present invention, easy to operate, energy consumption is relatively low, and production cost is low, embodies the reason of the treatment of wastes with processes of wastes against one another It reads;Both promoted the recycling of ardealite, also for sludge stabilizing and it is innoxious provide technical support, saved a large amount of Resource has a extensive future.
Specific implementation mode
Below by embodiment, invention is further described in detail, but the scope of the present invention is not limited in described Hold.
Embodiment 1:The method of this reduction Heavy Metal Level In Sludge and moisture percentage in sewage sludge, concrete operations are as follows:
(1)Take 0.1g hexadecyltrimethylammonium chloride powder(Relative molecular mass is 320), it is dissolved in 62mL deionized waters, It is stirred under room temperature to being completely dissolved, is placed in spare in brown reagent bottle, wherein hexadecyltrimethylammonium chloride solution is dense Degree is 5mmol/L;
(2)The hexadecyltrimethylammonium chloride solution of a concentration of 5mmol/L of 200mL is added in 10g ardealites, at 20 DEG C Oscillation impregnates 3h, after the liquid after dipping consolidates suspension by filtering, is ground into powder after solid matter drying is cooling, as changes Property ardealite, is stored in spare in drier;
(3)It is 50% acetic acid solution to take mass concentration, is added in the sludge after gravity concentration, is stirred immediately under room temperature, Mixing speed is 250r/min, stirs 5min, stands reaction 10min, acetic acid solution volume mL and dry solids quality in sludge The ratio between kg is 100:1;
(4)Modified ardealite is added into the sludge after staticly settling, at normal temperatures, 250r/min be stirred 5min, stand 10min is precipitated, modified ardealite dosage is 10% of dry solids quality in sludge;
(5)Sludge is after staticly settling, pressure filtration, and filtered solid matter is sludge cake;By filtrate according to《City Town Wastewater Treatment discharge standard (GB18918-2016)》Measure filtrate in heavy metal Cd, Cr, Cu, Pb, Zn, Ni and The content of As be respectively 0mg/L, 0.034 mg/L, 0.008 mg/L, 0.063 mg/L, 0.57 mg/L, 0.0032 mg/L and 0.065 mg/L;Heavy metals of different forms in mud cake is extracted according to Heavy Metals extracting method, measures a wherein huge sum of money The content of category, and the accounting for calculating each form heavy metal is as shown in table 1 below;
The different Heavy Metals accountings (%) of table 1
From the foregoing, it will be observed that heavy metal Cd, the content of Cr, Cu, Pb, Zn, Ni and As are equal compared with the content in the filtrate of raw sewage in filtrate It is substantially reduced.Meanwhile the shape that the two kinds of Transport And Transformation risks of heavy metal Cd, Cr, Cu, Pb, Zn, Ni and As in mud cake are larger State:The content of exchangeable species and carbonate combine state is substantially reduced, and the accounting for accounting for total metal contents in soil in mud cake is also remarkably decreased, and The three kinds of forms relatively stablized in mud cake:The accounting of Fe-Mn oxidation reference state, organically combine state and residual form then obviously rises, especially It is that the accounting of organically combine state increases the most apparent.Meanwhile the sludge cake that modified ardealite is crossed with acetic acid Combined Treatment, The transport coefficient of heavy metal element therein is obviously reduced, and the migration risk of especially Cr and As is respectively from low-risk to calm Danger, high risk are converted to medium risk, remaining element such as Cd devoids of risk, and Cu, Pb and Zn are in low-risk area, and Ni is in medium Risk area.
In addition, filtered sludge cake is placed in porcelain crucible, the crucible for filling mud cake is put into baking oven, at 90 DEG C Dry 2h takes out crucible to constant weight, is put in drier cooling;Enter the quality before and after baking oven by measurement crucible, calculates The moisture content of mud cake is 40.6%.
Embodiment 2:The method of this reduction Heavy Metal Level In Sludge and moisture percentage in sewage sludge, concrete operations are as follows:
(1)0.1g hexadecyltrimethylammonium chloride powder is taken, is dissolved in 31mL deionized waters, is stirred under room temperature to completely molten Solution, is placed in spare in brown reagent bottle, the wherein a concentration of 10mmol/L of hexadecyltrimethylammonium chloride solution;
(2)A concentration of 10mmol/L hexadecyltrimethylammonium chlorides solution of 500mL is added in 10g ardealites, at 25 DEG C Oscillation dipping 5h;After liquid after dipping consolidates suspension by filtering, it is ground into powder after solid matter drying is cooling, as changes Property ardealite, is stored in spare in drier;
(3)It is 100% acetic acid solution to take mass concentration, is added in the sludge after gravity concentration, is stirred immediately at normal temperatures It mixes, mixing speed 500r/min, stirs 20min, stand reaction 30min, acetic acid solution volume mL and dry solids in sludge The ratio between quality kg is 200:1;
(4)Modified ardealite is added into the sludge after staticly settling, at normal temperatures, 500r/min be stirred 15min, stand 30min is precipitated, modified ardealite dosage is 50% of dry solids quality in sludge;
(5)Sludge is after staticly settling, and filtering, filtered solid matter is sludge cake;By filtrate according to《Cities and towns are dirty Water treatment plant's pollutant emission standard (GB18918-2016)》Measure heavy metal Cd, Cr, Cu, Pb, Zn, Ni and As in filtrate Content is respectively 0mg/L, 0.030 mg/L, 0.006 mg/L, 0.055 mg/L, 0.51 mg/L, 0.0030 mg/L and 0.062 mg/L;Heavy metals of different forms in mud cake is extracted according to Heavy Metals extracting method, measurement wherein heavy metal contains Amount, and the accounting for calculating each form heavy metal is as shown in table 2 below;
The different Heavy Metals accountings (%) of table 2
From the foregoing, it will be observed that heavy metal Cd, the content of Cr, Cu, Pb, Zn, Ni and As are equal compared with the content in the filtrate of raw sewage in filtrate It is substantially reduced.Meanwhile the shape that the two kinds of Transport And Transformation risks of heavy metal Cd, Cr, Cu, Pb, Zn, Ni and As in mud cake are larger State:The content of exchangeable species and carbonate combine state is substantially reduced, and the accounting for accounting for total metal contents in soil in mud cake is also remarkably decreased, and The three kinds of forms relatively stablized in mud cake:The accounting of Fe-Mn oxidation reference state, organically combine state and residual form then obviously rises, especially It is that the accounting of organically combine state increases the most apparent.Meanwhile the sludge cake that modified ardealite is crossed with acetic acid Combined Treatment, The transport coefficient of heavy metal element therein is obviously reduced, and the migration risk of especially Cr and As is respectively from low-risk to calm Danger, high risk are converted to low-risk, remaining element such as Cd and Cu devoids of risk, Pb and Zn are in low-risk area, and Ni is in medium wind Danger zone.
In addition, filtered sludge cake is placed in porcelain crucible, the crucible for filling mud cake is put into baking oven, at 90 DEG C Dry 2h takes out crucible to constant weight, is put in drier cooling;Enter the quality before and after baking oven by measurement crucible, calculates The moisture content of mud cake is 40.3%.
Embodiment 3:The method of this reduction Heavy Metal Level In Sludge and moisture percentage in sewage sludge, concrete operations are as follows:
(1)Ester based quaternary ammonium salt is taken, is dissolved in deionized water, is stirred under room temperature to being completely dissolved, is placed in standby in brown reagent bottle With the wherein a concentration of 1mmol/L of ester based quaternary ammonium salt solution;
(2)The ester based quaternary ammonium salt solution of a concentration of 1mmol/L is added in ardealite, the oscillation dipping 4h at 25 DEG C;After dipping Liquid consolidate suspension by filtering after, be ground into powder, as modified ardealite, be stored in dry after solid matter drying is cooling Spare in dry device, wherein the mass volume ratio of ardealite and ester based quaternary ammonium salt solution is 1g:6mL;
(3)It is 70% acetic acid solution to take mass concentration, is added in the sludge after gravity concentration, is stirred immediately at normal temperatures It mixes, mixing speed 500r/min, stirs 10min, stand reaction 20min, acetic acid solution volume mL and dry solids in sludge The ratio between quality kg is 300:1;
(4)Modified ardealite is added into the sludge after staticly settling, at normal temperatures, 500r/min be stirred 30min, stand 20min is precipitated, modified ardealite dosage is 30% of dry solids quality in sludge;
(5)Sludge is after staticly settling, and filtering, filtered solid matter is sludge cake;By filtrate according to《Cities and towns are dirty Water treatment plant's pollutant emission standard (GB18918-2016)》Measure heavy metal Cd, Cr, Cu, Pb, Zn, Ni and As in filtrate Content is respectively 0mg/L, 0.026 mg/L, 0.007 mg/L, 0.052 mg/L, 0.5 mg/L, 0.0026mg/L and 0.060 mg/L;Heavy metals of different forms in mud cake is extracted according to Heavy Metals extracting method, measurement wherein heavy metal contains Amount, and the accounting for calculating each form heavy metal is as shown in table 3 below;
The different Heavy Metals accountings (%) of table 3
From the foregoing, it will be observed that heavy metal Cd, the content of Cr, Cu, Pb, Zn, Ni and As are equal compared with the content in the filtrate of raw sewage in filtrate It is substantially reduced.Meanwhile the shape that the two kinds of Transport And Transformation risks of heavy metal Cd, Cr, Cu, Pb, Zn, Ni and As in mud cake are larger State:The content of exchangeable species and carbonate combine state is substantially reduced, and the accounting for accounting for total metal contents in soil in mud cake is also remarkably decreased, and The three kinds of forms relatively stablized in mud cake:The accounting of Fe-Mn oxidation reference state, organically combine state and residual form then obviously rises, especially It is that the accounting of organically combine state increases the most apparent.Meanwhile the sludge cake that modified ardealite is crossed with acetic acid Combined Treatment, The transport coefficient of heavy metal element therein is obviously reduced, and the migration risk of especially Cr and As is respectively from low-risk to calm Danger, high risk are converted to medium risk, remaining element such as Cd devoids of risk, Cu, Pb and Zn are in low-risk area, and Ni is in medium wind Danger zone.
In addition, filtered sludge cake is placed in porcelain crucible, the crucible for filling mud cake is put into baking oven, at 90 DEG C Dry 2h takes out crucible to constant weight, is put in drier cooling;Enter the quality before and after baking oven by measurement crucible, calculates The moisture content of mud cake is 40.2%.
Embodiment 4:The method of this reduction Heavy Metal Level In Sludge and moisture percentage in sewage sludge, concrete operations are as follows:
(1)Ester based quaternary ammonium salt is taken, is dissolved in deionized water, is stirred under room temperature to being completely dissolved, is placed in standby in brown reagent bottle With the wherein a concentration of 3mmol/L of ester based quaternary ammonium salt solution;
(2)The ester based quaternary ammonium salt solution of a concentration of 3mmol/L is added in ardealite, the oscillation dipping 2h at 28 DEG C;After dipping Liquid consolidate suspension by filtering after, be ground into powder, as modified ardealite, be stored in dry after solid matter drying is cooling Spare in dry device, wherein the mass volume ratio of ardealite and ester based quaternary ammonium salt solution is 1g:9mL;
(3)It is 50% acetic acid solution to take mass concentration, is added in the sludge after gravity concentration, is stirred immediately at normal temperatures It mixes, mixing speed 500r/min, stirs 20min, stand reaction 10min, acetic acid solution volume mL and dry solids in sludge The ratio between quality kg is 150:1;
(4)Modified ardealite is added into the sludge after staticly settling, at normal temperatures, 500r/min be stirred 10min, stand 30min is precipitated, modified ardealite dosage is 40% of dry solids quality in sludge;
(5)Sludge is after staticly settling, and filtering, filtered solid matter is sludge cake;By filtrate according to《Cities and towns are dirty Water treatment plant's pollutant emission standard (GB18918-2016)》Measure heavy metal Cd, Cr, Cu, Pb, Zn, Ni and As in filtrate Content is respectively 0mg/L, 0.022 mg/L, 0.005 mg/L, 0.050 mg/L, 0.46 mg/L, 0.0025 mg/L and 0.053 mg/L;Heavy metals of different forms in mud cake is extracted according to Heavy Metals extracting method, measurement wherein heavy metal contains Amount, and the accounting for calculating each form heavy metal is as shown in table 4 below;
The different Heavy Metals accountings (%) of table 4
From the foregoing, it will be observed that heavy metal Cd, the content of Cr, Cu, Pb, Zn, Ni and As are equal compared with the content in the filtrate of raw sewage in filtrate It is substantially reduced.Meanwhile the shape that the two kinds of Transport And Transformation risks of heavy metal Cd, Cr, Cu, Pb, Zn, Ni and As in mud cake are larger State:The content of exchangeable species and carbonate combine state is substantially reduced, and the accounting for accounting for total metal contents in soil in mud cake is also remarkably decreased, and The three kinds of forms relatively stablized in mud cake:The accounting of Fe-Mn oxidation reference state, organically combine state and residual form then obviously rises, especially It is that the accounting of organically combine state increases the most apparent.Meanwhile the sludge cake that modified ardealite is crossed with acetic acid Combined Treatment, The transport coefficient of heavy metal element therein is obviously reduced, and the migration risk of especially Cr and As is respectively from low-risk to calm Danger, high risk are converted to medium risk, remaining element such as Cd, Cu and Zn devoid of risk, Pb, Ni are in low-risk area.
In addition, filtered sludge cake is placed in porcelain crucible, the crucible for filling mud cake is put into baking oven, at 90 DEG C Dry 2h takes out crucible to constant weight, is put in drier cooling;Enter the quality before and after baking oven by measurement crucible, calculates The moisture content of mud cake is 40%.

Claims (5)

1. a kind of method reducing Heavy Metal Level In Sludge and moisture percentage in sewage sludge, which is characterized in that carry out as follows:
(1)Acetic acid solution is added in the sludge after gravity concentration, stirs 5-20min, quiet heavy 10-30min at normal temperatures;Again Modified ardealite is added in sludge after Xiang Jingchen, after stirring 5-30min at normal temperatures, quiet heavy 10-30min;
(2)By the sludge pressure filtration after quiet sink, the lower sludge cake of moisture content and sludge filtrate are obtained, reduction mud cake is reached With content of beary metal in filtrate, and make the purpose of heavy metal stabilization.
2. the method according to claim 1 for reducing Heavy Metal Level In Sludge and moisture percentage in sewage sludge, it is characterised in that:Change Property ardealite is that a concentration of 1-20mmol/L hexadecyltrimethylammonium chlorides solution is added in ardealite, is vibrated at normal temperatures Impregnate 3-8h;After liquid after dipping consolidates suspension filtering, it will be made after solid drying and grinding;Wherein ardealite and cetyl three The mass volume ratio of methyl chloride ammonium salt solution is 1g:20mL-50mL, dipping temperature are 20-30 DEG C.
3. the method according to claim 1 for reducing Heavy Metal Level In Sludge and moisture percentage in sewage sludge, it is characterised in that:Change Property ardealite be that a concentration of 1-5mmol/L ester based quaternary ammonium salts solution is added in ardealite, at normal temperatures oscillation dipping 2-5h;Leaching After liquid after stain consolidates suspension filtering, it will be made after solid drying and grinding;The wherein quality of ardealite and ester based quaternary ammonium salt solution Volume ratio is 1g:5mL-10mL, dipping temperature are 20-30 DEG C.
4. the method according to claim 1 for reducing Heavy Metal Level In Sludge and moisture percentage in sewage sludge, it is characterised in that:Second Acid solution mass concentration is 50%-100%.
5. the method according to claim 4 for reducing Heavy Metal Level In Sludge and moisture percentage in sewage sludge, it is characterised in that:Second The ratio between acid solution volume mL and dry solids quality kg in sludge are 100:1-400:1, modified ardealite dosage is sludge The 10%-50% of middle dry solids quality.
CN201810268507.3A 2018-03-29 2018-03-29 A method of reducing Heavy Metal Level In Sludge and moisture percentage in sewage sludge Pending CN108439736A (en)

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CN110981131A (en) * 2019-12-24 2020-04-10 江西省科学院 Kit for treating livestock and poultry waste and method for treating heavy metal in livestock and poultry waste based on kit

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