CN107512746B - Filtering agent produced by municipal sludge and used for treating sewage and preparation method thereof - Google Patents
Filtering agent produced by municipal sludge and used for treating sewage and preparation method thereof Download PDFInfo
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- 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
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/041—Oxides or hydroxides
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- 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
- B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
- B01J20/08—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04 comprising aluminium oxide or hydroxide; comprising bauxite
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- 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
- B01J20/103—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate comprising silica
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- 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
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- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
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- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/02—Odour removal or prevention of malodour
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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Abstract
The invention relates to a filtering agent for treating sewage produced by municipal sludge and a manufacturing method thereof, which is characterized in that the filtering agent is prepared by adopting municipal sludge, preparing powder materials through high-temperature burning, crushing, sorting, crushing, grinding and screening, and taking the powder materials, garbage burning ash, calcium hydroxide, chlorine dioxide, anhydrous aluminum trioxide and polyacrylamide as raw materials; then the uniformly mixed filtering agent is conveyed to a special storage silo and is packaged by a full-automatic electronic metering and weighing packaging machine system to prepare a filtering agent product; the product reaches the national industry standard through inspection; the product comprehensively utilizes solid wastes as resources, changes wastes into valuables, changes chemical hazards into benefits, has no pollution, low cost and good benefits, and meets the national requirements on energy conservation, emission reduction and ecological environment protection.
Description
Technical Field
The invention relates to a filtering agent for treating sewage produced by municipal sludge, in particular to a filtering agent produced by using municipal sludge, sludge powder after mechanical dehydration and high-temperature incineration and waste incineration ash powder as main raw materials, belonging to the field of waste treatment.
The invention also relates to a preparation method of the filtering agent.
Background
The municipal sludge is a mixed waste of sediments generated in the process of treating domestic sewage, rainwater collected by a municipal pipe network and industrial wastewater by a municipal sewage treatment plant and residues floating on the surface of sewage, and generally has the water content of 93-99 percent; the components and sources of the sludge are complex, and the sludge contains a large amount of various nutrient elements of nitrogen, phosphorus and potassium, organic pollutants, heavy metal elements and toxic and harmful substances; with the rapid development of industrial production and economy in China, the continuous increase of urban population and the rapid development of urban construction, the discharge amount of industrial wastewater and domestic sewage is increasing day by day, and with the increase of sewage treatment amount, the generation amount of sludge is also rapidly increased; the sludge accumulated in large amount not only occupies a large amount of land, but also has harmful components such as heavy metals; copper, chromium, arsenic, mercury, cadmium, pathogenic bacteria, parasitic ova, organic pollutants and odor become a great public nuisance which influences the urban environmental sanitation; effective treatment technologies are actively searched by governments and related departments at all levels, and the treatment method of municipal sludge in China at present mainly adopts a landfill method to reduce the pollution to the environment; however, the components of the sludge are complex, particularly heavy metals, if the sludge is not treated and directly buried, the sludge can pollute soil and underground water resources, secondary pollution is easy to form, and the sludge causes harm to the environment; the long-term landfill needs to occupy a large amount of land resources, and how to properly and scientifically treat and dispose the municipal sludge to achieve reduction, stabilization, harmlessness and resource utilization becomes one of the large research topics which are widely concerned by scientific researchers in China and even the world environment.
Disclosure of Invention
The invention aims to solve the problems and provide a filtering agent for treating sewage, which is produced by using municipal sludge, so that the pollution of the municipal sludge to the environment is solved, the resource recycling of the municipal sludge is also realized, the waste is changed into valuable, the harm is changed into benefit, and the virtuous cyclic utilization of the waste resources is realized.
The invention also provides a preparation method of the filtering agent.
The invention aims to realize the effect through the following technical scheme;
a filtering agent for treating sewage produced by municipal sludge is characterized by being prepared from the following raw materials in parts by weight:
55-68 parts of municipal sludge powder
35-48 parts of waste incineration ash powder
18-26 parts of calcium hydroxide
6-9 parts of chlorine dioxide
6-10 parts of anhydrous aluminum trioxide
5-8 parts of polyacrylamide
The municipal sludge is mixed waste of sediments generated in the process of treating domestic sewage, rainwater and industrial wastewater collected by a municipal pipe network and industrial wastewater by a municipal sewage treatment plant and residues floating on the surface of sewage, and the water content is generally 93-99%; mechanically dewatering until the water content is below 80%, and burning the municipal sludge at high temperature by adopting a full-automatic mechanical dynamic double-cylinder rotary kiln; with screw conveyer, carry kiln tail feeding entry with municipal sludge, make in municipal sludge can the automatic kiln that enters into, along with the rotation of the kiln body, municipal sludge slowly passes through kiln body drying area, wherein: the rotating speed of the kiln body is 2.0-2.6/min, the drying temperature is 220-250 ℃, and the drying time is 30 min; entering a preheating incineration area, wherein the preheating temperature is 350-400 ℃, and the time is 30-35 min; and (3) entering a high-temperature incineration area, wherein the rotating speed of a kiln body is 2.8-4.0/min, and the incineration temperature is controlled to be a temperature suitable for the municipal sludge incineration slag to form small particles: the temperature is 750-950 ℃, and the time is controlled to be 30-40 min; organic pollutants with too low temperature are not completely combusted, malodorous gas is easily formed, the environment is polluted, the temperature is too high, municipal sludge incineration slag is easily agglomerated into large blocks, the formation of small particles is not facilitated, the investment of crushing equipment and a process flow is required to be increased, and the production cost cannot be effectively reduced; therefore, the requirement on the control of the incineration temperature of the municipal sludge is strict, and after the municipal sludge powder discharged from the kiln after high-temperature incineration is cooled, the powder with the particle size of less than 0.045mm is prepared by adopting a multistage vibrating screen for screening;
the waste incineration ash powder is waste residue discharged after domestic garbage is subjected to high-temperature incineration power generation, and is prepared into powder with the particle size of less than 0.045mm after sorting, magnetic separation to remove waste metal, drying, crushing, grinding and screening;
the manufacturing method for producing the filtering agent for treating sewage by using the municipal sludge is characterized by comprising the following steps of:
raw materials of 55-68 parts by weight of municipal sludge powder, 35-48 parts by weight of waste incineration ash powder, 18-26 parts by weight of calcium hydroxide, 6-9 parts by weight of chlorine dioxide, 6-10 parts by weight of anhydrous aluminum trioxide and 5-8 parts by weight of polyacrylamide are mixed and stirred by a double-shaft paddle mixing stirrer, so that the materials are subjected to mechanical action in a machine body to generate comprehensive composite circulation, and are widely staggered without dead angles, thereby achieving the purpose of uniformly diffusing and mixing the filtering agent; and then the uniformly mixed filtering agent powder is conveyed to a special storage silo and packaged by a full-automatic electronic metering weighing packaging machine system to prepare a filtering agent product.
The invention selects the municipal sludge incineration ash as the raw material of the sewage treatment filtering agent, and mainly utilizes the chemical active component (SiO) of the municipal sludge incineration ash which is made into fine powder2And Al2O3) (ii) a The municipal sludge incineration ash is mixed waste of sediments generated in the process of treating domestic sewage, rainwater and industrial wastewater collected by a municipal pipe network and industrial wastewater by a municipal sewage treatment plant and residues floating on the surface of sewage, and generally has the water content of 93-99 percent; after mechanical dehydration, the water content is below 80%, and a waste residue generated in the process of high-temperature incineration of the municipal sludge is treated by adopting a mechanical dynamic double-cylinder rotary kiln, and along with the complete combustion and temperature rise of porous carbon particles and organic pollutants in the sludge in the high-temperature combustion process of the municipal sludge, minerals in the municipal sludge are dehydrated, decomposed and oxidized into inorganic oxidized substances; the sludge incineration ash particles become porous glass bodies, and the specific surface area is obviously smaller than that of the porous carbon particles although the shape of the sludge incineration ash particles is still basically the same as that of the porous carbon particles; the porous glass body is gradually melted and shrunk to form particles, the porosity is continuously reduced, the roundness is continuously improved, the particle size is continuously reduced, finally, the porous glass body is converted into a compact sphere with higher density and smaller particle size, and the specific surface area of the particles is reduced to the minimum; soot particles of different sizes and densities have significant chemical and mineralogical characteristics, with small particles generally being more glassy and chemically active than large particles; through research and analysis, the municipal sludge incineration ash residueSiO 22The contents are as follows: 36.65%, 48.53%; al (Al)2O3The contents are as follows: 16.52% -18.68%; sorting municipal sludge incineration ash, removing waste metals by magnetic separation, crushing, grinding and screening to prepare powder with the fineness and the grain size of less than 0.045 mm; the adsorption function, flocculation precipitation and filtration interception function of the municipal sludge incineration ash for treating sewage are improved after the municipal sludge incineration ash is made into fine powder.
The invention selects the waste incineration ash as the raw material of the sewage treatment filtering agent, and mainly utilizes the chemical active component (SiO) obtained by grinding the waste incineration ash into fine powder2And Al2O3) The garbage incineration ash is waste residue generated in the process of high-temperature incineration power generation of household garbage, mineral substances in the garbage are dehydrated, decomposed and oxidized into inorganic oxidation substances along with complete combustion of organic substances in the porous carbon granules and temperature rise of the household garbage in the high-temperature combustion process, and at the moment, garbage ash granules become porous glass bodies, although the form of the garbage ash granules is still basically the same as that of the porous carbon granules, the specific surface area of the garbage ash granules is obviously smaller than that of the porous carbon granules; the porous glass body is gradually melted and shrunk to form particles, the porosity is continuously reduced, the roundness is continuously improved, the particle size is continuously reduced, finally, the porous glass body is converted into a compact sphere with higher density and smaller particle size, and the specific surface area of the particles is reduced to the minimum; soot particles of different sizes and densities have significant chemical and mineralogical characteristics, with small particles generally being more glassy and chemically active than large particles; wherein SiO in the waste incineration ash2The contents are as follows: 35.63%, 42.56%; al (Al)2O3The contents are as follows: 12.50% -18.67%; sorting waste incineration ash, removing waste metals by magnetic separation, drying, crushing, grinding and screening to prepare powder with the fineness and the grain diameter of less than 0.045 mm; the adsorption effect, flocculation precipitation and filtration interception of the waste incineration ash after being prepared into fine powder are improved;
the adsorption effect of the waste incineration ash powder in the sewage treatment and filtration process comprises physical adsorption and chemical adsorption; physical adsorption means that the adsorption is generated between the waste incineration ash powder and pollutant molecules of adsorbate through intermolecular attraction, and the function is determined by the porosity and the specific surface area of the waste incineration ash powder; chemical adsorption means that a large amount of active ingredients of aluminum, iron and silicon exist in the waste incineration ash powder, and the active ingredients can strongly adsorb a plurality of negatively charged colloidal particles in sewage to generate flocculation; in addition, the waste incineration ash powder also contains coagulant aids, such As nickel (Ni), cobalt (C0), arsenic (As), sodium (Na), lithium (Li) and calcium (Ca), so that the sedimentation of the waste incineration ash powder can be promoted; the chemical adsorption has the characteristic of strong selectivity, and under the common condition, the physical adsorption and the chemical adsorption exist at the same time, but the advantages expressed under different conditions of pH value and temperature are different, so that the adsorption performance of the waste incineration ash powder is changed; in addition, the waste incineration ash powder is a mechanical mixture of various particles and has high porosity, so that when sewage passes through the waste incineration ash powder, the waste incineration ash powder can filter and retain most suspended matters.
The main influence factors of the waste incineration ash powder in the process of sewage treatment and filtration are as follows: (1) the particle size fineness of the waste incineration ash powder is small, the specific surface area of the waste incineration ash powder is large, the finer the particle size of the waste incineration ash powder is, the larger the specific surface area of the waste incineration ash powder is, and the better the sewage treatment and filtration effect is; (2) the chemical components of the waste incineration ash powder are as follows: the content of active substances of SiO and A1O in the waste incineration ash powder is high, which is beneficial to chemical adsorption; (3) pH value: the pH value directly influences the treatment and filtration effect of the sewage, but the influence result of the pH value is related to the property of the adsorbate; (4) temperature: the lower the temperature is, the higher the removal rate of the waste incineration ash powder to harmful substances in the sewage is; (5) the nature of the adsorbate: the solubility, molecular polarity, molecular weight, concentration and the like of the sewage pollutants have influence on the sewage treatment effect; the larger the molecular weight and the smaller the solubility, the better the treatment effect.
The function of the waste incineration ash powder in sewage treatment and filtration is as follows:
1 Effect of decolorization
The waste incineration ash powder has stronger adsorption capacity and good removal effect on the chroma, so that the method is applied to removal of industrial wastewater filtering chroma; tests show that the mixture of the printing and dyeing textile wastewater, the boiler wastewater, the waste incineration ash powder and the water is mixed together for sewage filtration treatment, the chroma removal rate is up to 95 percent, the waste incineration ash powder is used as a flocculating agent for treating the sewage of a paper mill, and tests show that the wastewater after the same sewage is subjected to the waste incineration ash powder filtration treatment is colorless and odorless; a series of research experiments are carried out on the decolorizing capacity of the waste incineration ash powder, and the test results of the filtering decolorizing capacity of the waste incineration ash powder to reactive dyes, acid dyes, direct dyes, cationic dyes, hydrophobizing dyes and vat dyes show that the decolorizing rate of the waste incineration ash powder is 95-98 percent, and the strong adsorption capacity of the waste incineration ash powder to the dyes is proved.
2 removal of organic contaminants
The waste incineration ash powder has better treatment effect on organic pollutants and SS in various sewage; the domestic sewage is subjected to a filtration treatment test, which shows that the waste incineration ash powder has a strong adsorption effect on COD in the domestic sewage, and when the ash-water ratio is 1: when 10 hours, the average removal rate of the waste incineration ash powder to COD in the sewage reaches more than 88 percent.
3 removal of heavy metal ions
Test researches show that the waste incineration ash powder has better adsorption effect on some heavy metals, and the adsorption removal rate is between 50 and 97 percent; the pH value has certain influence on the effect of adsorbing heavy metal ions by the waste incineration ash powder, and the proper pH value is 4-7; the waste water containing Cr is treated by taking the waste incineration ash powder as a main component, 1 t of waste water containing Cr30.8mg/L and pH value = 4.00 is treated, the concentration of Cr3+ is reduced to below 1 mg/L only by 1.5 kg, the removal rate reaches more than 97 percent, and the waste water containing Cr (VI) is subjected to purification treatment tests by utilizing the waste incineration ash powder, and the results show that the removal of Cr (VI) is mainly an adsorption process of the waste incineration ash powder, and the adsorption rate and the concentration of Cr (VI) in the waste water form a linear relationship, so that the adsorption effect is good; the adsorption performance of the waste incineration ash powder on Cu shows that under proper conditions, the removal result of the waste incineration ash powder on Cu is very good; the adsorption effect of the waste incineration ash powder on Hg is even better than that of active carbon, and the removal rate can reach 99%.
4 removal of fluorine and phosphorus
According to the research of treating fluorine-containing wastewater by utilizing the waste incineration ash powder, the fluorine-containing wastewater is treated by utilizing the waste incineration ash powder, the fluorine removal rate of sewage containing 20-100 mg/L fluorine can reach more than 50%, and the fluorine content of the sewage can be reduced to be below the discharge standard of industrial wastewater by utilizing the fluorine removal effect of integrating the waste incineration ash powder and calcium hydroxide; the waste incineration ash powder has a certain removal effect on phosphorus in the domestic sewage, and the removal rate reaches 60-70%; treating the fluorine-containing acidic wastewater by adopting a stirring suspension method, wherein when the grey-water ratio is 1: l0, stirring L h to reduce the mass concentration of fluorine in the raw sewage from 700 mg/L to L0mg/L and increase the pH value from 2-3 to 6-7; the high-concentration fluorine-containing and phosphorus-containing chemical wastewater is treated by adopting a mixing and filtering process of calcium hydroxide and waste incineration ash powder, so that the mass concentration of fluorine and phosphorus is reduced to 15mg/L and L mg/L from 150 mg/L and 30mg/L respectively.
The invention selects polyacrylamide as a flocculating agent in sewage filtration treatment, wherein the polyacrylamide is named as the Chinese alias: flocculant No. 3, PAM for short; polyacrylamide is also known as a No. three coagulant; the polyacrylamide is divided into anionic polyacrylamide, cationic polyacrylamide, nonionic polyacrylamide and amphoteric polyacrylamide; the English name, PAM (acrylamide), abbreviation: PAM polyacrylamide is a water-soluble linear high molecular polymer which is formed by polymerizing Acrylamide (AM) monomers through free radical initiation, is insoluble in most organic solvents, has good flocculation property, can reduce the frictional resistance between sewage, and can be divided into four types of non-ions, anions, cations and amphiprotic types according to the ionic characteristics; the mesh number of polyacrylamide is: the mesh number refers to the granularity or thickness of the material, is the number of squares on a unit area, and is generally defined as the number of meshes in an area of 1 inch x1 inches, namely the number of meshes of the screen; for example, 600 mesh is 600 square mesh holes per square inch, the mesh number of polyacrylamide is generally 20 mesh to 80 mesh, i.e., 0.85mm to 0.2mm, which is a granuleThe mesh size of the powdery polyacrylamide can be controlled to be about 100 meshes, and the polyacrylamide with larger mesh is easier to dissolve; the polyacrylamide is white powder or small granule with density of 1.32g/cm3(23 ℃) with a glass transition temperature of 188 ℃ and a softening temperature of approximately 210 ℃, which generally contains a small amount of water when dried, and quickly absorbs water from the environment when dried, the homopolymer isolated by freeze-drying is a white, fluffy, non-crystalline solid, but when precipitated from solution and dried is a glassy, partially transparent solid, the completely dried polyacrylamide PAM is a brittle white solid, and commercial polyacrylamide drying is generally carried out under moderate conditions; typically, the water content is five to fifteen percent, and the polymer film prepared by casting on a glass plate is a transparent, hard, brittle solid; the stereo structure is mainly atactic; thermal stability: the decomposition is easy when the temperature exceeds 120 ℃; solubility: dissolving in water, not dissolving in organic solvent such as benzene, toluene, ethanol, acetone, esters, etc., and dissolving in ethylene glycol, glycerol, formamide, lactic acid, and acrylic acid by about 1%; toxicity: is nontoxic; corrosion property: no corrosion; moisture absorption: the solid is hygroscopic.
The invention selects anhydrous aluminum trichloride as a coagulant, wherein the aluminum trichloride is also called polyaluminum chloride and has the main index of aluminum oxide (Al)2O3) The content of (2) is even, stable, very easily control in the index range, can strengthen the filterable adsorption capacity of granule, play and condense and two kinds of effects of flocculation, the salinity of polyaluminium chloride, when being used for handling sewage, the salinity is degree of polymerization degree height directly influences the water purification effect, still can be according to quality of water difference, in good time the size of adjustment salinity.
The invention selects chlorine dioxide as a disinfection, deodorization and bactericide in the filtering agent, wherein the chlorine dioxide is a product prepared by the action of sodium chlorate, sulfuric acid and methanol or the action of sodium chlorate and sulfur dioxide; chlorine dioxide is prepared by reducing chlorate serving as a raw material in a sulfuric acid medium; has the functions of sterilization, bleaching, deodorization, disinfection and fresh keeping; the action mechanism is mainly oxidation, the electronic structure of the chlorine dioxide molecule is in an unsaturated state, the outer layer has 19 electrons, the chlorine dioxide molecule has strong oxidation, and the chlorine dioxide molecule mainly attacks atomic groups rich in electrons (or electron donors) (such as enzyme, sulfide and chloride containing sulfydryl) and forcibly grazes the electrons to enable the electrons to become substances losing activity and changing properties, so that the aim is fulfilled; 1. the chlorine dioxide has stronger adsorption and penetration capacity to cell walls, and releases atomic oxygen to oxidize enzymes containing sulfydryl in cells to play a role in sterilization; 2. the bleaching of chlorine dioxide is to release atomic oxygen and produce hypochlorite to decompose pigment; the bleaching agent is used as a bleaching agent to replace chlorine and chlorate, so the effect is more comprehensive; 3. deodorization effect, chlorine dioxide is deodorized because it can generate dehydration reaction with odor substances (such as H2S, -SOH, -NH2) and make the odor substances quickly oxidized and converted into other substances, and simultaneously kill microorganisms without reacting with fatty acid; the chlorine dioxide has a safety effect, and can oxidize cyanide into carbon dioxide and nitrogen, namely, when the concentration of the cyanide is 3.0mg/L, the addition amount of the chlorine dioxide is 5.0mg/L when the cyanide is 2ClO2+2CN =2CO2+ N2+2Cl, and the removal rate of the cyanide is generally over 85 percent; the advantages that a large number of foreign experimental studies show that chlorine dioxide is a safe and nontoxic disinfectant, has no 'three-cause' effect (carcinogenesis, teratogenicity and mutagenicity), and does not generate chlorination reaction with organic matters to generate organic chloride or other toxic substances which can generate 'three-cause' effect in the disinfection process; but because chlorine dioxide has extremely strong oxidizing power, the chlorine dioxide is not used at high concentration (>500 ppm); when the concentration is lower than 100ppm, the composition does not have any influence on human bodies, including physiological and biochemical influences; has no sensitization to skin; therefore, chlorine dioxide is also internationally recognized as a safe, non-toxic, green sanitizer.
The invention relates to a manufacturing method of a filtering agent for treating sewage in municipal sludge production, which is characterized in that raw materials of municipal sludge powder, waste incineration ash powder, calcium hydroxide, chlorine dioxide, anhydrous aluminum trioxide and polyacrylamide are mixed and stirred by a double-shaft paddle mixing stirrer, so that the materials are subjected to mechanical action in a machine body to generate comprehensive composite circulation, and the comprehensive composite circulation is carried out in a staggered way without dead angles, thereby achieving the purpose of uniformly diffusing and mixing the filtering agent; then conveying the uniformly mixed filtering agent powder to a special storage silo, and packaging by adopting a full-automatic electronic metering weighing packaging machine system to prepare a filtering agent product; thereby solving the problem of difficult treatment of the municipal sludge, realizing the resource recycling of the municipal sludge and reducing the pollution to the natural ecological environment.
The raw materials of the invention can also be made into other filtering agents with different specifications and models.
The urban sludge filtering agent produced according to the technology of the invention is tested by the product quality testing department of the technical supervision bureau, and all technical indexes of the urban sludge filtering agent meet the standard requirements of the chemical industry of the people's republic of China on granular carclazyte.
The detection result of the product quality inspection center is as follows:
and (3) detecting the urban sludge filtering agent: according to the standard of ' granular clay ' in the chemical industry of HG/T2825-2009 people's republic of China,
and (3) detection results:
a) fineness: d90/mum 5.0μm;
b) specific surface area/(cm)2/g）： 580；
c) Initial olefin removal activity (mLBr/100 g oil): 3.8 of the total weight of the mixture;
d) water content%: 5.8;
e) bulk density (g/mL): 0.6 to 0.8;
f) particle compressive resistance/N: 3.8 of the total weight of the mixture;
g) percent decolorization: 96.8 parts of;
the detection result meets the requirements of national industry standards.
Due to the adoption of the technical scheme, the technology has the following advantages and effects:
a) the municipal sludge filtering agent takes municipal sludge and waste incineration ash as raw materials, is used for recycling solid waste, realizes the comprehensive utilization of the municipal sludge and the waste incineration ash as resources, and protects the environment for energy conservation, emission reduction and emission reduction;
b) the problems that a large amount of land resources are required to be occupied and secondary pollution is easily caused in the process of landfill of the municipal sludge and the waste incineration ash are solved, the ecological environment is protected, the land is saved, and the recycling comprehensive utilization rate of the municipal sludge and the waste incineration ash is up to more than 98%;
c) the filtering agent is produced by using the municipal sludge and the waste incineration ash, is a green, environment-friendly and energy-saving product, and has wide development prospect;
d) the production process is simple, three wastes are not discharged, the requirements of national policies of energy conservation and emission reduction, low-carbon economy development and recycling economy are met, the investment is low, the effect is fast, the cost is low, and the benefit is good.
Detailed Description
Example 1
The municipal sludge is a mixed waste of sediments generated in the process of treating domestic sewage, rainwater and industrial wastewater collected by a municipal pipe network and industrial wastewater by a municipal sewage treatment plant and residues floating on the surface of sewage, and the water content is generally 93-99%; mechanically dewatering until the water content is below 80%, and burning the municipal sludge at high temperature by adopting a full-automatic mechanical dynamic double-cylinder rotary kiln; with screw conveyer, carry kiln tail feeding entry with municipal sludge, make in municipal sludge can the automatic kiln that enters into, along with the rotation of the kiln body, municipal sludge slowly passes through kiln body drying area, wherein: the rotating speed of the kiln body is 2.0-2.6/min, the drying temperature is 220-250 ℃, and the drying time is 30 min; entering a preheating incineration area, wherein the preheating temperature is 350-400 ℃, and the time is 30-35 min; and (3) entering a high-temperature incineration area, wherein the rotating speed of a kiln body is 2.8-4.0/min, and the incineration temperature is controlled to be a temperature suitable for the municipal sludge incineration slag to form small particles: the temperature is 750-950 ℃, and the time is controlled to be 30-40 min; organic pollutants with too low temperature are not completely combusted, malodorous gas is easily formed, the environment is polluted, the temperature is too high, sludge incineration slag is easily agglomerated into large blocks, small particles are not easily formed, the investment of crushing equipment and a crushing process flow is required to be increased, and the production cost cannot be effectively reduced; therefore, the requirement on the control of the incineration temperature of the municipal sludge is strict, and after the municipal sludge powder discharged from the kiln after high-temperature incineration is cooled, the powder with the particle size of less than 0.045mm is prepared by adopting a multistage vibrating screen for later use;
waste incineration ash, which is waste residue discharged after domestic garbage is subjected to high-temperature incineration power generation, is prepared into powder with the particle size of less than 0.045mm for later use after sorting, magnetic separation to remove waste metals, drying, crushing, grinding and screening;
taking 55kg of the prepared municipal sludge powder, 35kg of waste incineration ash powder, 18kg of calcium hydroxide, 6kg of chlorine dioxide, 6kg of anhydrous aluminum trioxide and 5kg of polyacrylamide as raw materials, and mixing and stirring the raw materials by adopting a double-shaft paddle mixing stirrer, so that the materials are subjected to mechanical action in a machine body to generate comprehensive compound circulation, and the comprehensive compound circulation is carried out in a wide staggered manner without dead angles, thereby achieving the purpose of uniformly diffusing and mixing the filtering agent; then conveying the uniformly mixed filtering agent powder to a special storage silo, and packaging by adopting a full-automatic electronic metering weighing packaging machine system to prepare a filtering agent product; the product meets the requirements of national industry standard through inspection.
Example 2
68kg of municipal sludge powder, 48kg of waste incineration ash powder, 26kg of calcium hydroxide, 9kg of chlorine dioxide, 10kg of anhydrous aluminum trichloride and 8kg of polyacrylamide are taken as raw materials, and a double-shaft paddle mixing stirrer is adopted for mixing and stirring, so that the materials are subjected to mechanical action in a machine body to generate comprehensive composite circulation, and the comprehensive composite circulation is carried out in a wide staggered mode without dead corners, and the purpose of uniformly diffusing and mixing the filtering agent is achieved; then conveying the uniformly mixed filtering agent powder to a special storage silo, and packaging by adopting a full-automatic electronic metering weighing packaging machine system to prepare a filtering agent product; the product meets the requirements of national industry standard through inspection.
Example 3
The method comprises the following steps of taking 58kg of municipal sludge powder, 38kg of waste incineration ash powder, 20kg of calcium hydroxide, 7kg of chlorine dioxide, 7kg of anhydrous aluminum trichloride and 6kg of polyacrylamide which are used as raw materials in the embodiment 1, and mixing and stirring the raw materials by adopting a double-shaft paddle mixing stirrer, so that the materials are subjected to mechanical action in a machine body to generate comprehensive compound circulation, and the comprehensive compound circulation is carried out in a staggered way without dead angles, thereby achieving the purpose of uniformly diffusing and mixing the filtering agent; then conveying the uniformly mixed filtering agent powder to a special storage silo, and packaging by adopting a full-automatic electronic metering weighing packaging machine system to prepare a filtering agent product; the product meets the requirements of national industry standard through inspection.
Example 4
62kg of municipal sludge powder, 42kg of waste incineration ash powder, 22kg of calcium hydroxide, 8kg of chlorine dioxide, 8kg of anhydrous aluminum trichloride and 7kg of polyacrylamide are taken as raw materials, and a double-shaft paddle mixing stirrer is adopted for mixing and stirring, so that the materials are subjected to mechanical action in a machine body to generate comprehensive composite circulation, and the comprehensive composite circulation is carried out in a wide staggered mode without dead corners, and the purpose of uniformly diffusing and mixing the filtering agent is achieved; then conveying the uniformly mixed filtering agent powder to a special storage silo, and packaging by adopting a full-automatic electronic metering weighing packaging machine system to prepare a filtering agent product; the product meets the requirements of national industry standard through inspection.
Example 5
Taking 66kg of municipal sludge powder, 46kg of waste incineration ash powder, 24kg of calcium hydroxide, 9kg of chlorine dioxide, 9kg of anhydrous aluminum trichloride and 8kg of polyacrylamide as raw materials of the embodiment 1, and mixing and stirring the raw materials by adopting a double-shaft paddle mixing stirrer to ensure that the materials are subjected to mechanical action in a machine body to generate comprehensive composite circulation, and the comprehensive composite circulation is carried out in a staggered way without dead angles, so that the aim of uniformly diffusing and mixing the filtering agent is fulfilled; then conveying the uniformly mixed filtering agent powder to a special storage silo, and packaging by adopting a full-automatic electronic metering weighing packaging machine system to prepare a filtering agent product; the product meets the requirements of national industry standard through inspection.
Claims (2)
1. A filtering agent for treating sewage produced by municipal sludge is characterized by being prepared from the following raw materials in parts by weight:
55-68 parts of municipal sludge powder
35-48 parts of waste incineration ash powder
18-26 parts of calcium hydroxide
6-9 parts of chlorine dioxide
6-10 parts of anhydrous aluminum trioxide
5-8 parts of polyacrylamide
The municipal sludge is mixed waste of sediments generated in the process of treating domestic sewage, rainwater and industrial wastewater collected by a municipal pipe network and industrial wastewater by a municipal sewage treatment plant and residues floating on the surface of sewage, and the water content is generally 93-99%; mechanically dewatering until the water content is below 80%, and burning the municipal sludge at high temperature by adopting a full-automatic mechanical dynamic double-cylinder rotary kiln; with screw conveyer, carry kiln tail feeding entry with municipal sludge, make mud can enter into the kiln automatically, along with the rotation of the kiln body, municipal sludge slowly passes through kiln body drying area, wherein: the rotating speed of the kiln body is 2.0-2.6 r/min, the drying temperature is 220-250 ℃, and the drying time is 30 min; entering a preheating incineration area, wherein the preheating temperature is 350-400 ℃, and the time is 30-35 min; and (3) entering a high-temperature incineration area, wherein the rotating speed of a kiln body is 2.8-4.0 r/min, and the incineration temperature is controlled to be a temperature suitable for the municipal sludge incineration slag to form small particles: the temperature is 750-950 ℃, and the time is controlled to be 30-40 min; organic pollutants with too low temperature are not completely combusted, malodorous gas is easily formed, the environment is polluted, the temperature is too high, municipal sludge incineration slag is easily agglomerated into large blocks, the formation of small particles is not facilitated, the investment of crushing equipment and a process flow is required to be increased, and the production cost cannot be effectively reduced; therefore, the requirement on the control of the incineration temperature of the municipal sludge is strict, and after the municipal sludge powder discharged from the kiln after high-temperature incineration is cooled, the powder with the particle size of less than 0.045mm is prepared by adopting a multistage vibrating screen for screening;
the waste incineration ash powder is waste residue discharged after domestic garbage is subjected to high-temperature incineration power generation, and is prepared into powder with the particle size of less than 0.045mm after sorting, magnetic separation to remove waste metal, drying, crushing, grinding and screening.
2. The method for producing filtering agent for sewage treatment from municipal sludge according to claim 1, wherein the method comprises the following steps:
raw materials of 55-68 parts by weight of municipal sludge powder, 35-48 parts by weight of waste incineration ash powder, 18-26 parts by weight of calcium hydroxide, 6-9 parts by weight of chlorine dioxide, 6-10 parts by weight of anhydrous aluminum trioxide and 5-8 parts by weight of polyacrylamide are mixed and stirred by a double-shaft paddle mixing stirrer, so that the materials are subjected to mechanical action in a machine body to generate comprehensive composite circulation, and are widely staggered without dead angles, thereby achieving the purpose of uniformly diffusing and mixing the filtering agent; and then the uniformly mixed filtering agent powder is conveyed to a special storage silo and packaged by a full-automatic electronic metering weighing packaging machine system to prepare a filtering agent product.
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| CN109796113A (en) * | 2019-01-31 | 2019-05-24 | 李健 | A kind of sludge and derivative manufacturing method of high speed processing moisture content 80 percent |
| CN114988926A (en) * | 2019-01-31 | 2022-09-02 | 李健 | Organic compound fertilizer produced by eighty percent of sludge with water content and manufacturing method thereof |
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| CN101559354B (en) * | 2009-04-29 | 2010-12-01 | 同济大学 | Preparation method of sludge absorber and applications thereof |
| CN101579682A (en) * | 2009-06-04 | 2009-11-18 | 浙江理工大学 | Mixing disposal method of incineration ash of municipal sludge and domestic garbage |
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