CN102372411B - Dewatering method and dewatering apparatus for organic sludge - Google Patents
Dewatering method and dewatering apparatus for organic sludge Download PDFInfo
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- CN102372411B CN102372411B CN201110244205.0A CN201110244205A CN102372411B CN 102372411 B CN102372411 B CN 102372411B CN 201110244205 A CN201110244205 A CN 201110244205A CN 102372411 B CN102372411 B CN 102372411B
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Abstract
The present invention provides a control method for an inorganic coagulant adding amount under an inorganic coagulant post-addition method, a control method for a condensing clod, a dewatering method for a machine sludge and a dewatering apparatus for the dewatering method. The dewatering method comprises a condensing process (4), in which a high molecular coagulant (2) is added in an organic sludge (1), making the sludge condense and further forming a condensing sludge; a concentrating process for concentrating the formed condensing sludge; an inorganic coagulant adding process (7) for adding an inorganic coagulant in the concentrated condensing clod; a dewatering process (9) for mechanically dewatering the concentrated condensing clod after the inorganic coagulant is added, and/or an adjusting process (6) for adjusting the size of the concentrated condensing clod to be in a range of between 0.5m and 10mm. In the inorganic coagulant adding process (7), an inorganic coagulant is added, such that the condensing clod after the inorganic coagulant is added has a pH value of between 3 and 6, or the pH value of the dewatered filtrate is between 3 and 6.
Description
Technical field
The present invention relates to dewatering and the dewatering unit of organic sludge.Be specifically related to following dewatering and dewatering unit: it uses polymer coagulant and inorganic coagulant, organic sludge is carried out to method and the device of processed, wherein, utilize polymer coagulant that organic sludge is condensed, mud after concentrated condensation, add inorganic coagulant in mud after concentration, carry out mechanical dehydration, reduce dewatering and the dewatering unit of the moisture of the dehydrated sludge cake obtained.
Background technology
In recent years, require to reduce waste amount, reduce carrying capacity of environment.Of crucial importance from the dehydration technique of the organic sludge of sewage disposal device discharge, wish the dewatering developing effective organic sludge.In the past, when dewatering to organic sludge, general use " utilize polymer coagulant to make after mud condenses; to carry out the method for mechanical dehydration " (single-fluid process), " add inorganic coagulant in mud after; utilize polymer coagulant to condense, then carry out the method for mechanical dehydration " (inorganic coagulant first additive process).
About other dewaterings of organic sludge, exist " utilize polymer coagulant make mud condense after, carry out mechanical thickening or gravity concentration, then add inorganic coagulant, carry out the method for mechanical dehydration " (after inorganic coagulant additive process).After this inorganic coagulant, additive process is suitable for M basicity and (refers to and carry out by methyl red (methyl red) or tropeolin-D (methyl orange) basicity (alkalinity) measured as indicator.Also referred to as total alkalinity) dehydration of high organic sludge.In the first additive process of inorganic coagulant, because the alkaline components in organic sludge liquid consumes inorganic coagulant, so need a large amount of inorganic coagulants.On the other hand, after inorganic coagulant in additive process, remove alkaline components by sludge condensation, therefore can reduce the consumption of inorganic coagulant.In addition, compared with single-fluid process, after inorganic coagulant, additive process is effective to the reduction of moisture in dehydrated sludge cake.
About the technology relevant to additive process after inorganic coagulant, be known to following prior art.A kind of dewatering of organic sludge is disclosed in Japanese patent gazette JP 61-149300 publication, it is characterized in that, comprise following operation: the 1st operation, add mixed-cation system organic high-molecular coagulant in organic sludge after, stir this mud and generate clod; 2nd operation, carries out gravity filtration to this mud; 3rd operation, after adding mixed molysite, carries out pressurizing and dehydrating in the mud after this gravity filtration.In addition, disclose a kind of dewatering of digested sludge in Japanese Unexamined Patent Publication 9-24400 publication, it comprises: in digested sludge, add cationic polymers carry out coagulation treatment operation; Mud after condensation is carried out to the operation of gravity dehydration; Add inorganic coagulant in mud after gravity dehydration and carry out modified operation; Add amphiphilic polymers in mud after modified and utilize water extracter to carry out the operation of dewatering.But, there is not the record relevant to the optimization of inorganic coagulant addition in these prior aries, more particularly there is not the record relevant to the pH adding the pH of condensation mud after inorganic coagulant or the parting liquid of dehydration.In addition, do not exist in these prior aries to concentrated after the relevant record of the optimization of mud, more particularly do not exist to concentrate after the relevant record of the block size of mud.
Control relevant technology about to pH, be known to following prior art.A kind of dewatering of organic sludge is disclosed in Japanese Unexamined Patent Publication 4-284900 publication, its in organic sludge, add organic coagulants and carry out granulation concentrated after, mechanical dehydration machine is utilized to dewater to it, it is characterized in that, add inorganic coagulant to make after the pH of organic sludge becomes 3.0 ~ 5.0 scopes, add organic coagulants and carry out granulation concentrate, SS (the suspended solids of the mud relative to conveying is injected to transfer lime pipe, suspended solids) be 10 ~ 15 % by weight inorganic coagulant, sludge slurry after granulation concentrates by this transfer lime flows to mechanical dehydration machine.In addition, the pH inflation method to supply mud in a kind of processed is disclosed in Japanese Unexamined Patent Publication 10-165999 publication, it is characterized in that, when injecting inorganic coagulant in the mud being supplied to water extracter, the mud supply-pipe of the middle part between the connecting portion and water extracter of the supply line at inorganic coagulant arranges pH instrument, measure the pH of supply mud, automatically the output of the supply pump carrying inorganic coagulant is controlled according to this pH, above-mentioned connecting portion is the supply line of inorganic coagulant and the connecting portion of mud supply-pipe supplying mud to water extracter.
In addition, a kind of dewatering of mud is disclosed in Japanese Unexamined Patent Publication 8-173999 publication, the 1st condensing agent is added in its mud produced in effluent sewerage process, the p H of mud is adjusted to suitable pH, in this mud, add the 2nd condensing agent afterwards and be uniformly mixed, the condensation mud obtained is supplied to water extracter and dewaters, it is characterized in that, above-mentioned 1st condensing agent is polyiron sulfate condensing agent, above-mentioned suitable pH is 4.0 ~ 7.0, and above-mentioned 2nd condensing agent is cationic polymer coagulant.But these prior aries are technology relevant to the first additive process of the inorganic coagulant adding inorganic coagulant before adding polymer coagulant, are different from the present invention relevant to additive process after inorganic coagulant.Therefore, pH disclosed in these prior aries is applicable to additive process after inorganic coagulant, can not carry out optimum control to the addition of inorganic coagulant.
About the technology relevant to clod diameter, be known to following prior art.A kind of dehydration treatment method is disclosed in Japanese patent gazette JP 2009-165964 publication, it is characterized in that, add condensing agent in the mud produced in sewage disposal device and carry out 1 time coagulation treatment, high density concentration is carried out to the mud after 1 solidifying agent process, add condensing agent in mud after concentration and carry out 2 times coagulation treatment, more coagulation treatment to 2 times after high concentration sludge implement processed.Also record: at the clod of 1 coagulation treatment middle formation 2mm ~ 4mm size, at the clod of 2 coagulation treatment middle formation 0.5mm ~ 3mm.Also record: comparatively effective at 1 coagulation treatment middle polymer coagulant, comparatively effective at 2 coagulation treatment middle polymer coagulants, also can use the inorganic coagulants such as polyiron sulfate.But, there is not the record relevant to the optimization of inorganic coagulant addition in these prior aries, more specifically by record relevant for the pH do not existed to add the pH of condensation mud after inorganic coagulant or the parting liquid of dehydration.
Control among relevant prior art above-mentioned to pH, in Japanese Unexamined Patent Publication 4-284900 publication, add inorganic coagulant in the mode making organic sludge pH become the scope of 3.0 ~ 5.0, reduce the moisture of dehydrated sludge cake.In addition, in Japanese Unexamined Patent Publication 10-165999 publication, measure the pH of the mud after injecting inorganic coagulant, automatically control the output of the supply pump of conveying inorganic coagulant, reduce the usage quantity of inorganic coagulant.In addition, in Japanese Unexamined Patent Publication 8-173999 publication, add polyiron sulfate in the mud produced in effluent sewerage process, the pH of adjustment mud is 4.0 ~ 7.0, reduces the moisture of dehydrated sludge cake.But these prior aries are technology relevant to the first additive process of the inorganic coagulant adding inorganic coagulant before adding polymer coagulant, are different from the present invention relevant to additive process after inorganic coagulant.PH disclosed in these prior aries is applicable to additive process after inorganic coagulant, can not carry out optimum control to inorganic coagulant addition.Its reason is, after inorganic coagulant in additive process, removing in mud after solvability composition by sludge condensation, add inorganic coagulant, so sludge components when adding inorganic coagulant is different from sludge components when adding inorganic coagulant in the first additive process of inorganic coagulant.Especially, when the organic sludge that the M alkali concns such as digested sludge are high, after the first additive process of inorganic coagulant and inorganic coagulant between additive process, sludge components difference when adding inorganic coagulant greatly, so additive process after being difficult to optimum pH in first for inorganic coagulant additive process to be applicable to inorganic coagulant.
Among the above-mentioned technology relevant to additive process after inorganic coagulant, in Japanese patent gazette JP 61-149300 publication, in organic sludge, utilize positively charged ion system polymer coagulant to generate clod, carry out gravity filtration, add molysite and mix, carrying out pressurizing and dehydrating afterwards.In addition, in Japanese Unexamined Patent Publication 9-24400 publication, in digested sludge, add cationic polymers and carry out coagulation treatment, gravity dehydration is carried out to condensation mud, add inorganic coagulant and carry out modified, add amphiphilic polymers in mud after modulation and utilize water extracter to dewater.But, there is not the record relevant to the optimization of inorganic coagulant addition in these prior aries, more particularly there is not the record relevant to the pH adding the pH of condensation mud after inorganic coagulant or the parting liquid of dehydration.In addition, do not exist in these prior aries to concentrated after the relevant record of the optimization of condensation clod, more particularly do not exist to concentrate after the relevant record of the size of condensation clod.
As mentioned above, owing between additive process and the first additive process of inorganic coagulant, adding sludge components difference when inorganic coagulant after inorganic coagulant, so be necessary the optimum controling method studying inorganic coagulant addition.In addition, after inorganic coagulant in additive process, the optimum controling method studying the condensation clod after concentrating is necessary.Its reason is, the perviousness of inorganic coagulant, the reactive size greatly depending on condensation clod.
Patent documentation 1: Japanese Unexamined Patent Publication 4-284900 publication
Patent documentation 2: Japanese Unexamined Patent Publication 10-165999 publication
Patent documentation 3: Japanese Unexamined Patent Publication 8-173999 publication
Patent documentation 4: Japanese Laid-Open Patent Publication 61-149300 publication
Patent documentation 5: Japanese Unexamined Patent Publication 9-24400 publication
Patent documentation 6: Japanese Unexamined Patent Publication 2009-165964 publication
Summary of the invention
The object of the present invention is to provide the control method of the inorganic coagulant addition after a kind of inorganic coagulant under additive process and implement the device of the method.In addition, a kind of control method of the condensation clod after inorganic coagulant under additive process is provided and implements the device of the method.
In order to solve the problem, what the present inventor attentively studied found that following situation: after inorganic coagulant in additive process, adjusted in pre-determined range by the pH of the pH or dehydration parting liquid that will add the condensation clod after inorganic coagulant, can extremely effectively reduce mud cake moisture.In addition, the present inventor finds following situation: after inorganic coagulant in additive process, by the size of adjustment condensation clod, can extremely effectively reduce mud cake moisture.The present invention is completed based on these new discoveries.
That is, the invention provides a kind of dewatering of mud, it comprises: condensation operation, in organic sludge, add polymer coagulant, this mud is condensed and forms condensation clod; Enrichment process, concentrates the condensation clod formed; Inorganic coagulant adds operation, in concentrated condensation clod, add inorganic coagulant; And dehydration procedure, mechanical dehydration is carried out to the concentrated condensation clod after adding inorganic coagulant; It is characterized in that, adding the pH of condensation clod after inorganic coagulant or the pH of dehydration filtrate is 3 ~ 6.In above-mentioned dewatering, also can be that the dewatering of above-mentioned mud has adjustment operation, the size of concentrated condensation clod be adjusted to 0.5mm ~ 10mm by this adjustment operation.
In addition, the invention provides a kind of dewatering of mud, it comprises: condensation operation, in organic sludge, add polymer coagulant, this mud is condensed and forms condensation clod; Enrichment process, carries out concentrated inorganic coagulant to the condensation clod formed and adds operation, in concentrated condensation clod, add inorganic coagulant; And dehydration procedure, mechanical dehydration is carried out to the concentrated condensation clod after adding inorganic coagulant; It is characterized in that, the dewatering of above-mentioned mud has adjustment operation, and the size of above-mentioned concentrated condensation clod is adjusted to 0.5mm ~ 10mm by this adjustment operation.
And the invention provides a kind of dewatering unit of mud, it comprises: coagulating bath, it has the parts adding polymer coagulant in organic sludge, and forms condensation clod for making this mud condense; Thickner, it adds parts for carrying out concentrated inorganic coagulant to the condensation clod formed, and it for adding inorganic coagulant in concentrated condensation clod; And water extracter, it dewaters to the concentrated condensation clod after interpolation inorganic coagulant; It is characterized in that, the dewatering unit of above-mentioned mud has function unit, and this function unit is used for controlling the addition of inorganic coagulant, becomes 3 ~ 6 with the pH of the mud after making above-mentioned interpolation inorganic coagulant or dehydration filtrate.In above-mentioned dewatering unit, also can be, function unit has the pH sensor for measuring pH, can also be, the dewatering unit of above-mentioned mud has clod adjustment component at the latter stage of above-mentioned thickner, and this clod adjustment component is used for the size of concentrated condensation clod to be adjusted to 0.5mm ~ 10mm.
In addition, the invention provides a kind of dewatering unit of mud, it comprises: coagulating bath, and it has the parts adding polymer coagulant in organic sludge, and forms condensation clod for making this mud condense; Thickner, it is for concentrating the condensation clod formed; Inorganic coagulant adds parts, and it adds inorganic coagulant in determining at concentrated condensation mud; And water extracter, it dewaters to the concentrated condensation clod after interpolation inorganic coagulant; It is characterized in that, the dewatering unit of above-mentioned mud has clod adjustment component at the latter stage of above-mentioned thickner, and this clod adjustment component is used for the size of the condensation clod of above-mentioned concentrated mud to be adjusted to 0.5mm ~ 10mm.
According to the present invention, after inorganic coagulant in additive process, utilize the pH of the condensation clod after adding inorganic coagulant or the pH of dehydration parting liquid, determine the addition of inorganic coagulant, can extremely effectively reduce mud cake moisture.In addition, according to the present invention, after inorganic coagulant in additive process, the size of adjustment condensation clod, can reduce mud cake moisture thus extremely effectively.
As other effects of the present invention, the dirt on the pipe arrangement can suppress to be attached to the filtering surface of water extracter, flowing through for dehydration parting liquid etc.Its reason is, by controlling the pH of the condensation clod after interpolation inorganic coagulant or the pH of dehydration parting liquid, can suppress the principal constituent and the magnesium ammonium phosphate (MPA) that generate above-mentioned dirt.
Accompanying drawing explanation
Fig. 1 is the flowage structure figure of the example representing dewatering unit of the present invention;
Fig. 2 represents the mud cake moisture of embodiment 1 result and the coordinate diagram of p H relation;
Fig. 3 is the coordinate diagram representing the mud cake moisture of embodiment 2 result and the relation of clod size;
Fig. 4 is the coordinate diagram of the relation representing mud cake moisture under known first additive process in mud A and pH;
Fig. 5 is the coordinate diagram of the relation representing mud cake moisture under known first additive process in mud B and pH;
Fig. 6 is the coordinate diagram of the relation representing mud cake moisture under known first additive process in mud C and pH;
Fig. 7 is the coordinate diagram of the relation representing mud cake moisture under known first additive process in mud D and pH.
Embodiment
The present invention relates to the control method of the inorganic coagulant addition after inorganic coagulant under additive process and implement the device of the method.In addition, the present invention relates to the control method of the condensation clod after inorganic coagulant under additive process and implement the device of the method.Below, embodiments of the present invention are described in detail.
Fig. 1 is the flowage structure figure of the embodiment representing dewatering unit of the present invention.In FIG, organic sludge is supplied to coagulating bath 4 from mud storage tank 1.Polymer coagulant is supplied to coagulating bath 4 from polymer coagulant dissolving tank 2.In coagulating bath 4, organic sludge and polymer coagulant mix and form condensation clod.In thickner 5, concentrated condensation clod.In clod reconditioner 6, condensation clod is adjusted to suitable size.Inorganic coagulant is supplied to inorganic coagulant adding machine 7 from inorganic coagulant storage tank 3, adds in condensation clod.The condensation clod added after inorganic coagulant dewaters at water extracter 9.PH sensor 8 is utilized to measure the pH of the condensation clod after adding inorganic coagulant.According to the pH of the condensation clod after the interpolation inorganic coagulant measured by pH sensor 8, inorganic coagulant interpolation apparatus for controlling pump 10 is utilized to determine the addition of inorganic coagulant.Inorganic coagulant interpolation pump 10 is utilized to carry out the interpolation of inorganic coagulant.
In clod reconditioner 6, preferably, condensation clod is adjusted to 0.5mm ~ 10mm.It is further preferred that the size of condensation clod is adjusted to 0.5mm ~ 5mm.Its reason is, when the clod that condenses is large, inorganic coagulant can not penetrate into the inside of condensation clod, is difficult to the effect obtaining inorganic coagulant.On the other hand, when the clod that condenses is little, although inorganic coagulant can penetrate into the inside of condensation clod, little condensation clod is unfavorable for dewatering at water extracter.If condensation clod is adjusted to above-mentioned clod diameter, then inorganic coagulant penetrates into inside, can effectively utilize inorganic coagulant, also can effectively dewater in water extracter simultaneously.When using spiral pressing dehydrator, preferably, the size of condensation clod is adjusted to 1mm ~ 5mm.When using belt-type squeezing-dewatering machine, preferably, the size of condensation clod is adjusted to 0.5mm ~ 3mm.The size of condensation clod utilizes the rotating speed of stirrer that is arranged in clod reconditioner 6 or the shape of agitating vane to adjust.
Preferably, the pH of the condensation clod after inorganic coagulant being added into interpolation inorganic coagulant is 3 ~ 6.It is further preferred that pH inorganic coagulant being added into the condensation clod after interpolation inorganic coagulant is 3.5 ~ 5.5.Especially it is further preferred that the pH of condensation clod after inorganic coagulant being added into interpolation inorganic coagulant is 3.5 ~ 4.5.
Fig. 1 illustrates one embodiment of the present invention, but the invention is not restricted to illustrated content.Such as, clod reconditioner 6 is devices of adjustment condensation clod size, if but other devices or method can be utilized to adjust the size of condensation clod, then there is no need to arrange independently clod reconditioner 6.When inorganic coagulant adding machine 7 has stirrer, also can omit clod reconditioner 6, in inorganic coagulant adding machine 7, while adjusting condensation clod size rightly, in condensation clod, add inorganic coagulant.In addition, also clod reconditioner 6 can be omitted, at the latter stage configuration inorganic coagulant adding machine 7 of thickner 5.In addition, also clod reconditioner 6 can be omitted, inorganic coagulant adding machine 7 is integrated with thickner 5.In addition, also clod reconditioner 6 can be configured in the latter stage of inorganic coagulant adding machine 7.
PH sensor 8 also can be arranged on the storage tank of dehydration filtrate or the vent pipe of dehydration filtrate.Now, the addition of inorganic coagulant is determined according to the pH of the dehydration filtrate 8 measured by pH sensor 8.Now, preferably, in the mode making the pH of dehydration filtrate become 3 ~ 6, inorganic coagulant is supplied to inorganic coagulant adding machine 7.It is further preferred that in the mode making the pH of dehydration filtrate become 3.5 ~ 5.5, supply inorganic coagulant.Especially it is further preferred that in the mode making the pH of dehydration filtrate become 4 ~ 5, supply inorganic coagulant.
PH sensor 8 also can be arranged at inorganic coagulant adding machine 7.When the stability of characteristics etc. of organic sludge, if the addition having investigated inorganic coagulant in advance and the relation of pH mixing the condensation clod after inorganic coagulant, the addition of inorganic coagulant just can be determined.In this case, also pH sensor 8 can be omitted.
The organic sludge used in the present invention is the organic sludge produced in effluent sewerage process, fecaluria process, various Industrial Waste Water Treatments.Such as, initial clarifier sludge, excess sludge, anaerobically digested sludge, aerobic digested sludge, purification tank mud, digestion disengaging liquid etc. can be enumerated.Also organic/inorganic substance can be contained in organic sludge.
As the polymer coagulant used in the present invention, polymer coagulant general used in sludge treatment can be used in, such as, positively charged ion system polymer coagulant, Amphiphatic high polymer condensing agent etc. can be enumerated.
As the inorganic coagulant used in the present invention, inorganic coagulant general used in sludge treatment can be used in.Such as, iron(ic) chloride, Tai-Ace S 150, aluminum chloride, poly aluminium chloride, polyiron sulfate etc. can be enumerated.
As the water extracter used in the present invention, the water extracter used in sludge dewatering in the past can be used in.Such as, spiral pressing dehydrator, belt-type squeezing-dewatering machine, centrifuge, vacuum hydroextractor, filter pressing dehydrator, Polydisk water extracter etc. can be enumerated.
As the thickner used in the present invention, the gravity thickener or mechanical thickener that use in sludge dewatering in the past can be used in.Such as, belt thickener machine, Centrifugal concentrator, ellipse thickner etc. can be enumerated.
As the clod reconditioner used in the present invention, the stirrer used in sludge dewatering in the past can be used in.Such as, paddle stirrer, drum mixer etc. can be enumerated.
embodiment
(embodiment 1)
Carry out the sludge dewatering test after inorganic coagulant under additive process.Employ 4 kinds of digested sludges (A, B, C, D).Digested sludge A, B, C, D gather from 3 different sewage works.Although digested sludge A, B gather in same sewage work, sludge concentration is different.The TS (Total Solids, total solids) of digested sludge A, B, C, D is 2.2%, 1.3%, 1.8%, 1.5% respectively.As polymer coagulant, employ the positively charged ion system polymer coagulant of dimethylaminoethyl methacrylate or dimethylaminoethyl acrylate.As inorganic coagulant, employ polyiron sulfate.Test sequence is as follows.In the mud of 250mL, add cationic polymers, mud is condensed, form condensation clod.Then, the silk screen of 1mm is used to concentrate condensation clod.Then, in condensation clod, polyiron sulfate is added, condensation by mixing clod and polyiron sulfate.Then, the pH with the mixed condensation clod of polyiron sulfate is measured.Finally, utilize belt-type squeezing-dewatering machine to dewater to condensation clod, measure the moisture of the mud cake obtained.
Test-results shown in table 1.At this, using the weight that obtains after deducting " weight of the ironic hydroxide be settled out under the interpolation of polymeric iron " from " the drying solid thing weight of measurement " as " pure drying solid thing weight ", calculate mud cake moisture.
(table 1)
According to table 1, calculating the mean value of dehydrated sludge cake moisture that the pH adding the condensation clod after polyiron sulfate is " less than 6 and the situation larger than 3 ", " less than 5.5 and the situation larger than 3.5 ", " less than 4.5 and the situation larger than 3.5 ", is 80.2%, 79.9%, 79.7% respectively.According to this result, the pH adding the condensation clod after polyiron sulfate is preferably adjusted to pH3 ~ 6, and be more preferably adjusted to pH3.5 ~ 5.5, especially preferred is be adjusted to pH3.5 ~ 4.4, thus can reduce mud cake moisture.
As the mud cake moisture of the mud C of typical case and the relation of pH shown in Fig. 2.According to Fig. 2, along with the input rate of polyiron sulfate increases, the pH of the condensation clod after mixing polyiron sulfate reduces gradually.The pH of the condensation clod after mixing polyiron sulfate becomes before about 4 ~ 5, and mud cake moisture reduces gradually, once pH is greater than 4 ~ 5, mud cake moisture is constant or increase just.
(embodiment 2)
Carry out the sludge dewatering test after inorganic coagulant under additive process.Employ 3 kinds of digested sludges (C, E, F).Digested sludge C, E, F gather from 3 different sewage works.The TS of digested sludge C, E, F is 1.8%, 1.7%, 2.8% respectively.As polymer coagulant, employ cationic polymers.Cationic polymers is dimethylaminoethyl methacrylate system or dimethylaminoethyl acrylate system.As inorganic coagulant, employ polyiron sulfate.Test sequence is as follows.In the mud of 250mL, add cationic polymers, mud is condensed, form condensation clod.Then, the silk screen of 1mm is used to concentrate condensation clod.Then, in condensation clod, polyiron sulfate is added, condensation by mixing clod and polyiron sulfate.Now, the size with the mixed condensation clod of polyiron sulfate is measured.Finally, utilize belt squeeze water machine to dewater to condensation clod, measure the moisture of the mud cake obtained.
Test-results shown in table 2.Known according to table 2, the size of adding the condensation clod after polyiron sulfate is preferably adjusted to 0.5mm ~ 10mm, is more preferably adjusted to 0.5mm ~ 5mm, thus can reduces mud cake moisture.
(table 2)
As the mud cake moisture of the mud C of typical case and the relation of clod size shown in Fig. 3.The stirring number of times of transverse axis represents the stirring number of times under gravity fall.According to Fig. 3, along with the increase of stirring number of times, clod size reduces.Mud cake moisture is the highest when clod size is more than 10mm, and along with the reduction of clod size, mud cake moisture reduces.
(comparative example)
In order to confirm, by pH disclosed in the prior art relevant to the first additive process of inorganic coagulant is applicable to the first additive process of inorganic coagulant, whether can carries out optimum control to inorganic coagulant addition, and test.Employ and embodiment 1,2 identical 4 kinds of digested sludges (A, B, C, D).
Test sequence is as follows.In the mud of 250mL, add polyiron sulfate (polymeric iron), utilize spatula mixing sludge and polyiron sulfate, measure the pH of mud afterwards.Then, add cationic polymers, make mud condense and form condensation clod.Finally, utilize belt-type squeezing-dewatering machine to dewater to condensation clod, measure the moisture of the mud cake obtained.
The test-results of mud A ~ D is shown in Fig. 4 ~ Fig. 7 respectively.At this, using the weight that obtains after deducting " weight of the ironic hydroxide be settled out under the interpolation of polymeric iron " from " the drying solid thing weight of measurement " as " pure drying solid thing weight ", calculate mud cake moisture.According to Fig. 4 ~ Fig. 7, do not draw following result: under the first additive process of inorganic coagulant, in certain specific pH region, mud cake moisture reduces.
By contrasting method of the present invention (Fig. 2) with mud C and existing method (Fig. 6) is known, in the present invention, polyiron sulfate injection rate is few, can be pH3 ~ 6 by pH regulator, thus mud cake moisture can be reduced to less than 80%.
Claims (5)
1. a dewatering for mud, comprising: condensation operation, in digested sludge, add polymer coagulant, this mud is condensed and forms condensation clod; Enrichment process, concentrates the condensation clod formed; Inorganic coagulant adds operation, in concentrated condensation clod, add inorganic coagulant; And dehydration procedure, mechanical dehydration is carried out to the concentrated condensation clod after adding inorganic coagulant; It is characterized in that,
Adding the pH of condensation clod after inorganic coagulant or the pH of dehydration filtrate is 3 ~ 6.
2. want the dewatering of the mud described in 1 according to right, it is characterized in that,
The dewatering of above-mentioned mud had adjustment operation before above-mentioned dehydration procedure, and the size of above-mentioned concentrated condensation clod is adjusted to 0.5mm ~ 10mm by this adjustment operation.
3. a dewatering unit for mud, comprising: coagulating bath, and it has the parts adding polymer coagulant in digested sludge, and forms condensation clod for making this mud condense; Thickner, it is for concentrating the condensation clod formed; Inorganic coagulant adds parts, and it for adding inorganic coagulant in concentrated condensation clod; And water extracter, it dewaters to the concentrated condensation clod after interpolation inorganic coagulant; It is characterized in that,
The dewatering unit of above-mentioned mud has function unit, and this function unit is used for controlling the addition of inorganic coagulant, becomes 3 ~ 6 with the pH of the mud after making the above-mentioned inorganic coagulant of interpolation or dehydration filtrate.
4. the dewatering unit of mud according to claim 3, is characterized in that,
Above-mentioned function unit has the pH sensor for measuring pH.
5. the dewatering unit of the mud according to claim 3 or 4, is characterized in that,
The dewatering unit of above-mentioned mud has clod adjustment component in the last stage of above-mentioned water extracter, and this clod adjustment component is used for the size of the condensation clod of above-mentioned concentrated mud to be adjusted to 0.5mm ~ 10mm.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2010186772A JP5256261B2 (en) | 2010-08-24 | 2010-08-24 | Method and apparatus for dewatering organic sludge |
| JP2010-186772 | 2010-08-24 |
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| JP5974570B2 (en) * | 2012-03-21 | 2016-08-23 | 栗田工業株式会社 | Dewatering method and apparatus for pressurized floating sludge |
| JP6378865B2 (en) * | 2012-08-08 | 2018-08-22 | 水ｉｎｇ株式会社 | Sludge treatment method and apparatus |
| JP6425900B2 (en) * | 2014-03-13 | 2018-11-21 | 株式会社神鋼環境ソリューション | Sludge dewatering system and dewatering method of sludge |
| SE539912C2 (en) * | 2014-12-11 | 2018-01-09 | Kemira Oyj | Real-time dewatering optimization |
| JP6806332B2 (en) * | 2017-03-27 | 2021-01-06 | メタウォーター株式会社 | Water treatment equipment and water treatment method |
| KR101936416B1 (en) * | 2018-05-24 | 2019-01-08 | (주)태영필트레이션시스템 | Coagulant feeding device and sludge filtering system |
| KR102527197B1 (en) * | 2021-08-24 | 2023-04-28 | 주식회사 가경코스모 | Reduction of moisture content method for sludge cake |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0976000A (en) * | 1995-09-07 | 1997-03-25 | Kurita Water Ind Ltd | Sludge dehydrating method |
| JP2009028663A (en) * | 2007-07-27 | 2009-02-12 | Kurita Water Ind Ltd | Sludge dewatering method |
| JP2009165964A (en) * | 2008-01-16 | 2009-07-30 | Kobelco Eco-Solutions Co Ltd | Method and system for dehydrating sludge |
| CN101704629A (en) * | 2009-09-18 | 2010-05-12 | 东莞玖龙纸业有限公司 | Method for dynamically controlling continuous feeding in dehydration of papermaking sludge |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61149300A (en) * | 1984-12-25 | 1986-07-07 | Nittetsu Mining Co Ltd | Dehydration of organic sludge |
| JP3248188B2 (en) * | 1991-03-14 | 2002-01-21 | 栗田工業株式会社 | Organic sludge dewatering method |
| JP2960309B2 (en) * | 1994-09-08 | 1999-10-06 | 株式会社西原環境衛生研究所 | Sludge treatment equipment |
| JP3622274B2 (en) * | 1995-07-13 | 2005-02-23 | 栗田工業株式会社 | Digestion method of digested sludge |
| JP2000015300A (en) * | 1998-07-02 | 2000-01-18 | Japan Organo Co Ltd | Dehydration of sludge |
-
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0976000A (en) * | 1995-09-07 | 1997-03-25 | Kurita Water Ind Ltd | Sludge dehydrating method |
| JP2009028663A (en) * | 2007-07-27 | 2009-02-12 | Kurita Water Ind Ltd | Sludge dewatering method |
| JP2009165964A (en) * | 2008-01-16 | 2009-07-30 | Kobelco Eco-Solutions Co Ltd | Method and system for dehydrating sludge |
| CN101704629A (en) * | 2009-09-18 | 2010-05-12 | 东莞玖龙纸业有限公司 | Method for dynamically controlling continuous feeding in dehydration of papermaking sludge |
Non-Patent Citations (1)
| Title |
|---|
| 聂永丰.污泥的调理.《三废处理工程技术手册-固体废物卷》.化学工业出版社,2000,第415-417页. * |
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| JP5256261B2 (en) | 2013-08-07 |
| CN102372411A (en) | 2012-03-14 |
| JP2012045441A (en) | 2012-03-08 |
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