CN103253826A - Method and device for realizing phosphorus recovery during enhanced biological phosphorus removal process via heat treatment - Google Patents
Method and device for realizing phosphorus recovery during enhanced biological phosphorus removal process via heat treatment Download PDFInfo
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- CN103253826A CN103253826A CN2013101696294A CN201310169629A CN103253826A CN 103253826 A CN103253826 A CN 103253826A CN 2013101696294 A CN2013101696294 A CN 2013101696294A CN 201310169629 A CN201310169629 A CN 201310169629A CN 103253826 A CN103253826 A CN 103253826A
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Abstract
The invention provides a method for realizing phosphorus recovery during an enhanced biological phosphorus removal process via heat treatment. The method comprises the following steps of: (1) performing sequencing batch-type treatment on activated sludge and sewage, wherein the treatment method comprises the steps of charging oxygen in a stirring condition and adjusting the pH value of the system, and the reaction raw materials comprise acetate; and (2) performing heating treatment on the sludge-sewage mixture obtained in the step (1) in an anaerobic condition, and then performing sludge-sewage separation and phosphorus recovery. With the adoption of the novel method provided by the invention, the application range of the existing enhanced biological phosphorus removal process can be greatly expanded, and the stability of the system can be improved; simultaneously, the generation of sludge can also be reduced, the time and economic cost can be reduced, the energy consumption of the system can be reduced, and the engineered and large-scale development of the enhanced biological phosphorus removal process can be promoted; and additionally, with the adoption of the novel method provided by the invention, phosphorus removal is realized. Compared with the traditional technology, the novel method is higher in application value.
Description
Technical field
The present invention relates to sewage disposal technology and resource recovery technology field, be specifically related to a kind of method and device thereof of in the enhanced biological phosphorus removal process, realizing the phosphorus recovery by thermal treatment.
Background technology
In recent years, the national economy fast development, industrialization and urbanization degree improve constantly, China's water environment pollution phenomenon is serious day by day, the body eutrophication problem is frequent day by day, and the excessive emissions of phosphorus is the principal element that causes body eutrophication, therefore generally all needed to carry out dephosphorization and handle before sewage enters natural water.Simultaneously, phosphorus is DNA in the cell, and the component of RNA and ATP is being played the part of very important effect in vital movement, and the growth of plant is had irreplaceable effect.Yet, phosphorus is a kind of Nonrenewable resources, in the century in the past, people exploit Rock Phosphate (72Min BPL) as the main source of phosphorus, the high strength exploitation that continues makes this Nonrenewable energy resources progress into unsustainable level, whole world Rock Phosphate (72Min BPL) produced quantity reduces gradually, it is reported that global total reserves only enough uses 50-100.
Activated sludge process is widely used in industry and the processing of sanitary sewage at present, but the generation of excess sludge and subsequent disposal are its huge problems that faces in the activated sludge process.Usually, landfill and burning are the final treatment processs of excess sludge.But owing to contain a large amount of heavy metal components in the mud, thereby its subsidiary toxicity can cause detrimentally affect to surrounding enviroment, thereby these two kinds of disposal options do not have universality, and the resident is panic and oppose near causing easily.
Though traditional biological phosphate-eliminating technology can be removed the phosphorus in the sewage; but also can produce a large amount of rich phosphorus sludges simultaneously; reclaiming phosphorus and be used from rich phosphorus sludge is a very promising job; both can alleviate natural Rock Phosphate (72Min BPL) consume excessively and since phosphor resource deficient the crisis in food that may cause, can solve the handling problems of a large amount of excess sludges in certain sewage treatment process again.In general, the excess sludge that biological phosphate-eliminating technology produces has higher phosphorus content than general excess sludge, is approximately 3-7%.For biological phosphate-eliminating technology, the phosphorus great majority can be present in the mud with the form of polyphosphate (Poly-P).From excess sludge, reclaim phosphorus, necessary work is the phosphorus mode of releasing of a kind of stability and high efficiency of exploitation, the form of phosphorus contained in the excess sludge with soluble phosphate is discharged in the water, obtains the high concentration phosphorus acid salt solution, from the high concentration phosphorus acid salt solution, carry out the recovery of phosphorus then.
The enhanced biological phosphorus removal process is to utilize the special phosphorus inrichment of polyP bacteria (PAOs), finally realizes the removal of phosphor in sewage by the eliminating of rich phosphorus sludge.PolyP bacteria has very special metabolic process, in the anaerobism section, polyP bacteria absorbs organic carbon source and stores in vivo with the form of PHA, and the decomposition of simultaneous poly-P and the release of orthophosphoric acid salt are to provide energy, and the decomposition of glycogen simultaneously also provides part energy.At ensuing aerobic section, the excessive absorption orthophosphoric acid salt of polyP bacteria forms polyphosphoric acid salt (Poly-P) again, is accompanied by the decomposition of PHA and synthesizing again of glycogen in this process.From the metabolic process of polyP bacteria, as can be seen, under anaerobic, can make it discharge a large amount of phosphoric acid salt by adding additional carbon.Publication number as this laboratory application is the patent of invention of CN103011511A, utilizes the interpolation additional carbon to reclaim phosphorus exactly.But, because the metabolic process of microorganism is subjected to multiple factor, such as carbon source kind, temperature, influence of various factors such as pH value, the method that additional carbon is released phosphorus is very unstable.Therefore, realize that a kind of novel inducing release the phosphorus mode, and itself and enhanced biological phosphorus removal PROCESS COUPLING are realized that the recovery of phosphorus and mud decrement are one and press for the work of carrying out.
Summary of the invention
In order to address the above problem, the object of the present invention is to provide a kind of novel method and device thereof of in the enhanced biological phosphorus removal process, realizing the phosphorus recovery by thermal treatment.
In order to realize purpose of the present invention, the invention provides following technical scheme:
A kind ofly realize the method that phosphorus reclaims by thermal treatment in the enhanced biological phosphorus removal process, it comprises the steps:
(1) handles active sludge sewage according to the sequence intermittent type: the pH value that the treating method comprises aerating oxygen and regulation system under stirring condition; Described reaction raw materials is acetate;
(2) heat treatment step (1) gained mud mixture under the anaerobic condition; Carry out mud-water separation subsequently, and carry out phosphorus and reclaim.
Preferably, treating processes described in the step (1) is to control draining ratio, settling time and the cycle of operation of reaction system by time-program(me).
Further, the invention provides a kind of device of in the enhanced biological phosphorus removal process, realizing the phosphorus recovery by thermal treatment, comprise: the main reactor that carries out the sewage disposal of sequence intermittent activated sludge, be connected the secondary response device of heat-treating phosphorus release and reclaiming with main reactor, the time-program(me) control device that is connected with main reactor, water supply installation, water-freeing arrangement, first automatic medicine adding apparatus, whipping appts and the apparatus of oxygen supply that oxygen in the reactor is provided, the device for separating mud and water that is connected with the secondary response device, the chemical precipitation device, described chemical precipitation device also is connected with second automatic medicine adding apparatus, and the present invention also comprises the heating and temperature controlling device that is connected with the secondary response device.
Preferably, described secondary response device is arranged on the main reactor downstream, and its volume is 1/8 of main reactor volume.
Preferably, described apparatus of oxygen supply comprises the air pump that is connected with the time-program(me) control device, be arranged on the core aeration head of inboard at the bottom of the main reactor tube, and source of the gas is transported to the core aeration head through air pump and carries out aeration; Described air pump arranged outside spinner-type flowmeter control gas velocity.
Preferably, monitoring is set in the described main reactor regulates first pH electrode of pH value, described first pH electrode is connected with first automatic medicine adding apparatus and its pH value is fed back to first automatic medicine adding apparatus, and first automatic medicine adding apparatus is adjusted dosing quantity according to the detection data of first pH electrode.
Preferably, monitoring is set in the described chemical precipitation device regulates second pH electrode of pH value, described second pH electrode is connected with second automatic medicine adding apparatus and its pH value is fed back to second automatic medicine adding apparatus, and second automatic medicine adding apparatus is adjusted dosing quantity according to the detection data of second pH electrode.
With respect to scheme of the prior art, advantage of the present invention is:
The traditional dephosphorization of enhanced biological phosphorus removal process anaerobism section, the excessive suction phosphorus of aerobic section finally reach the removal of phosphorus by spoil disposal, the inreal recovery that realizes phosphorus.The present invention impels mud to release phosphorus by carry out heat treated in the secondary response device, obtains the high concentration phosphorus concentrated solution and enters the recovery that phosphorus is realized in the chemical precipitation pond, and mud is back to main reactor.In the novel method that the present invention proposes, the removal of phosphorus is to realize that by the high concentration phosphorus concentrated solution phosphorus reclaims, rather than gets rid of mud, has so both reduced the discharging of excess sludge, has realized the recovery of phosphorus again.
The present invention proposes passes through thermal treatment realizes the phosphorus recovery in the enhanced biological phosphorus removal process novel method; can widen the range of application of existing enhanced biological phosphorus removal process greatly; improve system stability, can also reduce mud simultaneously and produce reduction time and Financial cost; reduce system energy consumption; promote through engineering approaches and the mass-producing of enhanced biological phosphorus removal process, in addition, the present invention has also realized the recovery of phosphorus; than conventional art, bigger using value is arranged.
Description of drawings
Fig. 1 releases phosphorus is realized the phosphorus recovery system under the situation of spoil disposal not structural representation for inducing by thermal treatment in the embodiment of the invention enhanced biological phosphorus removal process.
Wherein Reference numeral is as follows:
9 is main reactor; 15 is the secondary response device; 11 are the chemical precipitation device; 14 is device for separating mud and water; 18 is heating and temperature controlling device; 4 is peristaltic pump; 2 is first automatic medicine adding apparatus; 7 is first pH electrode; 17 is whipping appts; 3 is magnetic valve; 5 is air pump; 8 is the core aeration head; 6 is spinner-type flowmeter; 1 is program timer; 13 is second automatic medicine adding apparatus; 12 is second pH electrode.
Embodiment
Introduce the present invention in detail below in conjunction with accompanying drawing and embodiment thereof.But protection of the present invention orientation is not limited to following example, should comprise the full content in claims.
As shown in Figure 1, induce by thermal treatment in the enhanced biological phosphorus removal process and release phosphorus and realize that under the situation of spoil disposal not the phosphorus recovery system is the sbr reactor device, comprise the main reactor 9 that carries out the sewage disposal of sequence intermittent activated sludge, be connected the secondary response device 15 of heat-treating phosphorus release and reclaiming with main reactor, the time-program(me) control device 1 that is connected with main reactor, water supply installation, water-freeing arrangement, first automatic medicine adding apparatus 2, whipping appts and the apparatus of oxygen supply that oxygen in the reactor is provided, the device for separating mud and water 14 that is connected with the secondary response device, chemical precipitation device 11, described chemical precipitation device 11 also is connected with second automatic medicine adding apparatus 13, also comprises the heating and temperature controlling device 18 that is connected with the secondary response device.
Described system comprises two main reactor 9, secondary response device 15 and chemical precipitation devices 11 that volume is different.Secondary response device 15 is arranged on main reactor 9 downstreams, and reaction volume is 1/8 of main reactor.Main reactor 9 arranged outside water-in and water outlets, water supply installation is connected into water-in, and described water outlet connects water-freeing arrangement.Apparatus of oxygen supply comprises the air pump 5 that is connected with time-program(me) control device 1, be arranged on the core aeration head 8 of inboard at the bottom of 9 of the main reactors, and source of the gas is transported to core aeration head 8 through air pump 5 and carries out aeration; Air pump 5 arranged outside spinner-type flowmeters 6 control gas velocities.Water supply installation comprises the peristaltic pump 4 that is connected with time-program(me) control device 1, and time-program(me) control device 1 is by peristaltic pump 4 control water intake velocity.Water-freeing arrangement comprises the magnetic valve 3 that is connected with time-program(me) control device 1, and time-program(me) control device 1 is controlled out water speed by magnetic valve 3.Whipping appts comprises the stirring rake 17 that is connected with time-program(me) control device 1, and time-program(me) control device 1 is controlled out water speed by magnetic valve 17.Monitoring is set in the main reactor 9 regulates first pH electrode 7 of pH value, first pH electrode 7 is connected with first automatic medicine adding apparatus 2 and its pH value is fed back to first automatic medicine adding apparatus, 2, the first automatic medicine adding apparatus 2 adjusts dosing quantity according to the detection data of first pH electrode 7.Mud mixture enters secondary response device 15 through peristaltic pump 10 by main reactor 9.By carrying out heat treated in 18 pairs of secondary response devices 15 of heating and temperature controlling device.Device for separating mud and water 14 is non-woven fabrics, after mud-water separation, and mud backflow main reactor 9, solution enters chemical precipitation device 11.Monitoring is set in the chemical precipitation device 11 regulates second pH electrode 12 of pH value, described second pH electrode 12 is connected with second automatic medicine adding apparatus 13 and its pH value is fed back to second automatic medicine adding apparatus, 13, the second automatic medicine adding apparatus 13 adjusts dosing quantity according to the detection data of second pH electrode 12.
System is raw material with the acetate, and main reactor 9 is according to water inlet, anaerobism, aerobic, precipitation, draining operation; Secondary response device 15 is according to advancing mud, heat treated, mud-water separation operation.9 cycles of operation of main reactor are 4 times/day, weekly 6 hours phases; 15 cycles of operation of secondary response device are 1 time/day, weekly 1 hour phase.Before aerobic section finished, 1/8 mud mixture entered secondary response device 15 by main reactor 9, carries out heating operation by 18 pairs of secondary response devices of heating and temperature controlling device 15.Reaction back backflow main reactor 9 after the mud-water separation before main reactor 9 aerobic sections begin.In the operational process, regulate draining ratio, settling time and the cycle of operation by program timer 1.
Main reactor 1 reaction volume is 8L.Main reactor device body different heights place is provided with the outlet for water inlet, water outlet and sampling respectively.Main reactor 1 total height 120cm, water-in, thief hole and water outlet are separately positioned on the device body from bottom 30cm, 60cm and 90cm place.Main reactor 1 is controlled and working time automatically by the time sequence of control, and water inlet adopts peristaltic pump to pump into, and the water outlet of main reactor 1 is by solenoid control, and air pump 5 is the reactor oxygen supply and ensures sufficient the stirring.Core aeration head 8 is equipped with in main reactor bottom makes in the main reactor aeration and fluidised form more even.Secondary response device 15 reaction volumes are 1L, and after mud mixture was pumped into from main reactor by peristaltic pump, heat treated was released phosphorus fully by device for separating mud and water 14, and solution enters the chemical precipitation pond and carries out the phosphorus recovery, and mud is back to main reactor 1.The device for separating mud and water material is non-woven fabrics.
Adopt the active sludge of sewage work to be seed sludge and to tame cultivation.
Reactor adopts the SBR operation in the domestication process, and the cycle of operation is 4 cycles/day, and weekly 6 hours phases, COD control formally starts reactor with the mud access after domestication is finished in the back water of at every turn intaking about 200mg/L.
The operation process of above-mentioned reactor is as follows in the present embodiment: the main reactor cycle of operation is 360min, wherein flooding time 6min, anaerobism time 124min, aerobic 160min, precipitation 60min, draining 10min operation.COD is 180mg/L in the interior water of water inlet back main reactor.The secondary response device cycle of operation is 1 time/day, weekly 1 hour phase.Before aerobic section finishes, the 1L mud mixture enters the secondary response device by main reactor, by heating and temperature controlling device it is carried out heat treated, and temperature is controlled at 40-70 ℃, the back main reactor that refluxes after the mud-water separation before the main reactor aerobic section begins of reaction, solution enters the chemical precipitation pond.PH control is pressed Mg 8.6 in the chemical precipitation pond
2+: PO
4 3-For the 1.6:1 ratio adds MgCl
2In the whole service process, phosphorus removal efficient is that MLSS maintains 5200 ± 100mg/L more than 99% in the main reactor, and the phosphorus organic efficiency reaches 87% in the water inlet.
Simultaneous test:
Under the same conditions, when adopting additional carbon method operation new model to realize that phosphorus reclaims, influenced by external condition bigger because additional carbon is released phosphorus, releasing phosphorus concentration every day changes also greatly, releasing phosphorus concentration fluctuates between 200-260mg/L, and then influence the unified operation that follow-up phosphorus reclaims, add improper also cause the easily waste of carbon source and the too much generation of excess sludge by additional carbon in addition.Have and better release phosphorus stabilizer and adopt thermal treatment to release phosphorus, releasing phosphorus concentration concentrates between the 220-240mg/L, be easier to the phosphorus reclaimer operation, also avoided the inappropriate detrimentally affect that additional carbon brings that adds, in addition, the phosphorus time of releasing in the secondary response device 14 shortens to 1 hour (thermal treatment) from 3 hours (additional carbon), and this will strengthen handiness and the efficient of whole recovery technology.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. realize the method that phosphorus reclaims by thermal treatment in the enhanced biological phosphorus removal process for one kind, it comprises the steps:
(1) handles active sludge sewage according to the sequence intermittent type: the pH value that the treating method comprises aerating oxygen and regulation system under stirring condition; Described reaction raw materials is acetate;
(2) heat treatment step (1) gained mud mixture under the anaerobic condition; Carry out mud-water separation subsequently, and carry out phosphorus and reclaim.
2. the method for claim 1 is characterized in that, treating processes described in the step (1) is to control draining ratio, settling time and the cycle of operation of reaction system by time-program(me).
3. in the enhanced biological phosphorus removal process, realize the device that phosphorus reclaims by thermal treatment for one kind, comprise: the main reactor that carries out the sewage disposal of sequence intermittent activated sludge, be connected the secondary response device of heat-treating phosphorus release and reclaiming with main reactor, the time-program(me) control device that is connected with main reactor, water supply installation, water-freeing arrangement, first automatic medicine adding apparatus, whipping appts and the apparatus of oxygen supply that oxygen in the reactor is provided, the device for separating mud and water that is connected with the secondary response device, the chemical precipitation device, described chemical precipitation device also is connected with second automatic medicine adding apparatus, it is characterized in that, also comprise the heating and temperature controlling device that is connected with the secondary response device.
4. device as claimed in claim 3 is characterized in that, described secondary response device is arranged on the main reactor downstream, and its volume is 1/8 of main reactor volume.
5. device as claimed in claim 3 is characterized in that, described apparatus of oxygen supply comprises the air pump that is connected with the time-program(me) control device, be arranged on the core aeration head of inboard at the bottom of the main reactor tube, and source of the gas is transported to the core aeration head through air pump and carries out aeration; Described air pump arranged outside spinner-type flowmeter control gas velocity.
6. device as claimed in claim 3, it is characterized in that, monitoring is set in the described main reactor regulates first pH electrode of pH value, described first pH electrode is connected with first automatic medicine adding apparatus and its pH value is fed back to first automatic medicine adding apparatus, and first automatic medicine adding apparatus is adjusted dosing quantity according to the detection data of first pH electrode.
7. device as claimed in claim 3, it is characterized in that, monitoring is set in the described chemical precipitation device regulates second pH electrode of pH value, described second pH electrode is connected with second automatic medicine adding apparatus and its pH value is fed back to second automatic medicine adding apparatus, and second automatic medicine adding apparatus is adjusted dosing quantity according to the detection data of second pH electrode.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020088152A (en) * | 2001-05-17 | 2002-11-27 | 이병헌 | The Biological Nutrient Removal using SBR automatic control |
| CN103011511A (en) * | 2012-12-17 | 2013-04-03 | 中国科学技术大学苏州研究院 | System for realizing phosphorus recovery in process of enhanced biological phosphorus removal and recovery method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020088152A (en) * | 2001-05-17 | 2002-11-27 | 이병헌 | The Biological Nutrient Removal using SBR automatic control |
| CN103011511A (en) * | 2012-12-17 | 2013-04-03 | 中国科学技术大学苏州研究院 | System for realizing phosphorus recovery in process of enhanced biological phosphorus removal and recovery method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 赵庆 等: "碳源浓度对SBR法同步脱氮除磷的影响试验研究", 《西北大学学报（自然科学版）》, vol. 36, no. 4, 31 August 2006 (2006-08-31), pages 599 - 602 * |
| 项学敏 等: "加热与加酸对污泥释磷影响研究", 《大连理工大学学报》, vol. 51, no. 5, 30 September 2011 (2011-09-30), pages 631 - 632 * |
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