CN104649533A - Compound conditioning and deep dewatering method of sludge - Google Patents
Compound conditioning and deep dewatering method of sludge Download PDFInfo
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- CN104649533A CN104649533A CN201510064509.7A CN201510064509A CN104649533A CN 104649533 A CN104649533 A CN 104649533A CN 201510064509 A CN201510064509 A CN 201510064509A CN 104649533 A CN104649533 A CN 104649533A
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
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Abstract
The invention provides a sludge deep dewatering method. The sludge deep dewatering method comprises the following steps: obtaining sludge containing a free radical generating substance; adding an activator to the sludge containing the free radical generating substance for activation, thereby obtaining the activated sludge; adding industrial byproduct gypsum to the activated sludge for mixing treatment, thereby forming conditioned sludge containing a new skeleton form substance; and performing dewatering treatment on the conditioned sludge. According to the sludge deep dewatering method, zero-valent iron or nano zero-valent iron is taken as the activator to react with the free radical generating substance to generate active free radicals, and therefore, the extracellular polymeric substance of the sludge can be effectively damaged and the filtering property of the sludge can be improved on one hand, and on the other hand, ions after the activation reaction is completed are capable of directly promoting the industrial byproduct gypsum to perform a hydration reaction, and the new substance morphology of the skeleton form can be controlled; the skeleton structure is capable of remarkably increasing the porosity of the sludge, and therefore, the deep dewatering of the sludge is realized.
Description
Technical field
The invention belongs to domestic sewage sludge processing technology field, specifically a kind of mud combined cooker and deep dehydration method.
Background technology
So-called domestic sewage sludge (also referred to as municipal sludge), namely in city domestic sewage process, the general designation of all kinds of throw outs, floating matter etc. that different treatment process produces.The natural characteristics of mud causes mud granule near filtration medium, have higher solid content, because congregation forms reticulated structure between particle, thus hinders sedimentation and the compression of mud.So, chemical conditioning measure generally need be taked to improve dewatering performance of sludge, just can effectively dewater.
Sludge Chemical Conditioning method conventional at present comprises: (1) adds flocculation agent or coagulating agent, by the adsorption bridging of flocculation agent and the compression double electric layer of coagulating agent, improves the settling property of mud; (2) coagulant aids adding inertia forms hard skeleton in mud, reduces the compressibility of mud to improve the strainability of mud.But above-mentioned common Sludge Chemical Conditioning method is for the existing way DeGrain improving Bound moisture in mud.At present, after the high score flocculation agent chemical conditioning that national sewage work generally adopts, the mode of the mechanical dehydration of centrifugal or belt filter press, only can reach the effect of dehydrated sludge cake water ratio 80%.
In order to improve the conditioning effect of mud further, promote that mud flco or cell carry out cracking to discharge the Bound moisture in mud flco, prior art discloses advanced oxidation (Fenton reaction, ultrasonic wave-coupled Fenton, the lightwave CATV etc.) Sludge Chemical Conditioning based on Fenton, Fenton reaction can cause the partial oxidation of mud flco composition, thus destroy sludge flocculation and improve dewatering, but need sludge pH to be adjusted to about 3, reaction terminates rear whole sludge system in acid, easily causes secondary pollution to environment.
Before a kind for the treatment of process of municipal sludge that Chinese patent CN 102690040B announces is included in dehydrating municipal sludge, the pH of conditioning of mud is 2 ~ 4, adds catalyzer, hydrogen peroxide and persulphate, reaction >=5min between 10 ~ 100 DEG C.The method exists equally and first regulates pH to the drawback of lower value.
The conventional Sludge Chemical Conditioning technology based on Fenton advanced oxidation, and the chemical conditioning technology of persulphate advanced oxidation, although organic flocculation structure of mud effectively can be destroyed and discharge Bound moisture, but because organic content in mud is too high, in follow-up mechanical dehydration filtration procedure, due to the compressibility of mud cake, continue the passage of blocking filtered water, the effect of influence depth dehydration.Therefore, also the inorganics coagulant aids (as flyash, diatomite, lime, cement dust etc.) adding framework construction body after advanced oxidation conditioning mud is again had, inorganic coagulant aids forms hard skeleton in mud, reduces the compressibility of mud to improve the strainability of mud.
Chinese patent CN104193127A discloses the treatment process of excess sludge after a kind of biological wastewater treatment, comprises municipal effluent excess sludge is mixed with mixed solution suspends under fast stirring, regulates pH to 2.0 ~ 4.0 with acid solution; Then mixed solution is heated to 50 ~ 70 DEG C, add copperas solution, Sodium Persulfate solution or potassium persulfate solution and 90-110 DEG C of oven dry, the industrial flyash crossing 200 mesh sieves (is respectively 0.07 ~ 0.15:1 containing thing weight ratio admittedly with mud, 0.4 ~ 0.6:1,0.2 ~ 0.4:1), stirring reaction 4 ~ 7 hours, then regulates pH to 9.0 with alkaline solution, flocculation sediment discharges supernatant liquor, then carries out processed.The method not only exists and uses bronsted lowry acids and bases bronsted lowry to regulate pH, and employs heat treated, adds the drawbacks such as the reaction times after flyash is long.
Chinese patent CN103819072A discloses a kind of deeply dehydrating sludge composite conditioner and application thereof, selects tensio-active agent (0.05 ~ 2.0% of mud dry weight), ferrous salt, persulphate (ferrous salt and persulphate mol ratio are 1.15: 1 ~ 1.30: 1) and physical property amendment diatomite, wilkinite or rectorite leng (5.0 ~ 30.0% of mud dry weight).The tensio-active agent dosage that the method existence uses is too high and simply add the problems such as physical property amendment.
In sum, the bibliographical information display of the existing published free radical lignin-sludge based on strong oxidizing property, main exist two technical problems: the acid of advanced oxidation processes needs is adjusted to acidity, and pH is to lower scope; The inorganics coagulant aids serving as framework construction body added, generally as just inert substance, dosage is higher, even exceedes 100% of mud butt quality, thus causes increase-volume and the increment of mud cake.How to find a kind of pH subject range wider, the metal ion generation synergistic effect that the inorganics coagulant aids simultaneously added can produce with advanced oxidation above, it is not only the skeleton serving as inertia, improve conditioning effect, reduce added amount of chemical, improve the porosity of conditioning mud, accelerate filtration velocity, improve the efficiency of deep dehydration.
Summary of the invention
For above defect or the Improvement requirement of prior art, the invention provides a kind of based on free-radical oxidn mud combined cooker and deep dehydration method, its object is to utilize living radical Oxidative demage mud flco to change particle characteristics, and directly utilize oxidation reaction by-products (Fe
2+, Fe
3+, SO
4 2-) effect of serving as medium crystallization agent promotes that industry by-product gypsum generation hydration reaction generates dihydrate gypsum phase (CaSO
42H
2o) skeleton structure material builds dewatering and filtering passage, and solving existing advanced oxidation conditioning mud thus needs to regulate pH, or it is excessive as inertia skeletal substance dosage to add merely powder material, the technical problems such as the moisture reduction of dehydrated sludge cake is limited.
For achieving the above object, according to one aspect of the present invention, provide a kind of based on free-radical oxidn mud combined cooker and deep dehydration method, technical solution of the present invention is as follows:
In primary sludge, add free radical produce thing, carry out combination treatment; In the described mud containing free radical generation thing, add the activator that free radical can be impelled to produce thing generation free radical carry out activation treatment, obtain the mud after activation treatment; Then in the mud after described activation treatment, add industry by-product gypsum and carry out combination treatment, form the conditioning mud with newborn matrix morphology material, finally described conditioning mud is carried out processed; Wherein, described activator selects one or more the mixture in Zero-valent Iron, nano zero valence iron, loaded with nano Zero-valent Iron.
Mud deep dehydration method of the present invention adopts Zero-valent Iron or nano zero valence iron etc. as activator, a series of single electron can be there is and transmit reaction to produce hydrogen peroxide in the ferrous ion that Zero-valent Iron oxidation produces with oxygen, thus oxidable destruction mud flco, in addition, under free radical produces thing existent condition, the oxidising process that Zero-valent Iron participates in is more obvious, mud flco can be destroyed further, mud granule surface charge just becomes from negative, mud flco water retention capacity reduces, and also makes to there is certain ion in system; On the other hand, ion after priming reaction completes has (comprising the part ion being destroyed release by mud flco) effect of medium crystallization agent, can directly and significantly promote that industry by-product gypsum generation hydration reaction generates matrix morphology material, and can regulate and control the material pattern of matrix morphology.Crack between product and industry by-product gypsum based on free-radical oxidn and there is significantly synergy, the formation of newborn skeletal substance improves the porosity of dehydrated sludge cake greatly, thus achieves the deep dehydration of mud.
The above technical scheme conceived by the present invention compared with prior art, can obtain following beneficial effect:
(1) whole conditioning system is without the need to regulation system pH, can carry out under wider pH environment, especially when pH is about 7, can directly reach desirable conditioning effect.Its operation is simple, and condition is easily controlled.Thus overcome traditional F enton and Fenton-like advanced oxidation must under pH is the condition of 2 ~ 5 drawback of competence exertion best effect.
(2) activate compared with persulphate with traditional Fe2+ that is used alone, Zero-valent Iron changes Fe into
2+process control, avoid a large amount of Fe in system
2+generate and be converted into Fe
3+, thus reduce the effective activation effect of living radical.
(3) ion contained in the mud of activation treatment, significantly can promote hydration reaction and the role serving as medium crystallization agent regulates and controls newly-generated matrix morphology material pattern, achieve priming reaction and the combination regenerating skeletal substance, this with to be used alone powder material traditionally and to serve as framework construction body and there is essential difference, also flco is destroyed advantageously than the simple advanced oxidation that uses, both the usage quantity of medicament can be reduced, significantly treatment effect can be improved again.
(4) newborn matrix morphology material is uniformly distributed with mud, significantly increases mud porosity, thus realizes deeply dehydrating sludge, make dehydrated sludge cake water ratio be down to less than 50%.Method is simple, and application is convenient, achieves the utilization of industry by-product gypsum.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of embodiment of the present invention deep dehydration method for sludge; Wherein, a is primary sludge, and b is the mud after activation treatment; C forms the conditioning mud with matrix morphology material, and c1 is the framework construction body that matrix morphology material is formed;
Fig. 2 is embodiment of the present invention deep dehydration method for sludge process flow diagram;
Fig. 3 is the scanning electron microscope microstructure comparison diagram before and after embodiment of the present invention combined cooker mud;
Fig. 4 is the mud cake varying aperture before and after embodiment of the present invention combined cooker.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is described in further detail.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Embodiments provide one and can effectively destroy extracellular polymeric in mud, reduce the compressibility of mud, the mud deep dehydration method of dewatering performance of sludge can be increased substantially, the party's ratio juris as shown in Figure 1, the method technical process as Fig. 2 so show.This deep dehydration method for sludge comprises the steps:
S01: obtain the mud producing thing containing free radical: add free radical and produce thing in primary sludge, carry out combination treatment;
S02: activation treatment is carried out to mud: add the activator that described free radical generation thing can be impelled to generate free radical in the described mud containing free radical generation thing and carry out activation treatment in the mud containing free radical generation thing of step S01, without the need to regulating pH to acid or alkaline, the mud after activation treatment can be obtained;
S03: build matrix morphology material in activated sludge, forms conditioning mud: add industry by-product gypsum in the mud after the activation treatment obtained in above-mentioned steps S02 and carry out mixing conditioning, form the conditioning mud with matrix morphology material;
S04: processed is carried out to conditioning mud: the conditioning mud in step S03 is carried out processed.
Particularly, in above-mentioned steps S01, primary sludge can be the mud of different sources, different shale, comprises mixing sludge or excess sludge in domestic sewage plants (water ratio is 95% ~ 99%), dewatered sludge (water ratio about 80%), paper mill sludge, municipal sludge etc.Produce thing to make the free radical in step S01 to mix more fully with mud and to react, when selected moisture percentage in sewage sludge is lower, as PAM dewatered sludge, solid content be belt filter press or the centrifuge dewatering mud cake of 75% ~ 85% time, first this mud can be carried out the pulp process that adds water, by the water ratio of mud modulation 90wt% ~ 99wt%.The freeze drying example of this mud is carried out electronic microscope photos, and its scanning electron microscope microstructure is as shown in Fig. 3 (a).
In this step S01, free radical produces thing can produce free radical under activator effect, and this radical pair can effectively destroy mud extracellular polymeric, reduces mud water retention capacity.In one embodiment, this free radical produces thing and selects persulfide.In certain embodiments, one or more the mixture in Potassium Monopersulfate, peroxy-monosulfate, peroxydisulfate selected by persulfide.This free radical selected produces bioenergy and effectively produce free radical under the effect of activator.
Contriver also finds, when the add-on of free radical generation thing is preferably 1 ~ 10% of primary sludge butt, the living radical produced and primary sludge butt ratio can fully destroy mud extracellular polymeric, change the surface properties of mud granule, improve the strainability of mud, improve the floc strength of mud, reduce mud Bound moisture content, the consumption that free radical produces thing can be saved again, reduce sludge treatment cost.
In this step S01, free radical produces thing and adds after in primary sludge, free radical should be made to produce thing and mix with primary sludge.In the lump free radical is produced thing as adopted to add in primary sludge, then stir, or adopt limit to add free radical generation thing limit stirring, make free radical product bioenergy dispersed in primary sludge.
In above-mentioned steps S02, after activator adds, it can produce produce liveliness proof free radical by activatable free radical, this living radical on the one hand as described above can rapid damage mud flco, degraded extracellular polymeric, thus changing the surface properties of mud granule, the freeze drying example of the mud after this activation treatment is carried out electronic microscope photos, and its scanning electron microscope microstructure is as shown in Fig. 3 (b); On the other hand, ion (comprising the part ion being destroyed release by mud flco) after priming reaction completes, serial hydration reaction can be there is fast with the industry by-product gypsum that adds in step S03, generate the material in a large number with crystalline structure, thus serve as the effect of framework construction body, build dewatering and filtering passage.
Contriver finds in R&D process, and the chemical action that different activators produces thing to free radical is different, also can produce different activatable free radical.Therefore, in embodiments of the present invention, this activator selects one or more the mixture in Zero-valent Iron, nano zero valence iron, loaded with nano Zero-valent Iron.This specific activator has that specific surface area is large, reactive behavior high, and living radical production rate can be made higher.Particularly, a series of single electron can be there is and transmit reaction to produce hydrogen peroxide in the ferrous ion that Zero-valent Iron oxidation produces with oxygen, thus oxidable destruction mud flco, in addition, under free radical produces thing existent condition, the oxidising process that Zero-valent Iron participates in is more obvious, mud flco can be destroyed further, mud granule surface charge just becomes from negative, and mud flco water retention capacity reduces, and also makes to there is certain ion in system; On the other hand, ion after priming reaction completes has (comprising the part ion being destroyed release by mud flco) effect of medium crystallization agent, can directly and significantly promote that industry by-product gypsum generation hydration reaction generates matrix morphology material, and can regulate and control the material pattern of matrix morphology.Crack between product and industry by-product gypsum based on free-radical oxidn and there is significantly synergy, the formation of newborn skeletal substance improves the porosity of dehydrated sludge cake greatly, thus achieves the deep dehydration of mud.
This activator can be that relative free-radical generation thing is enough namely excessive, but the generation efficiency of thing is produced in order to control free radical, save processing cost, in one embodiment, the mol ratio that the dosage of this activator and free radical produce thing dosage is (0.8 ~ 1.1): 1.
The mechanism that above-mentioned living radical produces can represent with following reaction formula:
Fe
0→Fe
2++2e
-
2Fe
0+O
2+2H
2O→2Fe
2++4OH
-
Fe
0+2H
2O→Fe
2++2OH
-+H
2
Fe
0+2Fe
3+→3Fe
2+
Fe
0+X→X
-·+Fe
3++X
2-
Fe
2++X→X
-·+Fe
3++X
2-
In formula: X is that free radical produces thing
X
-living radical
X
2-for generating by product
X
-can rapidly and mud flco react, thus reach and destroy mud flco, the effect of release Bound moisture.
In one embodiment, this activity adds after in mud, and actives should be made to mix with mud.In the lump actives is added in mud as adopted, then stir, or adopt limit to add the stirring of actives limit, make free radical product bioenergy dispersed in mud, and make both fully contacts, thus activatable free radical generation thing.
In order to effectively destroy mud extracellular polymeric, in one embodiment, living radical is 10 ~ 30min to the time of sludge activity process.Be understandable that, this activation treatment time can be longer.
Certainly, in one embodiment, activator is joined in above-mentioned steps S01, free radical is produced thing and adds in above-mentioned steps S02.Also can realize same effect, obtain the mud after activation treatment.
In above-mentioned steps S03, due in above-mentioned steps S02 activated process, in the process that free radical generation thing and activator react, except activatable free radical can be generated, other by products can also be generated, the generation by product Fe as above in text response formula
2+, Fe
3+, X
2-and mud flco destroys other ions of rear release when after processing industry by-product gypsum in the mud after activation treatment, these ionic byproducts can be had an effect to industry by-product gypsum, as made industry by-product gypsum generation hydration reaction, thus regenerate the material of matrix morphology.
CaSO
4·0.5H
2O+1.5H
2O→CaSO
4·2H
2O
Thus effectively solve organic compressibility problem in mud, that is to say the passage being formed Bound moisture circulation by the material of this matrix morphology in mud, and reduce the compressibility of mud, thus realize the deep dehydration of mud.
The passage of the Bound moisture circulation formed to make the matrix morphology material generated is more unimpeded, and in one embodiment, this industry by-product gypsum selects one or more the mixture in phosphogypsum, desulfurated plaster, citric acid gypsum.The Fe of the ionic byproducts that this industry by-product gypsum selected can generate in above-mentioned steps S02 activated process as above in text response formula
2+, Fe
3+, X
2-effect issue raw hydration reaction, thus generate a large amount of crystalline structure materials in Promotion system and be uniformly filled in mud flco and form high-quality dewatering and filtering passage, reduce the water content of sludge filter cake.The freeze drying example of this conditioning mud is carried out electronic microscope photos, and its scanning electron microscope microstructure is as shown in Fig. 3 (c).
Contrast above-mentioned Fig. 3 (a), Fig. 3 (b) and Fig. 3 (c) known, primary sludge as shown in Fig. 3 (a) is after activation treatment in above-mentioned steps S02, extracellular polymeric in mud is degraded, mud flco is destroyed, when the mud after the activation treatment shown in Fig. 3 (b) is nursed one's health after process through industry by-product gypsum in above-mentioned steps S03, the material in a large number with crystalline structure is generated in system, the material of this crystalline structure serves as framework construction body in mud, provides dewatering and filtering passage.Further, mercury penetration method is adopted to carry out pore size determination, if shown in the result Fig. 4 recorded to the such as mud shown in Fig. 3 (a), Fig. 3 (b) He Fig. 3 (c) respectively.Wherein, in Fig. 4, curve 1 represents the pore size distribution as the primary sludge of Fig. 3 (a), curve 2 represents the pore size distribution as the activation treatment mud of Fig. 3 (b), and curve 3 represents the pore size distribution adding the activation treatment mud of industry by-product gypsum as Fig. 3 (c).Correlation curve 1-3 is known, in curve 3 large, mesopore is more, illustrate that a large amount of crystalline structure substance advantageous that activation treatment promotes to generate are in forming the pore channel of moisture, thus improve the strainability of mud.
This crystalline structure material from simply add when the inert substances such as flyash, sawdust, wood chip nurse one's health mud as framework construction body different, inertia framework construction body only relies on physical agitation and mud to mix, can because the difference of material properties causes filtering layer water ratio uneven, and this complex method " regeneration " framework construction body is uniformly distributed in mud, the uniformity of dehydrated sludge cake can be significantly improved, and can not secondary pollution be caused.
The ionic byproducts effect that can effectively produce in priming reaction system in order to industry by-product gypsum issues the material that raw hydration reaction generates matrix morphology, in one embodiment, the method added when this industry by-product gypsum is: first described industry by-product gypsum is carried out modification at the lower process 1 ~ 3h of 105 ~ 250 DEG C, then add in the mud after activation treatment.It is axiomatic that combination treatment should be carried out to mud after adding the mud after activation treatment, this industry by-product gypsum is uniformly dispersed to greatest extent in mud.Wherein, the time of combination treatment is preferably 5 ~ 15min.
In another embodiment, the amount described industry by-product gypsum add-on in the mud after industry by-product gypsum adds activation treatment is more than 10% of described mud butt weight, is preferably 10%-40%.
Through above-mentioned steps S01, step S02 and step S03 to after sludge conditioning, flco in mud is destroyed, the surface properties of mud granule is changed, the ability of Bound moisture reduces, the a large amount of crystalline substances generated solve organic compressibility problem in mud, mud is formed and has periporate grid structure, keep the filtration channel of water, dewatering efficiency improves greatly.Therefore, in above-mentioned steps S04, directly deep dehydration process can be carried out to the conditioning mud formed in step S03.This dehydration treatment method can adopt the method for this area routine, as press filtration, the mechanical dehydration method such as centrifugal.Moisture percentage in sewage sludge after processed can reach less than 50%, and mud cake can be directly used in landfill, compost, burning or building materials and utilize.
Now for concrete sludge-dewatering compound conditioning agent and application method thereof, the present invention is further elaborated.
Embodiment 1
For a combined cooker method for deeply dehydrating sludge, processing step is as follows:
S11: take organic content as 50.8wt%, water ratio is starting point for 96.7wt% excess sludge, add the peroxydisulfate of mud butt 10wt% in mud, stirs fully;
S12: the nano zero valence iron adding the 1.8wt% of mud butt in the mud after step S11 process again, fully stirs 15min and completes living radical conditioning mud;
S13: subsequently, adds 30wt% phosphogypsum in the mud after step S12 conditioning, stirs 5min and completes combined cooker;
S14: the mud after being nursed one's health by step S13 is through sheet frame processed.
After tested, S12 sludge filtration resistivity is by 1.67 × 10 of former mud
13m/kg drops to 1.51 × 10
12m/kg, sludge capillary water absorbing time drops to 59.5s by the 320.8s of primary sludge, and S13 sludge filtration resistivity drops to 1.41 × 10 further
12m/kg, sludge capillary water absorbing time drops to 52.2s further.By mud after S13 combined cooker after sheet frame dehydration, water ratio is 48.7%.
Embodiment 2
For a combined cooker method for deeply dehydrating sludge, processing step is as follows:
S21: take organic content as 43.86wt%, water ratio is starting point for 95.3wt% excess sludge, add the peroxydisulfate of mud butt 8wt% in mud, stirs fully;
S22: the nano zero valence iron adding the 1.5wt% of mud butt in the mud after step S21 process again, fully stirs 10min and completes living radical conditioning mud;
S23: subsequently, adds 10wt% phosphogypsum in the mud after step S22 conditioning, stirs 10min and completes combined cooker;
S24: the mud after being nursed one's health by step S23 is through sheet frame processed.
After tested, S22 sludge filtration resistivity is by 1.61 × 10 of former mud
13m/kg drops to 1.42 × 10
12m/kg, sludge capillary water absorbing time drops to 62.8s by the 187.7s of primary sludge, and S23 sludge filtration resistivity drops to 1.37 × 10 further
12m/kg, sludge capillary water absorbing time drops to 56.8s further.By the mud after S23 combined cooker after sheet frame dehydration, water ratio is 50.0%.
Embodiment 3
For a combined cooker method for deeply dehydrating sludge, processing step is as follows:
S31: take organic content as 50.6wt%, water ratio is 82.0wt% centrifuge dewatering mud cake is starting point, the pulp that adds water is water ratio is after 91.7wt%, adds the nano zero valence iron of mud butt 3.3wt% in mud, stirs fully;
S32: the single peroxosulphuric hydrogen salt free radical adding the 10wt% of mud butt in the mud after step S31 process again produces thing, fully stirs 30min and completes living radical conditioning mud;
S33: subsequently, adds 15wt% desulfurated plaster and 10wt% citric acid gypsum in the mud after step S32 conditioning, stirs 8min and completes combined cooker;
S34: the mud after being nursed one's health by step S33 is through sheet frame processed.
After tested, when S32 sludge filtration resistivity is 91.7% by pulp water ratio 1.24 × 10
13m/kg drops to 0.86 × 10
12m/kg, 439.6s when sludge capillary water absorbing time is 91.7% by pulp water ratio drops to 62.5s, and S33 sludge filtration resistivity drops to 0.78 × 10 further
12m/kg, sludge capillary water absorbing time drops to 54.9s further.By the mud after S33 combined cooker after sheet frame dehydration, water ratio is 40.9%.
Embodiment 4
For a combined cooker method for deeply dehydrating sludge, processing step is as follows:
S41: take organic content as 55.3wt%, water ratio is starting point for 99.2wt% excess sludge, the peroxy-monosulfate free radical adding mud butt 10wt% in mud produces thing, stirs fully;
S42: under the state stirred, every 6min adds the zero-valent iron particle of the 3.3wt% of primary sludge butt in the mud after step S41 process, adds 3 times altogether.After last Zero-valent Iron adds, then stir 10min complete living radical conditioning mud;
S43: subsequently, adds 20wt% phosphogypsum, 20wt% desulfurization phosphogypsum in the mud after step S42 conditioning, stirs 10min and completes combined cooker;
S44: the mud after being nursed one's health by step S43 is through sheet frame processed.
After tested, S42 sludge filtration resistivity is by 4.15 × 10 of former mud
13m/kg drops to 2.34 × 10
12m/kg, sludge capillary water absorbing time drops to 20.3s by the 36.1s of primary sludge, and S43 sludge filtration resistivity drops to 2.22 × 10 further
12m/kg, sludge capillary water absorbing time drops to 16.4s further.By mud after S43 combined cooker after sheet frame dehydration, water ratio is 33.4%.
Embodiment 5
For a combined cooker method for deeply dehydrating sludge, processing step is as follows:
S51: take organic content as 50.8wt%, water ratio is starting point for 96.7wt% excess sludge, add the peroxydisulfate of mud butt 8wt% in mud, stirs fully;
S52: the nano zero valence iron adding the 2.0wt% of mud butt in the mud after step S51 process again, fully stirs 20min and completes living radical conditioning mud;
S53: subsequently, adds 20wt% desulfurated plaster, 10wt% phosphogypsum in the mud after step S52 conditioning, stirs 6min and completes combined cooker;
S54: the mud after being nursed one's health by step S53 is through sheet frame processed.
After tested, the Bound moisture content of S52 mud is reduced to 1.01g/g DS from the 2.60g/g DS of primary sludge, 61.1% Bound moisture wrapped up in primary sludge flco is released and is converted into free water, and the Bound moisture content of S53 mud is reduced to 0.81g/g DS further, the content of Bound moisture reduces 68.9%.In addition, the S52 mud porosity that mercury penetration method records mud is increased to 15.2% by 8.1% of former mud, with regard to and the porosity of S53 is increased to 17.0% further.After S53 combined cooker, mud is after sheet frame dehydration, and water ratio is 45.7%.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a deep dehydration method for sludge, comprises the steps:
In primary sludge, add free radical produce thing, carry out combination treatment;
In the described mud containing free radical generation thing, add the activator that described free radical can be impelled to produce thing generation free radical carry out activation treatment, obtain the mud after activation treatment;
In the mud after described activation treatment, add industry by-product gypsum carry out mixing conditioning, form the conditioning mud with newborn matrix morphology material;
Described conditioning mud is carried out processed;
Wherein, described activator selects one or more the mixture in Zero-valent Iron, nano zero valence iron, loaded with nano Zero-valent Iron.
2. deep dehydration method for sludge according to claim 1, is characterized in that: it is persulfide that described free radical produces thing.
3. deep dehydration method for sludge according to claim 2, is characterized in that: one or more the mixture in Potassium Monopersulfate, peroxy-monosulfate, peroxydisulfate selected by described persulfide.
4. according to the arbitrary described deep dehydration method for sludge of claim 1-3, it is characterized in that: described activator and described free radical produce the mol ratio of thing add-on for (0.8 ~ 1.1): 1.
5., according to the arbitrary described deep dehydration method for sludge of claim 1-3, it is characterized in that: the add-on that described free radical produces thing is 1 ~ 10% of primary sludge butt weight.
6. deep dehydration method for sludge according to claim 1, is characterized in that: described industry by-product gypsum add-on is 10 ~ 40% of described primary sludge butt weight.
7., according to claim 1-3,6 arbitrary described deep dehydration method for sludge, it is characterized in that: described industry by-product gypsum selects one or more the mixture in phosphogypsum, desulfurated plaster, citric acid gypsum.
8. according to claim 1-3,6 arbitrary described deep dehydration method for sludge, it is characterized in that: the method that described industry by-product gypsum adds is: first described industry by-product gypsum is carried out modification at the lower pre-treatment 1 ~ 3h of 105 ~ 250 DEG C, then pretreated industry by-product gypsum is added mixing conditioning in the mud after described activation treatment.
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