CN102583746A - Multi-stage anaerobic anoxic aerobic biological reaction tank - Google Patents
Multi-stage anaerobic anoxic aerobic biological reaction tank Download PDFInfo
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- CN102583746A CN102583746A CN2012100738007A CN201210073800A CN102583746A CN 102583746 A CN102583746 A CN 102583746A CN 2012100738007 A CN2012100738007 A CN 2012100738007A CN 201210073800 A CN201210073800 A CN 201210073800A CN 102583746 A CN102583746 A CN 102583746A
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Abstract
The invention relates to a multi-stage anaerobic anoxic aerobic biological reaction tank, which comprises an anaerobic tank, an anoxic tank and an aerobic tank which are arranged in the sequence of anaerobic, anoxic and aerobic and are mutually communicated, and the three tanks are respectively a single-stage anaerobic anoxic aerobic biological reaction tank. The multi-stage anaerobic anoxic aerobic biological reaction tank is characterized in that the single-stage anaerobic anoxic aerobic biological reaction tanks are connected in the water flow direction to form an M-stage anaerobic anoxic aerobic biological reaction tank. The multi-stage anaerobic anoxic aerobic biological reaction tank has the advantages of strictly executing the MAAO process flow idea, adjusting proportion of flow entering the anaerobic tank and the aerobic tank, achieving two process models with different reinforcing effects including multi-stage efficient denitrification in the mode of anoxic-aerobic-anoxic-aerobic... and multi-stage denitrification dephosphorization in the mode of anaerobic-anoxic-anaerobic-anoxic...
Description
Technical field
The present invention relates to biological tank in the sewage treatment area, particularly relate to a kind of multistage anaerobism anoxic aerobe reaction tank.
Background technology
Activated Sludge Process in the municipal sewage treatment at present; Almost all theoretical and realize based on " anaerobism, anoxic, aerobic " growth metabolism of biology; It is the pollutent such as organism, nitrogen, phosphorus in the sewage; In biological tank, under the varying environment,, realize the purpose of purifying water body through being able to removal under the microbial growth metabolism.
At traditional A
2Multi-stage anaerobic aerobic (MAO) technology of being out of shape on the O technology basis and coming; With the organism in the sewage is carbon source; Brought into play the denitrogenation ability of mikrobe to greatest extent, adapted to the characteristics of present municipal effluent low-carbon (LC)/nitrogen ratio, be difficult to ensure but its shortcoming is the effect of biological phosphate-eliminating.On this basis; The professional and technical personnel has developed multistage anaerobism anoxic aerobic (MAAO) technology; The characteristics of this technology are in same biosystem, can realize the aerobic denitrogenation of multi-stage anaerobic, can realize the dephosphorization of multistage anaerobism anoxic denitrification again; When keeping MAO technology efficient denitrification advantage, the organism in the sewage is realized efficient dephosphorization with the mode of " carbon is dual-purpose ".
The MAAO processing requirement, except common process need satisfy that civil engineering, equipment are installed, operational management convenient, in the technical process practical implementation, again the water yield is distributed and flows to aspect such as switching to have proposed higher technical requirements.According to the current design concept of conventional biological reaction tank, for realizing above-mentioned purpose, certainly will increase a large amount of connecting pipelines or hydraulic set, construction investment or working cost are difficult to reduce.
Summary of the invention
The present invention is in order to overcome deficiency of the prior art; A kind of multistage anaerobism anoxic aerobe reaction tank is provided; Purpose is to meet multistage anaerobism anoxic aerobic (MAAO) Activated Sludge Process, promptly can strictly carry out the MAAO technical process, can satisfy the construction requirement that construction investment is little, running cost is low again; Arrange and the assignment of traffic mode through rational functional zone, realize the target of MAAO technology.Promptly; In same biological reaction tank; There are adjustable " anaerobic-aerobic-anaerobic-aerobic ... " multi-stage, efficient denitrification process and " anaerobic-anoxic-anaerobic-anoxic ... " multistage denitrification dephosphorization process; And can carry out the assignment of traffic regulation and control targetedly according to the water quality situation, adjustment main technique route throughput ratio, the processing requirement of realization reinforced phosphor-removing or strengthened denitrification.
The present invention is for realizing above-mentioned purpose; Realize through following technical scheme; A kind of multistage anaerobism anoxic aerobe reaction tank; Comprise that an anaerobic pond, anoxic pond and Aerobic Pond are successively according to anaerobic-anoxic-aerobic series arrangement and the single-stage anaerobism anoxic aerobe reaction tank that is interconnected; It is characterized in that: said single-stage anaerobism anoxic aerobe reaction tank connects and composes M level anaerobism anoxic aerobe reaction tank along water (flow) direction, and the said the 1st Aerobic Pond head end to (M-1) level is respectively equipped with the anoxic flow-guiding mouth, and said anoxic flow-guiding mouth is provided with the branch flow modulation device; The tail end of said anoxic pond at the corresponding levels is communicated with Aerobic Pond head end at the corresponding levels through the anoxic flow-guiding mouth, and the tail end of said anoxic pond at the corresponding levels anoxic transition canal through being arranged on Aerobic Pond side at the corresponding levels again is communicated with subordinate anaerobic pond head end; The said the 1st Aerobic Pond tail end to (M-1) level is respectively equipped with aerobic transition canal; The 1st anaerobic pond tail end to (M-1) level is respectively equipped with the anaerobic diversion mouth; Said Aerobic Pond tail end at the corresponding levels links to each other with subordinate anoxic pond head end through aerobic transition canal, and the said the 1st anaerobic pond tail end to (M-1) level links to each other with this grade anoxic pond head end through the anaerobic diversion mouth.
Progression M >=2 of said M level anaerobism anoxic aerobe reaction tank.
Aerobic Pond head end in the said M level anaerobism anoxic aerobe reaction tank is provided with the anoxic flow-guiding mouth, and the anoxic pond of the said corresponding levels is communicated with Aerobic Pond through the anoxic flow-guiding mouth, and said Aerobic Pond tail end is communicated with water outlet through effluent weir.
One side pool wall of said multistage anaerobism anoxic aerobe reaction tank is provided with inlet channel; Inlet channel is provided with water-distributing gap; The opposite side and the upside of multistage anaerobism anoxic aerobe reaction tank are provided with the returned sluge canal; The returned sluge canal is provided with joins the mud mouth, and said water-distributing gap quantity is identical with the combination progression M of single-stage anaerobism anoxic aerobe reaction tank, and corresponding with anaerobic pond head ends at different levels; Joining mud mouth quantity is two, and the head end with the anaerobic pond of first step anaerobism anoxic aerobe reaction tank and anoxic pond is corresponding respectively.The pond length of said multistage anaerobism anoxic aerobe reaction tank equals M level anaerobism anoxic aerobe reaction tank width sum, the equal in length of pond anaerobic ponds wide and at different levels, anoxic pond, Aerobic Pond.
Beneficial effect: the strict MAAO technical process theory of carrying out; Through at different levels minutes flow modulation devices; Regulate the flow proportional that gets into anaerobic pond and Aerobic Pond, realize the technology pattern of the denitrogenation of " anaerobic-aerobic-anaerobic-aerobic ... " multi-stage, efficient and two kinds of different strengthening effects of " anaerobic-anoxic-anaerobic-anoxic ... " multistage denitrification dephosphorization.This biological reaction tank smooth process flow, function division is scientific and reasonable, and assignment of traffic transition routes at different levels are clear and definite, easy to adjust; Hydraulic loss is little, and no internal reflux equipment through multistage water distribution, improves sludge concentration; Fully save carbon source, realize " carbon is dual-purpose ", reduce running cost.Adopt no internal reflux technology, realize the controlled target of reinforced phosphor-removing and strengthened denitrification through regulating flow ratios at different levels.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is relationship model figure;
Fig. 3 is a TN Inlet and outlet water graphic representation;
Fig. 4 is a TP Inlet and outlet water graphic representation.
Among the figure: 1 inlet channel, 2 anoxic transition canals, 3AAO combination, 4 water-distributing gaps, 5 fens flow modulation devices, 6 anoxic flow-guiding mouths; 7 pool walls, 8 returned sluge canals, 9 join the mud mouth, 10 aerobic transition canals, 11 anaerobic ponds; 12 anoxic pond, 13 Aerobic Ponds, 14 partition walls, 15 anaerobic diversion mouths, 16 effluent weirs.
Embodiment
Below in conjunction with preferred embodiment; To details are as follows according to embodiment provided by the invention: see accompanying drawing for details; A kind of multistage anaerobism anoxic aerobe reaction tank; Comprise that an anaerobic pond, anoxic pond and Aerobic Pond are successively according to anaerobic-anoxic-aerobic series arrangement and the single-stage anaerobism anoxic aerobe reaction tank that is interconnected; Said single-stage anaerobism anoxic aerobe reaction tank connects and composes M level anaerobism anoxic aerobe reaction tank along water (flow) direction, and the said the 1st Aerobic Pond head end to (M-1) level is respectively equipped with the anoxic flow-guiding mouth, and said anoxic flow-guiding mouth is provided with the branch flow modulation device; The tail end of said anoxic pond at the corresponding levels is communicated with Aerobic Pond head end at the corresponding levels through the anoxic flow-guiding mouth, and the tail end of said anoxic pond at the corresponding levels anoxic transition canal through being arranged on Aerobic Pond side at the corresponding levels again is communicated with subordinate anaerobic pond head end; The said the 1st Aerobic Pond tail end to (M-1) level is respectively equipped with aerobic transition canal; The 1st anaerobic pond tail end to (M-1) level is respectively equipped with the anaerobic diversion mouth; Said Aerobic Pond tail end at the corresponding levels links to each other with subordinate anoxic pond head end through aerobic transition canal, and the said the 1st anaerobic pond tail end to (M-1) level links to each other with this grade anoxic pond head end through the anaerobic diversion mouth.One side pool wall of said multistage anaerobism anoxic aerobe reaction tank is provided with inlet channel; Inlet channel is provided with water-distributing gap; The opposite side and the upside of multistage anaerobism anoxic aerobe reaction tank are provided with the returned sluge canal; The returned sluge canal is provided with joins the mud mouth, and said water-distributing gap quantity is identical with the combination progression M of single-stage anaerobism anoxic aerobe reaction tank, and corresponding with anaerobic pond head ends at different levels; Joining mud mouth quantity is two, and the head end with the anaerobic pond of first step anaerobism anoxic aerobe reaction tank and anoxic pond is corresponding respectively.The pond length of said multistage anaerobism anoxic aerobe reaction tank equals M level anaerobism anoxic aerobe reaction tank width sum, the equal in length of pond anaerobic ponds wide and at different levels, anoxic pond, Aerobic Pond.
With level Four (M=4) anaerobism anoxic aerobe reaction tank is example:
Multistage anaerobism anoxic aerobic (MAAO) biological reaction tank integral body is divided into identical single-stage anaerobism anoxic aerobe reaction tank (AAO) combination 3 of level Four; Every grade of AAO combination 3 is by an anaerobic pond 11; An anoxic pond 12 and an Aerobic Pond 13 consist of functional zone, are separated by partition wall 14 between each functional zone.AAO combinations 3 at different levels ensure that along the series connection of current technical process direction the waterpower fluidised form is the plug-flow state in the biological reaction tank.
In multistage anaerobism anoxic aerobe reaction tank one side inlet channel 1 is set, inlet channel 1 leans on a side of biological tank that water-distributing gap 4 is set.The quantity of water-distributing gap 4 is identical with the progression of AAO combination 3, and the position of water-distributing gap 4 is corresponding with the head end axis of anaerobic pond 11 in the AAO combinations 3 at different levels.Water-distributing gap 4 places are provided with the branch flow modulation device, i.e. checkgate or water dispensing valve are allocated sewage into anaerobic pond 11 head ends of said biological reaction tank.
In multistage anaerobism anoxic aerobe reaction tank opposite side and inlet channel 1 symmetry and a vertical side,
Returned sluge canal 8 is set, and returned sluge canal 8 is provided with 2 near biological tank one side and joins mud mouth 9, and its position is respectively anaerobic pond 11 head ends and anoxic pond 12 head ends of first step AAO combination 3.
Anoxic flow-guiding mouth 6 and anaerobic diversion mouth 15 are employed in the mode that punches on the partition wall 14 and carry out the waterpower water conservancy diversion, do not destroy the mechanical structure of partition wall 14 and biological tank pool wall 7.
The anaerobic pond 11 of single-stage anaerobism anoxic aerobe reaction tank; The length of anoxic pond 12 and Aerobic Pond 13 equates with multistage anaerobism anoxic aerobe reaction tank width; Anaerobic ponds 11 at different levels, the width summation and the biological reaction tank equal in length of anoxic pond 12 and Aerobic Pond 13.
Principle of work:
After some returned sluge of anaerobic pond head end of first step anaerobism anoxic aerobe reaction tank and a part of former water mix; Pass through anaerobic reaction again; Flow into first step anoxic pond; All the other anaerobic ponds at different levels are allocated into partial raw water and upper level anoxic pond in proportion by inlet channel partially mixed liquid through anaerobic reaction, flows into anoxic pond after being got into the anaerobic pond head end simultaneously and mixed by anoxic transition canal again;
First step anoxic pond head end is mixed by terminal mixed solution of anaerobic pond and partial reflux mud; Through behind the hypoxia response; Be divided into two parts by a certain percentage at its end; A part flows into the next stage anaerobic pond by anoxic transition canal, and another part flows into Aerobic Pond, and anoxic transition canal and anoxic flow-guiding mouth can be side by side or be stratified and set on head end one side of Aerobic Ponds at different levels up and down;
The Aerobic Pond head end of the first step and (M-1) level; Partially mixed flow by anoxic pond is terminal is gone into; Behind the aeration aerobic reaction, flow into the next stage anoxic pond by aerobic transition canal, aerobic transition canal and anaerobic diversion mouth can be side by side or are stratified and set on end one side of next stage anaerobic pond up and down; The last level (M level) Aerobic Pond head end is not provided with anoxic transition canal, and the end end sets out mill weir;
The discharge relation of (is example with the level Four) multistage anaerobism anoxic aerobe reaction tank satisfies:
Two, three grades of AAO combinations, anoxic pond flow Q at the corresponding levels
A '=anaerobic pond flow Q at the corresponding levels
A+ higher level Aerobic Pond flow Q
O-=Aerobic Pond flow Q at the corresponding levels
OThe anaerobic pond flow Q of+subordinate
A+The water distribution quantity Q of-subordinate
W+
In the first step AAO combination, anaerobic pond flow Q at the corresponding levels
A1=first step water distribution quantity Q
W1+ first step anaerobic pond head end is joined mud amount Q
S1=first step anoxic pond flow Q
A1 '-first step anoxic pond head end is joined mud amount Q
S2
In the last step AAO combination, Aerobic Pond flow Q at the corresponding levels
O4=anoxic pond flow Q at the corresponding levels
A4 '=water inlet total amount Q
W+ returned sluge total amount Q
S=water inlet total amount Q
W+ first step anaerobic pond head end is joined mud amount Q
S1+ first step anoxic pond head end is joined mud amount Q
S2
A.Q
W＝Q
W1+Q
W2+Q
W3+Q
W4；
B.Q
A′＝Q
A+Q
O-＝Q
O+(Q
A+-Q
w+)；
C.Q
A1＝Q
W1+Q
S1＝Q
A1′-Q
S2；
D.Q
O4＝Q
A4′＝Q
W+Q
S＝Q
W+Q
S1+Q
S2
Above-mentioned formula: Q
W-water inlet total amount;
Q
W1-first step anaerobic pond water distribution quantity;
Q
W2-second stage anaerobic pond water distribution quantity;
Q
W3-third stage anaerobic pond water distribution quantity;
Q
W4-fourth stage anaerobic pond water distribution quantity;
Q
A '-second and third grade anoxic pond flow at the corresponding levels;
Q
A-second and third grade anaerobic pond flow at the corresponding levels;
Q
O--second and third grade previous stage Aerobic Pond flow;
Q
O-second and third grade Aerobic Pond flow at the corresponding levels;
Q
A+-second and third grade next stage anaerobic pond flow;
Q
W+-second and third grade next stage anaerobic pond water distribution quantity;
Q
A1-first step anaerobic pond flow;
Q
A1 '-first step anoxic pond flow;
Q
S1-first step anaerobic pond head end is joined the mud amount;
Q
S2-first step anoxic pond head end is joined the mud amount;
Q
O4-fourth stage Aerobic Pond flow;
Q
A4 '-fourth stage anoxic pond flow;
Q
S-returned sluge total amount.
See Fig. 2 for details; Adopt the ASM2d model in the DHI WEST WWT analogue simulation software that this pond type is carried out computer simulation; Main purpose is that two kinds of technology patterns of multi-stage, efficient denitrogenation and multistage denitrification dephosphorization were to the effect of denitrogenation and dephosphorization after checking changed flow proportional through the branch flow modulation device.
Main analog parameter:
Day output: 50000m
3/ d
Total pond holds: 29167m
3
Total hrt: 14h
The single-stage A/A/O time: 0.5h/0.75h/2.25h
Water temperature: 15 ℃
Oxygen mass transfer coefficient: 150d
-1
In multistage anaerobism anoxic aerobe reaction tank,, can regulate the flow that every grade of anoxic pond water outlet gets into Aerobic Pond at the corresponding levels and subordinate's anaerobic pond through the branch flow modulation device of anoxic pond at different levels water outlet place.Definition K value gets into next stage anaerobic pond and Aerobic Pond at the corresponding levels for anoxic pond throughput ratio.According to the MAAO technology theory; In the MAAO biological reaction tank, exist the denitrogenation of " anaerobic-aerobic-anaerobic-aerobic ... " multi-stage, efficient and two kinds of technology patterns of " anaerobic-anoxic-anaerobic-anoxic ... " multistage denitrification dephosphorization simultaneously; When K≤1, be main with the multi-stage, efficient denitrogenation; Otherwise K＞1 o'clock is main with multistage denitrification dephosphorization.
Simulation test has been chosen the continuous 7 days service data of this MAAO process pool, about 15min of the Inlet and outlet water data logging timed interval, and operation result is following:
Can know that through Fig. 3,4 curves water inlet TN mean concns is 53.6mg/L, when K=0.4; The TN removal effect is better; Water outlet TN MV is 6.2mg/L, and the water outlet TN MV 8.1mg/L when being lower than K=2.3 explains when K gets smaller value (K≤1); Be anoxic pond when carrying out assignment of traffic most of mixed solution got into Aerobic Pond at the corresponding levels, can play the strengthened denitrification effect this moment; Water inlet TP mean concns is 4.5mg/L; When K=2.3, the TP removal effect is better, and water outlet TP MV is 0.2mg/L; Water outlet TP MV 0.3mg/L when being lower than K=0.4; Explain when K gets higher value (K＞1) that most of mixed solution had got into the next stage anaerobic pond when promptly anoxic pond was carried out assignment of traffic, can play the reinforced phosphor-removing effect this moment.
The above only is preferred embodiment of the present invention, is not structure of the present invention is done any pro forma restriction.Every foundation technical spirit of the present invention all still belongs in the scope of technical scheme of the present invention any simple modification, equivalent variations and modification that above embodiment did.
Claims (5)
1. multistage anaerobism anoxic aerobe reaction tank; Comprise that an anaerobic pond, anoxic pond and Aerobic Pond are successively according to anaerobic-anoxic-aerobic series arrangement and the single-stage anaerobism anoxic aerobe reaction tank that is interconnected; It is characterized in that: said single-stage anaerobism anoxic aerobe reaction tank connects and composes M level anaerobism anoxic aerobe reaction tank along water (flow) direction; The said the 1st Aerobic Pond head end to (M-1) level is respectively equipped with the anoxic flow-guiding mouth, and said anoxic flow-guiding mouth is provided with the branch flow modulation device; The tail end of said anoxic pond at the corresponding levels is communicated with Aerobic Pond head end at the corresponding levels through the anoxic flow-guiding mouth, and the tail end of said anoxic pond at the corresponding levels anoxic transition canal through being arranged on Aerobic Pond side at the corresponding levels again is communicated with subordinate anaerobic pond head end; The said the 1st Aerobic Pond tail end to (M-1) level is respectively equipped with aerobic transition canal; The 1st anaerobic pond tail end to (M-1) level is respectively equipped with the anaerobic diversion mouth; Said Aerobic Pond tail end at the corresponding levels links to each other with subordinate anoxic pond head end through aerobic transition canal, and the said the 1st anaerobic pond tail end to (M-1) level links to each other with this grade anoxic pond head end through the anaerobic diversion mouth.
2. multistage anaerobism anoxic aerobe reaction tank according to claim 1 is characterized in that: progression M >=2 of said M level anaerobism anoxic aerobe reaction tank.
3. multistage anaerobism anoxic aerobe reaction tank according to claim 1; It is characterized in that: the Aerobic Pond head end in the said M level anaerobism anoxic aerobe reaction tank is provided with the anoxic flow-guiding mouth; The anoxic pond of the said corresponding levels is communicated with Aerobic Pond through the anoxic flow-guiding mouth, and said Aerobic Pond tail end is communicated with water outlet through effluent weir.
4. multistage anaerobism anoxic aerobe reaction tank according to claim 1; It is characterized in that: a side pool wall of said multistage anaerobism anoxic aerobe reaction tank is provided with inlet channel; Inlet channel is provided with water-distributing gap, and the opposite side and the upside of multistage anaerobism anoxic aerobe reaction tank are provided with the returned sluge canal, and the returned sluge canal is provided with joins the mud mouth; Said water-distributing gap quantity is identical with the combination progression M of single-stage anaerobism anoxic aerobe reaction tank, and corresponding with anaerobic pond head ends at different levels; Joining mud mouth quantity is two, and the head end with the anaerobic pond of first step anaerobism anoxic aerobe reaction tank and anoxic pond is corresponding respectively.
5. multistage anaerobism anoxic aerobe reaction tank according to claim 1; It is characterized in that: the pond length of said multistage anaerobism anoxic aerobe reaction tank equals M level anaerobism anoxic aerobe reaction tank width sum, the equal in length of pond anaerobic ponds wide and at different levels, anoxic pond, Aerobic Pond.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103145246A (en) * | 2013-03-29 | 2013-06-12 | 环境保护部南京环境科学研究所 | Device and method for controlling runoff pollution of farmland for large-scale farming |
| CN106495322A (en) * | 2016-11-07 | 2017-03-15 | 天津市市政工程设计研究院 | A kind of A of multistage multi-mode operation2/ O biological reaction pools |
| CN106650264A (en) * | 2016-12-26 | 2017-05-10 | 天津城建大学 | Dimension designing method for oxidation ditch biological reaction tank intensifying denitrification nitrogen and phosphorus removal |
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| JPS5678691A (en) * | 1979-11-30 | 1981-06-27 | Sumitomo Jukikai Envirotec Kk | Processing method for organic waste water |
| CN101993171A (en) * | 2009-08-19 | 2011-03-30 | 中国市政工程西北设计研究院有限公司 | Multi-segment multi-stage AO phosphorus and nitrogen removal process and reaction system thereof |
| CN202492439U (en) * | 2012-03-19 | 2012-10-17 | 中国市政工程西北设计研究院有限公司天津分院 | Multistage anaerobic-anoxia-aerobic bioreaction tank |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5678691A (en) * | 1979-11-30 | 1981-06-27 | Sumitomo Jukikai Envirotec Kk | Processing method for organic waste water |
| CN101993171A (en) * | 2009-08-19 | 2011-03-30 | 中国市政工程西北设计研究院有限公司 | Multi-segment multi-stage AO phosphorus and nitrogen removal process and reaction system thereof |
| CN202492439U (en) * | 2012-03-19 | 2012-10-17 | 中国市政工程西北设计研究院有限公司天津分院 | Multistage anaerobic-anoxia-aerobic bioreaction tank |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103145246A (en) * | 2013-03-29 | 2013-06-12 | 环境保护部南京环境科学研究所 | Device and method for controlling runoff pollution of farmland for large-scale farming |
| CN106495322A (en) * | 2016-11-07 | 2017-03-15 | 天津市市政工程设计研究院 | A kind of A of multistage multi-mode operation2/ O biological reaction pools |
| CN106650264A (en) * | 2016-12-26 | 2017-05-10 | 天津城建大学 | Dimension designing method for oxidation ditch biological reaction tank intensifying denitrification nitrogen and phosphorus removal |
| CN106650264B (en) * | 2016-12-26 | 2020-04-28 | 天津城建大学 | Size design method for oxidation ditch biological reaction tank for enhancing denitrification nitrogen and phosphorus removal |
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