CN107188384A - The processing method of sludge - Google Patents

The processing method of sludge Download PDF

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Publication number
CN107188384A
CN107188384A CN201710428057.5A CN201710428057A CN107188384A CN 107188384 A CN107188384 A CN 107188384A CN 201710428057 A CN201710428057 A CN 201710428057A CN 107188384 A CN107188384 A CN 107188384A
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Prior art keywords
sludge
supernatant
processing method
persulfate
oxidation processes
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Inventor
曾清如
张维宁
肖智华
周细红
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Hunan Agricultural University
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Hunan Agricultural University
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Priority to CN201710428057.5A priority Critical patent/CN107188384A/en
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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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C02F1/62—Heavy metal compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/105—Phosphorus compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/06—Sludge reduction, e.g. by lysis

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Sludge (AREA)

Abstract

The invention discloses a kind of processing method of sludge, comprise the following steps：Oxidation processes are carried out to sludge using persulfate in acid condition, the processing to sludge is completed.By being handled in acid condition using persulfate sludge in processing method of the present invention; the dewatering of sludge can either be improved; the content of beary metal in sludge can be reduced again; have the advantages that technique is easy, operation is convenient, required equipment is few, operating cost is low, be easy to large-scale industrial production; minimizing, stabilisation, the utilization of innoxious and following resourceization of sludge are realized, with good application prospect.

Description

The processing method of sludge
Technical field
The invention belongs to field of environment protection, it is related to a kind of processing method of sludge, and in particular to one kind utilizes oxidant The method for handling sludge.
Background technology
At this stage, actual conditions and economic condition based on China, landfill and agricultural sludge are still as sludge treatment Transitional method is being implemented.The mode of which kind of sludge treatment no matter is taken, the minimizing of sludge is realized, is the key of Treatment of Sludge Place, for reduction Treatment of Sludge cost, promotes the influence of sustainable development, reduction to environment, has great significance.And it is dirty Mud dehydration is the emphasis of processing links, in order to which removal is present between mud granule and intragranular water, makes sludge Physical property changes over semisolid.
Conventional sludge conditioning method includes：Physics conditioning technology, chemical conditioning technology, biological conditioning technology, three kinds of sides Method essence directly uses this poor problem of mechanical dehydration effect mainly for sludge, in one carried out to sludge before dehydration Series is anticipated, to weaken the adhesion between the highly hydrophilic of sludge, reduction hydrone and sludge, so as to improve dehydration Performance.Sludge is after physics is nursed one's health, although can effectively reduce moisture content, improves the dissolution and hydrolysis of solid organic matters, but It is same that there is capital intensive, can not fundamentally solve the problems, such as the removal of sludge heavy-metal, potential is caused to operation health The unfavorable shortcomings such as harm.Biological conditioning technology belongs to environmentally friendly, safe, inexpensive new technique, but domestic at present The outer research level to the field is relatively low, and mechanism is still not clear.Simultaneously also exist Spawn incubation overlong time, oxidation rate compared with Slowly, the problems such as strain stability, it is not widely popularized in actual production.From traditional inorganic flocculating agent to high polymer coagulant with And composite flocculation agent, chemical conditioning is not only applied widely, the available property of reagent is more, at present to sludge dewatering effect and There is natural advantage on some intractable pollutants, but how some are had into defective traditional flocculants constantly by ring Border friendly conditioner is substituted, and is the bottleneck that chemical conditioning needs to break through instantly.
Meanwhile, substantial amounts of heavy metal is contained in sludge, is the another big obstruction of the agriculture sustainable use of sludge.There is research table Bright, the part content of beary metal of the sludge of sewage treatment plant is gradually reduced with the age, but most of heavy metal is still in undulating State.In the long run, the limitation standard of agricultural sludge can be increasingly stricter, and the heavy metal of municipal sludge needs to cause enough weights Depending on.It is higher plus partial contamination thing toxicity present in sludge, and contain the organic matter for being much difficult to directly be degraded by biology Matter, and when sludge pollution thing is handled by the way of conventional, it is difficult to obtain preferable effect.Traditional physical chemistry method is going decontamination Contaminate thing toxicity and improve Shortcomings in terms of sludge biodegradability.Some preconditioning techniques can not be completely thorough by toxic component Degrade to bottom, after the transfer of sludge, cause the secondary pollution on environment etc. to influence.Therefore, the basis of sludge dewatering is being improved On, it is that sludge disposal technology needs to reach by toxicity is high, difficult degradation pollutant is converted into small, the degradable material of toxic effect Ideal effect.
Property is relatively stable, it is necessary to combine the mode of activation to promote the life of potentiometric titrations at normal temperatures for persulfate Into.At present frequently with addition transition metal ions (Fe2+) mode come activate persulfate to sludge carry out deep dehydration, but gold The addition of category ion not only results in the change of sludge colourity, while the ratio that adds of pharmaceutical quantities there is no consistent conclusion, can also lead Sludge settling is caused to be deteriorated, such as：A large amount of precipitations of iron ion in ferrous sulfate, have produced substantial amounts of iron cement, or even can cause a large amount of Sludge suspension thing be difficult to settle in waste water.In the long run, the mode of activation persulfate is very important, but at present No matter take which kind of method (thermal activation, UV activation, transition metal activation) that the processing cost of sludge can be greatly improved.
The content of the invention
The technical problem to be solved in the present invention be overcome the deficiencies in the prior art there is provided a kind of technique is easy, operation is convenient, Required equipment is few, operating cost is low, be easy to the processing method of the industrial sludge of large-scale, and this method is improving sludge On the basis of dewatering, heavy metals most in sludge can be removed.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of processing method of sludge, comprises the following steps：Oxygen is carried out to sludge using persulfate in acid condition Change is handled, and completes the processing to sludge.
In above-mentioned processing method, it is preferred that the addition of the persulfate is described to be added in every liter of sludge Persulfate 3g~18g.
In above-mentioned processing method, it is preferred that the addition of the persulfate is described to be added in every liter of sludge Persulfate 6g~9g.
In above-mentioned processing method, it is preferred that the persulfate is potassium peroxydisulfate and/or ammonium persulfate.
In above-mentioned processing method, it is preferred that the oxidation processes are carried out under conditions of pH value is 2~3.
In above-mentioned processing method, it is preferred that the oxidation processes are carried out under agitation；The temperature of the oxidation processes Spend for 25 DEG C；The time of the oxidation processes is 60min.
In above-mentioned processing method, it is preferred that the sludge is the sludge containing heavy metal；Heavy metal in the sludge Including the one or more in Pb, Zn, Cu, Cd.
In above-mentioned processing method, it is preferred that further comprising the steps of after the completion of the oxidation processes：By oxidation processes institute Obtain product to be centrifuged, filter, obtain sludge cake and supernatant I.
In above-mentioned processing method, it is preferred that the supernatant I also includes following processing：Added into the supernatant I Calcium oxide is reacted, filtering, obtains supernatant II and heavy metal precipitation material；The matter of the calcium oxide and the supernatant I Amount is than being 0.25%~1.0%.
In above-mentioned processing method, it is preferred that the reaction is carried out under agitation；The temperature of the reaction is 25 ℃；The time of the reaction is 60min；The supernatant II is used to be back in the processing pond of sewage treatment plant.
Compared with prior art, the advantage of the invention is that：
(1) the invention provides a kind of processing method of sludge, sludge is handled using persulfate in acid condition, by It can pass through potentiometric titrations of the proton catalysis formation with Strong oxdiative property, in oxidized sludge, sulfuric acid in over cure acid group Root free radical, which can aoxidize breaking sludge, is improved dewatering performance of sludge, realizes the minimizing processing of sludge；Herein simultaneously In oxidizing process, the heavy metal in sludge is dissolved into solution, is effectively reduced the content of heavy metal in sludge, is solved sludge Limitations affect of the middle heavy metal to agricultural sludge.The processing method of the present invention can either improve the dewatering of sludge, again can The content of beary metal in sludge is reduced, with technique is easy, operation is convenient, required equipment is few, operating cost is low, be easy to big rule The advantages of modelling industrial production, minimizing, stabilisation, the utilization of innoxious and following resourceization of sludge are realized, with fine Application prospect.
(2) heavy metal release after being handled through persulfate oxidation in sludge is into liquid phase, and heavy metal contains in supernatant Amount increase, and sludge extracellular polymeric (EPS) is cracked in the oxidation processes of persulfate, some insoluble substances, Such as nucleic acid, lipid polymer substance are changed into solable matter and are discharged into liquid, the rise of supernatant TN, TP content, unfavorable In the recycling of supernatant.For above difficult point, also supernatant is handled using calcium oxide in the inventive method, The heavy metal in supernatant is removed with precipitation form by adding calcium oxide, is specially：Calcium oxide, which is dissolved in after supernatant, to be formed Hydroxide ion, using the capture of their heavy metals, precipitation, makes the heavy metal in supernatant change into deposit, So as to be effectively reduced the content of beary metal in supernatant, while the pH value of solution becomes alkali by acidity after oxidized Calcium treatment Property, the acid etching influence on equipment can be reduced.Contain in addition, the present invention can effectively reduce the phosphorus in water body by adding calcium oxide Amount, there is the meaning of the following aspects to environment：Avoid in the water of discharge because phosphorus content is too high, make the amount reproduction of algae, drop Dissolved oxygen in low water, prevents water ecosystem unbalance；Avoid impacting landscape ecological, because when generation wawter bloom red tide When, the whole water surface is easily largely covered by algae, hampers the attractive in appearance of water body.Even more noteworthy, containing for water systems'phosphorus is reduced Amount, to human health important in inhibiting, if human body bone can be caused loose because people drinks phosphorous water for a long time, hair Give birth to the problems such as jawbone is downright bad.It can be seen that, the present invention is handled supernatant using calcium oxide, can not only effectively reduce supernatant Content of beary metal in liquid, moreover it is possible to the phosphorus content effectively in reduction supernatant, it is such to have the technical effect that to enter using other materials It can not possibly be reached during row processing.In the present invention, the supernatant after oxidized Calcium treatment is back to returning for sewage treatment plant Flow in pond, the recycling again of resource can be realized.
Brief description of the drawings
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention In accompanying drawing, clear, complete description is carried out to the technical scheme in the embodiment of the present invention.
Fig. 1 is moisture content and sludge settling ratio of the different potassium peroxydisulfate additions to sludge cake in the embodiment of the present invention 1 Impact effect figure.
Fig. 2 is removal effect figure of the different potassium peroxydisulfate additions to Heavy Metals in Sludge in the embodiment of the present invention 1.
Fig. 3 is impact effect figure of the different potassium peroxydisulfate additions to sludge pH in the embodiment of the present invention 1.
Fig. 4 be in the embodiment of the present invention 2 under condition of different pH to the removal effect figure of Heavy Metals in Sludge.
Fig. 5 is that the mass ratio of different calcium oxide and supernatant I in the embodiment of the present invention 3 is gone to heavy metal in supernatant I Except design sketch.
Fig. 6 is that influence of the mass ratio of different calcium oxide and supernatant I in the embodiment of the present invention 3 to the pH value of supernatant I is imitated Fruit is schemed.
Embodiment
Below in conjunction with Figure of description and specific preferred embodiment, the invention will be further described, but not therefore and Limit the scope of the invention.
Material and instrument employed in following examples are commercially available, and sludge used is sewage plant excess sludge, is derived from Changsha City, Hunan Province sewage plant.In following examples, unless otherwise noted, the data obtained is to repeat the flat of experiment more than three times Average.
Embodiment 1
A kind of processing method of sludge, comprises the following steps：
(1) seven groups of primary sludges (content of heavy metal is as shown in table 1 in the primary sludge) are taken, are 5mol/L's with concentration H2SO4The pH value of solution regulation each group sludge is 2.
(2) it is respectively that 0,3g/L, 6g/L, 9g/L, 12g/L, 15g/L, 18g/L (are added in i.e. every liter sludge by addition Potassium peroxydisulfate 0,3g, 6g, 9g, 12g, 15g, 18g), adjusted to step (1) in the sludge after pH add potassium peroxydisulfate respectively, Stirred under constant temperature blender with magnetic force, in oxidation processes 60min at 25 DEG C, oxidation processes products therefrom is centrifuged, taken out Filter, obtains sludge cake and supernatant I, completes the processing to sludge.
The content of heavy metal in the primary sludge of table 1
Heavy metal Pb(mg/kg) Zn(mg/kg) Cu(mg/kg) Cd(μg/kg)
Content 204.5 521.53 278.56 1218.0
Water cut test (Wc)：The gross weight of the sludge cake obtained in Example 1, record sludge cake and crucible, 2h is dried in 103~105 DEG C of baking oven, is subsequently placed into drier and is cooled to room temperature, weigh, calculating obtains sludge cake Moisture content, as a result as shown in Figure 1.
Sludge settling ratio (SV30)：The sludge cake obtained in Example 1, is added in graduated cylinder, standing sedimentation 30min, Sludge settling ratio is determined, as a result as shown in Figure 1.
Fig. 1 is moisture content and sludge settling ratio of the different potassium peroxydisulfate additions to sludge cake in the embodiment of the present invention 1 Impact effect figure.Fig. 1 shows, in K2S2O8Addition be 3g/L under conditions of, the moisture content and sludge settling of sludge cake Than having declined, wherein, Wc76.5%, SV is reduced to by 82.6%3044% is dropped to by 65%.Work as K2S2O8Addition For between 6g/L~9g/L, WcWith K2S2O8The increase of addition and reduce, and trend gradually slows down, SV30Further reduction. When dosage is 9g/L, WcMinimum 74.7%.Work as K2S2O8Addition be more than 9g/L, SV30Change is little, basic to maintain Between 40%.WcWith K2S2O8There is the phenomenon slightly risen in dosage increase, and its reason is probably：K2S2O8It is used as non-choosing Selecting property oxidant, property is relatively stable at normal temperatures, has oxidation to sludge, can reduce the moisture content of sludge, improves Dewatering performance of sludge, but K2S2O8The reaction rate of system will not be not only improved when adding excess, on the contrary excessive K2S2O8Understand into For SO4 -Quencher, influence potentiometric titrations to the oxidation of sludge, cause moisture content to go up not down.
The sludge cake obtained in Example 1, is put into baking oven and dries 8.0h, then weighs 0.5g and dries sludge progress Clear up, determine the content of beary metal in sludge, as a result as shown in Figure 2.Fig. 2 adds for different potassium peroxydisulfates in the embodiment of the present invention 1 Enter removal effect figure of the amount to Heavy Metals in Sludge.As shown in Figure 2, oxidation processes are carried out using potassium peroxydisulfate, to weight in sludge Metal has good removal effect, and each heavy metals removal effect is Zn ＞ Cu ＞ Cd ＞ Pb, wherein, Pb, Zn, Cu, Cd highest Clearance respectively reaches 64.80%, 87.45%, 87.30%, 86.25%.When the addition of potassium peroxydisulfate is 3g/L to 9g/L When very fast is increased to the clearance of Pb, Zn, Cu, Cd in sludge, work as K2S2O8When addition is 9g/L, to Pb in sludge, Zn, Cu, Cd clearance can respectively reach 63.9%, 87.1%, 86.4%, 84.3%.And after 9g/L, clearance increasess slowly, The clearance of each heavy metal is increased slightly, but is tended to be steady substantially, and this is probably because increase K2S2O8Concentration, in solution Newly-increased SO4 -Can be with SO before4 -Reaction generation over cure acid groupAnd over cure acid groupAgain with solution SO4 -Directly generate sulfate radicalNow oxidation efficiency is no longer improved, and heavy metal removing rate is slightly increased.
The supernatant I obtained in Example 1, determines pH value, as a result as shown in Figure 3.Fig. 3 is in the embodiment of the present invention 1 Impact effect figure of the different potassium peroxydisulfate additions to sludge pH.From the figure 3, it may be seen that using the potassium peroxydisulfate pair of different additions Sludge is carried out after oxidation processes, and the pH value of supernatant I has risen, it may be possible to because the over cure acid group generated in solution is in acid Property under the conditions of can and H in solution+React, and by proton catalysis formation potentiometric titrations, cause pH to rise.
The supernatant I obtained in Example 1, reference《Water and effluent monitoring analysis method》(fourth edition) national environmental protection is total TN, TP analysis method in office (2009) is measured to supernatant I, as a result as shown in table 2.As shown in Table 2, compared to not adding Plus K2S2O8Control experiment, the present invention by adding K2S2O8Sludge is handled, the content of TN, TP in supernatant can be significantly improved, Wherein, TN, TP are with K2S2O8The increase of addition is in obvious ascendant trend, is then tended towards stability, reason is：In SO4 - Oxidation under, make sludge extracellular polymeric (EPS) and eucaryotic cell structure be destroyed, some original insoluble substances, such as The polymer substances such as protein, nucleic acid, lipid are changed into solable matter and are discharged into liquid, TN, TP content is substantially increased Plus.
Influence of the different potassium peroxydisulfate additions of table 2 to the water quality index of supernatant I
Embodiment 2
A kind of processing method of sludge, comprises the following steps：
(1) five groups of sludge (content of the Heavy Metals in Sludge is as shown in table 1), the H for being 5mol/L with concentration are taken2SO4Solution The pH value for adjusting each group sludge is 1,2,3,4,5.
(2) it is 9g/L (potassium peroxydisulfate 9g is added in i.e. every liter sludge) by addition, is adjusted respectively to step (1) after pH Potassium peroxydisulfate is added in sludge, is stirred under constant temperature blender with magnetic force, in oxidation processes 60min at 25 DEG C, to oxidation processes institute Product be centrifuged, suction filtration, obtain sludge cake and supernatant I, complete the processing to sludge.
The sludge cake obtained in Example 2, is put into baking oven and dries 8.0h, then weighs 0.5g and dries sludge progress Clear up, determine the content of beary metal in sludge, as a result as shown in Figure 4.Fig. 4 is right under condition of different pH in the embodiment of the present invention 2 The removal effect figure of Heavy Metals in Sludge.As shown in Figure 4, under conditions of system pH is 1-3, K2S2O8Have to each heavy metal Good removal effect, wherein Pb, Zn, Cu, Cd highest clearance respectively reaches 67.7%, 86.5%, 88.2%, 83.4%.Meanwhile, under conditions of system pH is 1-3, phase is influenceed by pH apparently higher than Pb, i.e. Pb to Zn, Cu, Cd removal Bigger than Zn, Cu, Cd, this is probably because solution containsIon can be generated with the part Pb ions being discharged into liquid phase Stable lead sulfate precipitation.In addition, as shown in Figure 4, under conditions of system pH is 4-5, K2S2O8To the clearance of each heavy metal It is on a declining curve, but removal effect is still preferable.From the aspect of processing heavy metal, acid condition is conducive to the leaching of heavy metal, Because with most of metal or its compound redox reaction can occur for the hydrogen ion in solution, capture outside the core of metallic atom Electronics, makes metallic atom and compound be converted into Ion release.It can be seen that, system pH has good when being 2-3 to sludge heavy-metal Good removal effect, and when being 1 compared to pH value, for adjusting the smaller with acid amount of pH, cost is lower.Particularly system pH For 3 when, the effect of acquirement is best.Likewise, also having very good effect to reduction moisture percentage in sewage sludge when system pH is 2-3.
Embodiment 3
A kind of processing method of sludge, comprises the following steps：
(1) four groups of sludge (content of the Heavy Metals in Sludge is as shown in table 1), the H for being 5mol/L with concentration are taken2SO4Solution The pH value for adjusting each group sludge is 2.
(2) it is respectively 9g/L (potassium peroxydisulfate 9g is added in i.e. every liter sludge) by addition, adjusts pH to step (1) respectively Potassium peroxydisulfate is added in sludge afterwards, is stirred under constant temperature blender with magnetic force, in oxidation processes 60min at 25 DEG C, at oxidation Reason products therefrom is centrifuged, and suction filtration obtains sludge cake and supernatant I.
(3) in mass ratio for 0.25%, 0.5%, 0.75%, 1.0%, (i.e. the mass ratio of calcium oxide and supernatant I is 0.25%th, 0.5%, 0.75%, 1.0%), calcium oxide is added in the supernatant I obtained into step (2), under agitation Reacted, wherein the temperature reacted is 25 DEG C, the time is 60min；Reaction product is filtered after the completion of reaction, obtained Clear liquid II and heavy metal precipitation material, complete the processing to sludge.
Sludge cake contains the nutrient needed for plant, can substantially increase the content of the nutrients such as nitrogen, phosphorus, be mixed with soil With fertilizer application is used for into soil, nutrient is provided for plant growth；Or supplement the relatively low element of some contents in sludge, Compound fertilizer is made to use, this greatly improves the value of sludge.Supernatant II is back to the backflow of sewage treatment plant Chi Zhong.Heavy metal precipitation material can be used for the re-using of metals resources, turn waste into wealth.
The supernatant II that 5ml embodiments 3 are obtained is taken, is put into colorimetric cylinder, Water bath is carried out in boiling water, sludge is determined The content of heavy metal in supernatant, as a result as shown in Figure 5.Fig. 5 is different calcium oxide and supernatant I in the embodiment of the present invention 3 Removal effect figure of the mass ratio to heavy metal in supernatant I.As shown in Figure 5, when the mass ratio of calcium oxide and supernatant I is When 0.25%, the clearance to Zn and Cu is respectively 79.9%, 73.9%, and there was only 25.2% He to Pb and Cd clearance 33%.When the two mass ratio is 0.5%, heavy metal Pb, Zn, Cu, Cd clearance respectively reach 59.6%, 83.5%, 79.0%th, 57.0%.The dosage of calcium oxide is further increased, when the mass ratio of calcium oxide and supernatant I is 0.75%, on Heavy metal Pb, Zn, Cu, Cd content are greatly reduced in clear liquid II, and respectively 58.9%, 87.0%, 86.5%, 85.3%, go Except rate is significantly improved.Continue the dosage of increase calcium oxide, when the mass ratio of calcium oxide and supernatant I is 1.0%, heavy metal Pb, Zn, Cu, Cd clearance can respectively reach 77.1%, 89.4%, 86.5%, 88.0%.It can be seen that, the present invention in calcium oxide with When the mass ratio of supernatant I is 0.25%~1%, have well to the heavy metal in supernatant I obtained by oxidation treatment Removal effect, especially, when the mass ratio of calcium oxide and supernatant I is 0.5%~1%, the removal effect of heavy metal is more It is good.
The supernatant II obtained in Example 3, determines pH value, as a result as shown in Figure 6.Fig. 6 is in the embodiment of the present invention 3 Impact effect figure of the mass ratio of different calcium oxide and supernatant I to the pH value of supernatant I.It will be appreciated from fig. 6 that Calcium oxide dissolution is to molten Substantial amounts of OH can be produced after in liquid-, so that the pH value of supernatant is accordingly improved, wherein with the increase of calcium oxide dosage, on The pH value of clear liquid is improved to 12.1 by 2.69.
Supernatant I, the supernatant II obtained in Example 3, is measured to supernatant TN, TP index, as a result such as table 3 It is shown.As shown in Table 3, using the calcium oxide of different additions to through K2S2O8Supernatant I after (9g/L) oxidation is handled, TN, TP content have different degrees of change in supernatant I.It is control group with supernatant I, with reference to table 2 as can be seen that oxidation The clearance that the mass ratio of calcium and supernatant I is TN in 0.5%, supernatant I reaches that 53.1%, TP clearances reach 99.2%, Because：As pH value ＞ 10, phosphorus mainly withWithForm is present, with calcium ion formation Ca3(PO4)2Precipitation, from And remove the phosphorus in solution.
Influence of the mass ratio of the different calcium oxide of table 3 and supernatant I to sludge supernatant water quality index
Described above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned implementation Example.All technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It is noted that for the art Those of ordinary skill for, improvements and modifications under the premise without departing from the principles of the invention, these improvements and modifications also should It is considered as protection scope of the present invention.

Claims (10)

1. a kind of processing method of sludge, it is characterised in that comprise the following steps：In acid condition using persulfate to dirt Mud carries out oxidation processes, completes the processing to sludge.
2. processing method according to claim 1, it is characterised in that the addition of the persulfate is every liter of dirt Persulfate 3g~the 18g is added in mud.
3. processing method according to claim 2, it is characterised in that the addition of the persulfate is every liter of dirt Persulfate 6g~the 9g is added in mud.
4. processing method according to claim 3, it is characterised in that the persulfate is potassium peroxydisulfate and/or over cure Sour ammonium.
5. according to processing method according to any one of claims 1 to 4, it is characterised in that the oxidation processes are 2 in pH value Carried out under conditions of~3.
6. according to processing method according to any one of claims 1 to 4, it is characterised in that the oxidation processes are in stirring bar Carried out under part；The temperature of the oxidation processes is 25 DEG C；The time of the oxidation processes is 60min.
7. according to processing method according to any one of claims 1 to 4, it is characterised in that the sludge is to contain heavy metal Sludge；Heavy metal in the sludge includes the one or more in Pb, Zn, Cu, Cd.
8. according to processing method according to any one of claims 1 to 4, it is characterised in that after the completion of the oxidation processes also Comprise the following steps：Oxidation processes products therefrom is centrifuged, filters, obtains sludge cake and supernatant I.
9. processing method according to claim 8, it is characterised in that the supernatant I also includes following processing：Described in Calcium oxide is added in supernatant I to be reacted, and is filtered, is obtained supernatant II and heavy metal precipitation material；The calcium oxide and institute The mass ratio for stating supernatant I is 0.25%~1.0%.
10. processing method according to claim 9, it is characterised in that the reaction is carried out under agitation；It is described anti- The temperature answered is 25 DEG C；The time of the reaction is 60min；The supernatant II is used for the processing pond for being back to sewage treatment plant In.
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Cited By (3)

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CN109305745A (en) * 2018-11-22 2019-02-05 湖南农业大学 A kind of method of cow dung deep dehydration
CN109336353A (en) * 2018-12-07 2019-02-15 杭州萧山环境投资发展有限公司 A kind of online Opsonizing method of deeply dehydrating sludge
CN115432899A (en) * 2022-08-03 2022-12-06 上海勘测设计研究院有限公司 Method for enhancing high-efficiency removal of toxic and harmful substances in sludge pyrohydrolysis process

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