CN109761372A - A kind of microalgae processing unit and method that sewage deep is denitrogenated - Google Patents
A kind of microalgae processing unit and method that sewage deep is denitrogenated Download PDFInfo
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- CN109761372A CN109761372A CN201910262497.7A CN201910262497A CN109761372A CN 109761372 A CN109761372 A CN 109761372A CN 201910262497 A CN201910262497 A CN 201910262497A CN 109761372 A CN109761372 A CN 109761372A
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Abstract
The present invention provides a kind of microalgae processing unit and method that sewage deep is denitrogenated, described device includes sequentially connected microdisk electrode unit and microalgae sedimentation unit；Wherein, the microdisk electrode unit includes microalgae culture pool and the first pH control equipment, and the outlet of the first pH control equipment is connected with microalgae culture pool；The microalgae sedimentation unit includes microalgae settling tank, shading device, light source and the 2nd pH control equipment, and shading device is set to the top of microalgae settling tank, and light source is set to the bottom of microalgae settling tank, and the outlet of the 2nd pH control equipment is connected with microalgae settling tank.The present invention utilizes the phototaxis of microalgae by the nitrogen in sorption enhanced sewage in microdisk electrode growth course, and the sewage quick separating by the way of light-pH combined induction by microalgae and after denitrogenating denitrogenates rear water quality up to surface water IV class standard；Described device structure is simple, and the method is easy to operate, and cost of sewage disposal is low, is that a kind of novel depth is denitrogenated and separating technology.
Description
Technical field
The invention belongs to technical field of sewage, are related to a kind of microalgae processing unit and method that sewage deep is denitrogenated.
Background technique
In recent years, with the rapid development of economy, pollution problem is also on the rise, wherein water pollution is a kind of important
Pollution form, and the major reason of water pollution is that nitrogen and phosphorus content is exceeded, Water phosphorus is excessive, will cause algae etc. in water and plants
Object fast-growth exhausts the oxygen in water, can not survive so as to cause the animal in water because oxygen is lacked, and destroys Ecology
The balance of system, while it is smelly to also result in water body nigrescence.
Municipal sewage is one of the main source of water body polluted by nitrogen, mainly includes city domestic sewage and part Industry Waste
Water.Municipal sewage plant mainly passes through activated sludge process and is removed to the pollutant in municipal sewage, mainly to dirt
COD in waterCr, the removal effect of BOD5, SS it is preferable but undesirable to the removal effect of nitrogen in sewage, direct emission still can be right
Certain influence is generated to the water environment of surrounding, is polluted.Currently, " the urban wastewater treatment that municipal wastewater treatment plant draining executes
Factory's pollutant emission standard (GB 18918-2002) " level-one A standard, but its total nitrogen (TN) content is still unable to satisfy earth's surface water ring
The requirement of IV class standard (TN≤1.5mg/L) and V class standard (TN≤2.0mg/L) in border quality standard (GB 3838-2002),
And in recent years, since urban wastewater treatment firm proposes the progress of mark retrofit work, some areas even requirement will drain main indicator
Surface water IV class standard is promoted, therefore, municipal sewage also needs progress depth to denitrogenate after Wastewater Treated by Activated Sludge Process.
Currently, sewage plant tail water, which denitrogenates common method, break point chlorination method, nitrification-denitrification method, artificial swamp method.Folding
Point chlorination is directed to be added chlorine or hypochlorous acid in sewage for the NH in sewage3- N is oxidized to N2Denitrogenate method, the disadvantage is that
Chlorine dosage is big, costly, and the by-product chloramines and chlorinatedorganic that generate during denitrogenating will cause secondary pollution；Nitre
Change-denitrification method is divided into two stages of nitrification and denitrification, before this will be nitrogenous using nitrobacteria in sewage under aerobic condition
Substance is converted into nitrate, then under anoxic conditions using denitrifying bacteria in sewage by nitrate reduction at gaseous nitrogen, reach
To the purpose denitrogenated, the disadvantages of the method are as follows needing to add a large amount of carbon source, processing cost is higher；Artificial swamp method is by wherein
Nitrogen sorption enhanced in sewage is itself component part, carbon needed for simultaneously synthesizing growth by the photosynthesis of plant and algae
Source, and the denitrifying bacteria in artificial swamp also can use the carbon source in artificial swamp and the nitrogen in sewage be reduced into nitrogen,
The disadvantages of the method are as follows construction area needed for artificial swamp is big, vulnerable to the influence of pest and disease damage, system complex, technological design difficulty compared with
It is high.
Therefore, in order to improve the efficiency that sewage is denitrogenated, processing difficulty is reduced, researcher constantly makes improvements.CN
103304093A discloses a kind of device and method of municipal wastewater advanced nitrogen dephosphorization, uses SBR and algae Photoreactor
It is coupled, municipal wastewater is after pretreatment, and into sbr reactor device intensified denitrification and dephosphorization, subsequent supernatant enters and contains algae
The further denitrogenation dephosphorizing of Photoreactor, the water outlet of the algae reactor qualified discharge after flocculation-ultrafiltration-disinfection treatment again.Institute
The photosynthesis advanced nitrogen that method utilizes algae is stated, but algae is difficult to separate with treated sewage and flocculant, also needs
Want more complicated treatment process.
In conclusion the depth of sewage plant tail water, which is denitrogenated, also needs to seek new processing unit and method, make it can not only
Reach higher nitrogen-removing rate, and subsequent separation process is relatively easy to, reduces processing cost.
Summary of the invention
In view of the problems of the existing technology, the purpose of the present invention is to provide a kind of processing of microalgae that sewage deep is denitrogenated
Device and method, the present invention utilize the light that becomes of microalgae by the nitrogen in sorption enhanced sewage in microdisk electrode growth course
Property, the sewage quick separating by microalgae and after denitrogenating denitrogenates rear water quality up to surface water IV class standard；Described device structure letter
Single, without adding carbon source in operation, cost is relatively low.
To achieve this purpose, the present invention adopts the following technical scheme:
On the one hand, the present invention provides a kind of microalgae processing unit that sewage deep is denitrogenated, described device includes successively connecting
The microdisk electrode unit and microalgae sedimentation unit connect；Wherein, the microdisk electrode unit includes microalgae culture pool and the first pH control
The outlet of control equipment, the first pH control equipment is connected with microalgae culture pool；
The microalgae sedimentation unit includes microalgae settling tank, shading device, light source and the 2nd pH control equipment, the shading
Equipment is set to the top of microalgae settling tank, and the light source is set to the bottom of microalgae settling tank, and the 2nd pH controls equipment
Outlet be connected with microalgae settling tank.
In the present invention, described device mainly consists of two parts, and microdisk electrode unit and microalgae sedimentation unit, the former is micro-
Using nitrogen as nutriment in algae growth course, it is itself composition by its sorption enhanced, reduces nitrogen content in sewage, the latter is then main
It is the phototaxis using microalgae, by the design of apparatus structure, by microalgae and denitrogenates sewage quick separating；Described device structure letter
It is single, it is easy to operate, without adding carbon source, so that the cost that sewage is denitrogenated significantly reduces.
" sewage deep is denitrogenated " in the present invention refers to sewage used in sewage treatment plant by activated sludge process
Processing, solid suspension therein, organic matter etc. have been removed, but its total nitrogen content is still unable to reach surface water IV class or V class
Standard still needs to further be denitrogenated.
In the present invention, " first ", " second " before pH control equipment are not to be intended merely to the limitation of pH control equipment
It is distinguished convenient for the pH control equipment to different units in device.
It is used as currently preferred technical solution below, but not as the limitation of technical solution provided by the invention, passes through
Following technical scheme can preferably reach and realize technical purpose and beneficial effect of the invention.
As currently preferred technical solution, the microdisk electrode unit includes the first liquid feeding pump and aeration pump, described
Microdisk electrode bottom of pond portion opens up venthole, and the aeration pump is connected by venthole with microalgae culture pool, first liquid feeding pump
It is connected by pipeline with microalgae culture pool.
Preferably, the first pH control equipment is provided with acid or alkali.
In the present invention, when microalgae carries out photosynthesis, light and carbon dioxide are needed, light source selects natural light under normal circumstances
, when without natural light, artificial light sources may be selected, illumination condition is provided；Venthole is set, air is passed through, it is raw to provide microalgae
Long required carbon dioxide.
The type of selected microalgae according to the present invention needs to maintain suitable pH environment, controls equipment by pH and trains to microalgae
Support that acid is added in pond or alkali adjusts pH, wherein selectable acid has hydrochloric acid, sulfuric acid, acetic acid etc., selectable alkali have sodium hydroxide,
The selection of calcium hydroxide etc., soda acid should not affect the growth of microalgae.
As currently preferred technical solution, the microalgae sedimentation unit includes the second liquid feeding pump and the first Pump for giving-out,
The outlet of the microalgae culture pool is connected by the second liquid feeding pump with microalgae settling tank.
Preferably, the microalgae settling tank is equipped with upper outlet and lower part outlet, the upper outlet of the microalgae settling tank
It is connected with the first Pump for giving-out.
Preferably, the 2nd pH control equipment is provided with acid or alkali.
In the present invention, solution is divided into two layers after microalgae sedimentation, and upper layer is the sewage after denitrogenating, and lower layer is precipitating algae solution, is
It is isolated out, needs to be discharged from different outlets, or go out using pumping.
Similarly, it is indicated before liquid feeding pump with " first ", " second ", is not the limitation to liquid feeding pump, simply facilitates to dress
The liquid feeding pump for setting middle different units distinguishes.
As currently preferred technical solution, described device further includes microalgae enrichment unit, the microalgae enrichment unit
Including the second Pump for giving-out and equipment for separating liquid from solid, the lower part outlet of the microalgae settling tank by the second Pump for giving-out and is separated by solid-liquid separation
Device is connected.
Preferably, the equipment for separating liquid from solid includes centrifuge.
In the present invention, the precipitating algae solution obtained after microalgae sedimentation also needs to carry out enrichment processing in order to better use,
The concentration of microalgae is further increased, protein, the fat content of microalgae are high, have very high industrial application value.
On the other hand, the method that sewage deep is denitrogenated is carried out using above-mentioned microalgae processing unit the present invention provides a kind of,
The described method includes:
(1) sewage and microalgae are added into microalgae culture pool, microalgae is grown under illumination effect, by the nitrogen in sewage
Sorption enhanced；
(2) after regulating step (1) processing sewage pH value, under the inducing action of light source, microalgae is to microalgae settling tank bottom
Portion's sedimentation obtains precipitating algae solution and denitrogenates sewage.
As currently preferred technical solution, step (1) sewage be sewage treatment plant in through activated sludge process at
Sewage after reason.
Preferably, the total nitrogen content of step (1) described sewage is 15~30mg/L, such as 15mg/L, 18mg/L, 20mg/
L, 24mg/L, 27mg/L or 30mg/L etc., it is not limited to cited numerical value, other interior unlisted numbers of the numberical range
It is worth equally applicable.
Sewage used in the present invention passes through Wastewater Treated by Activated Sludge Process in sewage treatment plant, and solid therein suspends
Object, organic matter etc. have been removed, but its total nitrogen content is still unable to reach surface water IV class or V class standard, still need to carry out denitrogenating place
Reason.
Preferably, step (1) described microalgae includes photosynthetic microalgae flora, and the microalgae flora is to obtain from natural river system
It obtains and passes through the mixing microalgae flora of domestication in laboratory.
Preferably, step (1) illumination is provided by lamp or artificial light sources.
As currently preferred technical solution, in step (1) sewage disposal process, acid or alkali is added to microalgae culture pool
Adjust pH.
Preferably, the pH of step (1) described sewage controls equipment by the first pH to adjust.
Preferably, the pH of step (1) described sewage is maintained 3~9, such as 3,4,5,6,7,8 or 9 etc., but simultaneously not only limits
It is equally applicable in other unlisted numerical value in cited numerical value, the numberical range, preferably 5~8, further preferably 6
~7.
Microalgae used in the present invention can show strong phototaxis, therefore, microdisk electrode in environment of the pH greater than 9
To be uniformly distributed it in pond, pH maintains 9 hereinafter, but also unsuitable growth that is too low and influencing microalgae.
Preferably, in step (1) sewage disposal process, air is passed through into microalgae culture pool.
Preferably, the hydraulic detention time of step (1) described microalgae culture pool be 12~48h, such as 12h, 18h, for 24 hours,
30h, 36h, 42h or 48h etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are same
It is applicable in, preferably 18~36h, further preferably 20~28h.
In the present invention, microalgae culture pool is continuous system, according to factors such as the nitrogen content of sewage, the content of microalgae and activity
It is comprehensive to determine its hydraulic detention time.The present invention carries out sewage using the photosynthesis of microalgae and denitrogenates, without adding any carbon source,
Significantly reduce operating cost.
As currently preferred technical solution, the concentration of microalgae is 0.1~0.3g/ in step (1) treated sewage
L, such as 0.1g/L, 0.12g/L, 0.15g/L, 0.18g/L, 0.2g/L, 0.24g/L, 0.27g/L or 0.3g/L etc., but not
It is only limitted to cited numerical value, other unlisted numerical value are equally applicable in the numberical range.
Preferably, after sewage enters microalgae settling tank after step (1) processing, acid is added or alkali adjusts pH.
Preferably, the pH in step (2) the microalgae settling tank controls equipment by the 2nd pH to adjust.
Preferably, in step (2) the microalgae settling tank pH control be 9~10.5, such as 9,9.2,9.5,9.8,10,
10.2 or 10.5 etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally applicable, excellent
It is selected as 9~10.
As described above, microalgae used in the present invention can show strong phototaxis in environment of the pH greater than 9, because
This, will make full use of this characteristic in microalgae settling tank, adjust pH value and be greater than 9, assemble microalgae, thus by its with remove
Sewage quick separating after nitrogen may be such that eucaryotic cell structure is destroyed, lose phototaxis if pH value is excessively high to damage microalgae
And influence sedimentation separation, also can avoid because denitrogenate sewage alkalinity it is too strong due to also need subsequent processing.
Preferably, shading device is installed at the top of step (2) the microalgae settling tank, and light source is installed in bottom.
Preferably, the hydraulic detention time of step (2) the microalgae settling tank be 1~5h, such as 1h, 1.5h, 2h,
2.5h, 3h, 3.5h, 4h, 4.5h or 5h etc., it is not limited to cited numerical value, other are unlisted in the numberical range
Numerical value is equally applicable, preferably 2~4h.
Preferably, step (2) it is described precipitating algae solution hydraulic detention time be 2~6h, such as 2h, 2.5h, 3h, 3.5h,
4h, 4.5h, 5h, 5.5h or 6h etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are same
Sample is applicable in, preferably 3~5h.
Preferably, the concentration of microalgae is 1~2g/L, such as 1g/L, 1.2g/L, 1.4g/ in step (2) the precipitating algae solution
L, 1.6g/L, 1.8g/L or 2g/L etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range
It is equally applicable.
In the present invention, by the combined induction of light-pH, microalgae and water body realize quick separating, and microalgae is concentrated, concentration
It improves, 1~2g/L is increased to by 0.1~0.3g/L in microalgae culture pool.
Preferably, total nitrogen content in sewage is denitrogenated described in step (2) is not more than 1.5mg/L, such as 1.5mg/L, 1.4mg/
L, 1.2mg/L, 1.0mg/L, 0.8mg/L or 0.6mg/L etc., it is not limited to cited numerical value, in the numberical range its
His unlisted numerical value is equally applicable.
In the present invention, treated, and sewage nitrogen content is lower, is lower than 1.5mg/L, has reached grass root's IV class standard, locates
It is good to manage effect.
As currently preferred technical solution, continues to be enriched with after step (2) the precipitating algae solution extraction, obtain micro-
Algae pregnant solution.
Preferably, the enrichment mode is to carry out centrifugal treating using centrifuge.
Preferably, the acentric factor of the centrifuge be 100~1000G, such as 100G, 200G, 300G, 400G, 500G,
600G, 700G, 800G or 1000G etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range
It is equally applicable, preferably 200~700G.
Preferably, the time of the centrifugal treating be 0.5~10min, such as 0.5min, 1min, 2min, 4min, 6min,
8min or 10min etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally applicable,
Preferably 2~6min.
Preferably, the solid content of the microalgae pregnant solution be 10~30wt%, such as 10wt%, 12wt%, 15wt%,
18wt%, 20wt%, 24wt%, 27wt% or 30wt% etc., it is not limited to cited numerical value, in the numberical range its
His unlisted numerical value is equally applicable.
As currently preferred technical solution, which comprises
(1) be added sewage and microalgae after Wastewater Treated by Activated Sludge Process to microalgae culture pool, microalgae under illumination effect into
Row growth during processing by the pH of sewage control between 3~9, while training the nitrogen sorption enhanced in sewage to microalgae
It supports and is passed through air in pond, the hydraulic detention time of microalgae culture pool is 12~48h；
(2) concentration of microalgae is 0.1~0.3g/L in sewage after step (1) processing, and into after microalgae settling tank, control is dirty
The pH value of water is 9~10.5, and shading device is installed at the top of microalgae settling tank, under the inducing action of bottom light source, microalgae to
Microalgae settles bottom of pond portion sedimentation, and the hydraulic detention time of microalgae settling tank is 1~5h, obtains precipitating algae solution and denitrogenates sewage, sinks
The hydraulic detention time of shallow lake algae solution is 2~6h, and the concentration for precipitating microalgae in algae solution is 1~2g/L, denitrogenates total nitrogen content in sewage
No more than 1.5mg/L；
(3) continue to be enriched with after extracting the precipitating algae solution that step (2) obtains out, enrichment mode is to carry out using centrifuge
Centrifugal treating, the acentric factor of centrifuge are 100~1000G, and the time of centrifugal treating is 0.5~10min, and obtained microalgae is rich
The solid content of liquid collecting is 10~30wt%.
Compared with prior art, the invention has the following advantages:
(1) present invention denitrogenates sewage progress depth using the photosynthesis of microalgae, any without adding in treatment process
Carbon source, can by treated, sewage mentioned marks the IV class standard into water environment quality standard, nitrogen content is down to 1.5mg/L
Below；
(2) present invention utilizes the phototaxis of microalgae, settles microalgae by the way of light-pH combined induction, can quickly pass through
Ji separates microalgae from water body, and separate mode is simple, the industrial value with higher of the microalgae after separation；
(3) apparatus structure of the present invention is simple, and the method is easy to operate, and therefore, operating cost is low, easy to maintain,
It is that a kind of novel depth is denitrogenated and separating technology.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the microalgae processing unit that the sewage deep that the embodiment of the present invention 1 provides is denitrogenated；
Wherein, the first liquid feeding pump of 1-, the first pH of 2- control equipment, 3- microalgae culture pool, 4- venthole, 5- aeration pump, 6-
Second liquid feeding pump, the 2nd pH of 7- control equipment, 8- microalgae settling tank, 9- shading device, 10- light source, the first Pump for giving-out of 11-, 12-
Second Pump for giving-out, 13- equipment for separating liquid from solid.
Specific embodiment
In order to better illustrate the present invention, be easy to understand technical solution, below the present invention is described in more detail.But it is following
Embodiment be only simple example of the invention, represent or limit the scope of the present invention, the present invention protect model
It encloses and is subject to claims.
Specific embodiment of the invention part provides a kind of microalgae processing unit and method that sewage deep is denitrogenated, described
Device includes sequentially connected microdisk electrode unit and microalgae sedimentation unit；
Wherein, the microdisk electrode unit includes microalgae culture pool 3 and the first pH control equipment 2, and the first pH controls equipment 2
Outlet be connected with microalgae culture pool 3；The microalgae sedimentation unit includes microalgae settling tank 8, shading device 9, light source 10 and
Two pH control equipment 7, and the shading device 9 is set to the top of microalgae settling tank 8, and the light source 10 is set to microalgae settling tank
The outlet of 8 bottom, the 2nd pH control equipment 7 is connected with microalgae settling tank 8.
The described method includes:
(1) sewage and microalgae are added into microalgae culture pool 3, microalgae is grown under illumination effect, will be in sewage
Nitrogen sorption enhanced；
(2) after regulating step (1) processing sewage pH value, under the inducing action of light source, microalgae is to 8 bottom of microalgae settling tank
Portion's sedimentation obtains precipitating algae solution and denitrogenates sewage.
The following are typical but non-limiting embodiments of the invention:
Embodiment 1:
A kind of microalgae processing unit that sewage deep is denitrogenated is present embodiments provided, the structural schematic diagram of described device is as schemed
Shown in 1, including sequentially connected microdisk electrode unit and microalgae sedimentation unit；
Wherein, the microdisk electrode unit includes microalgae culture pool 3 and the first pH control equipment 2, and the first pH controls equipment 2
Outlet be connected with microalgae culture pool 3；The microalgae sedimentation unit includes microalgae settling tank 8, shading device 9, light source 10 and
Two pH control equipment 7, and the shading device 9 is set to the top of microalgae settling tank 8, and the light source 10 is set to microalgae settling tank
The outlet of 8 bottom, the 2nd pH control equipment 7 is connected with microalgae settling tank 8.
The microdisk electrode unit further includes the first liquid feeding pump 1 and aeration pump 5, and 3 bottom of microalgae culture pool opens up logical
Stomata 4, the aeration pump 5 are connected by venthole 4 with microalgae culture pool 3, and first liquid feeding pump 1 is trained by pipeline and microalgae
Pond 3 is supported to be connected.
The microalgae sedimentation unit further includes the second liquid feeding pump 6 and the first Pump for giving-out 11, the outlet of the microalgae culture pool 3
It is connected by the second liquid feeding pump 6 with microalgae settling tank 8；The microalgae settling tank 8 is equipped with upper outlet and lower part outlet, described micro-
The upper outlet of algae settling tank is connected with the first Pump for giving-out 11.
Described device further includes microalgae enrichment unit, and the microalgae enrichment unit includes the second Pump for giving-out 12 and is separated by solid-liquid separation
The lower part outlet of device 13, the microalgae settling tank 8 is connected by the second Pump for giving-out 12 with equipment for separating liquid from solid 13；The solid-liquid
Separator 13 is centrifuge.
Embodiment 2:
A kind of Treatment method of microalgae that sewage deep is denitrogenated is present embodiments provided, the method is using in embodiment 1
Device carries out, comprising the following steps:
(1) sewage and microalgae after Wastewater Treated by Activated Sludge Process, the total nitrogen content of the sewage is added to microalgae culture pool 3
For 20mg/L, microalgae is grown under illumination effect, by the nitrogen sorption enhanced in sewage, during processing by the pH of sewage
Control is 6 or so, while air is passed through into microalgae culture pool 3, and the hydraulic detention time of microalgae culture pool 3 is 28h；
(2) concentration of microalgae is that 0.2g/L controls sewage into after microalgae settling tank 8 in sewage after step (1) processing
PH value is 9.5, and shading device 9 is installed at the top of microalgae settling tank 8, and under the inducing action of bottom light source 10, microalgae is to microalgae
The sedimentation of 8 bottom of settling tank, the hydraulic detention time of microalgae settling tank 8 are 3h, obtain precipitating algae solution and denitrogenate sewage, precipitate algae solution
Hydraulic detention time be 4h, precipitate algae solution in microalgae concentration be 1.5g/L, denitrogenate total nitrogen content in sewage and be not more than
1.5mg/L；
(3) continue to be enriched with after extracting the precipitating algae solution that step (2) obtains out, enrichment mode is to carry out using centrifuge
Centrifugal treating, the acentric factor of centrifuge are 500G, and the time of centrifugal treating is 5min, the solid content of obtained microalgae pregnant solution
For 20wt%.
In the present embodiment, for sewage after microalgae processing, separation, total nitrogen content is only 1.2mg/L, reaches surface water environment matter
IV class standard in amount standard；Without adding carbon source in treatment process, microalgae and water body separating rate are fast, and processing cost reduces.
Embodiment 3:
A kind of Treatment method of microalgae that sewage deep is denitrogenated is present embodiments provided, the method is using in embodiment 1
Device carries out, comprising the following steps:
(1) sewage and microalgae after Wastewater Treated by Activated Sludge Process, the total nitrogen content of the sewage is added to microalgae culture pool 3
For 15mg/L, microalgae is grown under illumination effect, by the nitrogen sorption enhanced in sewage, during processing by the pH of sewage
Control is 3 or so, while air is passed through into microalgae culture pool 3, and the hydraulic detention time of microalgae culture pool 3 is 18h；
(2) concentration of microalgae is that 0.1g/L controls sewage into after microalgae settling tank 8 in sewage after step (1) processing
PH value is 10.5, and shading device 9 is installed at the top of microalgae settling tank 8, and under the inducing action of bottom light source 10, microalgae is to microalgae
The sedimentation of 8 bottom of settling tank, the hydraulic detention time of microalgae settling tank 8 are 1h, obtain precipitating algae solution and denitrogenate sewage, precipitate algae solution
Hydraulic detention time be 2h, the concentration for precipitating microalgae in algae solution is 1g/L, denitrogenates in sewage total nitrogen content and is not more than 1.5mg/
L；
(3) continue to be enriched with after extracting the precipitating algae solution that step (2) obtains out, enrichment mode is to carry out using centrifuge
Centrifugal treating, the acentric factor of centrifuge are 1000G, and the time of centrifugal treating is 1min, and containing for obtained microalgae pregnant solution is solid
Rate is 10wt%.
In the present embodiment, for sewage after microalgae processing, separation, total nitrogen content is only 1.0mg/L, reaches surface water environment matter
IV class standard in amount standard；Without adding carbon source in treatment process, microalgae and water body separating rate are fast, and processing cost reduces.
Embodiment 4:
A kind of Treatment method of microalgae that sewage deep is denitrogenated is present embodiments provided, the method is using in embodiment 1
Device carries out, comprising the following steps:
(1) sewage and microalgae after Wastewater Treated by Activated Sludge Process, the total nitrogen content of the sewage is added to microalgae culture pool 3
For 30mg/L, microalgae is grown under illumination effect, by the nitrogen sorption enhanced in sewage, during processing by the pH of sewage
Control is 8 or so, while air is passed through into microalgae culture pool 3, and the hydraulic detention time of microalgae culture pool 3 is 48h；
(2) concentration of microalgae is that 0.3g/L controls sewage into after microalgae settling tank 8 in sewage after step (1) processing
PH value is 9, and shading device 9 is installed at the top of microalgae settling tank 8, and under the inducing action of bottom light source 10, microalgae is heavy to microalgae
The sedimentation of 8 bottom of pond is dropped, and the hydraulic detention time of microalgae settling tank 8 is 5h, obtains precipitating algae solution and denitrogenates sewage, precipitates algae solution
Hydraulic detention time is 6h, and the concentration for precipitating microalgae in algae solution is 2g/L, denitrogenates total nitrogen content in sewage and is not more than 1.5mg/L；
(3) continue to be enriched with after extracting the precipitating algae solution that step (2) obtains out, enrichment mode is to carry out using centrifuge
Centrifugal treating, the acentric factor of centrifuge are 100G, and the time of centrifugal treating is 10min, and containing for obtained microalgae pregnant solution is solid
Rate is 30wt%.
In the present embodiment, for sewage after microalgae processing, separation, total nitrogen content 1.5mg/L reaches surface water environment quality
IV class standard in standard；Without adding carbon source in treatment process, microalgae and water body separating rate are fast, and processing cost reduces.
Embodiment 5:
A kind of Treatment method of microalgae that sewage deep is denitrogenated is present embodiments provided, the method is using in embodiment 1
Device carries out, and the method is only that referring to the method in embodiment 1, difference: the pH value of control sewage is 8.5 in step (2).
In the present embodiment, for pH value when due to microalgae sedimentation less than 9, the phototaxis of microalgae is weaker at this time, rises and is gathered in light
Rate near source is slower, and the rate that microalgae is separated with water body greatly reduces, and the concentration of gained precipitating algae solution also accordingly reduces.
Embodiment 6:
A kind of Treatment method of microalgae that sewage deep is denitrogenated is present embodiments provided, the method is using in embodiment 1
Device carries out, and the method is only that referring to the method in embodiment 1, difference: the pH value of control sewage is 11 in step (2).
In the present embodiment, pH value when due to microalgae sedimentation is bigger than normal, and the eucaryotic cell structure that may cause microalgae is partially broken
Bad, the phototaxis of microalgae weakens, it is difficult to which rapid subsidence is got off to be separated with water body.
Comparative example 1:
This comparative example provides a kind of microalgae processing unit and method that sewage deep is denitrogenated, and described device is referring to embodiment
Device in 1, difference are only that: the microalgae sedimentation unit does not include shading device 9 and light source 10.
The method is only that referring to the method in embodiment 2, difference: flocculant is added in step (2) microalgae settling tank
To settle microalgae.
It in this comparative example, after microalgae handles sewage, is settled using flocculant, not only the rate of sedimentation separation is relatively implemented
It is partially slow in example, and gained precipitating algae solution is the mixture of microalgae and solid flocculation, and later separation is more difficult, meanwhile,
Solid suspension can be brought into again in treated sewage, increase treatment process.
The present invention be can be seen that with comparative example based on the above embodiments using the absorption in microdisk electrode growth course to nitrogen
The depth that conversion carries out sewage is denitrogenated, and is then utilized the phototaxis of microalgae, is settled microalgae by the way of light-pH combined induction,
It is capable of the separating microalgae from water body of fast, economical, it, can will be after processing without adding any carbon source during denitrogenating
Sewage mention and mark IV class standard into water environment quality standard, nitrogen content is down to 1.5mg/L or less；Described device structure
Simply, easy to operate, cost of sewage disposal is low.
The Applicant declares that the present invention is explained by the above embodiments detailed device and method of the invention, but the present invention
It is not limited to above-mentioned apparatus and method, that is, does not mean that the present invention must rely on above-mentioned apparatus and method and could implement.It is affiliated
Those skilled in the art are it will be clearly understood that any improvement in the present invention, equivalence replacement to apparatus of the present invention component and auxiliary
The addition of device, selection of concrete mode etc. are helped, all of which fall within the scope of protection and disclosure of the present invention.
Claims (10)
1. a kind of microalgae processing unit that sewage deep is denitrogenated, which is characterized in that described device includes sequentially connected microalgae training
Support unit and microalgae sedimentation unit；
Wherein, the microdisk electrode unit includes microalgae culture pool and the first pH control equipment, and the first pH controls the outlet of equipment
It is connected with microalgae culture pool；
The microalgae sedimentation unit includes microalgae settling tank, shading device, light source and the 2nd pH control equipment, the shading device
It is set to the top of microalgae settling tank, the light source is set to the bottom of microalgae settling tank, and the 2nd pH control equipment goes out
Mouth is connected with microalgae settling tank.
2. microalgae processing unit according to claim 1, which is characterized in that the microdisk electrode unit includes the first feed liquor
Pump and aeration pump, the microdisk electrode bottom of pond portion open up venthole, and the aeration pump is connected by venthole with microalgae culture pool,
First liquid feeding pump is connected by pipeline with microalgae culture pool；
Preferably, the first pH control equipment is provided with acid or alkali.
3. microalgae processing unit according to claim 1 or 2, which is characterized in that the microalgae sedimentation unit includes second
The outlet of liquid feeding pump and the first Pump for giving-out, the microalgae culture pool is connected by the second liquid feeding pump with microalgae settling tank；
Preferably, the microalgae settling tank is equipped with upper outlet and lower part outlet, the upper outlet of the microalgae settling tank and the
One Pump for giving-out is connected；
Preferably, the 2nd pH control equipment is provided with acid or alkali.
4. microalgae processing unit according to claim 1-3, which is characterized in that described device further includes microalgae richness
Collect unit, the microalgae enrichment unit includes the second Pump for giving-out and equipment for separating liquid from solid, the lower part outlet of the microalgae settling tank
It is connected by the second Pump for giving-out with equipment for separating liquid from solid；
Preferably, the equipment for separating liquid from solid includes centrifuge.
5. a kind of carry out the method that sewage deep is denitrogenated, spy using the described in any item microalgae processing units of claim 1-4
Sign is, which comprises
(1) sewage and microalgae are added into microalgae culture pool, microalgae is grown under illumination effect, the nitrogen in sewage is absorbed
Conversion；
(2) pH value of sewage after regulating step (1) is handled, under the inducing action of light source, microalgae is heavy to microalgae sedimentation bottom of pond portion
Drop obtains precipitating algae solution and denitrogenates sewage.
6. according to the method described in claim 5, it is characterized in that, step (1) sewage is in sewage treatment plant through activity
Sludge treated sewage；
Preferably, the total nitrogen content of step (1) described sewage is 15~30mg/L；
Preferably, step (1) described microalgae includes photosynthetic microalgae flora；
Preferably, step (1) illumination is provided by lamp or artificial light sources.
7. method according to claim 5 or 6, which is characterized in that in step (1) sewage disposal process, to microdisk electrode
Acid is added in pond or alkali adjusts pH；
Preferably, the pH of step (1) described sewage controls equipment by the first pH to adjust；
Preferably, the pH of step (1) described sewage is maintained 3~9, preferably 5~8, further preferably 6~7；
Preferably, in step (1) sewage disposal process, air is passed through into microalgae culture pool；
Preferably, the hydraulic detention time of step (1) described microalgae culture pool be 12~48h, preferably 18~36h, further
Preferably 20~28h.
8. according to the described in any item methods of claim 5-7, which is characterized in that microalgae in step (1) treated sewage
Concentration is 0.1~0.3g/L；
Preferably, after sewage enters microalgae settling tank after step (1) processing, acid is added or alkali adjusts pH；
Preferably, the pH in step (2) the microalgae settling tank controls equipment by the 2nd pH to adjust；
Preferably, the pH control in step (2) the microalgae settling tank is 9~10.5, preferably 9~10；
Preferably, shading device is installed at the top of step (2) the microalgae settling tank, and light source is installed in bottom；
Preferably, the hydraulic detention time of step (2) the microalgae settling tank is 1~5h, preferably 2~4h；
Preferably, the hydraulic detention time of step (2) the precipitating algae solution is 2~6h, preferably 3~5h；
Preferably, the concentration of microalgae is 1~2g/L in step (2) the precipitating algae solution；
Preferably, total nitrogen content in sewage is denitrogenated described in step (2) is not more than 1.5mg/L.
9. according to the described in any item methods of claim 5-8, which is characterized in that step (2) the precipitating algae solution extraction is subsequent
It is continuous to be enriched with, obtain microalgae pregnant solution；
Preferably, the enrichment mode is to carry out centrifugal treating using centrifuge；
Preferably, the acentric factor of the centrifuge is 100~1000G, preferably 200~700G；
Preferably, the time of the centrifugal treating is 0.5~10min, preferably 2~6min；
Preferably, the solid content of the microalgae pregnant solution is 10~30wt%.
10. according to the described in any item methods of claim 5-9, which is characterized in that the described method includes:
(1) sewage and microalgae after Wastewater Treated by Activated Sludge Process is added to microalgae culture pool, microalgae is given birth under illumination effect
It is long, by the nitrogen sorption enhanced in sewage, during processing by the pH control of sewage between 3~9, while to microalgae culture pool
In be passed through air, the hydraulic detention time of microalgae culture pool is 12~48h；
(2) concentration of microalgae is that 0.1~0.3g/L controls sewage into after microalgae settling tank in sewage after step (1) processing
PH value is 9~10.5, and shading device is installed at the top of microalgae settling tank, and under the inducing action of bottom light source, microalgae is to microalgae
Bottom of pond portion sedimentation is settled, the hydraulic detention time of microalgae settling tank is 1~5h, obtains precipitating algae solution and denitrogenates sewage, precipitates algae
The hydraulic detention time of liquid is 2~6h, and the concentration for precipitating microalgae in algae solution is 1~2g/L, and it is little to denitrogenate total nitrogen content in sewage
In 1.5mg/L；
(3) continue to be enriched with after extracting the precipitating algae solution that step (2) obtains out, enrichment mode is to be centrifuged using centrifuge
Processing, the acentric factor of centrifuge are 100~1000G, and the time of centrifugal treating is 0.5~10min, obtained microalgae pregnant solution
Solid content be 10~30wt%.
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| CN111087126A (en) * | 2019-12-17 | 2020-05-01 | 安徽大学 | Device for treating nitrogen and phosphorus-rich wastewater by using microalgae |
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| WO2022217674A1 (en) * | 2021-04-13 | 2022-10-20 | 山东大学 | Microalgae culture pond-artficial wetland coupling system and method for deep purification of sewage |
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| CN111087126A (en) * | 2019-12-17 | 2020-05-01 | 安徽大学 | Device for treating nitrogen and phosphorus-rich wastewater by using microalgae |
| CN111087126B (en) * | 2019-12-17 | 2022-06-07 | 安徽大学 | Device for treating nitrogen and phosphorus-rich wastewater by using microalgae |
| CN111547854A (en) * | 2020-04-13 | 2020-08-18 | 南昌航空大学 | Semi-open bioreactor for treating high-nitrogen-content wastewater through easy-to-settle algae and using method thereof |
| WO2022217674A1 (en) * | 2021-04-13 | 2022-10-20 | 山东大学 | Microalgae culture pond-artficial wetland coupling system and method for deep purification of sewage |
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Application publication date: 20190517 |