CN103896401A - Water treatment device for remaining sludge decrement and enhanced biological denitrification and dephosphorization and method - Google Patents
Water treatment device for remaining sludge decrement and enhanced biological denitrification and dephosphorization and method Download PDFInfo
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Abstract
The invention relates to a water treatment device for remaining sludge decrement and enhanced biological denitrification and dephosphorization. According to the water treatment device, a bioreactor is connected with a water inlet and adopts an A<2>/O-MBR (Membrane Bioreactor) process, an anaerobic tank, an anoxic tank and an aerobic-membrane bioreactor are arranged sequentially from the water inlet end, an anaerobic tank stirrer is arranged in the anaerobic tank, an anoxic tank stirrer is arranged in the anoxic tank, a membrane assembly is arranged in the aerobic-membrane bioreactor, an aerator is connected to the bottom of the membrane assembly, and a membrane outlet water suction pump is connected above the membrane assembly; remaining sludge is treated by using microwave-alkali-hydrogen peroxide, A<2>/O-MBR sludge enters a sludge conditioning tank, and then, the conditioned sludge enters a microwave reactor; the sludge treated with microwaves enters a dephosphorizing precipitation tank; a stirrer is arranged in the dephosphorizing precipitation tank, and sludge supernatant, obtained after dephosphorizing precipitation treatment, is connected to the anoxic tank of the bioreactor through a pipeline and is returned as an internal carbon source. The invention further discloses a method for treating sewage by using the water treatment device.
Description
Technical field
The invention belongs to mud, technical field of sewage, relate more specifically to the water treatment device of a kind of combination mud decrement and strengthening biological carbon and phosphorous removal efficiency.
The invention still further relates to a kind of method of utilizing said apparatus to carry out sewage disposal.
Background technology
Sewage treatment process is accompanied by two large problems: the removal of nitrogen and phosphorous nutrient and the processing of excess sludge are disposed.Along with the increasingly stringent of water quality emission standard, the emission limit of nutritive salt is more and more lower.In biological carbon and phosphorous removal process, need to consume a large amount of organism.Denitrification dephosphorization technique is as A at present
2/ O technique is often subject on the removal of nitrogen phosphorus the impact that organic concentration is sewage C/N, and in the processing of real life sewage, C/N need reach 8 and just can reach satisfied denitrification effect [Wang Xiaolian, Peng Yong attains .2009.A
2/ O method bio-denitrifying sewage dephosphorization treatment technology and application [M], Science Press .].But at present the C/N of some Regional City sewage of China is only below 6, and some local C/N is even below 3, and the shortage of C/N has directly affected denitrogenation dephosphorizing efficiency, therefore become the inevitable choice of denitrogenation to adding carbon source in sewage treatment process.
In sewage treatment process, sludge treatment disposal costs accounts for the 30-50% of sewage work's overall running cost, can reach 60%.Traditional sludge treatment also can be brought certain environmental hazard as landfill, burning etc. except payment procedure.The processing of excess sludge is disposed and is mainly minimizing, resource utilization, innoxious.The decrement of excess sludge comprises source decrement and the mud decrement based on molten born of the same parents-growth theory.The sludge yield of MBR system can reduce 28%-68%, therefore A compared with traditional technology
2/ O-MBR combination process can reach certain sludge reduction effect.The effect of utilizing the treatment solution backflow after sludge pretreatment to provide carbon source not only can reach sludge reduction for denitrification treatment process, the while also can be realized the resource utilization of mud.
Sludge pretreatment refluxes and mainly contains heat treating process, Ultrasonic treatment, ozonize method, mechanical treatment process, sludge fermentation etc. as the method for carbon source at present.Utilize prior art patent that sewage treatment plant residual mud obtains carbon source to utilize two-stage alkaline hydrolysis acidizing device as " sludge carbon source two-stage alkaline hydrolysis acidizing recovery method (application number: 200910243651) ", from excess sludge, prepare sludge carbon source, it needs two-step method, and hydraulic detention time exceedes 60h; Patent " improve the device of low carbon source biological removal of phosphorus in wastewater nitric efficiency and treatment process (application number: 201010537762) " utilizes excess sludge microwave alkaline hydrolysis to produce carbon source, and its treatment process not only needs pressurization, also needs temperature to be increased to 170 DEG C.But these methods exist that energy expenditure is large, the treatment time is long or produce the problems such as carbon source utilizability is low.Therefore, be necessary to adopt more energy-conservation effective means to carry out sludge treatment, and improve the availability of carbon source, further reduce sludge yield.
Summary of the invention
The object of this invention is to provide the water treatment device of a kind of combination mud decrement and strengthening biological carbon and phosphorous removal efficiency.
The invention still further relates to the method for utilizing said apparatus to carry out sewage disposal.
To achieve these goals, the invention provides the water treatment device of excess sludge reduction and strengthening biological carbon and phosphorous removal, comprising:
One biological reaction tank connects a water-in, this biological reaction tank is sequentially anaerobic pond, anoxic pond and aerobic-membrane biological reaction pond from one end of water-in, aerobic-membrane biological reaction is provided with membrane module in pond, and the bottom of membrane module connects an aerator, and the top of membrane module connects a film water outlet suction pump; The mud of biological reaction tank by sludge conditioning pond regulate laggard enter microwave reactor; Mud enters dephosphorization settling region and carries out chemical dephosphorization after microwave treatment.
In anaerobic pond, be provided with anaerobic pond agitator, be provided with anoxic pond agitator in anoxic pond, in dephosphorization settling tank, be provided with agitator, dephosphorization settling tank is connected to the anoxic pond of biological reaction tank by pipeline, reflux as internal carbon source.
In described water treatment device, the top of membrane module is by a capsule pressure gauge junctional membrane water outlet suction pump.
In described water treatment device, in sludge conditioning pond, be provided with pH electrode and sludge conditioning agitator.
In described water treatment device, between anoxic pond and anaerobic pond, be provided with anoxic pond and anaerobic pond and reflux; Between aerobic-membrane biological reaction pond and anoxic pond, being provided with Aerobic Pond and anoxic pond refluxes.
The method of utilizing above-mentioned water treatment device to carry out sewage disposal provided by the invention:
Sewage enters in biological reaction tank, and the excess sludge of discharging through anaerobic pond, anoxic pond, aerobic-membrane biological reaction pond enters the pH value of sludge conditioning pond adjusting excess sludge;
Mud after adjusting pH value enters microwave reactor and carries out microwave-hydrogen peroxide treatment, supernatant liquor after treatment enters dephosphorization settling region, utilize chemical precipitation method to remove the phosphorus in supernatant liquor, the supernatant liquor after dephosphorization is back to the carbon source of anoxic pond as denitrogenation dephosphorizing, and throw out is discharged reaction zone.
In described method, sludge conditioning pond regulates the pH value of excess sludge by adding alkali lye, and concentration of lye is 5mol/L, regulates pH value to 10～11.
In described method, microwave-hydrogen peroxide treatment, is in 60kW microwave power radiation sample, is warming up to 80 DEG C, by H
2o
2the mass ratio of/sludge concentration=0.2 adds superoxol, continues to finish after radiant temperature to 100 DEG C.
In described method, chemical precipitation method is removed the phosphorus in supernatant liquor, is to add molysite according to the content of phosphorus in supernatant liquor according to mol ratio p:Fe=1:1.5, stirs, precipitates, and phosphoric acid salt and metal ion form precipitation and removed.
Effect of the present invention is:
1, adopt A
2/ O-MBR carries out biological denitrificaion processing, improves effluent quality and reduces sludge yield, has the feature that sludge concentration is high simultaneously, does not need separately to establish sludge concentration device, the sludge settling problem of simultaneously avoiding the poor grade of sludge settling property to cause.
2, the present invention adopts Alkaline pretreatment mud, and carries out microwave-hydrogen peroxide treatment, makes former excess sludge that molten born of the same parents occur and the macromolecular substance discharging is oxidized to small organic molecule, the availability of carbon source is improved, and further reduced sludge yield.
3, the present invention adopts chemical precipitation method to remove the phosphorus in supernatant liquor after sludge treatment, prevents it that bio-reaction system is produced and impacted.After sludge treatment, the interpolation of supernatant liquor carbon source can improve the denitrogenation dephosphorizing efficiency of reactive system, and the nitric efficiency of system and dephosphorization efficiency by using are improved respectively more than 10% and 28%.
Brief description of the drawings
Fig. 1 is A of the present invention
2the device schematic diagram of/O-MBR mud decrement and raising biological denitrificaion efficiency.
Fig. 2 is device of the present invention and common A
2the TN removal efficiency of/O-MBR reactor.Wherein, first group is that two group reaction devices all add without internal carbon source; Second group is that water treatment device of the present invention adds the internal carbon source adjusting phase; The 3rd group is that water treatment device of the present invention adds internal carbon source stationary phase.
Fig. 3 is water treatment device of the present invention and common A
2the TP of/O-MBR reactor removes situation.Wherein, first group is that two group reaction devices all add without internal carbon source; Second group is that water treatment device of the present invention adds the internal carbon source adjusting phase; The 3rd group is that water treatment device of the present invention adds internal carbon source stationary phase.
Primary clustering sign flag explanation in accompanying drawing:
1-anaerobic pond, 1.1-anaerobic pond agitator, 2-anoxic pond, 2.1-anoxic pond agitator, the aerobic MBR of 3-pond, 3.1-membrane module, 3.2-aerator, 3.3-capsule pressure gauge, 3.4-film water outlet suction pump, 4-sludge conditioning pond, 4.1-pH electrode, 4.2-sludge conditioning agitator, 5-microwave reactor, 6-dephosphorization settling tank, 6.1-agitator, 7-water inlet, 8-anoxic pond to anaerobic pond refluxes, and 9-Aerobic Pond to anoxic pond refluxes, and 10-internal carbon source refluxes.
Embodiment
The present invention, by excess sludge is processed, reclaims carbon source to improve the denitrogenation dephosphorizing processing efficiency of biological reaction tank, reaches the object of mud decrement simultaneously.
The technical solution used in the present invention is a kind of mud decrement and the combination process that improves biological denitrification dephosphorization efficiency by using, and technique comprises water technology, sludge pretreatment, the chemical precipitation dephosphorization process with denitrogenation dephosphorizing function.The device that a kind of mud decrement and raising biological denitrification dephosphorization efficiency by using are also provided simultaneously, this device comprises the membrane biological reaction pond with denitrogenation dephosphorizing function, sludge conditioning pond, microwave reaction device and chemical dephosphorization reaction tank.
Below in conjunction with drawings and Examples, treatment process and the device of a kind of mud decrement of the present invention and raising biological denitrification dephosphorization efficiency by using are illustrated.
As shown in Figure 1, the water treatment device of mud decrement and raising biological denitrification dephosphorization efficiency by using, this water treatment device comprises:
One biological reaction tank connects a water-in 7, and this biological reaction tank is sequentially anaerobic pond 1, anoxic pond 2 and aerobic-membrane biological reaction pond 3 from one end of water-in 7.The water outlet in aerobic-membrane biological reaction pond 3 connects microwave reactor 5 by sludge conditioning pond 4, and microwave reactor 5 connects dephosphorization settling tank 6.
In anaerobic pond 1, be provided with anaerobic pond agitator 1.1, in anoxic pond 2, be provided with anoxic pond agitator 2.1, in aerobic-membrane biological reaction pond 3, be provided with membrane module 3.1, the bottom of membrane module 3.1 is provided with aerator 3.2, the top of membrane module 3.1 connects a film water outlet suction pump 3.4 by a capsule pressure gauge 3.3, in sludge conditioning pond 4, be provided with pH electrode 4.1 and sludge conditioning agitator 4.2, in dephosphorization settling tank 6, be provided with agitator 6.1.
The present invention has the biological reaction tank of denitrogenation dephosphorizing function and the excess sludge of membrane bioreactor discharge enters sludge conditioning pond by pipeline, regulate excess sludge pH, then regulate mud after pH to enter by the road microwave reactor and carry out microwave-hydrogen peroxide treatment, supernatant liquor after treatment enters dephosphorization settling tank by pipeline, utilize chemical precipitation method to remove the phosphorus in supernatant liquor, then this supernatant liquor is returned to biological reaction tank by pipeline and carry out denitrogenation dephosphorizing.
Described membrane bioreactor (the A with denitrogenation dephosphorizing function
2/ O-MBR) comprise anaerobic-anoxic-oxic (A
2/ O) biological reaction tank and membrane biological reaction pond.A
2/ O-MBR refers at traditional A
2on/O technique basis, add membrane process to replace traditional second pond to reach the effect of mud-water separation.
In the present embodiment, the real life sewage (COD=155～530mg/L discharging with certain unit dependents' district; TN=48～103mg/L) as the A of experimental subjects
2/ O-MBR reactor and a large amount of residual active sludges that produce.
At A
2in/O-MBR, membrane module is placed in to Aerobic Pond, has two refluxes, Aerobic Pond mixed-liquor return is to anoxic pond, and reflux ratio is 200%, and anoxic pond is back to anaerobic pond, and reflux ratio is 100%.A
2/ O-MBR hydraulic detention time HRT is 14h, and sludge retention time SRT is 22d, and reactor cumulative volume is 58.3L.A
2/ O-MBR technique has higher sludge concentration, and sludge concentration is about 8g/L, does not therefore need to carry out extra mud and concentrates, and mud mixed liquid directly discharge enters sludge conditioning pond.
Agitator and pH electrode are set as sensor in sludge conditioning pond, add strong base solution and regulate pH constant in 10.0.Mud after pH regulator enters microwave reactor (microwave source of microwave reactor preparation 2450MHz), then in muddy water mixed solution being stirred to (mixing speed is 60rpm), open microwave reactor, muddy water mixed solution is carried out to carry out microwave radiation heating, making muddy water mixed solution be heated to temperature is 80 DEG C, close microwave source, add superoxol, the using dosage of hydrogen peroxide is according to pure hydrogen peroxide dosage conversion, add the hydrogen peroxide of 0.2 times of the quality that is equivalent to excess sludge dry weight, and then open microwave reactor mixed solution is carried out to radiant temperature to 100 DEG C, close microwave source.Under the oxygenizement of carry out microwave radiation heating and hydrogen peroxide, excess sludge has been subject to effectively cracking oxide treatment, and reaction finishes rear discharging.In the present embodiment, from mud, the organism of stripping (COD) is increased to 5965mg/L from 44mg/L, and the pH of final excess sludge becomes 7.63 from 10.
After microwave treatment mud, supernatant liquor enters dephosphorization precipitin reaction pond, and dephosphorization precipitin reaction arranges agitator in pond.Add ferrous sulfate or 2:1 using mol ratio as 1.5:1 and add magnesium chloride as precipitation agent, adjusting rotary speed is 200rpm, and after short mix 1min, 60rpm mixing 10min removes the phosphorus in supernatant liquor, precipitation 30min.After precipitation dephosphorization, the phosphorus in supernatant liquor drops to 40mg/L by original 220mg/L, and tp removal rate is about 82%, and supernatant liquor is back to A
2in the anoxic pond of/O-MBR.
Excess sludge character after alkali-microwave-hydrogen peroxide treatment is as shown in table 1.
Table 1 excess sludge is internal carbon source character after treatment
Device of the present invention is in service, and raw waste water enters anaerobic pond, and the microwave-hydrogen peroxide treatment mud supernatant liquor after dephosphorization is back to anoxic pond, carries out denitrogenation dephosphorizing.Apparatus of the present invention with without the A of microwave sludge treating system
2the contrast operation of/O-MBR device, Fig. 2 and Fig. 3 provided two group reaction devices in different steps the removal situation to TN and TP, improved respectively 10% and 28.3% for the clearance of TN and TP, mud decrement reaches more than 80%.
Claims (5)
1. a method of formulating Lakes in Nutrition thing standard, the steps include:
1) by the function of the different water bodys of survey region, water body is classified and classification, determine the nutrient concentrations upper lower limit value that survey region different grades water body is corresponding;
2) calculate nutraceutical eutrophication load in water body;
3) setting up Optimized model, is the multiple-objection optimization of target by load minimum and Economic development of eutrophication the soonest, obtains being applicable to the optimization nutrition standard value of different grades and water body purposes.
2. method according to claim 1, wherein, in step 1, water body being classified is that water body is divided into wilderness area, drinking water source ground, fish protection district, fishes and shrimps spawning ground, recreational water district, process water, shipping, flood control agricultural irrigation water and general landscape water; It is that the nutrient concentrations corresponding water body of described classification is divided into I～V level that water body is carried out to classification; Obtain the upper lower limit value of water quality standard at different levels by statistics, toxicology, ecological approach.
3. method according to claim 1 and 2, wherein, nutrition is nitrogen and phosphorus.
4. method according to claim 1, wherein, step 2 is the carrying capacity of environment metering methods that adopt based on equivalence factor, calculation formula is:
In formula
EL is carrying capacity of environment total amount;
M
jfor the amount of j pollutant of discharge, kg;
P
jbeing equivalence factor, for the size of the potentiality of pollutent to environmental influence contribution, is the relative quantity taking an object of reference as benchmark.
5. method according to claim 1, wherein, the Optimized model that step 3 is set up is:
A, economic goal:
B) control expense minimum:
B, environmental goals:
EP
tp (It)=Q
tp (I, t) × EF
tp=α
t× GDP × ai, t% × (1+b
i,t%)
n× EF
tPeP
tN (it)=Q
tN (i, t) × EF
tN=β
t× GDP × a
i,t% × (1+b
i,t%)
n× EF
tNc, constraint condition:
A) economic restriction:
B) environmental constraints:
Wherein:
F
i,t: t primary ,secondary and tertiary industries' increased value;
F
4: water pollution control expense;
QTP
t: total phosphorus enter lake total amount;
QTN
t: total nitrogen enter lake total amount;
W
i,t: t primary ,secondary and tertiary industries' sewage and sanitary sewage disposal amount;
CC
i,t: sewage treatment facility construction cost;
CO
i,t: sewage treatment facility running cost;
EPTP
i,t: the eutrophication load that total phosphorus produces:
EPTN
i,t: the eutrophication load that total nitrogen produces:
QTP
i,t: TP quantity discharged in t mono-secondary and tertiary industries or sanitary sewage;
QTN
i,t: TN quantity discharged in t mono-secondary and tertiary industries or sanitary sewage;
EF
tP: the eutrophication equivalence factor of total phosphorus;
EF
tN: the eutrophication equivalence factor of total nitrogen;
A%: t, i industry proportion in tertiary industries;
B%: t, i industrial added value propagation coefficient;
β
t: t unit's increased value total nitrogen emission factor;
P
t: t regional population sum;
M
t: the GDP per capita of the suitable local developmental level of t;
S: region nutrition benchmark;
LM: the nutrition of corresponding function of water body allows peak concentration;
DC: regional environment capacity.
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| CN104163551A (en) * | 2014-08-29 | 2014-11-26 | 成都市新筑路桥机械股份有限公司 | MUCT-MBR (Modified University of Cape Town-membrane bioreactor) combination technique for sewage treatment |
| CN104591480A (en) * | 2014-12-23 | 2015-05-06 | 南京国能环保工程有限公司 | Method for treating domestic sewage with immersed membrane reactor |
| CN105110576A (en) * | 2015-09-25 | 2015-12-02 | 哈尔滨工业大学 | A2O (anaerobic-anoxic-oxic), MBR (membrane bio-reactor) and miniature animal bio-bed set for wastewater treatment and sludge reduction and application thereof |
| CN105152495A (en) * | 2015-10-19 | 2015-12-16 | 哈尔滨工业大学 | Combined device for treating sewage and reducing sludge through ultrasonic wave, A2O and MBR and application thereof |
| CN105645711A (en) * | 2016-01-08 | 2016-06-08 | 上海电力学院 | Side-flow-type sludge in-situ reduction membrane-bioreactor system |
| CN109205785A (en) * | 2018-10-09 | 2019-01-15 | 山东建筑大学 | City domestic sewage denitrification dephosphorization system and method are strengthened in excess sludge reduction processing |
| CN111747625A (en) * | 2020-08-06 | 2020-10-09 | 安徽建筑大学 | Carbon source recovery-based municipal sludge physicochemical and biochemical combined treatment and reduction method |
| CN112520852A (en) * | 2020-04-08 | 2021-03-19 | 同济大学 | Method for removing and recovering phosphorus in sewage |
| CN112551804A (en) * | 2020-11-17 | 2021-03-26 | 博域环保技术研究院(南京)有限公司 | Intensive villages and small towns sewage ecological treatment system |
| CN118239633A (en) * | 2024-04-28 | 2024-06-25 | 广东海诚环保科技有限公司 | Method for treating cultivation wastewater |
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Cited By (13)
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| CN104163551A (en) * | 2014-08-29 | 2014-11-26 | 成都市新筑路桥机械股份有限公司 | MUCT-MBR (Modified University of Cape Town-membrane bioreactor) combination technique for sewage treatment |
| CN104163551B (en) * | 2014-08-29 | 2016-06-01 | 成都市新筑路桥机械股份有限公司 | A kind of MUCT-MBR combination process being applied to sewage disposal |
| CN104591480A (en) * | 2014-12-23 | 2015-05-06 | 南京国能环保工程有限公司 | Method for treating domestic sewage with immersed membrane reactor |
| CN105110576A (en) * | 2015-09-25 | 2015-12-02 | 哈尔滨工业大学 | A2O (anaerobic-anoxic-oxic), MBR (membrane bio-reactor) and miniature animal bio-bed set for wastewater treatment and sludge reduction and application thereof |
| CN105152495A (en) * | 2015-10-19 | 2015-12-16 | 哈尔滨工业大学 | Combined device for treating sewage and reducing sludge through ultrasonic wave, A2O and MBR and application thereof |
| CN105645711A (en) * | 2016-01-08 | 2016-06-08 | 上海电力学院 | Side-flow-type sludge in-situ reduction membrane-bioreactor system |
| CN109205785A (en) * | 2018-10-09 | 2019-01-15 | 山东建筑大学 | City domestic sewage denitrification dephosphorization system and method are strengthened in excess sludge reduction processing |
| CN109205785B (en) * | 2018-10-09 | 2024-01-30 | 山东建筑大学 | System and method for strengthening urban domestic sewage denitrification and dephosphorization by excess sludge decrement treatment |
| CN112520852A (en) * | 2020-04-08 | 2021-03-19 | 同济大学 | Method for removing and recovering phosphorus in sewage |
| CN112520852B (en) * | 2020-04-08 | 2022-06-14 | 同济大学 | Method for removing and recovering phosphorus in sewage |
| CN111747625A (en) * | 2020-08-06 | 2020-10-09 | 安徽建筑大学 | Carbon source recovery-based municipal sludge physicochemical and biochemical combined treatment and reduction method |
| CN112551804A (en) * | 2020-11-17 | 2021-03-26 | 博域环保技术研究院(南京)有限公司 | Intensive villages and small towns sewage ecological treatment system |
| CN118239633A (en) * | 2024-04-28 | 2024-06-25 | 广东海诚环保科技有限公司 | Method for treating cultivation wastewater |
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Application publication date: 20140702 |