CN107601705B - The method and recovered liquid of suspended matter and toxic heavy metal and the application of recovered liquid in a kind of combination stalk method removal biogas slurry - Google Patents
The method and recovered liquid of suspended matter and toxic heavy metal and the application of recovered liquid in a kind of combination stalk method removal biogas slurry Download PDFInfo
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Abstract
The invention belongs to water-treatment technology fields, and in particular to the method and recovered liquid of suspended matter and toxic heavy metal and the application of recovered liquid in a kind of combination stalk method removal biogas slurry.The method comprising the steps of: 1) filtering biogas slurry through Non-woven fabrics filter；2) calcium oxide or calcium hydroxide is added, adjusts pH to 10.5~11, adds precipitating desired amount of TMT-15 and ferrous sulfate completely, is stirred to react 30~60min, removes heavy metal；3) precipitating is added and the desired amount of ferric chloride solution completely that flocculates, is stood after stirring, it is complete precipitates residual TMT-15 and flocculation purification completely；4) supernatant is filtered through Non-woven fabrics filter；5) biogas slurry is subjected to stalk absorption；6) biogas slurry is filtered through Non-woven fabrics filter, is separated by solid-liquid separation, obtains clear liquid；7) dust technology is added to clear liquid, adjusting pH value is 7~8, obtains recovered liquid.This method can effectively remove the suspended matter and heavy metal in the more complex biogas slurry of ingredient, and the recovered liquid obtained after handling can recycle.
Description
Technical field
The invention belongs to water-treatment technology fields, and in particular to suspended matter and toxic in a kind of combination stalk method removal biogas slurry
The method and recovered liquid of heavy metal and the application of recovered liquid.
Background technique
With the fast development of large-scale plant that raises, only just there are about 2,000,000 tons of biogas slurries to generate every year Chinese.On a large scale
Do not have enough soil spaces around farm usually to digest biogas slurry.Traditional wastewater treatment method since cost is very high and
The nutrition composition wasted in biogas slurry is not appropriate for for handling biogas slurry.The Utilizing question of a large amount of biogas slurries is solved to extensive agricultural
It is of great significance with marsh gas power generation.
Although it is the processing cost-effective measure of pig farm biogas slurry that biogas slurry is agricultural, man-made feeds and additive use so that
Large-scale pig farm biogas slurry contains various heavy.
Heavy metal distribution characteristic in the biogas slurry of Pig dung and urine source is studied by China, State of Zhao et al., the results showed that, contain in biogas slurry
In a large amount of Fe, Cu, Zn etc., micronutrient element, while also containing toxic heavy metal elements such as a certain amount of As, Ni, Pb, Cd；
The content sequence of surveyed essential metal element is Fe > Zn > Cu > Mn, nonessential heavy metal constituent content sequence be As > Ni > Pb >
Cd, wherein three kinds of elements are below " organic fertilizer professional standard " (NY 525-2012), As is far super " agricultural irrigation water quality standard "
(GB 5084-2005)。
Nie Ying et al. to using pig manure as the biogas slurry constituent analysis of raw material after obtain, in the biogas slurry of pig farm containing Hg, Cd, As, Pb,
The heavy metal elements such as Cr, content are generally lower than the standard limited value of " the agricultural control standard of townm refuse " in China.
Research of the Wei Shiqing et al. to physicochemical property and content of beary metal mutation analysis Wei before and after piggery waste anaerobic fermentation
Show that the content of beary metal in fermentation biogas slurry is significantly lower than the content in waste, content of beary metal difference in different month biogas slurries
It is larger；" agricultural irrigation water quality standard " (GB 5084-2005) the heavy metal limit standard of comparison, Hg, Zn, Cu are super in August biogas slurry
Mark, June and August biogas slurry As content are exceeded, and Cd, Cr, Pb content is within the allowable range in biogas slurry.
As can be seen that the ingredient in biogas slurry is complex, and can change significantly at any time.Therefore, the prior art
In, it temporarily has no to the simple and effective processing method of biogas slurry.
Summary of the invention
To solve the deficiencies in the prior art, the present invention provides suspended matters and toxic in a kind of combination stalk method removal biogas slurry
The method and recovered liquid of heavy metal and the application of recovered liquid.Method provided by the present invention is more complex effectively to remove ingredient
Suspended matter and heavy metal in biogas slurry, and the recovered liquid obtained after handling can recycle.
Technical solution provided by the present invention is as follows:
A method of suspended matter and toxic heavy metal in combination stalk method removal biogas slurry, comprising the following steps:
1) biogas slurry is filtered through Non-woven fabrics filter, removes oil removal；
2) calcium oxide or calcium hydroxide is added into the biogas slurry obtained by step 1) processing, adjusts pH to 10.5~11,
Precipitating desired amount of TMT-15 and ferrous sulfate completely are added, 30~60min is stirred to react, precipitating completely, removes a huge sum of money
Belong to；
3) precipitating is added into the biogas slurry obtained by step 2) processing and the desired amount of ferric chloride solution completely that flocculates,
It is stood after stirring, it is complete to precipitate residual TMT-15 and flocculation purification completely；
4) supernatant of the biogas slurry obtained by step 3) processing is filtered through Non-woven fabrics filter, is separated by solid-liquid separation；
5) biogas slurry obtained by step 4) processing is subjected to stalk absorption；
6) biogas slurry obtained by step 5) processing is filtered through Non-woven fabrics filter, is separated by solid-liquid separation, obtains clear liquid.
The method of suspended matter and toxic heavy metal is by straw in combination stalk method removal biogas slurry provided by above-mentioned technical proposal
Stalk method, chemical method and physical method are used in combination, in which:
Chemical precipitation mechanism:
1) to the cutting mechanisms of arsenic in biogas slurry: molysite (FeSO being added in waste water4) and white lime, Fe2+It is oxidized to Fe3+,
As3+It is oxidized to As5+, generate FeAsO4Precipitating, solubility are smaller.In addition, Fe3+Hydrolysate Fe (OH)3It is effective
Adsorbent, to FeAsO4、Ca3(AsO4)2Particle plays the role of absorption, cohesion.Specific chemical equation is as follows:
4Fe2++O2=2H3O=4Fe3++4OH-
2AsO2 -+O2+4OH-=2ASO43-+2H2O
3Ca2++2AsO43-=Ca3(AsO4)2↓
Fe3++AsO4 3-=FeAsO4↓
2) to the copper of complex state in biogas slurry and ionic state, zinc, nickel, lead, chromium, cadmium, the cutting mechanisms of mercury: anti-with TMT-15
Precipitating should be generated to remove through filtering.The effect of ferrous sulfate is first is that reduction of hexavalent chromium is trivalent chromium, second is that playing bridging.Add
Chlorination ferric flocculant, second is that remaining TMT-15 reaction is generated sediment and is removed, is accomplished in biogas slurry first is that playing flocculation
In do not remain TMT-15.
About heavy metal chelating agent TMT-15: organic sulfur TMT-15, alias 1,3,5-triazines -2,4, tri- mercaptan trisodium of 6-
Salt, 2,4,6- trithio sodium alcoholates are thio -1,3,5-triazines, tri-thiol-S- triazine trisodium salt, colourless to slightly weak yellow liquid,
Molecular formula C3N3S3Na3.For monovalent in all kinds of waste water, divalent heavy metal precipitation, especially suitable for processing Hg, Cu, Cd, Ag,
Pb,Ni,Sn,Zn,Mn,Cr.TMT-15 product is that one kind effectively removes various heavy metal in waste water, environmentally friendly, non-toxic
Heavy metals removal agent.
TMT-15 (15% aqueous solution) is a kind of important heavy mental treatment agent, can be with most of one in aqueous solution
The heavy metal ion of valence and divalent, such as Fe2 ﹢/Fe3 ﹢, Ni2 ﹢, Pb2+, Cu2 ﹢, Ag﹢, Zn2 ﹢, Cd2 ﹢, Hg2 ﹢, Ti2 ﹢And Cr3 ﹢Deng from
Son forms stable compound and is precipitated out, to achieve the purpose that heavy-metal ion removal.
For TMT-15 compared with vulcanized sodium, vulcanized sodium is reacted with heavy metal ion cannot form chelate, can be only formed small point
Inorganic sediment --- the sulfide of son, the stability of sediment are far smaller than the stability for generating chelate precipitating.And
Suspension colloid easy to form, it is not easily settled.And the macromolecular solid chelate hard to tolerate that TMT-15 is generated, precipitated product property are steady
Fixed, easily settled, in the case where high temperature or strong current scour, vulcanization reaction is still complete, and precipitated product property is stablized, and easily divides
From.
The coordination ability of DTC is stronger, it can be by a nitrogen-atoms a, sulphur atom, totally two coordination atoms and a huge sum of money
Belong to ions binding, forms the stable chelate with a four atom rings.Compared to DTC, the coordination ability of TMT-15 is powerful,
It can be by three nitrogen-atoms, three sulphur atoms, and totally six coordination atoms are formed in conjunction with heavy metal ion stable has six
The chelate of a four atoms ring.What DCT was formed is chelate ratio TMT-15 two less of four atom rings, four atom rings.With from
Conversion between son is carried out to the more stable complex ion direction of generation, and thus: TMT-15 has in stronger removing waste water
Complexing, the ability for chelating heavy metal substance.
In step 2) and step 3), precipitating dosage can be determined by routine experiment method, for example, to the biogas slurry of experimental measuring
It takes and operates Approach by inchmeal several times with precipitating with agent on a small quantity, until no longer generating precipitating or flocculate, the precipitating of record experiment is used
Summation is measured, then equal than amplifying.
In step 2):
The heavy metal of removing includes any one or more in copper, zinc, nickel, lead, chromium, cadmium, arsenic or mercury；
Filter residue can fill up processing in household garbage field.
The method of suspended matter and toxic heavy metal is by straw in combination stalk method removal biogas slurry provided by above-mentioned technical proposal
Stalk method, chemical method and physical method are used in combination, and can achieve the copper effectively removed in biogas slurry, zinc, nickel, lead, chromium, cadmium, arsenic,
Mercury reaches the pretreated purpose of innoxious biogas slurry.The technical solution further makes on the basis of chemical method and physical method
With stalk method, the removal effect of suspended matter and toxic heavy metal can be further increased, reduces the usage amount of chemical agent, and will not
Introduce the impurity for needing to remove.
Further, the method for suspended matter and toxic heavy metal further includes step 7) in combination stalk method removal biogas slurry: to
Obtained clear liquid being handled by step 6), dust technology being added, adjusting pH value is 7~8, obtains recovered liquid.
Through the above technical solutions, soilless culture nutrient fluid can will be adjusted to except clear liquid.
Specifically, first stirring 3~5min, then the 1.5~2.5min of stirring that slows down in step 3).First stirred with fast speed
3~5min is mixed, then 3~5min is stirred with slower speed.
Specifically, the grain diameter of stalk is less than or equal to 20 mesh in step 5)；The dosage of stalk and the bulking value of biogas slurry
Than for 0.5~10g/L；The temperature of stalk processing is 5~60 DEG C.
Specifically, the Non-woven fabrics filter includes at least two filter elements being set side by side, the filtering is single
Member includes the rectangle frame body being made of four straight tubes and four two-ways, and the rectangle frame body erects setting, in each straight tube
It is provided with several inlet openings on inner sidewall, nonwoven layer is wrapped in the rectangle frame body, on the rectangle frame body
It is provided with the water outlet of an opening upwards on the straight tube of side, one is provided on the straight tube of rectangle frame body lower part and is opened
The downward water outlet of mouth, the water outlet pass through non-woven fabrics, straight tube and the rectangle frame body above the rectangle frame body
The straight tube of lower part includes left half section and half section of the right side, and described left half section is connected to described right half section by threeway, the threeway
Third mouth forms water outlet.
Further, the water outlet of the lower part of each filter element is separately connected outfall sewer, and the outfall sewer is connected with
Pump.
In above-mentioned technical proposal, straight tube and connector can be selected from various waterproof materials, such as PVC etc.；Non-woven fabrics has a variety of
Aperture can be selected according to waste water quality；Non-woven fabrics filter provided by above-mentioned technical proposal can turn upside down use,
To turn upside down after lower part outlet blocking, to quickly replace；The filtering dress of non-woven fabrics provided by above-mentioned technical proposal
The system being made of filter element can be formed by setting, and both can be individually discharged with each unit, and collection can also be collected by outfall sewer
Middle water outlet.
Non-woven fabrics filter is using non-woven fabrics as filtering material, and material environmental protection, degradable, filter device filter effect is good,
There is non-woven fabrics multiple aperture can be selected according to waste water quality, versatile, can be applied to the water process of a variety of sewage.
The present invention also provides what is obtained according to the method for suspended matter and toxic heavy metal in combination stalk method removal biogas slurry
Recovered liquid.
Recovered liquid is overregulated, and can be used as soilless culture nutrient fluid.
The present invention also provides the applications of recovered liquid, as soilless culture nutrient fluid.
Preferably, as greenhouse soilless culture nutrient fluid.
Advantages of the present invention:
1) Non-woven fabrics filter operation is more convenient, when using a period of time, when needing replacing non-woven fabrics, can also carry out
Replace non-woven fabrics.And filler filtration method filtration time one is long, there are blockage problem, the workload for replacing filler is very big, and SS with
Filler mixes, and increases the difficulty of subsequent processing and transport；
2) calcium oxide or calcium hydroxide is added to adjust pH, cost reduces.And provide the calcium ion that precipitating is reacted with arsenic.Together
When can kill worm's ovum in biogas slurry, play the role of disinfection.
3) sediment is formed by after TMT-15 is handled to be dissolved by substances such as rainwater, and there is no secondary pollutions to ask
Topic.It has the following characteristics that
4) it selects TMT-15 as precipitating reagent, has the advantage that
A, highly-safe.TMT-15 (15% aqueous solution) nontoxic, environmental sound, no bad smell, precipitate metal when not
Noxious material can be generated；
B, removal effect is good.TMT-15 (15% aqueous solution) effectively, can be used for handling acidity in extensive pH value range
Waste water and alkaline waste water, no matter heavy metal ions in wastewater concentration level, is attained by removal effect.When various metals ion is total
When depositing, it can also remove simultaneously；In the presence of heavy metal ion is to be complexed salt form (EDTA, tetramine etc.), hydroxide cannot be used
When precipitation method removal is complete, TMT-15 (15% aqueous solution) can play good removal effect.TMT-15 (15% aqueous solution) In
It is not influenced by salt coexists in waste liquid when precipitation of heavy metals；
C, flocculating effect is good.Metal precipitates are thick wadding body, and sedimentation quickly, is easy to be separated by solid-liquid separation；
D, precipitate stable.Metal precipitates are very stable, even if heavy metal will not be released 200-250 DEG C of high temperature,
Metal precipitates are not oozed out in dilute acid soln, without secondary pollution, make safety when clay treatment；
E, processing method is simple, and sludge dewatering is easy；
F, there is selectivity: Hg2+> Ag+> Cd2+> Cu2+> Pb2+> Zn2+> Ni2+> Cr3+> Fe2+> Mn2+> Fe3 +；
5) iron chloride is added after chemical precipitation, first is that can be by remaining TMT-15 reaction generation precipitating and from liquid
Removal, accomplishes not introduce new chemical substance；Second is that playing coagulation, accelerate the separating rate improvement effect of solid-liquid；
6) after stalk method being introduced into chemical precipitation, that is, reduce the demand to chemical method, and can further remove suspension
Object and toxic heavy metal.Meanwhile the method will not be re-introduced into the impurity for needing to remove, and can supplement to chemical method.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the filter element of the Non-woven fabrics filter utilized in method provided by the present invention.
Fig. 2 is the structural schematic diagram of the Non-woven fabrics filter utilized in method provided by the present invention.
Fig. 3 is the flow chart of method provided by the present invention.
In attached drawing, structure list representated by each label is as follows:
1, straight tube, 2, two-way, 3, inlet opening, 4, nonwoven layer, 5, threeway.
Specific embodiment
The principles and features of the present invention are described below, and illustrated embodiment is served only for explaining the present invention, is not intended to
It limits the scope of the invention.
Specific embodiment
As shown in Figure 1, filter element includes the rectangle frame body being made of four straight tubes 1 and four two-ways 2, rectangle frame
Body erects setting, and several inlet openings 3 are provided on the inner sidewall of each straight tube 1, are wrapped with nonwoven layer in rectangle frame body
4, the water outlet of an opening upwards, the straight tube 1 in rectangle frame body lower part are provided on the straight tube 1 above rectangle frame body
On be provided with the water outlet that Open Side Down, water outlet passes through non-woven fabrics.Wherein, the straight tube 1 above rectangle frame body and length
The straight tube 1 of square rack lower part includes left half section and half section right, and left half section and right half section passes through threeway 5 and be connected to, and the of threeway 5
Three mouths form water outlet.
As shown in Fig. 2, Non-woven fabrics filter includes filter element provided by three Fig. 1 being set side by side, it is each to filter
The water outlet of the lower part of unit is separately connected outfall sewer；Outfall sewer is connected with pump.Non-woven fabrics filter is set to mud
In bucket, water (flow) direction is illustrated with arrow, water flow all directions on the outside of Non-woven fabrics filter are flowed through non-woven fabrics from inlet opening 3
Enter into Non-woven fabrics filter, then enters outfall sewer process via water outlet.During water flow penetrates non-woven fabrics, nothing
Woven fabric intercepts suspended matter, and sludge is attached on non-woven fabrics or sinks to bucket.Non-woven fabrics filter is vibrated, it will
Sludge is removed from nonwoven surface.The Non-woven fabrics filter can form the system being made of filter element, both can each list
First individually water outlet, can also collect concentration water outlet by outfall sewer.Also, since each filter element top and the bottom even have out
Filter element is turned upside down quickly to be replaced when use by the mouth of a river in the blocking of lower part water outlet.
Embodiment 1
Absorption of the stalk to heavy metal
Biogas slurry used in this experiment comes from Wuhan periphery pig farm.
Test equipment: thunder magnetic board multiparameter water quality analyzer；Constant temperature magnetic heating stirrer；The desk-top pH meter of thunder magnetic.
Experimental method
1) it is put into baking oven after rice straw surface dirt is eluted with water, 60 DEG C are dried 24 hours.The stalk of drying is cut into 1~
2cm segment, then crushed with pulverizer, it is sieved.The stalk for respectively obtaining 20,40,60,80 mesh is placed in sealed glass jars preservation.
2) preparation of standard reagent.Plumbi nitras 21.5985g is accurately weighed, is dissolved in 1L ultrapure water, is configured to containing lead ion
The mother liquor 1L of 1000mg/L, be sealed with plastic bottle it is spare, take out when use be diluted to various concentration gradient lead standard it is molten
Liquid or test sample.Accurately weigh copper nitrate (molecular formula Cu (NO3)2·3H2O) 3.8020g is dissolved in 1L ultrapure water, configuration
The copper ion mother liquor 1L of 1000mg/L, is sealed with plastic bottle, and the copper standard for being diluted to various concentration gradient is taken out when use
Solution or test sample.
3) autogamy cupric or leaded water sample, by single factor experiment, measure stalk powder in autogamy sample copper, lead and
The removal effect of arsenic optimizes adsorption conditions.
4) removal effect of the measurement stalk powder to copper, lead and arsenic in biogas slurry.
The measuring method of this experiment copper and lead is electrode method, and cupric ion electrode (PCu1-01) measurement range is 10-1~5 ×
10-7, lead ion electrode PPb1-01 measurement range is.The measuring method of arsenic is atomic fluorescence method.
Experimental result
The single factor experiment of stalk absorption heavy metal copper
1) influence of the stalk dosage to copper ion removal effect
Copper ion mother liquor is diluted with ultrapure water, is configured to the copper ion water sample to be tried of 5mg/L or so.Take the modeling of 100mL
10, beaker, material, is respectively added the rice straw (60 mesh) of different quality, with mistake after magnetic stirrer 30min in beaker
Filter.Measure the content of copper ion in filtrate.Every kind of dosage does Duplicate Samples two, and residual measures mean value, calculates removal rate value and is shown in Table
1.
The removal rate of table 1. stalk dosage and copper
2) influence of the stalk partial size to copper ion removal effect
Copper ion mother liquor is diluted with ultrapure water, is configured to the copper ion water sample to be tried of 5.929mg/L.Take the modeling of 100mL
10, beaker, material, number 1-10#, respectively it is added 20 mesh of 0.5g in beaker, 40 mesh, 60 mesh, the stalk of 80 mesh stirs with magnetic force
It is filtered after mixing device stirring 30min.Measure the content of copper ion in filtrate.It calculates removal rate and is shown in Table 2.
The removal rate relationship (initial concentration 5.929mg/L) of table 2. stalk partial size and copper
By table as it can be seen that stalk mesh number is bigger, partial size is smaller, and specific surface area is bigger, stronger to the adsorption capacity of copper, removal rate
It is higher.
3) influence of the temperature to stalk absorbing copper effect
Add 0.5g stalk in the copper solution that 100mL initial concentration is 5.634mg/L, respectively at 25 DEG C, 38 DEG C, 50 DEG C add
Thermal agitation 30min, is filtered with filter paper, measures remaining copper in filtrate, and each temperature does two in parallel, and results are averaged, is shown in Table
3。
3. temperature of table influences initial concentration (21.634mg/L) to the removal rate of copper in stalk
Known by table 3, temperature increases, and stalk has increase trend to the removal rate of copper.
The single factor experiment of stalk absorption heavy metal lead
1) removal effect of stalk dosage and lead ion
Lead ion sample is prepared with ultrapure water, initial concentration 4.802mg/L, respectively plus 1,2,3,4,5,6,7,8g stalk
Into 100mL sample.Dosage and removal rate relationship are as shown in table 4:
The removal effect (initial concentration 4.802mg/L) of table 4. stalk dosage and lead ion
2) influence of the pH to stalk Adsorption of Lead effect
Lead nitrate solution is prepared, the pH=5.35 of lead ion solution is measured.Hydrochloric acid solution and sodium hydroxide solution tune is added
Saving pH is respectively 3.50,4.14,4.90,5.44, and respectively plus pH value and filter in filtrate are surveyed in stalk 5g/L, stirring 30min, filtering
The concentration of lead in liquid, the results are shown in Table 5.
Lead removal efficiency of the table 5. containing lead solution at different pH
Known by table 5, for pH in the range of 3.5-5.44, pH value has no significant effect lead removal rate.In aqueous solution plus
Enter rice straw, the pH of solution system can be made to become alkalescent from acidity.
Embodiment two
Non-woven fabrics filter is to the effect for removing SS in former biogas slurry
Removal effect (initial value 5.02) of the 6 different type non-woven fabrics of table to SS in biogas slurry
Note: PP is polypropylene fibre, and PA is polyamide fibre
Known by table 6, the high several non-woven fabrics sequence of the removal good removal rate of SS effect are as follows:
Polypropylene 220g (52.8%) > polypropylene 150g (51.8%) > PADS-N (47.4%) > polypropylene 100g
(47%)
Embodiment three: TMT-15 removes the copper and lead in biogas slurry
Biogas slurry sample source is in the medium temperature biogas project of Wuhan City Jiangxia District boar farm (delivering a number for sale is ten thousand)
The biogas slurry of output, pH value 8.73, is filtered through Non-woven fabrics filter, ss suspended solid 2.56g/L.
The biogas slurry sample 100mL several pieces of Non-woven fabrics filter of learning from else's experience filtering, are respectively put into the beaker of 100mL, add
Calcium oxide or calcium hydroxide tune pH value are 10.5-11, and the TMT-15 (100 times of dilution, 0.15%) that different volumes are added is stirred afterwards
30min, copper and lead content after adding few drops of iron chloride (1g/L) rear determination of electrode reactions, as a result such as table 7, shown in table 8.
The removal rate (sample size 100mL) of copper ion concentration in table 7.TMT-15 dosage and biogas slurry
The removal rate (sample size 1L) of plumbum ion concentration in table 8.TMT-15 dosage and biogas slurry
Example IV: removal of the TMT-15 to heavy metal ion various in biogas slurry
1L large beaker two are taken, the biogas slurry 1L filtered through Non-woven fabrics filter is respectively put into, uses calcium oxide or hydrogen in filtrate
After calcium oxide tune pH value 10.5-11,15% TMT-1530-50min of 2mL and the ferric chloride solution of 50mg/L is added
2mL, detailed step are as shown in Figure 3.Purified biogas slurry filtrate is used each with the measurement of the National Standard Methods such as atomic absorption method, atomic fluorescence method
The content of metal, is shown in Table 9.Filter residue measures moisture content, and the content of beary metal measured in its leachate after drying is shown in Table 10.
Removal rate (sample size 1L) of the table 9.TMT-15 to ion concentration each in biogas slurry
Meet fertilizer standard limit value (GB/T23349-2009) and farmland irrigation water standard (mg/L), green can be carried out
Resource utilization.
Content of beary metal in 10 filter residue leachate of table
Known by table 10, filter residue leachate meets " hazardous waste judging standard-leaching characteristic identification " (GB5085.3-1996)
Limit value is not belonging to hazardous waste, can be transported to household refuse landfill sites landfill.The last processing of measurement and the filtered SS of filter paper
Value is 0.07g/L.
Embodiment five
Effect of the iron chloride to coagulating sedimentation
Removal rate of 11 iron chloride of table to SS in the biogas slurry system after precipitation reaction
Known by table 11: after iron chloride is added, the sedimentation time reduces one of three parts, more efficiently；Compression double electric layer precipitating effect
Fruit is more preferable, and compression layer height is lower；The content of SS is also less in supernatant after stratification, increases to the removal rate of SS
5.2%.
Embodiment six
Stalk is to heavy metal copper in biogas slurry, the effect of lead and arsenic
1) removal effect of the stalk to copper in biogas slurry
Measuring biogas slurry pH value is 8.94, and acid adding adjusts biogas slurry pH value and (requires the pH of solution to exist when determination of electrode to 3.02
Between 3-6), then with the concentration of copper in the biogas slurry of determination of electrode Jiangxia.Two parts of biogas slurries are taken, respectively in biogas slurry plus after 5g/L stalk
It is filtered after stirring 30min, measures the residual concentration of copper in filtrate.
Removal effect of 12 stalk of table to copper in biogas slurry
Known by table 12, when stalk dosage is 5g/L, the copper ion that content in biogas slurry is 0.475mg/L can be removed
97.03%.
2) removal effect of the stalk to lead in biogas slurry
Removal effect of 13. stalk of table to lead in biogas slurry
Known by table 13, when stalk dosage is 5g/L, the lead ion that content in biogas slurry is 4.017mg/L can be removed
97.03%.
The straw leachate of biogas slurry is as shown in table 14 to the removal effect of each heavy metal:
Content of beary metal in 14 stalk filter residue leachate of table
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of method of suspended matter and toxic heavy metal in combination stalk method removal biogas slurry, which is characterized in that including following step
It is rapid:
1) biogas slurry is filtered through Non-woven fabrics filter, removes oil removal；
2) addition calcium oxide or calcium hydroxide into the biogas slurry obtained by step 1) processing, adjustment pH to 10.5~11, then plus
Enter and precipitate desired amount of TMT-15 and ferrous sulfate completely, be stirred to react 30~60min, precipitating completely, removes heavy metal；
3) precipitating is added into the biogas slurry obtained by step 2) processing and the desired amount of ferric chloride solution completely that flocculates, stirring
After stand, precipitate completely remaining TMT-15 and flocculation purification it is complete；
4) supernatant of the biogas slurry obtained by step 3) processing is filtered through Non-woven fabrics filter, is separated by solid-liquid separation；
5) stalk particle is added into the biogas slurry obtained by step 4) processing, carries out stalk absorption；
6) biogas slurry obtained by step 5) processing is filtered through Non-woven fabrics filter, is separated by solid-liquid separation, obtains clear liquid；
Wherein, the Non-woven fabrics filter includes at least two filter elements being set side by side, and the filter element includes
The rectangle frame body being made of four straight tubes (1) and four two-ways (2), the rectangle frame body erects setting, in each straight tube (1)
Inner sidewall on be provided with several inlet openings (3), nonwoven layer (4) are wrapped in the rectangle frame body, described rectangular
The water outlet of an opening upwards is provided on straight tube (1) above shape frame body, the straight tube (1) in rectangle frame body lower part
On be provided with the water outlet that Open Side Down, the water outlet passes through non-woven fabrics, the straight tube (1) above the rectangle frame body
Straight tube (1) with rectangle frame body lower part includes left half section and right half section, described left half section and described right half section and passes through
The third mouth of threeway (5) connection, the threeway (5) forms water outlet.
2. the method for suspended matter and toxic heavy metal, feature in combination stalk method removal biogas slurry according to claim 1
It is, further includes step 7): dust technology is added to the clear liquid obtained by step 6) processing, adjusting pH value is 7~8, is returned
Receive liquid.
3. the method for suspended matter and toxic heavy metal, feature in combination stalk method removal biogas slurry according to claim 2
It is: in step 3), first stirs 3~5min, then the 1.5~2.5min of stirring that slows down.
4. the method for suspended matter and toxic heavy metal, feature in combination stalk method removal biogas slurry according to claim 2
Be: in step 5), the partial size of stalk particle is less than or equal to 20 mesh；The dosage of stalk particle and the w/v of biogas slurry are
0.5~10g/L；Temperature when stalk adsorption treatment is 5~60 DEG C.
5. the method for suspended matter and toxic heavy metal, feature in combination stalk method removal biogas slurry according to claim 4
Be: the water outlet of the lower part of each filter element is separately connected outfall sewer, and the outfall sewer is connected with pump.
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| CN102812833A (en) * | 2012-08-09 | 2012-12-12 | 常州苏农奶牛专业合作社联社 | Technology for planning organic crop by using biogas slurry |
| JP2014015504A (en) * | 2012-07-06 | 2014-01-30 | Sumitomo Seika Chem Co Ltd | Treatment method and treatment system of biogas |
| CN104773899A (en) * | 2015-02-04 | 2015-07-15 | 优思克（北京）生物能源科技有限公司 | System for applying biogas slurry to field, and biogas slurry application method thereof |
| CN206127018U (en) * | 2016-10-20 | 2017-04-26 | 上海龙净环保科技工程有限公司 | Pretreatment systems suitable for thermal power plant's desulfurization waste water |
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| JP2014015504A (en) * | 2012-07-06 | 2014-01-30 | Sumitomo Seika Chem Co Ltd | Treatment method and treatment system of biogas |
| CN102812833A (en) * | 2012-08-09 | 2012-12-12 | 常州苏农奶牛专业合作社联社 | Technology for planning organic crop by using biogas slurry |
| CN104773899A (en) * | 2015-02-04 | 2015-07-15 | 优思克（北京）生物能源科技有限公司 | System for applying biogas slurry to field, and biogas slurry application method thereof |
| CN206127018U (en) * | 2016-10-20 | 2017-04-26 | 上海龙净环保科技工程有限公司 | Pretreatment systems suitable for thermal power plant's desulfurization waste water |
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