CN104743766B - A kind of dehydrated sludge of domestic sewage treatment plant freeze thawing treatment method and the purposes of gained sludge compound thing - Google Patents
A kind of dehydrated sludge of domestic sewage treatment plant freeze thawing treatment method and the purposes of gained sludge compound thing Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a kind of dehydrated sludge of domestic sewage treatment plant freeze thawing treatment method, by moisture content 80% ± 2% dewatered sludge, flyash and gangue press 2.5 4:1‑2:After 57 volume ratio mixing, it is stacked on ground, thickness freezes compound thing in 30 ± 5cm using the temperature that night in winter is below freezing, and before treating spring plantation, when temperature gets warm again after a cold spell, the compound thing of freezing melts, you can.The single freeze thawing treatment of the dewatered sludge of domestic sewage factory, can make the sludge after process fine and close, and poor air permeability, salinity are high, affect to emerge, the present invention cleverly blended with flyash and gangue by sludge after freeze thawing, solve this problem in that.Make use of winter natural endowment simultaneously, solve the problems, such as the odor contamination and pathogen contamination of sludge.Also, solve the problems, such as impact of the Heavy Metals in Sludge to plant.
Description
Technical field
The present invention relates to a kind of municipal sludge recycles technique.
Background technology
Municipal sludge is the deposit that municipal sewage plant is produced during the dirty water decontamination handles, is by organic residual
The extremely complex heterogeneous body of the compositions such as piece, microorganism, inorganic particle and colloid.Municipal sludge generally in black or
The flow-like material of pitchy, moisture content are high, and the moisture content of liquid sludge is 97% or so, and the moisture content of dewatered sludge is 80%
Left and right.In addition to containing ash, also containing substantial amounts of organic matter, pathogenic bacteria, parasite etc., arbitrarily stack and two can be brought to surrounding enviroment
Secondary pollution.With the quickening and the raising of municipal water treating capacity of Urbanization in China, the yield of sludge increases year by year
Long.
Sludge composting is agricultural, and according to the analysis of sludge composition itself, sludge is rich in Macro and microelements, for soil has one
Fixed fertilization；Relevant expert also eliminates harmful element to sludge itself and studies, and finds additive and eliminates harmful element,
Being passed to physics or chemical mode becomes a kind of fertilizer, used as agricultural or urban afforestation fertilizer.This is a kind of preferable
Treatment of Sludge mode, but the searching and manufacture of additive or fermentation enzyme is its difficult point because sludge nature and into
Point uncertain factor, even if the additive that searches out can be caused to be suitable for this kind of sludge, but other sludge are differed surely
Good Fertilizer Transformed is played, while preferably additive cost is also difficult to the appraisal.
Sludge drying is then after mechanical sludge dewatering, is further dried, the sludge or utilization after mummification
Or burn.The purpose of mummification, is sludge is further dehydrated, and from after mechanical dehydration, moisture content is about 80% state, enters
One step is dewatered to 10%～50%, has on the one hand carried out effective volume reduction, and the sludge after another aspect mummification is transported, utilized all very
Convenient.But, this kind of method processing cost and technical requirements are high, and after mummification, sludge still has problem of outlet.
The burning disposal adaptability of sludge is stronger, can directly burn the sludge of high-moisture percentage, it is also possible to after burning and drying
The sludge of low-water-content, burning reduces can the volume of sludge.But it is big that sludge incineration processes one-time investment, operation maintenance
Costly.A large amount of harmful substances can be produced during burning, such as two English, sulfur dioxide, hydrochloric acid etc., limited by domestic incineration technology
System, two English pollution problems are not yet solved very well, and heavy metal smog is likely to cause secondary pollution with burning ashes.Additionally, burning
Burn the nutrient substance wasted in sludge.
Municipal sludge contains the plant nutrient element such as substantial amounts of organic matter and N, P, can improve soil after being manured into soil
Fertility, promotes increasing crop yield, is the method for disposal for being suitable for China's actual conditions. and the chemical composition of municipal sludge is because of sewage source
Different but general all more or less containing heavy metals such as a certain amount of Cu, Pb, Zn, Ni, Cr, Hg, Cd. therefore, its heavy metal is asked
The agricultural environmental risk of municipal sludge that topic is all that fears are entertained that all the time, and become the barrier for limiting its extensive Land_use change
Hinder factor.
Sludge of sewage treatment plant process is low with disposal efficiency, high cost, and emerging processing method continuously emerges in recent years.Natural
Used as a kind of clean energy resource, it is also a kind of common and effective method to be applied to Treatment of Sludge to cold energy.In northern China, put down within 1 year
In 100d or so, cold energy has a high potential pool period.Naturally the cold method of melting is that the ice age drops sludge with pump in the winter time using natural cold-energy
In input pond, using the heat produced in summer solar radiation or process water outlet, make to freeze sludge thawing, and then reach sludge
The change of character, freezes sludge and melts, and then reaches the change of sludge character, and dewatering, strainability, sedimentation function are obtained
To improvement.Freeze thawing conditioning can make mud, water two-phase laminated flow, and refrigerating process is also pathogenic microorganism inactivation process, and freeze thawing conditioning makes
Cell mechanical dehydration, loss of activity are conducive to the innoxious process of sludge, while abnormal smells from the patient is removed reduce ecological risk.
However, the freeze thawing treatment of sludge, is unfavorable for plant emergence.
Melilotus officinalis (Melilotus officinalis (L.) Lam.), are pulse family draft erect type biennial plant.
Pinniform trifoliolate leaf, lobule ellipse or lanceolar, long 1～1.5cm, wide 3～6mm.The life of raceme axil or basidixed, long and
Very thin, spend little, long 3～4mm., in Temperate Region in China, generally mid-April to mid-May, florescence, at the beginning of generally 6 months for period of seedling establishment
To 7 months at the beginning of.Productive phase, usually mid-July, the ecological ampliture of Melilotus suaveolens Ledeb. was very wide to by the end of August, from cool temperature zone to south subtropicses,
From the barren sandy beach in beach, to the high-cold steppe of height above sea level 3700m, all it is distributed.It adapt to precipitation scope be 300～
1700mm；Requirement to soil is not tight, from sandy soil to cohesive soil, from alkaline soil to acid soil, can be well adapted for, be adapted to
PH value be 4.5～9；In the winter time definitely in the case of 41 DEG C of -40 DEG C of lowest temperature and the summer highest temperature, can be smoothly through,
Therefore, the performance of the cold-resistant, drought-enduring of it, high temperature resistant, acid and alkali-resistance and resistance to soil depletion is all very strong, is excellent herbage, green manure, honey
Source plant and soil-and-water conservation effect.China be distributed mainly on the Inner Mongol, Heilungkiang, Jilin, Liaoning, Shanxi, Hebei, Henan,
The provinces and regions such as Shandong, Shaanxi, Gansu, Qinghai, Tibet, Zhejiang, Sichuan and Yunnan.
Content of the invention
The technical problem to be solved in the present invention is to overcome existing defect, there is provided one kind is conducive to emerging and low cost,
Free of contamination dehydrated sludge of domestic sewage treatment plant freeze thawing treatment method；
It is a further object of the present invention to provide a kind of substrate of the plant growing of utilization sludge key component；
It is yet another object of the invention to provide a kind of cultural method of Melilotus officinalis.
The purpose of the present invention is by the following technical programs implementing：
A kind of dehydrated sludge of domestic sewage treatment plant freeze thawing treatment method, by moisture content 80% ± 2% dewatered sludge,
Flyash and gangue press 2.5-4:1-2:5-7 volume ratio mixing after, be stacked on ground, thickness in 30 ± 2cm, using the winter
Night in season temperature below freezing, freezes compound thing, and before treating spring plantation, when temperature gets warm again after a cold spell, the compound thing of freezing disappears
Melt, you can.
A kind of substrate of plant growing, presses 3 by dewatered sludge, flyash and gangue:1:6 volume ratio composition.
The substrate of above-mentioned plant growing, is obtained according to claim 1 methods described.
The compound thing of dewatered sludge, flyash obtained by above-mentioned method and gangue blending freeze thawing is used as plant growing
The application of substrate.
Preferably, the plant growing substrate is Melilotus officinalis cultivation substrate.
A kind of cultural method of Melilotus officinalis, dewatered sludge, flyash and the bastard coal obtained using said method process
Cultivation matrix of the compound thing of stone blending freeze thawing directly as Melilotus officinalis.
The cultural method of above-mentioned Melilotus officinalis, comprises the steps：
1) substrate prepares：The compound thing for blending freeze thawing with dewatered sludge, flyash and gangue is loaded in flowerpot；
2) sow：The Melilotus officinalis seed for processing is sprinkling upon in substrate, same substrate 1cm～2cm is covered above thick；
3) daily management：Vegetation period, the water regime according to substrate water, to ensure the need of Melilotus officinalis growth
Will, Melilotus officinalis grow into 60～70 days results.
Preferably, the step 1) substrate be above-mentioned plant growing substrate.
Preferably, the step 1) in flowerpot back cut diameter be 17cm, lower port diameter be 14cm, high 18cm.
It is cenosphere that fly ash grain is most of.Bead surface is uneven, extremely uneven, and micropore is less.Coarse table
Face, the more cellular particle granules particle diameter of corner angle are concentrated between 1～10 μm, account for more than 85%.This is based on, fine coal
The granularity of ash is thinner, 2.1～2.4g/cm of proportion3, less than the density of soil particle, 0.5～1.0g/cm of unit weight3, specific surface area
2000～4000cm2/ g, equivalent to sand level on particle diameter.The ability of the ability of Powder ash adsorption vaporous water and water suction is big with soil
Cause identical.
Flyash is because be enriched alkali metal, alkali earth metal, and makes its pH value higher, and generally up to more than 11～12.
Flyash contains higher soluble-salt, typically between 0.16%～3.3%, wherein contains soluble silicon 1.45%, solubility
Al2O32.73%, and containing nutrients such as more rich potassium, nitrogen, phosphorus and calcium, boron, berylliums.From the chemical property of flyash,
The chemical improvement agent of soil, agrochemical raw material, the artificial soil of gardening can be used it as.
During the recycling that flyash is used for municipal sludge is processed by the present invention, municipal sludge is the necessarily product of urban development
Thing, the recycling of pollutant can mitigate ambient pressure, while the residual amount of energy in these wastes can be utilized.Flyash is at which
Play an important role in process.The present invention is mixed with sludge using the flyash of high ph-values, reduces the heavy metal activity in sludge.
And its trace element or the ingredient of plant nutrient, flyash processes sludge as alkaline stabiliser and can eliminate or significantly
Reduce pathogen content.
The inevitable outcome that gangue is coal mining, washing, produce during utilization, is mine environmental pollution and deterioration
One of main source, is the maximum solid waste of coal industry discharge capacity.Coal gangue hill exposed in a large number takes a large amount of arable land
Soil, causes a series of ecological environment problems and social problem, causes serious ecological disruption and environmental pollution.Coal gangue hill
Improvement is very urgent benefiting the nation and the people, benefiting future generations for a task, and the requirement of China coal industry sustainable development.
Present invention research effect of the sludge in Mine Abandoned Land is reclaimed, test to the improvement of Gangue Hill Mining Area in line with because
The policy of ground suiting measures to different conditions, gathers materials on the spot, and reasonably using the garbage in mining area, reaches the treatment of wastes with processes of wastes against one another, reduces the input of earthing, reduces
The purpose of the expense that reclaims.
The present invention is thick according to general spoil stockyard spoil layer depth, and sludge, flyash are directly used in reclaiming for coal gangue storage yard,
There is the green land physicochemical property that reclaims extreme, make plant be difficult the characteristics of growing, cleverly by sludge, flyash and gangue
Mixed with certain proportion, and by winter low temperature freeze thawing, be made into mixed-matrix, ultimately form a kind of afforesting matrix, for bastard coal
Tor is reclaimed, and is the first-selection of a kind of economic, practical and treatment in accordance with local conditions disposing sludge, is to widen to process increasing flyash
Another application, is the effective way of coal gangue hill ecological recovery.The ecological recovery that sludge, flyash are used for coal gangue hill
Engineering, had both realized the recycling of solid waste, had turned waste into wealth, while increase coal gangue hill reclaim the fertilizer of middle soil again
Power, reduces the destruction to soil and natural vegetation, increases environmental benefit and economic benefit.
In addition, the single freeze thawing treatment of the dewatered sludge of domestic sewage factory, going out for Melilotus officinalis and other plants can be suppressed
Seedling and growth, the controlled trial of the present invention is exactly such：The flocs stracture that sludge is changed using freezing melting process, concentrates
Organic pollution materials in sludge, such as phenols, aldehydes and organic acid substance.Cleverly by sludge and flyash and gangue
Freeze thawing after blending, solves the problems, such as that single freeze thawing suppresses to emerge and grow.Make use of winter natural endowment simultaneously, solve dirt
The problem of the odor contamination and pathogen contamination of mud.Also, the content of beary metal of the application substrate disclosure satisfy that soil environment matter
Requirement in amount standard (GB15618-1995), solves the problems, such as impact of the Heavy Metals in Sludge to plant.Concrete analysis data
Referring to table 1, table 2, table 3, table 4, table 5.Before table 1 is the application compound thing and the dewatered sludge as controlled trial, soil freezing-thawing
Proportioning (volume fraction) afterwards, table 2 is the application substrate and compare substrate composition (volume fraction), and table 3 is the application substrate and right
Emerge according to Melilotus officinalis in substrate and growing state table, table 4 is the application substrate and the base before and after dewatered sludge, soil freezing-thawing
This physicochemical property, table 5 are content of beary metal and biological indicator before and after application substrate and dewatered sludge and soil freezing-thawing.
Proportioning and number table before and after 1 the application compound thing of table and dewatered sludge, soil freezing-thawing
2 the application substrate of table with compare substrate composition and number table
In 3 the application substrate of table and control substrate, Melilotus officinalis are emerged and growing state table
As known from Table 3, the compound thing after the application freeze thawing is used as substrate, emergence rate up to 71.55%, survival rate of seedlings 98%,
The level of soil is basically reached, and the ground diameter, plant height and fresh weight after culture in 65 days has been above the level of soil, it is seen that the application
Generate unexpected technique effect.
Analyze from emergence rate, used as substrate A2, emergence rate is compared the compound thing after the application freeze thawing up to 71.55%
According to after the direct freeze thawing of B-- dewatered sludges, the substrate of the compound thing of compound is higher by 67.95%, does not locate than control C-- dewatered sludges again
The substrate for managing direct compound thing is higher by 10.80%, fewer by 6.81% than compareing D2-- soil.As can be seen here, control B is emerged sporadicly several
Without Seedling.Through researching and analysing, its reason is in substrate that salinity is too high (electrical conductivity being shown in Table in 4), and changes after freeze thawing
The flocs stracture of sludge, concentrates the organic pollution materials in sludge, such as phenols, aldehydes and organic acid substance.Control C's
Emergence rate fewer than the application 10.80%, the environmental risk that there is stink pollution and pathogenic bacterium pollution again；Though the emergence rate of control D2
It is higher than so the application, but is more or less the same, moreover soil is in short supply, fetching earth ecological disruption of can also cause.Thus, in terms of emergence rate
Analysis, the application are with the obvious advantage.
From the point of view of survival rate of seedlings, used as substrate A2, survival rate of seedlings is up to 98%, fewer than compareing B for the compound thing after the application freeze thawing
2%th, it is probably that control B is emerged rareness, miss rate is low；2% more than control C, it is the base due to planting after the direct compound of dewatered sludge
The physicochemical property of matter is still unstable in initial planting, and especially pH value change substantially, causes seedling that death easily occurs；Than compareing D2
Few 1%, it is as the physicochemical property in initial planting soil is more stable, but is more or less the same.From this point of view, divide in terms of survival rate of seedlings
Analysis, the application substrate can be used as Melilotus officinalis and similar habit cultivation of plants substrate.
Analyze from ground diameter and plant height, the Melilotus officinalis that the compound thing after the application freeze thawing is cultivated as substrate are fifty-fifty
Up to 1.98mm, 30.26% more than control B, average plant height 38.3cm is higher by 7.28% than compareing B in footpath, because control B2's is multinomial
Physical and chemical index differs too big compared with D2 soil, even if having blended and A2 identical materials, still makes its growth restriction, occurs in that
Undesirable result；Average ground diameter than compareing C is few by 1.49%, average plant height few 6.13%, is as dewatered sludge is directly multiple
Plant after mixed, the nutrient content loss in substrate is less so that Seedling growth is vigorous；51.15% more than average ground diameter than control D2,
Average plant height many 21,59%, is due to the nutrient content of soil relatively low (being shown in Table 4), causes its growth weaker.From ground diameter and plant height
Aspect analysis, the application substrate are in superiority.
Analyze from overground part fresh weight, the Melilotus officinalis that the compound thing after the application freeze thawing is cultivated as substrate, per basin
Average aerial partss fresh weight 210.9g, many than each control, have more 462.4% than compareing B, control C, control D2 respectively,
19.56%th, 63.11%.Advantage as cultivation matrix, and the feasibility that replace soil are substantially shown.
In a word, the compound thing after the application freeze thawing is used as substrate, all shows from the point of view of the emerging and grow of Melilotus officinalis
Advantage is gone out, the method can be used as a kind of city domestic sewage treatment plant dewatered sludge processing method and the profit of plant cultivation media
Use technology.
Basic physical and chemical before and after 4 the application substrate of table and dewatered sludge, soil freezing-thawing
Table 4 be compound thing in substrate of the present invention before and after freeze thawing and as the direct freeze thawing of dewatered sludge for compareing before
Afterwards with soil freezing-thawing before and after physicochemical property parameter.In order to further illustrate the phenomenon in table 3, the present invention is analyzed by table 4
Feasibility of the substrate as cultivation matrix.
As can be seen from Table 4：After freeze thawing, the water content of each test matrix is all decreased obviously, and before freeze thawing, water content is most
After high dewatered sludge freeze thawing, moisture content also reaches《Urban wastewater treatment firm sludge treatment betterment of land shale》(GB/T
24600 2009) in standard<65% requirement.
Find out that by table 4 pH value 7.96 of substrate A2 of the present invention is increased slightly than the pH 7.48 of A1 before freeze thawing, increased
o.48；PH value 7.27 before control B1 dewatered sludge freeze thawing, is declined slightly after B2 dewatered sludge freeze thawing, and pH value 7.09 is reduced
0.18；After pH value 8.36, freeze thawing before control D1 soil freezing-thawings, D2 is declined slightly pH value 7.20, reduces 1.6；Substrate of the present invention
The pH value of A2 compared with 2 controls increased 0.48, be increased slightly.PH value is according to relevant standard[3]I.e.：During pH6.5～7.5 are
Property, pH7.5～8.5 are alkalescence, and pH ＞ 8.5 are divided for strong basicity, the pH value 7.96 of substrate of the present invention, belong to alkalescence, and right
Alkalescence, but pH value few 0.4 are belonged to according to 8.36 of pH before D1 soil freezing-thawings；Compared with control D2 soil cultivations substrate pH 7.20,
Many 0.76." most of soils pH is 4～9, can maintain all kinds of growth of microorganism to develop ", also, the purpose of substrate of the present invention is
For mine reclamation and ecological recovery, the plant that is planted is typically all to fit natural disposition by force and biennial above plant, with plant
The growth of thing, is affected by root system of plant, and the pH of substrate can decline, and plant being capable of normal growth.The present inventor's test proof, this
Substrate disclosure satisfy that normally emerging and growing for Melilotus officinalis.
As seen from Table 4, the compound thing A1 in conductivity value substrate of the present invention and control dewatered sludge B1, after freeze-thaw A2,
B2 is significantly increased, and after control soil D1 freeze thawing, electrical conductivity has declined.Soil conductivity is the finger for reflecting Water-soluble salts
Mark, and Water-soluble salts are important attributes of soil, are to judge whether salt ion limits plant growth in soil
Factor.In the range of finite concentration, soil liquid salinity is proportionate with electrical conductivity.Due to actually hyposaline agricultural land soil
Electrical conductivity is generally less than 1mS/cm, when being more than 4mS/cm by the settled soil conductivity of United States Department of Agriculture's standard gauge, as high saliferous
Soil[5].The electrical conductivity of substrate of the present invention is 601.5us/cm, belongs to normal range, selects suitable raw plant in addition, can make
Which is normal and grows vigorously, and result of the test indicates this point.
Substrate field capacity, is to weigh the important indicator that substrate keeps moisture ability.Table 4 shows, substrate A2 of the present invention
Field capacity be 35%, differ only 4% with control soil D239%, and the sludge B2 field capacitys of direct freeze thawing is
29%.Substrate of the present invention is the substrate for preparing, and soil is soil moved in improve the original, is all comparable to the farmland top layer that has just turned over, and this numerical value is omited
The field capacity of general soil is exceeded.Illustrate that substrate of the present invention has the water retention property equivalent to loam.
As seen from Table 4, the unit weight of substrate of the present invention is 0.96g/cm3, the unit weight for compareing soil is 0.98g/cm3, differ nothing
Several.Because substrate A2 of the present invention and control soil D2 are comparable to the farmland top layer that has just turned over, both value of bulk density are all just
Constant value scope[7].Illustrate substrate of the present invention from for unit weight equivalent to soil.
As seen from Table 4, the porosity of substrate A2 of the present invention is 64%, and the porosity for compareing soil D2 is 63%, Liang Zhexiang
Difference is very few.Because substrate of the present invention and control soil are all comparable to the farmland top layer that has just turned over, both porosity values all exist
Range of normal value.Illustrate substrate of the present invention from for porosity equivalent to soil.
Water capacity, unit weight and total porosity be characterize Soil structure important physical index, to the soil water, fertilizer, gas,
The regulation of heat etc. and soil physics, chemistry and bioprocess etc. have influence.Substrate of the present invention is found out from analysis above
This several indexs possess the condition of plant growing in terms of water capacity, unit weight and total porosity equivalent to control soil.
As seen from Table 4, from the point of view of the loss amount before the content of organic matter is after the freeze thawing than freeze thawing, substrate A2 of the present invention have lost
5.24%, than freeze thawing before (27.38%) reduce 19.14%, dewatered sludge B2 have lost 49.92%, than freeze thawing before
(65.85%) reduce 75.81%, soil D2 have lost 1.07%, than freeze thawing before (3.04%) reduce 35.20%, analysis
Show, the percentage ratio that substrate loss amount of the present invention accounts for the content of organic matter before freeze thawing is minimum, i.e., by the organic matter loss amount of freeze thawing
Minimum.From the point of view of the content of organic matter after the freeze thawing as cultivation matrix, substrate A2 of the present invention is than other two kinds control dewatered sludges
Organic matter 15.93% and 1.97% after B2 and soil D2 freeze thawing is higher by 6.21% and 20.17% respectively, it is clear that apparently higher than soil
Earth.Substrate A2 organic matter of the present invention reaches 22.14%, equivalent to farmland organic soil.
From the point of view of table 4, nutrient content after the freeze thawing than freeze thawing before from the point of view of decrement, total nitrogen content substrate A2 of the present invention is reduced
38.28%, dewatered sludge B2 have lost 95.04%, and soil D2 have lost 31.38%, substrate loss amount of the present invention with compare soil
Earth is very nearly the same, can effectively reduce the loss of full nitrogen compared with dewatered sludge B2.
Phosphorus amount substrate A2 of the present invention reduces 25.45% entirely, and dewatered sludge B2 reduces 92.43%, and soil D2 increased
170.73%, although the ratio that substrate of the present invention is reduced cannot be compared with the ratio that control soil increases, from as cultivation base
From the point of view of the content of tatal phosphorus of matter, the content of tatal phosphorus of substrate of the present invention is 1.23g/kg, more slightly higher than the 1.11g/kg of control soil, quite
In soil.
Potassium amount substrate A2 of the present invention reduces 3.82% entirely, and dewatered sludge B2 reduces 39.18%, and soil D2 is reduced
66.81%.The amount that substrate of the present invention is reduced is minimum.And from the point of view of the full potassium content as cultivation matrix, substrate A2 of the present invention
Content of tatal phosphorus be 6.79g/kg, than compare soil D2 3.89g/kg slightly higher, better than soil.
Find out from above analysis, the full potassium content of nutrient total nitrogen and total phosphor phosphorus substrate of the present invention is conducive to plant better than soil
Growth, this is consistent with the result of table 3 (emerging and growing state table).
Content of beary metal and biological indicator before and after the application substrate of table 5 and dewatered sludge and soil freezing-thawing
6 evaluation criterion of table
Table 5 is the application sludge compound thing and dewatered sludge and the content of beary metal before and after soil freezing-thawing and refers to biology
Mark.Table 6 is evaluation criterion.In order to further evaluate the environmental safety of substrate of the present invention, it is analyzed by table 5.Can see
Go out：In table, listed content of beary metal is no more than《Standard of soil environment quality》(GB15618-19950) secondary standard and
《Urban wastewater treatment firm Treatment of Sludge betterment of land shale》(GB/T24600-2009) standard.Even most heavy metals
Content exists《Standard of soil environment quality》(GB15618-19950) in primary standard.
The content of beary metal of the wherein compound thing of application substrate should be corresponded to《Standard of soil environment quality》(GB15618-
1995) grade III Standard in, but compare with primary standard, it is less than primary standard.It can be seen that, come from the angle of content of beary metal
See, apply for that the environmental risk in terms of substrate heavy metal pollution can be avoided.
Analyze from biological indicator, in table 5, listed every total number of bacteria is not exceeded；The dehydration of excrement colibacillus group value is dirty
Not up to standard before and after mud freeze thawing, and the compound thing that applies has reached standard after freeze thawing；Roundworm egg is not detected, but from convention
Upper analysis, if there are roundworm egg, also ratio can be reduced greatly through freezing.Above analysis show that the method for application substrate is being prevented
There is obvious advantage in terms of pathogen contamination.
Meanwhile, the present inventor it has been investigated that, with the inventive method process sludge obtained by compound thing, as Hemerocallis citrina Baroni
The substrate of Melilotus suaveolens Ledeb. cultivation, effect are projected, and emergence rate can reach 71.55%, and gained Melilotus officinalis are more healthy and strong, are trained within 65 days
After supporting, up to 38.3cm, maximum plant height reaches 41.3cm to average plant height.
The physico property analysis of the inventive method compound：Through the sludge compound thing of winter low temperature freeze thawing, basic physics and chemistry
Matter：Moisture content, pH value, organic matter, N, P, K, total number of bacteria, coliform, roundworm egg number, content of beary metal etc. meet《City
Town sludge of sewage treatment plant disposes betterment of land shale》(GB/T24600-2009)、《Standard of soil environment quality》
Etc. (GB15618-1995) standard is required；Field capacity, unit weight, porosity, electrical conductivity etc. are close with soil or are permitting
Perhaps in the range of.
Specific embodiment
Hereinafter the preferred embodiments of the present invention are illustrated, it will be appreciated that preferred embodiment described herein is only used
In the description and interpretation present invention, it is not intended to limit the present invention.
Embodiment 1：
The present embodiment is by taking Datong Mine Area as an example.
Datong Mine Area is located at Datong District southwest, and away from urban district 12.5km, area under one's jurisdiction is intersected with Datong Southern Suburb, and the gross area is about
90km2, it is known as hundred li of mining areas.Datong Mine Area has size hillock and disposal site 61, affiliated mine to add up discharge coal over the years
Nearly hundred million tons of spoil, floor space 270hm2.With the production-scale continuous expansion in mining area and the raising of raw coal cleaning percent, mining area
Gangue will be exerted heavy pressures on to Datong Mine Area environment in the accelerated growth stage in the coming years.And the flyash that arranges outward
Also increase year by year, at the same time, mining area has substantial amounts of sludge to produce every year, only Datong Coal Group Company sewage treatment plants (1 factory)
Start to produce dewatered sludge daily up to 30t or so early summer in 2013, the process of sludge has become a great problem with disposing.This
The place of banking up of a little solid waste is increasingly in short supply, and the environmental problem that brings, such as reentrainment of dust, subsoil water are on the hazard, vegetation
Destruction, land occupation etc. are more highlighted.For mining area hillock and discarded ground soil itself retentiveness be poor, physicochemical property extremely,
The low feature of fertility, plant are difficult to grow, and banketing to reclaim needs soil moved in improve the original, and soil resource is deficient, using Treatment of Sludge side of the present invention
Method improves reclaimation measures, promotes plant growing.Concrete method for sludge treatment is as follows：
Datong Coal Group Company Tashan Mountain Gangue Hill is selected as place is processed, using freeze thawing treatment method, in winter, will be aqueous
Rate 80% ± 2% dewatered sludge, flyash and gangue press 3:1:After 6 volume ratio mixing, it is stacked on ground, thickness
In 30 ± 5cm, using the temperature that winter is below freezing, freeze compound thing, before treating spring plantation, when temperature gets warm again after a cold spell, freezing
Compound thing melt, you can.
The present invention not only effectively improves the problem of Datong Mine Area soil depletion, discarded with mining city surrounding solid
Thing, improves local degraded land, controls " moving back " with two-way environmental benefit with " giving up ", and fast growing, with huge economy
Benefit and environmental benefit.
Embodiment 2：
The sludge compound thing after above-mentioned process is utilized to be used for the cultural method of Melilotus officinalis as substrate, including following step
Suddenly：
1) substrate prepares：It is (suitable for reading straight that the compound thing that freeze thawing is blended with dewatered sludge, flyash and gangue is loaded flowerpot
Footpath 17cm, lower port diameter 14cm, high 18cm) in；
2) sow：The Melilotus officinalis seed for processing is sprinkling upon in substrate, same substrate 1cm～2cm is covered above thick；
3) daily management：Vegetation period, the water regime according to substrate water, to ensure the need of Melilotus officinalis growth
Will, Growth of Alfalfa to 60～70 days is harvested.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, although with reference to aforementioned reality
Apply example to be described in detail the present invention, for a person skilled in the art, which still can be to aforementioned each enforcement
Technical scheme described in example is modified, or carries out equivalent to which part technical characteristic.All essences in the present invention
Within god and principle, any modification, equivalent substitution and improvements that is made etc. should be included within the scope of the present invention.
Claims (5)
1. a kind of dehydrated sludge of domestic sewage treatment plant freeze thawing treatment method, it is characterised in that：By moisture content 80% ± 2% de-
Sewage sludge, flyash and gangue press 2.5-4:1-2:After the volume ratio mixing of 5-7, be stacked on ground, thickness 30 ±
5cm, using the temperature that night in winter is below freezing, freezes compound thing, before treating spring plantation, when temperature gets warm again after a cold spell, freezing
Compound thing melts, you can.
2. dehydrated sludge of domestic sewage treatment plant freeze thawing treatment method according to claim 1, it is characterised in that：Mixed material
3 are pressed by dewatered sludge, flyash and gangue:1:6 volume ratio composition.
3. a kind of cultural method of Melilotus officinalis, it is characterised in that：The compound obtained using processing method described in claim 1
Cultivation matrix of the thing directly as Melilotus officinalis.
4. the cultural method of Melilotus officinalis according to claim 3, it is characterised in that：Comprise the steps：
1）Substrate prepares：The compound thing for blending freeze thawing with dewatered sludge, flyash and gangue is loaded in flowerpot；
2）Sowing：The Melilotus officinalis seed for processing is sprinkling upon in substrate, same substrate 1cm～2cm is covered above thick；
3）Daily management：Vegetation period, the water regime according to substrate water, to ensure the needs of Melilotus officinalis growth,
Melilotus officinalis grow into 60～70 days results.
5. the cultural method of Melilotus officinalis according to claim 4, it is characterised in that：The step 1）In flowerpot on
The a diameter of 17cm of mouth, lower port diameter 14cm, high 18cm.
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| CN201510035346.XA CN104743766B (en) | 2015-01-23 | 2015-01-23 | A kind of dehydrated sludge of domestic sewage treatment plant freeze thawing treatment method and the purposes of gained sludge compound thing |
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| CN110606636A (en) * | 2019-10-24 | 2019-12-24 | 许宝庆 | Natural land utilization treatment method for town dewatered sludge |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101920261A (en) * | 2010-05-13 | 2010-12-22 | 中国矿业大学 | Coal gangue-fly ash-sludge substrate and mycorrhiza technology for restoring ecology of mining area |
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| JPS56121700A (en) * | 1980-02-27 | 1981-09-24 | Mitsubishi Electric Corp | Disposal of raw night soil and septic tank sludge |
| JP2007014927A (en) * | 2005-07-11 | 2007-01-25 | Takuma Co Ltd | Mud treatment method |
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