CN102491602A - Sequencing batch domestic sewage treatment method for forcibly denitrifying and dephosphorizing, and recycling phosphorus - Google Patents
Sequencing batch domestic sewage treatment method for forcibly denitrifying and dephosphorizing, and recycling phosphorus Download PDFInfo
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- CN102491602A CN102491602A CN2011104318024A CN201110431802A CN102491602A CN 102491602 A CN102491602 A CN 102491602A CN 2011104318024 A CN2011104318024 A CN 2011104318024A CN 201110431802 A CN201110431802 A CN 201110431802A CN 102491602 A CN102491602 A CN 102491602A
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Abstract
The invention discloses a sequencing batch domestic sewage treatment method for forcibly denitrifying and dephosphorizing, and recycling phosphorus. An induced crystallization technology is introduced into a dual-sludge denitrification and dephosphorization process, and an intermittent sequencing batch running mode is adopted, so that a sewage denitrification and dephosphorization effect is enhanced, and phosphorus resources in the sewage are recycled; therefore, the total phosphorus content in the drained water (0.5mg/L) can directly meet the first-level A standard in the Urban Sewage Treatment Plant Emissions Standards without deep treatment.
Description
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Technical field
The invention belongs to the environmental wastewater process field, reclaim the domestic sewage processing method of phosphorus when relating in particular to denitrogenation dephosphorizing.
Background technology
At present, traditional town sewage biological dephosphorize denitrification technology is (like A
2/ O technology) be simpler relatively and sophisticated technology; But also there are some problems; On organic loading, mud age and carbon source demand, exist contradiction and competition like nitrifier, denitrifying bacteria and polyP bacteria, make nitrogen, phosphorus be difficult to efficient simultaneously removal the in same system.There is the scholar to propose the double sludge denitrification dephosphorization process and can solves the above-mentioned contradiction that exists in the traditional technology.Yet the ratio of nitrogen and phosphorus is difficult to satisfy just the requirement that anoxic is taken the photograph phosphorus in intaking when the double sludge denitrification dephosphorization process is faced with practical application.On the other hand, the phosphorus in the sewage is a kind of resource of preciousness, belongs to typical sedimentary type recycled material, and except birds droppings and to the fishing for of ocean fish, phosphorus is not got back to the effective way on land once more.Phosphorus ore has become one of 20 kinds of mineral products that can not satisfy by national economic development needs.
Summary of the invention
Goal of the invention: to the problem and shortage of above-mentioned existing existence; The present invention introduces the induced crystallization technology in the double sludge denitrification dephosphorization process, and adopts the operation scheme of intermittent sequence batch (to form the new enhanced dephosphorization denitrogenation and have the technology that phosphorus reclaims function concurrently.
Technical scheme: for realizing the foregoing invention purpose, the present invention adopts following technical scheme: the sequence batch (domestic sewage processing method that a kind of intensified denitrification and dephosphorization and phosphorus reclaim may further comprise the steps:
A) will intake and import in anaerobic/anoxic/aeration reactor, and mix stirrings with denitrification phosphorus-collecting mud in resting on this reactor drum, mud consumes in the sewage carbon source to carry out stopping to staticly settle 1.5 ~ 2.5h after the stirring after anaerobic phosphorus release reacts 2.0 ~ 4.0h;
B) with steps A) 10%-50% of the supernatant that obtains imports the induced crystallization column type reactor; Mix with the crystal seed aeration in resting on this reactor drum, add certain density calcium salt simultaneously, carry out the induced crystallization reaction; After carrying out 3.0 ~ 5.0h; Stop aeration, staticly settle 0.5 ~ 1.0h after, supernatant is imported nitrator;
C) with steps A) 50%-90% of the deposition supernatant that obtains imports nitrator; Mix with the nitrifying sludge aeration in resting on this reactor drum, mud with in the sewage ammonia nitrogen change into nitre nitrogen, react 6 ~ 8h after; Stop aeration and stirring, staticly settle 1.5 ~ 2.5h;
D) with step C) the deposition supernatant that obtains imports anaerobic/anoxic/aeration reactor, and rests on this
Denitrification phosphorus-collecting mud in the reactor drum mixes and stirs, and mud consumes nitrate salt and gathers phosphorus simultaneously, carry out 3.0 ~ 5.0 h after, stop to stir, start aerator and carry out aeration 0.5 h ~ 2 h further to gather phosphorus, stop aeration then, staticly settle 1.5 ~ 2.5h;
E) with step D) the deposition supernatant that obtains derives.
As preferably, steps A) water inlet described in is a town domestic sewage, and total phosphorus concentration is more than or equal to 4 mg/L, and the pH value should be 7 ~ 9, and COD should be 150 ~ 450 mg/L, and biological oxygen demand on the 5th and chemical requirement ratio should be greater than 0.3.
As preferably, step B) calcium salt described in is a calcium chloride, and the mode that adds is for adding continuously, the ratio [Ca of the phosphorus volumetric molar concentration in the calcium that adds in the crystallization post and the crystallization post
2+]/[PO
4 3-] be 0.5:1 ~ 3:1.
As preferably, step B) crystal seed described in is calcite, silica sand or Win 40350, and particle diameter is 100 orders ~ 300 orders.
As preferably; Step B) induced crystallization process is taked the form of two-stage tandem; Said two-stage tandem is provided with induced crystallization post I and induced crystallization post II; B set by step in the induced crystallization post I) induced crystallization with staticly settle completion after, again supernatant is imported induced crystallization post II repeating step B) in the induced crystallization process, obtain more high-quality calcium phosphorus xln.
As preferably; Step B) induced crystallization process is taked the form of secondary parallel connection; Said secondary parallel connection is provided with induced crystallization post I and induced crystallization post II; Said induced crystallization post I and induced crystallization post II are respectively with steps A) 5%-25% of the deposition supernatant that obtains imports the induced crystallization column type reactor, and carry out induced crystallization, thereby save reaction time.
As preferably, as step C) working time than step B) when long 2h is above, step C) with step B) carry out simultaneously, thereby save reaction time.
As preferably, all adopt time controller to realize the keying of whipping device, aerator and valve is controlled in each step, thereby realize full-range automated operation.
Beneficial effect: compared with prior art; The present invention has the following advantages: 1, be applicable to most town domestic sewage; The more common process for removing nitrogen and phosphor from sewage of removal efficiency of nitrogen and phosphorus is significantly improved; < 0.5mg/>L need not advanced treatment and can directly reach " urban wastewater treatment firm pollutant emission standard " one-level A standard the water outlet total phosphorus; 2, the phosphor resource in the recyclable sewage is realized the phosphor resource recycling.
Description of drawings
Fig. 1 is a process flow sheet of the present invention;
Fig. 2 is anaerobic/anoxic according to the invention/aeration reactor structural representation;
Fig. 3 is a nitrification tank structure of reactor synoptic diagram according to the invention;
Fig. 4 is an induced crystallization column type reactor structural representation according to the invention;
Fig. 5 is that each reactor drum according to the invention is connected synoptic diagram with equipment.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment; Further illustrate the present invention; Should understand these embodiment only be used to the present invention is described and be not used in the restriction scope of the present invention; After having read the present invention, those skilled in the art all fall within the application's accompanying claims institute restricted portion to the modification of the various equivalent form of values of the present invention.
Shown in Fig. 1 ~ 5, anaerobic/anoxic/aeration reactor 53 is provided with electric mixer 4 with the muddy water uniform mixing, and the bottom is provided with micro-hole aerator 29,29 and links to each other with gas blower 28 through tracheae; This reactor drum is provided with the water outlet 13,14,15,16,24,56 of different heights; The water outlet place is provided with valve 17,18,19,20,25,57 respectively; Four rising pipes that water outlet 13,14,15,16 connects converge into a house steward 21; Establish pump 22 on the house steward 21 and link to each other, select the supernatant of different ratioss, in the time of for example will selecting the supernatant than small proportion for use through the valve 17,18,19,20 of open and close with the water-in 23 of induced crystallization reactor drum 55; Can open valve 17 valve-offs 18,19,20; Water outlet 24 links to each other through water pipe 27 with the water-in 33 of nitrator 54, and water pipe 27 is provided with pump 26, and water outlet 56 reacts the water port after finishing for system's one-period; Be connected with water inlet manifold 8 on the water-in 10, be divided into two, arm 6 links to each other with the water outlet 35 of nitrator 54, is provided with pump 3 and valve 39 in the pipe, and another arm 5 links to each other with high-order sewage pond 52, and pipe is provided with pump 2 and valve 1; Be provided with mud discharging mouth 11 in the nearly bottom of this reactor drum, through valve 12 control discharging excess sludges;
Described nitrator 54 bottoms are provided with micro-hole aerator 36,36 and link to each other with gas blower 37 through tracheae; And be provided with water-in 33,33 and link to each other with house steward 31,31 are divided into two arms 27 and 30, are provided with pump 7 in the arm 30 and link to each other with induced crystallization reactor drum water outlet 43; Nearly bottom is provided with mud discharging mouth 34, is provided with valve 38 in the mud pipe, with the discharging excess sludge;
Described induced crystallization column type reactor 55 bottoms are reaction zone 44, and top is provided with settling region 45, and the diameter of settling region 45 is greater than the diameter of reaction zone 44; The reaction zone bottom is provided with micro-hole aerator 42,42 and links to each other with gas blower 41 through tracheae; Nearly bottom is provided with water-in 23, feeding opening 48, water outlet 43, replenishes/take out crystal seed mouth 40; Water-in 21 links to each other with anaerobic/anoxic/aeration reactor 53 water outlet house stewards 21, and water outlet 43 is connected with water pipe 30, and 30 are provided with valve 32; Between additional/40 mouthfuls of crystal seeds of taking-up and micro-hole aerator 42, be provided with screen cloth 46, to prevent crystal seed blocking aeration device, feeding opening 48 links to each other with chemical tank 51 through volume pump 50, is placed with certain density calcium chloride solution in the chemical tank 51;
Steps A realizes through following action: Open valve 1, valve 9, pump 2, the importing anaerobism of will intaking/lack
In oxygen/aeration reactor 53; Valve-off 1, valve 9 and pump 2 start whisking appliance 4, carry out 2.0 ~ 4.0h after, close whisking appliance 4, deposition leaves standstill 1.5 ~ 2.5h;
Step B realizes through following action: one of Open valve 17,18,19,20, open pump 22, just steps A) the deposition supernatant 10% ~ 50% import induced crystallization column type reactor, valve-off; The gas blower 41 of opening induced crystallization reactor drum 55 carries out aeration; In aeration carried out 3.0 ~ 5.0h, Open valve 49, pump 50 added certain density calcium salt continuously; Then valve-off 49, pump 50, gas blower 41 leave standstill about 0.5 ~ 1.0h; Open valve 32 and pump 7 import nitrator 54 with supernatant;
Step C realizes through following action: Open valve 25, pump 26, with the residue supernatant importing nitrator 54 of steps A; Valve-off 25, pump 26 start gas blower 37, carry out 6.0 ~ 8.0h nitration reaction; Then close gas blower 37, staticly settle 1.5 ~ 2.5h;
Step D realizes through following action: Open valve 39,9 and pump 3 import anaerobic/anoxic/aeration reactor 53 with supernatant; Valve-off 39,9 and pump 3 start whisking appliance 4, carry out 3.0 ~ 5.0h after, close whisking appliance 4; Then open gas blower 28 reaction 0.5 h ~ 1.5 h, close gas blower 28, staticly settle 1.5 ~ 2.5h;
Step e realizes through following action: Open valve 57, treat that supernatant drains back valve-off 57.
Regularly Open valve 12,38 is to discharge a certain amount of denitrification excess sludge, nitrated excess sludge.Regularly Open valve 47 is loaded with the crystal seed or the additional crystal seed of calcium phosphorus xln with taking-up.
Below further specify the present invention through specific embodiment:
Embodiment 1
Use this art breading simulated domestic wastewater, handling the water yield is 6.5 L, and influent quality is: COD 195.8 mgL
-1, total phosphorus 7.96 mgL
-1, total nitrogen is 32.9 mgL
-1The reaction times of anaerobism, nitrated, anoxic and aeration is respectively: 2.0 h, 6.0 h, 4.0 h and 1.0 h, the anaerobism supernatant of 1.3L get into the induced crystallization reactor drum and react.In the crystallization reactor, the calcite that with the particle diameter is 0.15mm is as crystal seed, and calcium concn is according to [Ca
2+]/[PO
4 3-] for 1:1 adds, the water outlet total phosphorus is 0.20 mgL
-1, the water outlet total nitrogen is 5.6 mgL
-1
Embodiment 2
Use this art breading simulated domestic wastewater, handling the water yield is 5 L, and influent quality is: COD 349.8 mgL
-1, total phosphorus 10.8 mgL
-1, total nitrogen is 53.3 mgL
-1The reaction times of anaerobism, nitrated, anoxic and aeration is respectively: 2.0 h, 7.0 h, 5.0 h and 1.0 h, the anaerobism supernatant of 1.0 L get into the induced crystallization reactor drum and react.In the crystallization reactor, the calcite that with the particle diameter is 0.15mm is as crystal seed, and calcium concn is according to [Ca
2+]/[PO
4 3-] for 1.67:1 adds, the water outlet total phosphorus is 0.35 mgL
-1, the water outlet total nitrogen is 9.8 mgL
-1
Use this art breading simulated domestic wastewater, handling the water yield is 6.5 L, and influent quality is: COD 271.9 mgL
-1, total phosphorus 13.9 mgL
-1, total nitrogen is 47.2 mgL
-1The reaction times of anaerobism, nitrated, anoxic and aeration is respectively: 2.0 h, 6.0 h, 5.0 h and 1.5 h, the anaerobism supernatant of 2.6 L get into the induced crystallization reactor drum and react.In the crystallization reactor, the calcite that with the particle diameter is 0.15mm is as crystal seed, and calcium concn is according to [Ca
2+]/[PO
4 3-] for 1:1 adds, the water outlet total phosphorus is 0.12 mgL
-1, the water outlet total nitrogen is 7.5 mgL
-1
Embodiment 4
Use this art breading simulated domestic wastewater, handling the water yield is 6.5 L, and influent quality is: COD 250.4 mgL
-1, total phosphorus 5.2 mgL
-1, total nitrogen is 24.6 mgL
-1The reaction times of anaerobism, nitrated, anoxic and aeration is respectively: 2.0 h, 6.0h, 3.0 h and 2.0 h, the anaerobism supernatant of 1.3 L get into the induced crystallization reactor drum and react.In the crystallization reactor, the calcite that with the particle diameter is 0.15mm is as crystal seed, and calcium concn is according to [Ca
2+]/[PO
4 3-] for 0.5:1 adds, the water outlet total phosphorus is 0.08 mgL
-1, the water outlet total nitrogen is 4.7 mgL
-1
Embodiment 5
Use this art breading simulated domestic wastewater, handling the water yield is 5 L, and influent quality is: COD 288.6 mgL
-1, total phosphorus 14.2 mgL
-1, total nitrogen is 32.8mgL
-1The reaction times of anaerobism, nitrated, anoxic and aeration is respectively: 2.0h, 6.0 h, 4.0 h and 2.0 h, the anaerobism supernatant of 2.6 L get into the induced crystallization reactor drum and react.In the crystallization reactor, the calcite that with the particle diameter is 0.15mm is as crystal seed, and calcium concn is according to [Ca
2+]/[PO
4 3-] for 1.67:1 adds, the water outlet total phosphorus is 0.37 mgL
-1, the water outlet total nitrogen is 5.9mgL
-1
Claims (8)
1. the sequence batch (domestic sewage processing method that reclaims of intensified denitrification and dephosphorization and phosphorus is characterized in that may further comprise the steps:
A) will intake and import in anaerobic/anoxic/aeration reactor, and mix stirrings with denitrification phosphorus-collecting mud in resting on this reactor drum, mud consumes in the sewage carbon source to carry out stopping to staticly settle 1.5 ~ 2.5h after the stirring after anaerobic phosphorus release reacts 2.0 ~ 4.0h;
B) with steps A) 10%-50% of the supernatant that obtains imports the induced crystallization column type reactor; Mix with the crystal seed aeration in resting on this reactor drum, add certain density calcium salt simultaneously, carry out the induced crystallization reaction; After carrying out 3.0 ~ 5.0 h; Stop aeration, staticly settle 0.5 ~ 1.0h after, supernatant is imported nitrator;
C) with steps A) 50%-90% of the deposition supernatant that obtains imports nitrator; Mix with the nitrifying sludge aeration in resting on this reactor drum, mud with in the sewage ammonia nitrogen change into nitre nitrogen, react 6.0 ~ 8.0h after; Stop aeration and stirring, staticly settle 1.5 ~ 2.5h;
D) with step C) the deposition supernatant that obtains imports anaerobic/anoxic/aeration reactor; Mix stirring with the denitrification phosphorus-collecting mud in resting on this reactor drum, mud consumes nitrate salt and gathers phosphorus simultaneously, carry out 3.0 ~ 5.0 h after; Stop to stir; Start aerator and carry out aeration 0.5 h ~ 2 h, stop aeration then, staticly settle 1.5 ~ 2.5h further to gather phosphorus;
E) with step D) the deposition supernatant that obtains derives.
2. the sequence batch (domestic sewage processing method that reclaims according to the said intensified denitrification and dephosphorization of claim 1 and phosphorus; It is characterized in that: the water inlet steps A) is a town domestic sewage; Total phosphorus concentration is more than or equal to 4 mg/L; The pH value should be 7 ~ 9, and COD should be 150 ~ 450 mg/L, and biological oxygen demand on the 5th and chemical requirement ratio should be greater than 0.3.
3. the sequence batch (domestic sewage processing method that reclaims according to the said intensified denitrification and dephosphorization of claim 1 and phosphorus; It is characterized in that: the calcium salt step B) is a calcium chloride; The mode that adds is for adding continuously, the ratio [Ca of the phosphorus volumetric molar concentration in the calcium that adds in the crystallization post and the crystallization post
2+]/[PO
4 3-] be 0.5:1 ~ 3:1.
4. according to the sequence batch (domestic sewage processing method of said intensified denitrification and dephosphorization of claim 1 and phosphorus recovery, it is characterized in that: the crystal seed step B) is calcite, silica sand or Win 40350, and particle diameter is 100 ~ 300 orders.
5. the sequence batch (domestic sewage processing method that reclaims according to the said intensified denitrification and dephosphorization of claim 1 and phosphorus; It is characterized in that: induced crystallization process step B) is taked the form of two-stage tandem; Said two-stage tandem is provided with induced crystallization post I and induced crystallization post II; B set by step in the induced crystallization post I) accomplish induced crystallization and staticly settle after, again supernatant is imported induced crystallization post II repeating step B) in the induced crystallization process, obtain more high-quality calcium phosphorus xln.
6. the sequence batch (domestic sewage processing method that reclaims according to the said intensified denitrification and dephosphorization of claim 1 and phosphorus; It is characterized in that: induced crystallization process step B) is taked the form of secondary parallel connection; Said secondary parallel connection is provided with induced crystallization post I and induced crystallization post II; Said induced crystallization post I and induced crystallization post II are respectively with steps A) 5%-25% of the deposition supernatant that obtains imports the induced crystallization column type reactor, carries out induced crystallization.
7. the sequence batch (domestic sewage processing method that reclaims according to the said intensified denitrification and dephosphorization of claim 1 and phosphorus is characterized in that: as step C) working time than step B) when long 2h is above, step C) and step B) carry out simultaneously.
8. according to the sequence batch (domestic sewage processing method of said intensified denitrification and dephosphorization of claim 1 and phosphorus recovery, it is characterized in that: all adopt time controller to realize the keying of whipping device, aerator and valve is controlled in each step.
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Cited By (6)
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| CN103723874A (en) * | 2014-01-22 | 2014-04-16 | 安徽科技学院 | Device and method for recovering phosphorus from sewage |
| CN104961305A (en) * | 2015-07-22 | 2015-10-07 | 浙江大学 | Treatment method of anaerobic fermentation liquid of livestock and poultry breeding wastewater |
| CN106430733A (en) * | 2016-11-24 | 2017-02-22 | 中国科学院生态环境研究中心 | High-hardness domestic drinking water softening device and method |
| CN106587544A (en) * | 2017-02-09 | 2017-04-26 | 山东建筑大学 | Enhanced phosphate removal and sludge reduction type sewage treatment apparatus |
| CN106810019A (en) * | 2017-02-09 | 2017-06-09 | 山东建筑大学 | A kind of reinforced phosphor-removing and sludge decrement type sewage treatment process |
| CN107698065A (en) * | 2017-11-14 | 2018-02-16 | 蚌埠市嘉实机电设备制造有限公司 | Caused dirty water purification method in a kind of production to aluminum products |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103723874A (en) * | 2014-01-22 | 2014-04-16 | 安徽科技学院 | Device and method for recovering phosphorus from sewage |
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| CN106430733A (en) * | 2016-11-24 | 2017-02-22 | 中国科学院生态环境研究中心 | High-hardness domestic drinking water softening device and method |
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| CN106810019A (en) * | 2017-02-09 | 2017-06-09 | 山东建筑大学 | A kind of reinforced phosphor-removing and sludge decrement type sewage treatment process |
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| CN106587544B (en) * | 2017-02-09 | 2023-03-14 | 山东建筑大学 | Enhanced phosphorus removal and sludge reduction type sewage treatment device |
| CN107698065A (en) * | 2017-11-14 | 2018-02-16 | 蚌埠市嘉实机电设备制造有限公司 | Caused dirty water purification method in a kind of production to aluminum products |
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Application publication date: 20120613 |
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