CN101448747A - A method and system of digesting excess sludge - Google Patents
A method and system of digesting excess sludge Download PDFInfo
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- CN101448747A CN101448747A CNA2007800187976A CN200780018797A CN101448747A CN 101448747 A CN101448747 A CN 101448747A CN A2007800187976 A CNA2007800187976 A CN A2007800187976A CN 200780018797 A CN200780018797 A CN 200780018797A CN 101448747 A CN101448747 A CN 101448747A
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Abstract
The present invention discloses a method for digesting excess sludge in an activated sludge treatment of organic waste water, excess sludge from the activated sludge aeration vessel is processed with hypochlorous acid in place of ozone without set up of aeration vessels and blowers to improve volume reduction cost of sludge without deterioration of water quality. The hypochlorous acid process is carried out by using an acidulous sodium hypochlorite aqueous solution which is prepared by mixing sodium hypochlorite aqueous solution with a dilute hydrochloric acid and diluting the resulting mixture with water within 1,000ppm to 50,000ppm of available chlorine concentration at a pH zone of more than 4 to less than 7.
Description
Technical field
The present invention relates to the method for the surplus mud that a kind of digestion produces in active sludge treatment, relate in particular to the continous processing system of the surplus mud that in the activated-sludge processing apparatus of handling organic drainage, produces.
Background technology
When in activity sludge treatmenting equipment, handling organic drainage, can produce a large amount of surplus muds in the aerator tank of activated-sludge processing apparatus.Always, the surplus mud warp that is produced is perhaps discharged, and perhaps burns after dehydration.But owing to exist to handle not enough and problems such as processing cost costliness, what therefore need to develop surplus mud subtracts the appearanceization technology.
Recently, proposition has multiple excess sludge volume reduction appearanceization system, and in said system, by various methodologies and device, make surplus mud rotten/decompose, and to a part of surplus mud can liquefy this time (to call " upgrading " or " can dissolve " in the following text), and for surplus mud is subtracted appearance, it is ideal zero perhaps according to condition its generation to be become, and the mud of upgrading is restored in the aerator tank of activated-sludge processing apparatus, handles.
Wherein, be expected to realize most, be the reducing sludge volume method of surplus mud being carried out in aerator tank, the TOHKEMY 2002-224600 communique of its digestion is put down in writing after the ozonize.
Yet although its excellent reducing sludge volume effect is proved, because of following reason, but seldom there is the example of practicability in excess sludge volume reduction appearanceization system in the past.
That is, that utilizes above-mentioned ozonize subtracts the appearanceization method, also processed and produce in the aerator tank of activated-sludge processing apparatus of surplus mud and carry out aerobic sigestion in draining.So the weight of mud becomes 1.3～1.5 times when not carrying out aerobic sigestion, and the surplus mud increase causes the off-capacity of aerator tank.And aerobic sigestion needs a large amount of air, for example during aerobic sigestion, when oxygen need not carry out aerobic sigestion more than 1.3 times.And, for aerobic sigestion needs ozone supply, therefore need to increase gas blower.
Although utilize the effect of excess sludge volume reduction appearanceization system of aerobic sigestion superior, be difficult to utilize aerobic sigestion that surplus mud is subtracted appearanceization, its reason is must increase the capacity of aerator tank, and need a large amount of gas blowers.
And ozone supply needs the ozonizer of high price, uses this ozonizer then to have the problem of treatment facility expense costliness.
Summary of the invention
It is a kind of that main purpose of the present invention is to provide, solve above-mentioned problem in the past, need not to set up aerator tank and gas blower (blower), and do not use under the situation of ozone, the surplus mud that is produced in the active sludge treatment to organic drainage subtracts the method or the system of appearanceization effectively.Second purpose of the present invention is to provide, and realizes excessive mud is subtracted the method or the system of appearanceization.
According to a first aspect of the invention, provide the method for the surplus mud that a kind of digestion produces in active sludge processing system, this active sludge processing system comprises: the operation of taking out surplus mud from activated-sludge processing apparatus or settling bath; Surplus mud is put into the operation of sludge digestion device; At the operation that at least a portion surplus mud of sludge digestion device adds slightly acidic hypochloric acid water solution, its mixture ratio makes that mixing the back is approximately 10 with respect to concentration, the surplus mud of 000mg/L, and the concentration of hypochloric acid water solution is 500～5,000ppm; Concentration of residual chlorine reach basically nonactive till, the operation that mud is restored to activity sludge treatmenting equipment or discharges.
According to a second aspect of the invention, provide the equipment of the surplus mud that a kind of digestion produces in active sludge processing system, this active sludge processing system comprises: activated-sludge processing apparatus and settling bath; Described equipment is provided with whipping appts, and handles the sludge digestion device of at least a portion surplus mud; According to the proterties of mud, preparation is become by hcl acidifying that the pH value is 4～7, concentration is 1,000～50, the preparation facilities of the slightly acidic aqueous sodium hypochlorite solution of 000ppm; At the surplus mud of sludge digestion device, according to the sludge concentration of sludge digestion device, with 50～2, the mixture ratio of 000ppm, the feedway of supply slightly acidic aqueous sodium hypochlorite solution; First path that the surplus mud that will extract out from activated-sludge processing apparatus or settling bath is supplied with; Sludge water is restored to activated-sludge processing apparatus for its second path of handling; Be used for measuring the determinator of the concentration of residual chlorine of the mud of handling; Make the concentration of residual chlorine of mud in the processing reach inactive after-treatment device in fact.
In a preferred embodiment, the sludge digestion device comprises a plurality of steel basins 31～33 that communicate with one another in regular turn, at each steel basin, be provided with and add the slightly acidic aqueous sodium hypochlorite solution, so that the addition portion that the concentration of slightly acidic aqueous sodium hypochlorite solution reduces to the downstream side steel basin successively from the upstream side steel basin.And, in order to make sludge water reach nonactive in fact, can return road, the residual chlorine treatment unit be set from the sludge digestion device to activated-sludge processing apparatus, and according to mud that aforesaid device is handled concentration of residual chlorine, the surplus mud of specified amount put into handles in the mud.In said structure or except said structure, can the additional storage groove be set in the return side of activated-sludge processing apparatus, store a certain amount of surplus mud in this additional storage groove, so that the mud of being handled by hypochlorous acid reaches nonactive in fact.And, the concentration of residual chlorine that can also measure according to determinator, the control device of the sludge concentration in the input amount of be adjusted at the hypochlorous mixture ratio that adds sludge water in the sludge digestion device to respectively, putting into the sludge water in the residual chlorine treatment unit and/or the above-mentioned additional storage groove.
When the mud of handling is restored in the active sludge, ozone is broken down into using the harmless oxygen of microorganism in active sludge treatment, affiliated thus technical field technician is known, and is when implementing active sludge treatment that the ozone utilization is also harmless in surplus mud is handled.But, utilization is handled microbial decontamination, germ-resistant hypochlorous acid, though concerning the person of ordinary skill in the field, do not conform with convention, it is shocking, by making concentration of residual chlorine reach nonactive in fact, can be used in the appearance that subtracts of mud without barrier to microbial decontamination, germ-resistant hypochlorous acid with being used for.
Adopt the present invention, 1) need not ozone generating-device at high price, can carry out the appearanceization that subtracts of mud with low cost.
And, 2) can subtract appearanceization to excessive mud by enough simple equipment, and can make the surplus mud generation become zero by the continuous processing of surplus mud.
And, 3) owing to the digestion by mud, slightly acidic hypochlorous acid is decomposed, disappears, and therefore the sludge water of handling can be restored in the Sludge System and be utilized again.
And, 4) and surplus mud can not make water quality deterioration, can remove its foul smell fully.
Description of drawings
Fig. 1 is expression subtracts the 1st entire system of appearanceization to surplus mud a synoptic diagram.
Fig. 2 is the synoptic diagram of the combination of expression hypochlorous acid preparation facilities and sludge digestion device.
Fig. 3 is expression subtracts the 2nd entire system of appearanceization to surplus mud a synoptic diagram.
Fig. 4 is the explanatory view of the principle of expression digestion surplus mud.
Embodiment
According to the present invention, use hypochlorous acid to digest the method for the surplus mud that in active sludge processing system, produces, mainly constitute by following operation:
1) from activated-sludge processing apparatus or settling bath, takes out surplus mud, and it is put into the sludge digestion device.
2) in the sludge digestion device, use hypochlorous acid to handle at least a portion mud, wherein by mud is mixed mutually with slightly acidic hypochloric acid water solution, mixture ratio makes that mixing the back is approximately 5 with respect to concentration, 000～10, the surplus mud of 000mg/L, the concentration of hypochloric acid water solution is 500～5,000ppm.
3) mud after will handling is restored to activated-sludge processing apparatus, perhaps discharges, so that the concentration of residual chlorine of the mud of handling reaches in fact is nonactive.
In a preferred embodiment, hypochlorous acid is handled, and can use to be become by hcl acidifying that the pH value is 4～7, concentration is 1,000～50, and the slightly acidic aqueous sodium hypochlorite solution of 000ppm is handled.Its reason is, electrolytic process is difficult to make 1,000～50, the high concentration hypochlorous acid aqueous solution of 000ppm, and the slightly acidic aqueous sodium hypochlorite solution is compared with the aqueous sodium hypochlorite solution that does not add hydrochloric acid, and its effect is higher.
In another preferred embodiment, hypochlorous acid is handled and is being interconnected so that carry out in a plurality of digestive shelfs of surplus mud portion's circulation within it, and more effectively carry out digestion process shown in Figure 4 easilier, therefore, in a plurality of digestive shelfs, make the effective chlorine density of institute's blended slightly acidic aqueous sodium hypochlorite solution in the surplus mud of circulation upstream side digestive shelf be higher than the downstream side digestive shelf.
In another preferred embodiment, return road from the sludge digestion device to activated-sludge processing apparatus is provided with the residual chlorine treatment unit, in this residual chlorine treatment unit, measure the concentration of residual chlorine of the mud of handling, and, the slightly acidic aqueous sodium hypochlorite solution plays germicidal action to the microorganism of activated sludge tank, therefore, devote in the mud of handling, so that concentration of residual chlorine reaches in fact is nonactive according to the surplus mud of measured value with specified amount.In addition, return side at activated-sludge processing apparatus can be provided with the additional storage groove, and storing the surplus mud of regulation in this additional storage groove, this surplus mud mixes with the sludge water of handling, and makes the concentration of residual chlorine of the sludge water of handling reach nonactive in fact.Therefore, in order to measure the concentration of residual chlorine in the mud of handling, return road from the sludge digestion device to activated-sludge processing apparatus is provided with determinator, thereby the concentration of residual chlorine of measuring according to determinator, adjustment add to sludge water in the sludge digestion device and slightly acidic aqueous sodium hypochlorite solution mixture ratio, add the sludge concentration in the addition of sludge water of residual chlorine treatment unit and/or the additional storage groove to, so that concentration of residual chlorine reaches inactive state in fact.
Fig. 1 represents the typical recycle system of above-mentioned preferred implementation that the surplus mud that is produced in the active sludge treatment is digested.This recycle system mainly is made of activated-sludge processing apparatus 1, settling bath 2, sludge digestion device 3.At sludge digestion device 3, the digesting excess sludge of extracting out from settling bath 2 becomes dissolved state, and the mud of handling is restored to activated-sludge processing apparatus 1.
In this activity sludge treatmenting equipment, organic drainage at first carries out active sludge treatment in activated sludge tank 1, and then solid-liquid separation in settling bath 2, and parting liquid is discharged to outside the system as handling draining.On the other hand, isolated mud, be restored to activated sludge tank 1 by a part of surplus mud that digestion process is crossed, and remainder is discharged outside system, make the sludge concentration of activated sludge tank 1 be adjusted into the sludge concentration that is suitable for active sludge treatment, for example 2,000～10,000mg/L comparatively it is desirable to 2,000～5,000mg/L.
Treatment unit at surplus mud shown in Figure 1, the surplus mud that extracts from settling bath is as 5,000～10, the surplus mud of 000ppm concentration is sent to sludge digestion device 3, at this, add slightly acidic aqueous sodium hypochlorite solution (3,000～15 by hypochlorous acid preparation facilities 4,000ppm), so that being handled by hypochlorous acid, sludge water fallen by digestion.The mud of the processing of thing as a result of, its concentration of residual chlorine reaches in fact after the inactive state, is restored to activated sludge tank 1.Therefore, should be by residual chlorine determinator 5, for example redox potential instrument etc. is measured the current potential of the mud of handling.Then, according to mensuration current potential, add surplus mud the residual chlorine treatment unit 6 on being arranged on from sludge digestion device 3 to activated-sludge processing apparatus 1 return road.At this, according to the concentration of residual chlorine in the mud of handling, the surplus mud of specified amount is put in the mud of the processing in the residual chlorine treatment unit 6, so that concentration of residual chlorine reaches inactive state in fact.In order to make sludge water reach nonactive in fact, can additional storage groove 7 be set in the return side of activated-sludge processing apparatus 1, at this, store surplus mud, so that the concentration of residual chlorine of the mud that hypochlorous acid is handled reaches nonactive in fact.
Shown in the 1st figure, setting involved in the present invention also comprises the equipment and the groove of following function.
At sludge digestion device 3, can digest surplus mud and make it to subtract appearanceization, shown in the 4th figure, handle mud by hypochlorous acid, and, dissolve and be decomposed to form stable glycolipid matter, the sugar-protein (the biological polymer that generates) of the microorganism piece of mud.
This hypochlorous acid is handled, and carries out in sludge digestion device 3.At this, the slightly acidic aqueous sodium hypochlorite solution adds the mud solution in the stirring to, and handles in order to implement hypochlorous acid effectively, maintains the pH value and be 4～7 slightly acidic state.Put into the amount of the hypochlorous acid solution in the sludge digestion device 3, should make: be approximately 5,000～10 at concentration, the surplus mud of 000mg/L makes hypochlorous acid after mud stirs or effective chlorine density 500～5, in the scope of 000ppm.At sludge digestion device 3, can in the middle of handling, adjust or change hypochlorous input amount.For example, shown in the 2nd figure, comparatively it is desirable to, sludge digestion device 3 comprises a plurality of vertically long steel basins 31,32,33 that are connected in series, and each steel basin 31,32,33 is provided with the 31a of injection portion, 32a, the 33a that is used to inject from the slightly acidic aqueous sodium hypochlorite solution of hypochlorous acid preparation facilities 4.At hypochlorous acid preparation facilities 4,41 stir stirring promptly from the clorox of NaOCl solution tank 43 with from the mineral acids such as hydrochloric acid of salt acid tank 42, and water dilutes, and makes the concentration of mixing solutions become 1,000～50,000ppm, comparatively it is desirable to 3,000～15,000ppm, the pH value is in pH4～7, thus acquisition slightly acidic aqueous sodium hypochlorite solution.According to measured signal from concentration of residual chlorine meter 34, add the concentration of each steel basin 31～33 to, the effective chlorine density (hypochlorous acid concentration or ionic concn) that may be controlled to upstream side channel 31 is higher than the effective chlorine density of downstream side channel 32 or 33.
Hypochlorous acid preparation facilities 4
Hypochloric acid water solution, STERI mixer (sterilant generating unit) stirrer 41 that can use Japanese HSP (stock company) to make prepares at the scene.Zhi Bei hypochloric acid water solution at the scene, its pH value is that pH4～6.5, concentration are 3,000～15,000ppm, this hypochloric acid water solution can be directly or the dilution back use.Shown in the 2nd figure, the hypochlorous acid preparation facilities comprises, stirrer 41, supply with first feedway 42 of dilute hydrochloric acid, supply with second feeder 43 of aqueous sodium hypochlorite solutions to stirrer 41 to stirrer 41, and prepare 1,000～50,000ppm comparatively it is desirable to 3,000～15, the slightly acidic aqueous sodium hypochlorite solution of 000ppm concentration.The concentration of this aqueous solution determines according to sludge concentration to be processed and character.Then, be prepared into the specified amount of the hypochloric acid water solution of normality, supply to sludge digestion device 3 by supply line 45, surplus solution is stored into storage tanks 44 by supply line 46.
During preparation slightly acidic aqueous sodium hypochlorite solution, if the pH value drops to below 4, the chlorine bleach liquor will produce chlorine, therefore, and with below 30%, preferably below 15%, the dilute hydrochloric acid and the aqueous sodium hypochlorite solution that are more preferably below 12% mix, and make its pH value become pH4～6.5, comparatively it is desirable to pH4.5～6, and are diluted with water to effective chlorine density and reach 3,000～15,000ppm., comparatively it is desirable to less than 4 for fear of the pH value, use pH such as acetic acid-sodium acetate aqueous solution, acetate aqueous solution, tartrate damping fluid, potassium acid phthalate-aqueous sodium hydroxide solution to adjust agent.And, can also use saleratus or sodium bicarbonate.
Activated sludge tank 1 utilizes microorganism that the upgrading surplus mud is decomposed digestion.The concentration of surplus mud is assumed to be 20, during 000mg/L, produces TOC conversion concentration usually and be about 10 in active sludge treatment, 000mg/L, COD conversion concentration are about 27, the surplus mud of 000mg/L.And, in order to improve the hypochlorous acid processing efficiency, comparatively it is desirable to, the pH value in the sludge digestion device 3 is maintained more than 4, thereby be chosen in the useful microorganism in the activated sludge tank 1.
Normally 25～40 ℃ of temperature of digestion process liquid, and the mud of handling is when carrying out membrane sepn, with the refrigerating unit cooling process cross mud be good.
Adopt method of excess sludge treatment of the present invention, can digest surplus mud, make the vanishing of surplus mud amount by the hypochlorous acid processing., comprise inorganics or hard-decomposed organic matter in the surplus mud sometimes.Therefore needn't make the volume reduction rate of the mud of handling leave no choice but become 0.
The treatment unit of surplus mud shown in Figure 1 is only represented an example of embodiments of the present invention, and the person of ordinary skill in the field can carry out following distortion, improvement to embodiment within the scope of the invention.
On 1 the return road residual chlorine treatment unit 6 can be set from sludge digestion device 3 to activated sludge tank, and according to the concentration of residual chlorine of the mud of handling, input makes the concentration of residual chlorine in the mud of handling reach nonactive in fact from the surplus mud water of activated sludge tank 1.
In addition, return side at activated sludge tank 1 can be provided with additional storage groove 7, and stores the surplus mud of specified amount in this additional storage groove 7, this surplus mud is used for the processing of mud, and is used to make the concentration of residual chlorine of the mud of returning the processing of coming to reach nonactive in fact.
In addition, on 1 the return road concentration of residual chlorine meter 5 can be set from the sludge digestion device to activated sludge tank, and the concentration of residual chlorine of the mud of the processing of being measured according to concentration of residual chlorine meter 5, the input amount of the mud of can adjust or control the hypochlorous mixture ratio that adds in the sludge digestion device 3 in the mud, putting into residual chlorine treatment unit 6 and the sludge concentration in the additional storage groove 7.
As mentioned above, adopt surplus mud circular form treatment system, need not to strengthen or set up aerator tank and gas blower (blower), can handle the surplus mud that produces from organic drainage effectively by the hypochlorous acid processing in active sludge treatment, its result can realize a large amount of appearanceizations that subtracts in circular treatment.
Fig. 3 represents second embodiment of the recycle system involved in the present invention.Utilize activated sludge tank 10, the settling bath 20 of microbiological treatment organic drainage and be used to digest the digestive shelf 30 of surplus mud, supplying with road Ch (1) and second by first, to supply with road Ch (2) interconnection.Digestive shelf 30 is supplied with road Ch (2) by second and is connected with NaOCl solution generating unit 40.In this device,, use hydrochloric acid that its acidifying is become pH4～7, thereby prepare 1,000～50, the slightly acidic aqueous sodium hypochlorite solution of 000ppm from groove 42 by mixing from the clorox and the water of groove 41.The slightly acidic aqueous sodium hypochlorite solution, under the situation of controlled valve 9 controls,, supply with road Ch (2) by second and supply to digestive shelf according to level sensing transducer (level sensor) the 8 surplus mud amounts of being measured, with at about 5,000～10, the surplus mud of 000mg/L makes the mixture ratio of slightly acidic aqueous sodium hypochlorite solution be adjusted into 500～5,000ppm, comparatively it is desirable to 1,000～3,000ppm.Control valve according to the signal that the determinator that detects concentration of residual chlorine is measured, is controlled by controller 100.
Specifically, be provided with flow in the activated sludge tank 10 and adjust groove 11, be provided with first at settling bath 20 and supply with road Ch (1) with submersible pump.This supply road Ch (1) is divided into three, and first fen branch road is restored to 10, the second fens branch roads of activated sludge tank and is connected with mud storage tanks 21, and branch road was connected with digestive shelf 30 in the 3rd minute.At digestive shelf 30, measure the input amount of mud by level sensing transducer 8.
On the other hand, in order to control the input amount of mud, and at sludge water (5,000～10, the sludge water of 000ppm/kg) mixture ratio with the slightly acidic aqueous sodium hypochlorite solution is adjusted into 500～5,000ppm, digestive shelf 30, by being arranged on the control valve 9 of returning road Ch (3), be connected hypochlorous acid solution feedway.
Mixture ratio, the signal of being measured according to the concentration of residual chlorine meter determines.This concentration of residual chlorine meter 50 in order to judge concentration of residual chlorine, compares current potential that is arranged on an ORP device 51-1 who returns road Ch (3) and the current potential that is arranged on the 2nd ORP device 51-2 of digestive shelf 30.The one ORP device 51-1, comprise sampling unit 52, transmit the sample that extracts pump 55, be used to clean one group of magnetic valve 53,54 of sampling unit and ORP transmitter 56.On the other hand, the 2nd ORP device 51-2, also comprise sampling unit 52, transmit the sample that extracts pump 55, be used to clean one group of magnetic valve 53,54 of sampling unit and ORP transmitter 56.Controller 100, signal according to concentration of residual chlorine, not only can control the concentration of slightly acidic aqueous sodium hypochlorite solution, the input amount of mud of putting into digestive shelf 30 and the combined amount of slightly acidic aqueous sodium hypochlorite solution, can also control the scavenging period of sampling unit, and to adjustment of gas blower etc.
Though second embodiment is a batch system, it will be apparent to those skilled in the art that the continous way system that can change over first embodiment at an easy rate.
Claims (12)
1. method of using the surplus mud that hypochlorous acid digestion produces in active sludge processing system, this method comprises:
Take out surplus mud from activated-sludge processing apparatus or settling bath, put into the sludge digestion device;
Utilize hypochlorous acid to handle the interior at least a portion surplus mud of above-mentioned sludge digestion device, wherein by mud is mixed mutually with slightly acidic hypochloric acid water solution, its mixture ratio makes that mixing the back is approximately 5 with respect to concentration, 000～10, the surplus mud of 000mg/L, the concentration of hypochloric acid water solution is 500～5,000ppm;
The mud of handling is restored to above-mentioned activated-sludge processing apparatus, perhaps discharges, so that concentration of residual chlorine reaches in fact is nonactive.
2. the method for the surplus mud that digestion according to claim 1 produces in active sludge treatment is characterized in that:
The above-mentioned operation of utilizing hypochlorous acid to handle mud is used to be become by hcl acidifying that the pH value is 4～7, concentration is 1,000～50, and the slightly acidic aqueous sodium hypochlorite solution of 000ppm is handled.
3. the method for the surplus mud that digestion according to claim 1 and 2 produces in active sludge treatment is characterized in that:
The above-mentioned operation of utilizing hypochlorous acid to handle mud, interconnecting so that carry out above-mentioned processing in a plurality of digestive shelfs of surplus mud circulation, and making the effective chlorine density of institute's blended slightly acidic aqueous sodium hypochlorite solution in the surplus mud of circulation upstream side digestive shelf be higher than the downstream side digestive shelf.
4. the method for the surplus mud that digestion according to claim 1 and 2 produces in active sludge treatment is characterized in that:
Be provided with the residual chlorine treatment unit the return road from the sludge digestion device to above-mentioned activated-sludge processing apparatus, thereby measure the concentration of residual chlorine in the mud of above-mentioned processing, and according to this measured signal, the surplus mud of specified amount is put in the mud of handling, so that the concentration of residual chlorine in the mud of handling reaches inactive state in fact.
5. the method for the surplus mud that digestion according to claim 1 and 2 produces in active sludge treatment is characterized in that:
Return side at above-mentioned activated-sludge processing apparatus is provided with the additional storage groove, in this additional storage groove, store a certain amount of surplus mud, this surplus mud is used for mixing with the sludge water of returning the processing come, so that the concentration of residual chlorine of the sludge water of handling reaches in fact is nonactive.
6. the method for the surplus mud that digestion according to claim 1 and 2 produces in active sludge treatment is characterized in that:
Be provided with the determinator of the concentration of residual chlorine of the mud that is used to measure above-mentioned processing the return road from the sludge digestion device to activated-sludge processing apparatus.
7. the method for the surplus mud that digestion according to claim 1 and 2 produces in active sludge treatment is characterized in that:
According to the concentration of residual chlorine that the said determination device is measured, be adjusted at the mixture ratio that adds the slightly acidic aqueous sodium hypochlorite solution of above-mentioned sludge water in the above-mentioned sludge digestion device to, input amount and/or the interior sludge concentration of above-mentioned additional storage groove of putting into the above-mentioned sludge water in the above-mentioned residual chlorine treatment unit.
8. equipment that uses the surplus mud that hypochlorous acid digestion produces in active sludge processing system, this equipment comprises:
Activated-sludge processing apparatus;
Settling bath;
The sludge digestion device, it is provided with mixing device, is used to utilize the slightly acidic aqueous sodium hypochlorite solution to handle at least a portion surplus mud;
The Digestive system preparation facilities mixes aqueous sodium hypochlorite solution and aqueous hydrochloric acid, and preparation pH value is 4～7, concentration is 1,000～50, the slightly acidic aqueous sodium hypochlorite solution of 000ppm;
Adding set, sludge concentration according to above-mentioned sludge digestion device, adding concentration is 1,000～50, the slightly acidic aqueous sodium hypochlorite solution of 000ppm, its mixture ratio make and are approximately 5 at concentration, 000～10, the surplus mud of 000mg/L, the concentration of aqueous sodium hypochlorite solution are 500～5,000ppm;
First path is extracted surplus mud out from above-mentioned activated-sludge processing apparatus or above-mentioned settling bath, supplies to above-mentioned sludge digestion device;
Second path is restored to above-mentioned activated-sludge processing apparatus with the mud of above-mentioned processing from above-mentioned sludge digestion device;
Determinator is measured the concentration of residual chlorine in the mud of above-mentioned processing;
After-treatment device according to the signal that the said determination device is measured, makes the mud of above-mentioned processing reach nonactive in fact.
9. the equipment of the surplus mud that digestion according to claim 8 produces in active sludge processing system is characterized in that:
Above-mentioned sludge digestion device comprises interconnective in regular turn a plurality of steel basins, in above-mentioned each steel basin, be provided with the above-mentioned adding set that is used to add the slightly acidic aqueous sodium hypochlorite solution, and make the concentration of the slightly acidic aqueous sodium hypochlorite solution in the upstream side steel basin be higher than the downstream side steel basin.
10. the equipment of the surplus mud that digestion according to claim 8 produces in active sludge processing system is characterized in that:
Make above-mentioned mud reach inactive above-mentioned after-treatment device in fact, comprise the residual chlorine treatment unit on the return road that is arranged on from above-mentioned sludge digestion device to above-mentioned activated-sludge processing apparatus, and, according to the concentration of residual chlorine in the mud of above-mentioned processing, the amount of the above-mentioned surplus mud in the mud of above-mentioned processing is put in decision, so that concentration of residual chlorine reaches inactive state in fact.
11. the equipment of the surplus mud that digestion according to claim 8 produces in active sludge processing system is characterized in that:
Make above-mentioned mud reach inactive above-mentioned after-treatment device in fact, the additional storage groove that comprises the return side that is arranged on above-mentioned activated-sludge processing apparatus, for the concentration of residual chlorine in the mud that makes above-mentioned processing reaches nonactive in fact, this additional storage groove stores a certain amount of surplus mud.
12. the equipment of the surplus mud that digestion according to claim 8 produces in active sludge processing system is characterized in that:
Also comprise control device, the signal of the concentration of residual chlorine that this control device is measured according to the said determination device, the sludge concentration in the input amount of be adjusted at the above-mentioned hypochlorous mixture ratio that adds above-mentioned mud in the above-mentioned sludge digestion device to, putting into the above-mentioned mud in the above-mentioned residual chlorine treatment unit and/or the above-mentioned additional storage groove.
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| JP086178/2006 | 2006-03-27 | ||
| JP2006086178 | 2006-03-27 | ||
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| CNA2007800187976A Pending CN101448747A (en) | 2006-03-27 | 2007-03-26 | A method and system of digesting excess sludge |
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| CN111533403A (en) * | 2020-04-22 | 2020-08-14 | 长沙理工大学 | Sludge washing conditioning treatment process |
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| JP4523989B2 (en) * | 2009-05-19 | 2010-08-11 | イーエス・テクノロジー株式会社 | Sludge reduction method and reduction device |
| CN110606619A (en) * | 2019-07-31 | 2019-12-24 | 北京航天国环技术有限公司 | Waste nitric acid treatment method and system |
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| CN111533403A (en) * | 2020-04-22 | 2020-08-14 | 长沙理工大学 | Sludge washing conditioning treatment process |
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Application publication date: 20090603 |