CN105084670A - AAO (anaerobic-anoxic-oxic) sewage treatment system and technique of standard surface water Class IV - Google Patents
AAO (anaerobic-anoxic-oxic) sewage treatment system and technique of standard surface water Class IV Download PDFInfo
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Abstract
The invention discloses an AAO (anaerobic-anoxic-oxic) sewage treatment system and technique of standard surface water Class IV. The system comprises an AAO biochemical tank, a peripheral-feed peripheral-overflow rectangular secondary sedimentation tank and a biological contact oxidation tank. After sewage enters the AAO biochemical tank, the alternate circulation of the three (anaerobic, anoxic and oxic) different parts is utilized to implement biological dephosphorization and denitrification treatment on the sewage discharged by the sewage pipe; the first anoxic tank and anaerobic part form an independent internal reflux, the oxic part and second anoxic tank form another independent internal reflux, and the insides of the anaerobic part, first anoxic tank, second anoxic tank and oxic part are respectively designed into a cyclic reflux type; the sewage from a water outlet end of the oxic part enters the peripheral-feed peripheral-overflow secondary sedimentation tank to implement solid-liquid separation; part of the separated sludge flows back to the first anoxic tank or anaerobic tank of the AAO biochemical tank, and the rest sludge is discharged as surplus sludge; and the sewage separated from the peripheral-feed peripheral-overflow rectangular secondary sedimentation tank is introduced into the biological contact oxidation tank and subjected to reinforced ammonia nitrogen oxidative decomposition by a biofilm process, thereby purifying the sewage.
Description
Technical field
The present invention relates to sewage treatment area technology, refer in particular to a kind of AAO Sewage treatment systems and technique thereof of surface water up to standard four class.
Background technology
According to surface water water environment function and containment objective, the surface water of China is divided into five classes by function height: I, II, III, IV, V; A lot of urban sewage discharge standard fixes on the emission standard of surface water IV class now, is namely mainly applicable to the recreational water district of general industry Water District and human body non-direct contact.
Municipal effluent is city domestic sewage and part trade effluent mainly, at present, mainly adopt the method for physics, biology and chemistry to process with the solid pollutant in Separation of Water trade effluent and sanitary sewage and the organic pollutant reduced in water and nutrient rich (being mainly nitrogen, phosphorus compound), thus alleviate the pollution of sewage to environment.Conventional activated sludge method can meet the clearance of CODcr, BOD5, SS, but there is certain limit to the clearance of nitrogen, phosphorus, only from conventional activated sludge method excess sludge, get rid of nitrogen, phosphorus, it removes total nitrogen about 15 ~ 25%, but due to the ammonification of total nitrogen in sewage, ammonia nitrogen removal efficiency is very low, often can not remove ammonia nitrogen.Total phosphorus generally removes about 30 ~ 50%, does not reach the emission standard of surface water IV class to the requirement of water quality.Some Sewage treatment systems, although the emission standard effluent quality of aforementioned surface water IV class can be realized, but, it is comparatively large to there is variation water quality amplitude in it, and the defect that technology stability is not good enough, particularly to the height of TP, ammonia nitrogen requirement, and, its to carry out in sewage treatment process to consume the energy more, cost of sewage disposal is high, is unfavorable for applying.
Therefore, need to work out a kind of new technical scheme and solve the problems referred to above.
Summary of the invention
In view of this, the present invention is directed to the disappearance of prior art existence, its main purpose is to provide a kind of AAO Sewage treatment systems and technique thereof of surface water up to standard four class, it can significantly cut down the Pollutant levels such as CODcr, BOD5, SS and TN, NH3-N, TP, and its technology stability is good, has effluent quality and ensure well.
For achieving the above object, the present invention adopts following technical scheme:
A kind of AAO Sewage treatment systems of surface water four class up to standard, includes the AAO biochemistry pool, the Zhou Jinzhou that connect successively along technological process and goes out rectangle second pond and biological contact oxidation pond;
This AAO biochemistry pool includes anaerobic pond, the first anoxic pond, the second anoxic pond and Aerobic Pond; This AAO biochemistry pool is connected with air suspension centrifugal blower; Pore type aerator is provided with in this Aerobic Pond; The waste pipe of aforementioned aerated grit chamber is connected to the feed-water end of anaerobic pond, and the water side of anaerobic pond is communicated with the feed-water end of the first anoxic pond, and the water side of the first anoxic pond is communicated with the feed-water end of the second anoxic pond, and the water side of the second anoxic pond is communicated with the feed-water end of Aerobic Pond; The water side of Aerobic Pond is back to the feed-water end of the second anoxic pond, is provided with internal reflux pump between Aerobic Pond and the second anoxic pond, is provided with submersible water impeller in the second anoxic pond, forms the second anoxic pond internal reflux and the backflow between the second anoxic pond and Aerobic Pond; Be provided with internal reflux pump between first anoxic pond and anaerobic pond, in the first anoxic pond and anaerobic pond, be also respectively arranged with submersible water impeller, form internal reflux and the backflow between the two separately of the first anoxic pond, anaerobic pond.
As a kind of preferred version, described anaerobic pond, the first anoxic pond, the second anoxic pond are all rectangle structure, all vertical next door is had along long side direction is extended in its respective cells, this vertical next door will be separated to form left and right side runner in respective cells, and vertical two ends, next door and respective cells inwall keep spacing, aforementioned left and right side runner forms annular return road through go-and-retum apart from being communicated with, and aforementioned submersible water impeller is arranged in the runner of right side respectively.
As a kind of preferred version, before and after described anaerobic pond, the first anoxic pond, neighbour establishes and has a common wall, the common wall of this anaerobic pond, the first anoxic pond offers first and second through hole of left and right pitch arrangement, this first and second through hole is the through setting in front and back all, and this first and second through hole is just offered aforementioned left and right side runner respectively; The annular return road of aforementioned anaerobic pond, the first anoxic pond is the annular return road of counterclockwise backflow, and the submersible water impeller on the left of it in runner backward pulling flow type is arranged, and the submersible water impeller in the runner of right side forward pulling flow type is arranged;
The annular return road of this second anoxic pond is the annular return road of clockwise direction backflow, and the submersible water impeller on the left of it in runner forward pulling flow type is arranged, and the submersible water impeller in the runner of right side backward pulling flow type is arranged; This second anoxic pond is positioned at the left side of anaerobic pond, the first anoxic pond, and the second anoxic pond and anaerobic pond, the first anoxic pond have a common wall respectively; The common wall of the second anoxic pond and the first anoxic pond offers the fourth hole that left and right is through, this fourth hole is just to the spacing of rear end, next door vertical in the first anoxic pond;
This Aerobic Pond includes horizontal pond, front end through successively, the horizontal pond in middle longitudinal pond and rear end, and this Aerobic Pond is positioned on the left of the second anoxic pond; The horizontal pond in the front end of the second anoxic pond and front end has a common wall, fourth hole through before and after this common wall offers, and this fourth hole is just arranged the right side runner of the second anoxic pond; The horizontal pond in the rear end of this second anoxic pond and rear end has a common wall, fifth hole through before and after this common wall offers, and this fifth hole is just arranged the left side runner of the second anoxic pond; The longitudinal pond in the left side of this second anoxic pond and centre has a common wall;
And aforementioned internal reflux pump is arranged at aforementioned second through hole, fifth hole place respectively.
As a kind of preferred version, the width of described spacing is equal respectively with the width of left and right side runner.
As a kind of preferred version, the inside four corners position of described anaerobic pond, the first anoxic pond, the second anoxic pond is all designed to lead round transition structure.
As a kind of preferred version, in described AAO biochemistry pool, be provided with aforementioned two groups of anaerobic ponds, the first anoxic pond, the second anoxic pond and Aerobic Pond, and the left and right symmetrical expression of its two groups of structures is arranged; The outside rectangular structure of whole AAO biochemistry pool.
As a kind of preferred version, the feed-water end that described Zhou Jinzhou goes out rectangle second pond is connected to the water side of aforementioned Aerobic Pond, Zhou Jinzhou goes out rectangle second pond and is provided with hydrocone type bridge mud scraper, tubular type skimmer, scum silica frost frame and shore pipe, and this shore pipe diversion design is the first sludge reflux end and the first excess sludge outlet end; Its first sludge reflux end connects the first anoxic pond or the anaerobic pond that are back to aforementioned AAO biochemistry pool through the first sludge reflux pump; The feed-water end of described biological contact oxidation pond is connected to the water side that aforementioned Zhou Jinzhou goes out rectangle second pond, and this biological contact oxidation pond is provided with filler, microporous diaphragm aeration head and Root's blower; And the feed-water end of this biological contact oxidation pond is provided with into water distributing hole.
As a kind of preferred version, be also provided with deodoration system, aforementioned AAO biochemistry pool, Zhou Jinzhou go out rectangle second pond and are connected to deodoration system respectively; This deodoration system includes glass reinforced plastic centrifugal blower, feeding spraying pump, water circulating pump.
A kind of AAO sewage treatment process of surface water four class up to standard, includes following processing step:
(1) sewage enters AAO biochemistry pool, utilizes the biological dephosphorize denitrification process of alternate cycles realization to waste pipe institute sewer of anaerobism, anoxic, aerobic three different pieces; Anoxic part is divided into two by it, form the first anoxic pond and the second anoxic pond, first anoxic pond and anaerobic part form independently internal reflux, aerobic part and the second anoxic pond form another independently internal reflux, and, anaerobic part, the first anoxic pond, the second anoxic pond and aerobic part separately indoor design are around return-flow type, and, methyl alcohol extra-nutrition thing is added to improve efficiencies of nitrogen removal by control on demand to aforementioned aerobic part;
(2) the water side sewage of aerobic part enters Zhou Jinzhou and goes out in rectangle second pond to realize solid-liquid separation; A separating obtained mud part is back to the first anoxic pond or the anaerobic pond of aforementioned AAO biochemistry pool, and another part is then discharged as excess sludge;
(3) go out the separating obtained sewage of rectangle second pond through Zhou Jinzhou to introduce in biological contact oxidation pond, utilize biomembrance process to strengthen ammonium oxidation and decompose, sewage is purified.
The present invention compared with prior art has obvious advantage and beneficial effect, specifically, as shown from the above technical solution, the adjustable water inlet ratio being dispensed to anaerobism section and anoxic section of its EMUCT, so as while biological carbon and phosphorous removal optimum carbon source is provided; One or two anoxic unit can be converted to aerobic unit, even if also can obtain gratifying effect in the winter time according to water inlet carbon-nitrogen ratio by EMUCT; Sludge reflux adopts secondary backflow, returned sluge has just consumed dissolved oxygen and nitric nitrogen in first anoxic unit, this makes to be back to nitre state oxygen in the mud of anaerobism section is zero, ensure that anaerobic pond anaerobic state, thus can reduce anaerobic pond volume, improve biological phosphor-removing effect; Also can directly EMUCT be run by A/A/O mode activity sludge reflux to anaerobism section according to actual water quality situation, now can save first step backflow, save energy consumption; Do not need to control in real time according to water inlet TKN/COD nitrate amount; By this, by the design of AAO biochemistry pool, two settling tanks and biological contact oxidation pond and cooperatively interact, realize significantly cutting down the Pollutant levels such as CODcr, BOD5, SS and TN, NH3-N, TP, have effluent quality and ensure well, and its dosage is less, generation mud is few, and treating processes energy consumption is lower, and the best achieving environmental benefit and economic benefit is well unified.
For more clearly setting forth constitutional features of the present invention and effect, below in conjunction with accompanying drawing and specific embodiment, the present invention is described in detail.
Accompanying drawing explanation
Fig. 1 is the configuration diagram of the embodiment of the present invention;
Fig. 2 is the configuration diagram of AAO biochemistry pool in the embodiment of the present invention;
Fig. 3 is the configuration diagram of second pond, biological contact oxidation pond in the embodiment of the present invention.
Accompanying drawing identifier declaration:
30, AAO biochemistry pool
31, anaerobic pond 32, first anoxic pond
33, the second anoxic pond 34, Aerobic Pond
35, internal reflux pump 36, submersible water impeller
37, aeration tube 38, air blast machine room
40, Zhou Jinzhou goes out rectangle second pond 41, tubular type skimmer
42, scum silica frost frame 43, shore pipe
50, biological contact oxidation pond 51, filler
52, microporous diaphragm aeration head 53, water inlet distributing hole.
Embodiment
Please refer to shown in Fig. 1 to Fig. 3, that show the concrete structure of the embodiment of the present invention, herein, the AO-KEDA process system studied intensively for applicant explains; It includes the AAO biochemistry pool 30, the Zhou Jinzhou that connect successively along technological process and goes out rectangle second pond 40 and biological contact oxidation pond 50.
This AAO biochemistry pool 30 includes anaerobic pond 31, first anoxic pond 32, second anoxic pond 33 and Aerobic Pond 34; This AAO biochemistry pool 30 is connected with air suspension centrifugal blower (can arrange air blast machine room 38 specially); Pore type aerator is provided with in this Aerobic Pond 34; Need dispose of sewage and enter the feed-water end of anaerobic pond 31, the water side of anaerobic pond 31 is communicated with the feed-water end of the first anoxic pond 32, and the water side of the first anoxic pond 32 is communicated with the feed-water end of the second anoxic pond 33, and the water side of the second anoxic pond 33 is communicated with the feed-water end of Aerobic Pond 34; The water side of Aerobic Pond 34 is back to the feed-water end of the second anoxic pond 33, internal reflux pump 35 is provided with between Aerobic Pond 34 and the second anoxic pond 33, be provided with submersible water impeller 36 in second anoxic pond 33, form the second anoxic pond 33 internal reflux and the backflow between the second anoxic pond 33 and Aerobic Pond 34; Be provided with between first anoxic pond 32 and anaerobic pond 31 in internal reflux pump 35, first anoxic pond 32 and anaerobic pond 31 and be also respectively arranged with submersible water impeller 36, form internal reflux and the backflow between the two separately of the first anoxic pond 32, anaerobic pond 31.
In the present embodiment, aforementioned two groups of anaerobic ponds 31, first anoxic pond 32, second anoxic pond 33 and Aerobic Pond 34 is provided with in described AAO biochemistry pool 30, and the left and right symmetrical expression of its two groups of structures is arranged, middlely to enter for sewage, the outside rectangular structure of whole AAO biochemistry pool 30, described anaerobic pond 31, first anoxic pond 32, second anoxic pond 33 is all rectangle structure, its inner four corners position is all designed to lead round transition structure, so that backflow guiding is smooth and easy, reduce deposition dead angle, all vertical next door is had along long side direction is extended in its respective cells, this vertical next door is separated to form a left side by respective cells, right side runner, and vertical two ends, next door and respective cells inwall keep spacing (as preferred design, the width of described spacing is with left, the width of right side runner is equal respectively), an aforementioned left side, right side runner forms annular return road through go-and-retum apart from being communicated with, aforementioned submersible water impeller is arranged in the runner of right side respectively.
Before and after aforementioned anaerobic pond, the first anoxic pond, neighbour establishes and has a common wall, the common wall of this anaerobic pond, the first anoxic pond offers first and second through hole of left and right pitch arrangement, this first and second through hole is the through setting in front and back all, and this first and second through hole is just offered aforementioned left and right side runner respectively; The annular return road of aforementioned anaerobic pond, the first anoxic pond is the annular return road of counterclockwise backflow, and the submersible water impeller on the left of it in runner backward pulling flow type is arranged, and the submersible water impeller in the runner of right side forward pulling flow type is arranged.
The annular return road of this second anoxic pond is the annular return road of clockwise direction backflow, and the submersible water impeller on the left of it in runner forward pulling flow type is arranged, and the submersible water impeller in the runner of right side backward pulling flow type is arranged; This second anoxic pond is positioned at the left side of anaerobic pond, the first anoxic pond, and the second anoxic pond and anaerobic pond, the first anoxic pond have a common wall respectively; The common wall of the second anoxic pond and the first anoxic pond offers the fourth hole that left and right is through, this fourth hole is just to the spacing of rear end, next door vertical in the first anoxic pond.
This Aerobic Pond includes horizontal pond, front end through successively, the horizontal pond in middle longitudinal pond and rear end, every being provided with some left and right to extending and the water conservancy diversion next door of space type setting each other in its middle longitudinal pond, the alternative expression left and right inner side-wall extension from middle longitudinal pond respectively of described water conservancy diversion next door, water conservancy diversion next door is less than the left and right in middle longitudinal pond to width along left and right to width, and adjacent two water conservancy diversion next doors have superimposed position, so, the flow direction in Aerobic Pond is made to be multistage S shape winding type, roughly as shown in the direction of arrow in Fig. 2; This Aerobic Pond is positioned on the left of the second anoxic pond; The horizontal pond in the front end of the second anoxic pond and front end has a common wall, fourth hole through before and after this common wall offers, and this fourth hole is just arranged the right side runner of the second anoxic pond; The horizontal pond in the rear end of this second anoxic pond and rear end has a common wall, fifth hole through before and after this common wall offers, and this fifth hole is just arranged the left side runner of the second anoxic pond; The longitudinal pond in the left side of this second anoxic pond and centre has a common wall; And aforementioned internal reflux pump is arranged at aforementioned second through hole, fifth hole place respectively.
The design of this AAO biochemistry pool, has many advantages, such as: the 1. adjustable water inlet ratio being dispensed to anaerobism section and anoxic section of EMUCT so that for while biological carbon and phosphorous removal optimum carbon source is provided; 2. one or two anoxic unit can be converted to aerobic unit, even if also can obtain gratifying effect in the winter time according to water inlet carbon-nitrogen ratio by EMUCT; 3. sludge reflux adopts secondary backflow, returned sluge has just consumed dissolved oxygen and nitric nitrogen in first anoxic unit, this makes to be back to nitre state oxygen in the mud of anaerobism section is zero, ensure that anaerobic pond anaerobic state, thus can reduce anaerobic pond volume, improve biological phosphor-removing effect; 4. also can directly EMUCT be run by A/A/O mode activity sludge reflux to anaerobism section according to actual water quality situation, now can save first step backflow, save energy consumption; 5. do not need to control in real time according to water inlet TKN/COD nitrate amount; 6. can add methyl alcohol extra-nutrition thing by control on demand, improve efficiencies of nitrogen removal.By the process of AAO biochemistry pool, can significantly cut down the Pollutant levels such as CODcr, BOD5, SS and TN, NH3-N, TP.
The feed-water end that this Zhou Jinzhou goes out rectangle second pond 40 is connected to the water side of aforementioned Aerobic Pond 34, Zhou Jinzhou goes out rectangle second pond 40 and is provided with hydrocone type bridge mud scraper, tubular type skimmer 41, scum silica frost frame 42 and shore pipe 43, and this shore pipe 43 diversion design is the first sludge reflux end and the first excess sludge outlet end; Its first sludge reflux end connects the first anoxic pond being back to aforementioned AAO biochemistry pool through the first sludge reflux pump.This Zhou Jinzhou goes out rectangle second pond 40 based on shallow pool theory design, water inlet even water distribution, and the adaptive faculty of impact load and temperature variation is stronger, sedimentation effect is stablized, head loss less (generally at about 0.6 ~ 0.8m), and sludge lifting expense is low, easy construction, floor space is few.
The feed-water end of this biological contact oxidation pond 50 is connected to the water side that aforementioned Zhou Jinzhou goes out rectangle second pond 40, utilizes biomembrance process to strengthen ammonium oxidation and decomposes, sewage is purified; This biological contact oxidation pond 50 is provided with filler 51, microporous diaphragm aeration head 52 and Root's blower; And the feed-water end of this biological contact oxidation pond 50 is provided with into water distributing hole 53; By this, go out by AAO biochemistry pool 30, Zhou Jinzhou the combination process that rectangle second pond 40 and biological contact oxidation pond 50 complete, give full play to the dephosphorization denitrogenation function of microorganism, based on biological phosphate-eliminating, reduce added amount of chemical, reduce running cost.
Utilize aforementioned AAO Sewage treatment systems to carry out the method for biochemical treatment, include following processing step:
(1) sewage enters AAO biochemistry pool 30, utilizes the biological dephosphorize denitrification process of alternate cycles realization to waste pipe institute sewer of anaerobism, anoxic, aerobic three different pieces; Anoxic part is divided into two by it, form the first anoxic pond and the second anoxic pond, first anoxic pond and anaerobic part form independently internal reflux, aerobic part and the second anoxic pond form another independently internal reflux, further, anaerobic part, the first anoxic pond, the second anoxic pond and aerobic part separately indoor design be around return-flow type;
(2) the water side sewage of aerobic part enters Zhou Jinzhou and goes out in rectangle second pond 40 to realize solid-liquid separation; A separating obtained mud part is back to the first anoxic pond 32 or anaerobic pond of aforementioned AAO biochemistry pool 30, and another part is then discharged as excess sludge;
(3) going out the separating obtained sewage of rectangle second pond 40 through Zhou Jinzhou introduces in biological contact oxidation pond 50, and it is utilize biomembrance process to strengthen ammonium oxidation to decompose, and sewage is purified.
The above, it is only preferred embodiment of the present invention, not technical scope of the present invention is imposed any restrictions, thus every above embodiment is done according to technical spirit of the present invention any trickle amendment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (9)
1. an AAO Sewage treatment systems for surface water four class up to standard, is characterized in that: include the AAO biochemistry pool, the Zhou Jinzhou that connect successively along technological process and go out rectangle second pond and biological contact oxidation pond;
This AAO biochemistry pool includes anaerobic pond, the first anoxic pond, the second anoxic pond and Aerobic Pond; This AAO biochemistry pool is connected with air suspension centrifugal blower; Pore type aerator is provided with in this Aerobic Pond; The waste pipe of aforementioned aerated grit chamber is connected to the feed-water end of anaerobic pond, and the water side of anaerobic pond is communicated with the feed-water end of the first anoxic pond, and the water side of the first anoxic pond is communicated with the feed-water end of the second anoxic pond, and the water side of the second anoxic pond is communicated with the feed-water end of Aerobic Pond; The water side of Aerobic Pond is back to the feed-water end of the second anoxic pond, is provided with internal reflux pump between Aerobic Pond and the second anoxic pond, is provided with submersible water impeller in the second anoxic pond, forms the second anoxic pond internal reflux and the backflow between the second anoxic pond and Aerobic Pond; Be provided with internal reflux pump between first anoxic pond and anaerobic pond, in the first anoxic pond and anaerobic pond, be also respectively arranged with submersible water impeller, form internal reflux and the backflow between the two separately of the first anoxic pond, anaerobic pond.
2. the AAO Sewage treatment systems of surface water up to standard four class according to claim 1, it is characterized in that: described anaerobic pond, the first anoxic pond, the second anoxic pond are all rectangle structure, all vertical next door is had along long side direction is extended in its respective cells, this vertical next door will be separated to form left and right side runner in respective cells, and vertical two ends, next door and respective cells inwall keep spacing, aforementioned left and right side runner forms annular return road through go-and-retum apart from being communicated with, and aforementioned submersible water impeller is arranged in the runner of right side respectively.
3. the AAO Sewage treatment systems of surface water up to standard four class according to claim 2, it is characterized in that: before and after described anaerobic pond, the first anoxic pond, neighbour establishes and has a common wall, the common wall of this anaerobic pond, the first anoxic pond offers first and second through hole of left and right pitch arrangement, this first and second through hole is the through setting in front and back all, and this first and second through hole is just offered aforementioned left and right side runner respectively; The annular return road of aforementioned anaerobic pond, the first anoxic pond is the annular return road of counterclockwise backflow, and the submersible water impeller on the left of it in runner backward pulling flow type is arranged, and the submersible water impeller in the runner of right side forward pulling flow type is arranged;
The annular return road of this second anoxic pond is the annular return road of clockwise direction backflow, and the submersible water impeller on the left of it in runner forward pulling flow type is arranged, and the submersible water impeller in the runner of right side backward pulling flow type is arranged; This second anoxic pond is positioned at the left side of anaerobic pond, the first anoxic pond, and the second anoxic pond and anaerobic pond, the first anoxic pond have a common wall respectively; The common wall of the second anoxic pond and the first anoxic pond offers the fourth hole that left and right is through, this fourth hole is just to the spacing of rear end, next door vertical in the first anoxic pond;
This Aerobic Pond includes horizontal pond, front end through successively, the horizontal pond in middle longitudinal pond and rear end, and this Aerobic Pond is positioned on the left of the second anoxic pond; The horizontal pond in the front end of the second anoxic pond and front end has a common wall, fourth hole through before and after this common wall offers, and this fourth hole is just arranged the right side runner of the second anoxic pond; The horizontal pond in the rear end of this second anoxic pond and rear end has a common wall, fifth hole through before and after this common wall offers, and this fifth hole is just arranged the left side runner of the second anoxic pond; The longitudinal pond in the left side of this second anoxic pond and centre has a common wall;
And aforementioned internal reflux pump is arranged at aforementioned second through hole, fifth hole place respectively.
4. the AAO Sewage treatment systems of surface water up to standard four class according to claim 3, is characterized in that: the width of described spacing is equal respectively with the width of left and right side runner.
5. the AAO Sewage treatment systems of surface water up to standard four class according to claim 4, is characterized in that: the inside four corners position of described anaerobic pond, the first anoxic pond, the second anoxic pond is all designed to lead round transition structure.
6. the AAO Sewage treatment systems of surface water up to standard four class according to claim 3, it is characterized in that: in described AAO biochemistry pool, be provided with aforementioned two groups of anaerobic ponds, the first anoxic pond, the second anoxic pond and Aerobic Pond, and the left and right symmetrical expression of its two groups of structures is arranged; The outside rectangular structure of whole AAO biochemistry pool.
7. the AAO Sewage treatment systems of surface water up to standard four class according to claim 1, it is characterized in that: the feed-water end that described Zhou Jinzhou goes out rectangle second pond is connected to the water side of aforementioned Aerobic Pond, Zhou Jinzhou goes out rectangle second pond and is provided with hydrocone type bridge mud scraper, tubular type skimmer, scum silica frost frame and shore pipe, and this shore pipe diversion design is the first sludge reflux end and the first excess sludge outlet end; Its first sludge reflux end connects the first anoxic pond or the anaerobic pond that are back to aforementioned AAO biochemistry pool through the first sludge reflux pump; The feed-water end of described biological contact oxidation pond is connected to the water side that aforementioned Zhou Jinzhou goes out rectangle second pond, and this biological contact oxidation pond is provided with filler, microporous diaphragm aeration head and Root's blower; And the feed-water end of this biological contact oxidation pond is provided with into water distributing hole.
8. the AAO Sewage treatment systems of surface water up to standard four class according to claim 1, is characterized in that: be also provided with deodoration system, and aforementioned AAO biochemistry pool, Zhou Jinzhou go out rectangle second pond and be connected to deodoration system respectively; This deodoration system includes glass reinforced plastic centrifugal blower, feeding spraying pump, water circulating pump.
9. an AAO sewage treatment process for surface water four class up to standard, is characterized in that: include following processing step
(1) sewage enters AAO biochemistry pool, utilizes the biological dephosphorize denitrification process of alternate cycles realization to waste pipe institute sewer of anaerobism, anoxic, aerobic three different pieces; Anoxic part is divided into two by it, form the first anoxic pond and the second anoxic pond, first anoxic pond and anaerobic part form independently internal reflux, aerobic part and the second anoxic pond form another independently internal reflux, and, anaerobic part, the first anoxic pond, the second anoxic pond and aerobic part separately indoor design are around return-flow type, and, methyl alcohol extra-nutrition thing is added to improve efficiencies of nitrogen removal by control on demand to aforementioned aerobic part;
(2) the water side sewage of aerobic part enters Zhou Jinzhou and goes out in rectangle second pond to realize solid-liquid separation; A separating obtained mud part is back to the first anoxic pond or the anaerobic pond of aforementioned AAO biochemistry pool, and another part is then discharged as excess sludge;
(3) go out the separating obtained sewage of rectangle second pond through Zhou Jinzhou to introduce in biological contact oxidation pond, utilize biomembrance process to strengthen ammonium oxidation and decompose, sewage is purified.
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| CN112320946A (en) * | 2020-09-28 | 2021-02-05 | 河南科技大学 | Method for controlling backflow and dissolved oxygen of mixed liquid of AAO system |
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| CN105084670B (en) | 2018-01-30 |
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