CN108636353B - domestic sewage sludge/rectorite compound and preparation method and application thereof - Google Patents

domestic sewage sludge/rectorite compound and preparation method and application thereof Download PDF

Info

Publication number
CN108636353B
CN108636353B CN201810529425.XA CN201810529425A CN108636353B CN 108636353 B CN108636353 B CN 108636353B CN 201810529425 A CN201810529425 A CN 201810529425A CN 108636353 B CN108636353 B CN 108636353B
Authority
CN
China
Prior art keywords
rectorite
sludge
domestic sewage
drying
sewage sludge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201810529425.XA
Other languages
Chinese (zh)
Other versions
CN108636353A (en
Inventor
周培疆
张隽晔
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan University WHU
Original Assignee
Wuhan University WHU
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 Wuhan University WHU filed Critical Wuhan University WHU
Priority to CN201810529425.XA priority Critical patent/CN108636353B/en
Publication of CN108636353A publication Critical patent/CN108636353A/en
Application granted granted Critical
Publication of CN108636353B publication Critical patent/CN108636353B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
    • B01J20/12—Naturally occurring clays or bleaching earth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/3078—Thermal treatment, e.g. calcining or pyrolizing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2220/00—Aspects relating to sorbent materials
    • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
    • B01J2220/48—Sorbents characterised by the starting material used for their preparation
    • B01J2220/4875—Sorbents characterised by the starting material used for their preparation the starting material being a waste, residue or of undefined composition
    • B01J2220/4887—Residues, wastes, e.g. garbage, municipal or industrial sludges, compost, animal manure; fly-ashes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Soil Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Treatment Of Sludge (AREA)

Abstract

The invention discloses a preparation method of a domestic sewage sludge/rectorite compound, which comprises the following steps: (1) firstly, centrifugally dewatering domestic sewage sludge, drying the dewatered sludge to constant weight, and then removing impurities, crushing and sieving for later use; (2) cleaning rectorite, and then drying for later use; (3) putting the rectorite obtained in the step (2) into a beaker filled with deionized water, performing ultrasonic dispersion, adding a certain amount of the sludge obtained in the step (1), and then stirring, filtering and drying; (4) and (4) placing the dried compound in the step (3) into a tubular furnace for calcining, and cooling to room temperature after calcining to obtain the domestic sewage sludge/rectorite compound. The invention utilizes the excess sludge which is difficult to dispose by the sewage treatment plant and the rectorite which is cheap and easy to obtain to prepare the raw sludge/clay compound, has wide sources, low cost and simple preparation method, can adsorb heavy metal and organic matters in the water body, and can be applied to soil improvement and restoration.

Description

Domestic sewage sludge/rectorite compound and preparation method and application thereof
Technical Field
The invention belongs to the technical field of treatment and disposal of sludge waste and synthesis of natural clay mineral composite materials, and particularly relates to a domestic sewage sludge/rectorite composite and a preparation method and application thereof.
background
In recent years, clay minerals have been widely used in the fields of industry, agriculture and the like, and due to some unique physicochemical characteristics of clay, including small particle size, lamellar structure, large specific surface area and strong ion exchange capacity, the clay minerals have a strong pollutant fixing function, so the clay minerals can be used as low-cost adsorbents and soil conditioners and remediation agents. The natural rectorite is composed of a dioctahedral mica layer and an expandable dioctahedral montmorillonite layer, and the ratio of the natural rectorite to the expandable dioctahedral mica layer is 1: 1. The montmorillonite layers of the rectorite contain exchangeable hydrated cations, so the rectorite can be used as a catalyst for removing heavy metal ions (such as Pb) in water2+、Cd2+Etc.) can adsorb organic pollutants at the same time, and can be applied to soil improvement and remediation.
The water content of the domestic sewage sludge is generally over 70 percent, the contents of organic matters and nitrogen and phosphorus are high, and a large amount of harmful substances such as pathogenic microorganisms, parasitic ova and the like are enriched. The harmless and recycling of sludge has become an important research direction in the field of sludge treatment. The high-temperature pyrolysis of the sludge can reduce the migration and transformation of toxic and harmful substances, and the sludge biochar is widely used for repairing heavy metal and organic polluted water bodies due to the large specific surface area, high porosity and rich functional groups on the surface, so that when the sludge biochar is used for improving soil, the soil fertility can be improved, the soil nutrient and water retention capacity can be increased, the agricultural productivity can be improved, and simultaneously, the carbon can be fixed, the carbon dioxide emission can be reduced, and the greenhouse effect can be relieved.
The surface modification of clay is to improve the surface activity of the clay by changing the composition, structure, functional group, wettability, reaction characteristic and the like of the surface of the clay. Common clay modification methods include thermal modification, acid-base modification, surfactant modification, modification by adding cationic polymers (pillaring agents), and the like. The modification of the surfactant can introduce functional groups on the surface of the clay, thereby increasing the adsorption performance of the clay to heavy metals and organic pollutants. However, no relevant research is available for directly using domestic sewage sludge for modifying clay minerals. Therefore, the domestic sewage sludge is used as an organic modifier of rectorite, the domestic sewage sludge/rectorite compound is prepared by mixing the domestic sewage sludge and the rectorite and pyrolyzing the mixture in a tubular furnace by a one-step pyrolysis method, and the compound has a large specific surface area and a rich organic functional group on the surface, can be used for adsorbing heavy metals and organic pollutants in a water body and can be applied to soil improvement and remediation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation method and application of a domestic sewage sludge/rectorite compound. The method provided by the invention is low in cost and simple, can recycle domestic sludge, has great advantages, and the prepared multifunctional composite material is excellent in property, can adsorb heavy metals and organic pollutants in a water body, and can be further applied to soil improvement and remediation.
In order to solve the problems, the invention adopts the technical scheme that:
A preparation method of a domestic sewage sludge/rectorite compound comprises the following steps:
(1) firstly, centrifugally dewatering domestic sewage sludge, drying the dewatered sludge to constant weight, and then removing impurities, crushing and sieving for later use;
(2) Cleaning rectorite, and then drying for later use;
(3) Putting the rectorite obtained in the step (2) into a beaker filled with deionized water, performing ultrasonic dispersion, adding a certain amount of the sludge obtained in the step (1), and then stirring, filtering and drying;
(4) and (4) placing the dried compound in the step (3) into a tubular furnace for calcining, and cooling to room temperature after calcining to obtain the domestic sewage sludge/rectorite compound.
Preferably, the rotation speed in the centrifugation in the step (1) is 3000r/min-10000r/min, the drying temperature is 60-105 ℃, and the mixture is sieved by a 40-100 mesh sieve.
Preferably, the washing in the step (2) is carried out by respectively washing with ultrapure water and absolute ethyl alcohol for 3-5 times, and the drying temperature is 60-105 ℃.
Preferably, the dosage of the rectorite in the step (3) is 0.1g-3.0g, and the ratio of the addition amount of the sludge to the dosage of the rectorite is 1: 0.2-5.0; the stirring time is 1h-4h, and the drying temperature is 60-105 ℃.
Preferably, the calcination process in step (4) is as follows: firstly 50 mL/min-1-100mL·min-1introducing inert gas or nitrogen at the flow rate of (1) for 15-45 min, and then at 5 deg.C/min-1The temperature is raised to 300-700 ℃ at the rate, and the calcination is carried out for 1-4 h at the temperature.
In addition, the invention also claims the domestic sewage sludge/rectorite compound prepared by the preparation method and the application of the domestic sewage sludge/rectorite compound in adsorbing heavy metals or organic pollutants in water and improving and repairing soil.
Compared with the prior art, the invention has the following obvious beneficial effects:
(1) The multifunctional compound prepared by the invention takes rectorite and domestic sewage sludge as raw materials, wherein the rectorite belongs to natural clay mineral, the cost is low, and the domestic sewage sludge is waste, can be used for preparing an adsorbent and a novel soil conditioner, and is an environment-friendly material;
(2) The preparation method is simple, and the one-step pyrolysis method is adopted after ultrasonic stirring and dispersion, so that the preparation method is easy to realize;
(3) according to the invention, clay mineral rectorite is well dispersed in a water phase to form an inorganic colloid and has quite large surface charges capable of performing surface adsorption and ion exchange, so that heavy metals, organic matters and the like can be adsorbed, the migration of the inorganic colloid in water and the adsorption capacity of pollutants can be increased by doping organic matters, domestic sludge is an organic floccule, and after the clay colloid is mixed with the domestic sludge, organic components of the clay colloid are combined on the surface of the inorganic colloid, so that the adsorption effect of the clay colloid on the heavy metal organic matters in the water body and the soil remediation effect are improved;
(4) The composite obtained by the invention has large specific surface area, good pore structure and rich organic functional groups on the surface, has adsorption performance superior to that of sludge biochar and rectorite, can be used for adsorbing various heavy metals and organic matters simultaneously, can be used as a soil conditioner for fixing heavy metals and organic pollutants in soil and improving nutrients in the soil, and is a novel multifunctional composite material.
Drawings
FIG. 1 is a scanning electron micrograph of sludge biochar (a), rectorite (b) and a domestic sewage sludge/rectorite composite (c, d) prepared in example 1;
FIG. 2 is a Fourier infrared spectrum of sludge biochar, rectorite and a domestic sewage sludge/rectorite composite prepared in example 1;
FIG. 3 is an X-ray diffraction pattern of sludge biochar, rectorite and the domestic sewage sludge/rectorite composite prepared in example 1.
Detailed Description
the invention is further illustrated by the following specific examples. The following examples are intended to illustrate the invention only and are not intended to limit the scope of the invention.
Example 1
A preparation method of a domestic sewage sludge/rectorite compound comprises the following steps:
(1) Firstly, centrifugally dewatering domestic sewage sludge at the rotating speed of 5000r/min, drying the dewatered sludge in a drying oven at the temperature of 60 ℃ to constant weight, then removing impurities, crushing and sieving by a 60-mesh sieve for later use;
(2) Washing rectorite with deionized water and ethanol for 4 times, and drying in an oven at 60 deg.C;
(3) Putting 1.5g of the rectorite obtained in the step (2) into a beaker filled with 50mL of deionized water, ultrasonically dispersing for 30min, then adding 0.5g of the sludge obtained in the step (1), stirring for 2h at 25 ℃, filtering, and drying at 60 ℃;
(4) Putting the sludge dried in the step (3) into a tubular furnace, and putting the sludge into the tubular furnace at a speed of 70 mL/min-1Nitrogen was introduced at a flow rate of 30min, followed by 5 ℃ min-1Heating to 400 ℃, calcining for 2 hours at the temperature, cooling to room temperature after the calcining is finished, and grinding the product and sieving by a 200-mesh sieve to obtain the domestic sewage sludge/rectorite compound.
FIG. 1 is a scanning electron micrograph of sludge biochar (a), rectorite (b) and a domestic sewage sludge/rectorite composite (c, d) prepared in example 1.
as is apparent from FIG. 1, the rectorite has a layered structure, and the surface of the sludge biochar is rough and porous. In the domestic sewage sludge/rectorite composite, the sludge is obviously present in the composite material in the form of biochar after pyrolysis, the rectorite is well dispersed on the surface of the biochar, and the composite is different from the rectorite and the sludge biochar and is a novel composite material.
FIG. 2 is a Fourier infrared spectrum of sludge biochar, rectorite and the domestic sewage sludge/rectorite composite prepared in example 1.
As shown in figure 2, in the infrared spectrum of the domestic sewage sludge/rectorite composite, a peak of 1037cm of organic functional groups in the sludge biochar is simultaneously seen-1Peak 921cm of mineral in (C-OH and-CH groups) and rectorite-1(Al-O-(OH)-Al)，821cm-1，700cm-1，546cm-1and 476cm-1(Si-O-Si)。
FIG. 3 is an X-ray diffraction pattern of sludge biochar, rectorite and the domestic sewage sludge/rectorite composite prepared in example 1.
as shown in fig. 3, a diffraction peak of rectorite at 2 θ of 7.2 ° is a characteristic peak of rectorite. For sludge biochar, quartz (with a characteristic peak at 26.6 ° 2 θ) is the most recognizable crystal structure in its X-ray diffraction pattern. In the composite material, the characteristic peak of rectorite shifts to a high angle, and a diffraction peak of quartz is also observed, but is lower than that of quartz in the sludge biochar.
The domestic sewage sludge/rectorite composite prepared in the example is used for treating the sewage containing Pb2+the adsorption experiment was carried out on the solution (initial concentration 50mg/L, pH5, shaking table in a constant temperature water bath at 20 ℃ C.). The experimental result shows that the compound is used for treating Pb2+The adsorption capacity of (A) was 25.95 mg/g. At the same time, the material is used for Cd2+The adsorption test (initial concentration 20mg/L, pH5, shaking table in constant temperature water bath at 20 ℃) was carried out, and the adsorption amount was 3.1 mg/g.
example 2
A preparation method of a domestic sewage sludge/rectorite compound comprises the following steps:
(1) firstly, centrifugally dewatering domestic sewage sludge at the rotating speed of 5000r/min, drying the dewatered sludge in a drying oven at the temperature of 60 ℃ to constant weight, then removing impurities, crushing and sieving by a 60-mesh sieve for later use;
(2) Washing rectorite with deionized water and ethanol for 4 times, and drying in an oven at 60 deg.C;
(3) putting 1.5g of the rectorite obtained in the step (2) into a beaker filled with 50mL of deionized water, ultrasonically dispersing for 30min, then adding 1.5g of the sludge obtained in the step (1), stirring for 2h at 25 ℃, filtering, and drying at 60 ℃;
(4) putting the sludge dried in the step (3) into a tubular furnace at a speed of 60 mL/min-1nitrogen was introduced at a flow rate of 30min, followed by 5 ℃ min-1The temperature is increased to 400 ℃, and the mixture is calcined for 2 hours at the temperature, and cooled after the calcination is finishedand (3) cooling to room temperature, and then grinding the product and sieving the product with a 200-mesh sieve to obtain the domestic sewage sludge/rectorite compound.
The domestic sewage sludge/rectorite compound prepared in the embodiment is used for treating Pb2+The solution (initial concentration 50mg/L, pH5, 20 ℃ constant temperature water bath shaker) was subjected to adsorption experiments. The experimental result shows that the compound is used for treating Pb2+The amount of adsorbed was 23.59 mg/g.
example 3
A preparation method of a domestic sewage sludge/rectorite compound comprises the following steps:
(1) firstly, centrifugally dewatering domestic sewage sludge at the rotating speed of 5000r/min, drying the dewatered sludge in a drying oven at the temperature of 60 ℃ to constant weight, then removing impurities, crushing and sieving by a 60-mesh sieve for later use;
(2) Washing rectorite with deionized water and ethanol for 4 times, and drying in an oven at 60 deg.C;
(3) Putting 2.5g of the rectorite obtained in the step (2) into a beaker filled with 50mL of deionized water, ultrasonically dispersing for 30min, then adding 0.5g of the sludge obtained in the step (1), stirring for 2h at 25 ℃, filtering, and drying at 60 ℃;
(4) putting the sludge dried in the step (3) into a tubular furnace, and putting the sludge into the tubular furnace at a speed of 70 mL/min-1Nitrogen was introduced at a flow rate of 30min, followed by 5 ℃ min-1Heating to 400 ℃, calcining for 2 hours at the temperature, cooling to room temperature after the calcining is finished, and grinding the product and sieving by a 200-mesh sieve to obtain the domestic sewage sludge/rectorite compound.
the domestic sewage sludge/rectorite compound prepared in the embodiment is used for treating Pb2+The solution (initial concentration 50mg/L, pH5, 20 ℃ constant temperature water bath shaker) was subjected to adsorption experiments. The experimental result shows that the compound is used for treating Pb2+The amount of adsorbed was 24.53 mg/g.
Example 4
A preparation method of a domestic sewage sludge/rectorite compound comprises the following steps:
(1) Firstly, centrifugally dewatering domestic sewage sludge at the rotating speed of 5000r/min, drying the dewatered sludge in a drying oven at the temperature of 60 ℃ to constant weight, then removing impurities, crushing and sieving by a 60-mesh sieve for later use;
(2) washing rectorite with deionized water and ethanol for 4 times, and drying in an oven at 60 deg.C;
(3) Putting 0.5g of the rectorite obtained in the step (2) into a beaker filled with 50mL of deionized water, performing ultrasonic dispersion for 30min, then adding 1.5g of the sludge obtained in the step (1), stirring for 2h at 25 ℃, performing suction filtration, and drying at 60 ℃;
(4) Putting the sludge dried in the step (3) into a tubular furnace, and putting the sludge into the tubular furnace at a speed of 70 mL/min-1Nitrogen was introduced at a flow rate of 30min, followed by 5 ℃ min-1Heating to 400 ℃, calcining for 2 hours at the temperature, cooling to room temperature after the calcining is finished, and grinding the product and sieving by a 200-mesh sieve to obtain the domestic sewage sludge/rectorite compound.
the domestic sewage sludge/rectorite compound prepared in the embodiment is used for treating Pb2+the solution (initial concentration 50mg/L, pH5, 20 ℃ constant temperature water bath shaker) was subjected to adsorption experiments. The experimental result shows that the compound is used for treating Pb2+The amount of adsorbed was 23.28 mg/g.
example 5
a preparation method of a domestic sewage sludge/rectorite compound comprises the following steps:
(1) Firstly, centrifugally dewatering domestic sewage sludge at the rotating speed of 5000r/min, drying the dewatered sludge in a drying oven at the temperature of 60 ℃ to constant weight, then removing impurities, crushing and sieving by a 60-mesh sieve for later use;
(2) Washing rectorite with deionized water and ethanol for 5 times, and drying in an oven at 60 deg.C;
(3) putting 0.5g of the rectorite obtained in the step (2) into a beaker filled with 50mL of deionized water, performing ultrasonic dispersion for 30min, then adding 2.5g of the sludge obtained in the step (1), stirring for 2h at 25 ℃, performing suction filtration, and drying at 60 ℃;
(4) putting the sludge dried in the step (3) into a tubular furnace at a speed of 60 mL/min-1Nitrogen was introduced at a flow rate of 30min, followed by 5 ℃ min-1The temperature is increased to 400 ℃, the mixture is calcined at the temperature for 2 hours, the mixture is cooled to the room temperature after the calcination is finished, and then the product is groundGrinding and sieving by a 200-mesh sieve to obtain the domestic sewage sludge/rectorite compound.
the adsorption experiment of the domestic sewage sludge/rectorite composite prepared in the example on a bisphenol A solution (initial concentration 10mg/L, pH5, constant temperature water bath shaking table at 20 ℃) was carried out. The experimental result shows that the adsorption quantity of the compound to the bisphenol A is 1.8 mg/g.
Comparative example 1
a preparation method of a domestic sewage sludge material comprises the following specific steps: firstly, domestic sewage sludge is centrifugally dewatered at the rotating speed of 5000r/min, the dewatered sludge is placed in a drying oven for drying at the temperature of 60 ℃ until the weight is constant, and then impurity removal, crushing and 60-mesh sieving are carried out.
The domestic sewage sludge material prepared by the comparative example contains Pb2+The adsorption experiment was carried out on the solution (initial concentration 50mg/L, pH5, shaking table in a constant temperature water bath at 20 ℃ C.). The experimental result shows that the material is used for treating Pb2+The adsorption capacity of (A) was 15.52 mg/g.
Comparative example 2
A preparation method of a rectorite adsorbing material comprises the following specific steps: washing rectorite with deionized water and ethanol for 4 times, and oven drying at 60 deg.C.
The rectorite adsorbing material prepared by the comparative example is used for adsorbing Pb containing2+The adsorption experiment was carried out on the solution (initial concentration 50mg/L, pH5, shaking table in a constant temperature water bath at 20 ℃ C.). The experimental result shows that the material is used for treating Pb2+the adsorption capacity of (A) was 17.34 mg/g.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.

Claims (5)

1. The application of the domestic sewage sludge/rectorite compound in adsorbing heavy metal or organic pollutants in a water body and improving and restoring soil is characterized in that the preparation method of the domestic sewage sludge/rectorite compound comprises the following steps:
(1) Firstly, centrifugally dewatering domestic sewage sludge, drying the dewatered sludge to constant weight, and then removing impurities, crushing and sieving for later use;
(2) Cleaning rectorite, and then drying for later use;
(3) putting the rectorite obtained in the step (2) into a beaker filled with deionized water, performing ultrasonic dispersion, adding a certain amount of the sludge obtained in the step (1), and then stirring, filtering and drying;
(4) And (4) placing the dried compound in the step (3) into a tubular furnace for calcining, and cooling to room temperature after calcining to obtain the domestic sewage sludge/rectorite compound.
2. The use of claim 1, wherein the rotation speed during centrifugation in step (1) is 3000r/min-10000r/min, the drying temperature is 60 ℃ -105 ℃, and the product is sieved by a 40-100 mesh sieve.
3. The use according to any one of claims 1-2, wherein the washing in step (2) is carried out 3-5 times by using ultrapure water and absolute ethyl alcohol respectively, and the drying temperature is 60-105 ℃.
4. The use according to claim 3, wherein the amount of rectorite used in step (3) is 0.1g to 3.0g, and the ratio of the amount of sludge added to the amount of rectorite used is 1: 0.2-5.0; the stirring time is 1h-4h, and the drying temperature is 60-105 ℃.
5. the use of claim 3, wherein the calcination process in step (4) is: firstly 50 mL/min-1-100mL·min-1Introducing inert gas or nitrogen at the flow rate of (1) for 15-45 min, and then at 5 deg.C/min-1the temperature is raised to 300-700 ℃ at the rate, and the calcination is carried out for 1-4 h at the temperature.
CN201810529425.XA 2018-05-29 2018-05-29 domestic sewage sludge/rectorite compound and preparation method and application thereof Active CN108636353B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810529425.XA CN108636353B (en) 2018-05-29 2018-05-29 domestic sewage sludge/rectorite compound and preparation method and application thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810529425.XA CN108636353B (en) 2018-05-29 2018-05-29 domestic sewage sludge/rectorite compound and preparation method and application thereof

Publications (2)

Publication Number Publication Date
CN108636353A CN108636353A (en) 2018-10-12
CN108636353B true CN108636353B (en) 2019-12-13

Family

ID=63758425

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810529425.XA Active CN108636353B (en) 2018-05-29 2018-05-29 domestic sewage sludge/rectorite compound and preparation method and application thereof

Country Status (1)

Country Link
CN (1) CN108636353B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109621907A (en) * 2018-12-24 2019-04-16 北京建筑大学 A kind of mud granule and the preparation method and application thereof for removing removing heavy metals

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51148971A (en) * 1975-06-17 1976-12-21 Unitika Ltd Surfactant containing waste water treatment
CN101362073B (en) * 2008-09-27 2010-10-13 山东大学 Preparation method of acidification sludge bentonite granules
CN103127905A (en) * 2011-12-01 2013-06-05 孟宪清 Preparative technique for bentonite particles
CN104624153A (en) * 2014-12-09 2015-05-20 邹仕放 Method for preparingadsorbing material by utilizing sludge
CN105126749A (en) * 2015-07-10 2015-12-09 扬州大学 Domestic sludge-based charcoal preparation method, and application of charcoal

Also Published As

Publication number Publication date
CN108636353A (en) 2018-10-12

Similar Documents

Publication Publication Date Title
CN107639106B (en) Low-grade attapulgite crude ore heavy metal solidified material and method for in-situ remediation of polluted soil by using same
CN110756166A (en) Corncob-loaded magnesium-modified adsorption material and preparation method and application thereof
CN107126924A (en) Modified magnetic sludge organism charcoal and its preparation method and application
CN106423051A (en) Preparation method and application of magnetic activated hydrothermal biochar microspheres
CN113171766B (en) Preparation method and application of ternary magnetic nano graphite phase carbon nitride material integrating oil absorption/adsorption of metal ions/photocatalysis
CN111001388B (en) Preparation method and application of bamboo-based biochar phosphorus removal adsorbent
CN107497399A (en) A kind of charcoal/bentonite composite material and its preparation method and application
CN113634228B (en) Sludge biochar loaded magnesium-iron oxide composite material for removing lead and cadmium in water and preparation method and application thereof
CN105688820A (en) Method for processing sludge in urban sewage treatment plant to synthesize mesoporous carbon material through template-like method
CN114029035A (en) Preparation method of modified sludge biochar, obtained biochar and application
CN114146683B (en) Method for preparing carbon-based adsorption material by deeply treating coagulated sludge with sewage and application thereof
CN114177891A (en) Preparation method of biochar composite metal organic framework adsorbing material
CN110775985A (en) Process for synthesizing analcite from red mud by hydrothermal alkaline method
CN111729654A (en) Preparation method and application of modified pagodatree leaf biochar
CN108636353B (en) domestic sewage sludge/rectorite compound and preparation method and application thereof
CN113000025B (en) Phosphorus removal adsorbent and preparation method and application thereof
Yang et al. Mechanism of sulfamethoxazole adsorption on wastewater-sludge-based biochar: Sludge type and modification improvement
CN112717878A (en) Substrate adsorption material with nitrogen and phosphorus removal functions and preparation method and application thereof
CN108892342B (en) Preparation method of composite material for fixing heavy metals in water body sediment
CN112499752A (en) Preparation method and application of coagulated sludge-based granular filler for water treatment
Zhang et al. Preparation of ultrahigh-surface-area sludge biopolymers-based carbon using alkali treatment for organic matters recovery coupled to catalytic pyrolysis
CN100400139C (en) Nano-crystallite composite filtering material and preparation method thereof
CN114196408B (en) Arsenic-polluted farmland stabilizer, preparation method and application thereof
CN114259986A (en) Preparation method of magnetic activated carbon-red mud-attapulgite composite adsorbent
KR101563984B1 (en) Method for manufacturing adsorbent using waste paper sludge

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant