CN105417691A - Construction method for denitrifyjng simultaneous phosphorus and nitrogen removal advanced treatment system of anoxic biological filter - Google Patents
Construction method for denitrifyjng simultaneous phosphorus and nitrogen removal advanced treatment system of anoxic biological filter Download PDFInfo
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- CN105417691A CN105417691A CN201410477710.3A CN201410477710A CN105417691A CN 105417691 A CN105417691 A CN 105417691A CN 201410477710 A CN201410477710 A CN 201410477710A CN 105417691 A CN105417691 A CN 105417691A
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Abstract
The invention relates to a construction method for a denitrifyjng simultaneous phosphorus and nitrogen removal advanced treatment system of an anoxic biological filter. A reactor is the anoxic biological filter provided with quartz packing, wherein an oxygenating facility is not arranged in the anoxic biological filter and the C/N ratio of a water inflow is controlled at 5-6 by inputting a carbon source into the water inflow, so that the reactor has a good denitrifyjng advanced nitrogen removal capacity; meanwhile, by additionally arranging an anaerobic phosphorus releasing section before back flushing of the anoxic biological filter, the anoxic biological filter operates in an anaerobic/anoxic alternating environment so as to create a good growing environment for denitrifying phosphate-accumulating organisms and effectively enriching the denitrifying phosphate-accumulating organisms. The anoxic biological filter has the capacity of simultaneously removing phosphorus during denitrifyjng nitrogen removal. The construction method provided by the invention solves the problem that a conventional anoxic biological filter cannot remove phosphorus simultaneously during denitrifyjng nitrogen removal, has the advantages of being high in efficiency for simultaneously removing phosphorus and nitrogen in an advanced manner, short in process flow and low in investment and operation costs, and opens a novel path for advanced phosphorus and nitrogen removal of tail water of a sewage plant.
Description
Technical field
The invention belongs to saprobia deep treatment method, particularly a kind of construction process of hypoxic-ischemic brain-damage denitrification simultaneous phosphorus and nitrogen removal advanced treatment system.
Background technology
Nitrogen, phosphorus are all the principal elements causing body eutrophication, and the tail water of Sewage Plant discharge carries after the nutritive substances such as a large amount of nitrogen, phosphorus enter water body, may cause body eutrophication, thus whole aquatic ecosystem water function of unifying is damaged.
To it is generally acknowledged in water body that total nitrogen concentration is greater than 0.2mg/L or total phosphorus concentration when reaching 0.02mg/L, algae can amount reproduction, thus causes water body to form eutrophication.But, in the tail water of urban wastewater treatment firm, the content of nitrogen and phosphorous is all far above the content of nitrogen and phosphorous in natural river, one-level B in the urban wastewater treatment firm pollutant emission standard (GB18918-2002) that current town sewage plant generally performs marks (total nitrogen≤20mg/L, total phosphorus≤1.0mg/L), its the content of nitrogen and phosphorous is all higher than V class Water Environment Standards (total nitrogen≤2mg/L, total phosphorus≤0.4mg/L), this proposes new requirement to Sewage Plant deep phosphorous removal denitride technology.
In recent years, denitrification filter pool is successfully applied in Sewage Plant advanced nitrogen treating processes, but existing denitrification filter pool mainly concentrates on denitrification functions, do not possess phosphorus removal functional, phosphorus in Sewage Plant secondary effluent still by arranging flocculation sediment technique unit before filter tank, by adding aluminium salt or molysite chemical agent is removed, sewerage advanced treatment process long flow path, investment and processing cost high.Relevant research shows, a part of Denitrifying Phosphate Accumulating Organisms PAOs under anoxic conditions, can not only be that electron acceptor(EA) carries out denitrification with nitrate, can also realize the excessive consumption of phosphorus simultaneously.This PAOs can carry out enrichment by the environment of anaerobic/anoxic alternate run, and this needs multi-stage process unit to realize usually.Therefore, intend utilizing Denitrifying Phosphate Accumulating Organisms, in denitrification filter pool, realize simultaneous phosphorus and nitrogen removal function, open up new technological approaches by for the efficient advanced treatment of Sewage Plant tail water.
Summary of the invention
The object of this invention is to provide a kind of construction process of hypoxic-ischemic brain-damage denitrification simultaneous phosphorus and nitrogen removal advanced treatment system, quasi-solution determine conventional denitrification filter tank can only denitrogenation can not phosphorus removal functional single, deep phosphorous removal denitrification process long flow path, the problems such as investment working cost is high.
For achieving the above object, the present invention adopts Continuous Flow hypoxic-ischemic brain-damage, inside establish quartz sand filler, keep water level constant on constant flow velocity and filter tank, anaerobic phosphorus release working hour is set before filter back washing, form the environment of anaerobic-anoxic alternate run in the reactor, effective gathering denitrifying polyP bacteria, be that electron acceptor(EA) carries out denitrification by Denitrifying Phosphate Accumulating Organisms with nitrate, the excessive consumption of phosphorus can also be realized simultaneously, construct denitrification synchronous denitrification dephosphorizing system.Concrete technical scheme is as follows:
A construction process for hypoxic-ischemic brain-damage denitrification simultaneous phosphorus and nitrogen removal advanced treatment system, the method is that the tail water reaching town sewage plant pollutant emission one-level B standard for municipal wastewater treatment plant carries out advanced treatment, and it is as follows that it comprises step:
(1) adopt Continuous Flow hypoxic-ischemic brain-damage as reactor, inside establish quartz sand filler, bottom water inlet top water outlet, does not establish oxygenation facility;
(2) by being back to back in reactor containing nitric nitrogen and the sewage (C/N ratio is 5 ~ 6) having added carbon source, in filtration procedure, simultaneous phosphorus and nitrogen removal is carried out by the Denitrifying Phosphate Accumulating Organisms of natural enrichment in reactor quartz sand filter media layer; Water inlet;
(3) after reactor runs for some time, stop water inlet, before back flushing, set up anaerobic phosphorus release section, form the environment of anaerobic-anoxic alternate run in the reactor, gathering denitrifying polyP bacteria, and the carbon source adding abundance in the reactor makes polyP bacteria fully release phosphorus;
(4) after the anaerobic phosphorus release period terminates, reactor enters the back flushing stage, and reactor participates in air water associating backwashing manner, and rich phosphorus sewage, with back flushing water outlet removal system, completes one-period and runs
Above denitrification simultaneous phosphorus and nitrogen removal advanced treatment system builds crucial operation condition parameter: a cycle of operation of reactor is 24h, be specially anoxic and filter period 20 ~ 23h-anaerobic phosphorus release period 0.5 ~ 3h-back flushing period 5 ~ 15min, wherein release phosphorus period every 2d and carry out 1 time; It is 100L/h that reactor runs flow velocity; Reactor backwash rate: gas flushing intensity 15L/ (m
2s) ~ 25L/ (m
2s), water backwash rate 10L/ (m
2s) ~ 15L/ (m
2s), air water associating flush time is 8min ~ 10min.Above-mentioned operation condition can define the environment of anaerobic/anoxic alternate run in filter tank, is effectively enriched denitrifying bacteria and Denitrifying Phosphate Accumulating Organisms.
In the structure of described system, high requirement is provided with to reactor, the quartz sand filler 1.5m ~ 2m arranged in reactor is high, particle diameter is 2mm ~ 8mm, and controls water level filtrate having 1m ~ 1.2m, the flow rate kept constant of hypoxic-ischemic brain-damage simultaneously; Ensure to provide good growing environment for the growth of Denitrifying Phosphate Accumulating Organisms
The anoxic filter tank biological treatment system successfully constructed by present method, to water inlet BOD
5the sewage of be 100 ~ 120mg/L, TN to be 16 ~ 20mg/L, TP be 0.6 ~ 1.2mg/L has the ability of stronger simultaneous phosphorus and nitrogen removal.
With the present invention, there is following advantages:
(1) reactor for treatment usefulness is high
The present invention is by setting up anaerobic phosphorus release section, and reactor adopt " anoxic filter period-anaerobic phosphorus release period-the back flushing period " cycle operation mode, form anoxic-anaerobism alternate run operating mode in the reactor, effectively be enriched Denitrifying Phosphate Accumulating Organisms, the synchronous removal to nitrogen and phosphorus is achieved in anoxic filter tank, solving conventional denitrification filter tank can not the problem of synchronously dephosphorization when denitrification denitrogenation, and water outlet can reach Water Environment Standards, significantly improves reactor for treatment usefulness.
(2) technical process is short, operational management is easy
Reactor of the present invention adopts " anoxic filter period-anaerobic phosphorus release period-the back flushing period " cycle operation mode, in single-stage reactor, define anoxic-anaerobism alternate run operating mode, achieve denitrification denitrogenation and inhale phosphorus course synchronization and carry out.Solve the process of existing Sewage Plant Tailwater Depth dephosphorization denitrogenation, need before filter tank, arrange flocculation, depositing technology unit, the problem of sewerage advanced treatment process long flow path, operational management complexity; And this single-stage denitrification simultaneous phosphorus and nitrogen removal system, also overcome conventional denitrification dephosphorization process cell process multipaths long, return-flow system is many, the problem of operational management complexity.
(3) low, the investment of energy consumption, running cost is high
Single-stage anoxic filter tank of the present invention simultaneous phosphorus and nitrogen removal system, solves the investment of traditional wastewater deep phosphorous removal denitrification process long flow path high, adds the problem that Chemical treatment cost is high.
As fully visible, the present invention has that degree of depth simultaneous phosphorus and nitrogen removal usefulness is high, technical process is short, investment and the low advantage of running cost, for Sewage Plant Tailwater Depth dephosphorization denitrogenation opens new way.
Embodiment
Be described in further detail below in conjunction with embodiment:
A construction process for hypoxic-ischemic brain-damage denitrification simultaneous phosphorus and nitrogen removal advanced treatment system, can implement according to the following steps:
1. adopt Continuous Flow hypoxic-ischemic brain-damage as reactor, inside establish quartz sand filler, bottom water inlet top water outlet, does not establish oxygenation facility.Particularly, quartz sand filler 1.5m ~ 2m is high, particle diameter is 1mm ~ 8mm, and controls water level filtrate having about 1m ~ 1.2m, meanwhile, and the flow rate kept constant of hypoxic-ischemic brain-damage.
2. filter period 20 ~ 23h: will be back to back in reactor containing nitre nitrogen and the sewage having added carbon source, in filtration procedure, carry out simultaneous phosphorus and nitrogen removal by the denitrifying bacteria of natural enrichment in reactor quartz sand filter media layer and Denitrifying Phosphate Accumulating Organisms, water inlet C/N is 5 ~ 6 than control.
3. release phosphorus period 0.5 ~ 3h: after reactor runs for some time, stop water inlet, before back flushing, increase anaerobic phosphorus release section, form the environment of anaerobic-anoxic alternate run in the reactor, gathering denitrifying polyP bacteria, and the carbon source adding abundance in the reactor makes polyP bacteria fully release phosphorus.
4., after the anaerobic phosphorus release period terminates, reactor enters the back flushing stage, reactor backwash rate: gas flushing intensity 15L/ (m
2s) ~ 25L/ (m
2s), water backwash rate 10L/ (m
2s) ~ 15L/ (m
2s), air water associating flush time is 8min ~ 10min, and rich phosphorus sewage, with back flushing water outlet removal system, completes one-period and runs;
It is one-period that reactor runs 24h, wherein releases every 2 days of phosphorus period and carries out 1 time, and it is 100L/h that reactor runs flow velocity.Above-mentioned operation condition can form the environment of anaerobic/anoxic alternate run in filter tank, effective gathering denitrifying bacterium and Denitrifying Phosphate Accumulating Organisms.
Embody rule example: be 0.96kgTN/ (m at water temperature 25 DEG C ~ 30 DEG C, hydraulic load 3m/h, nitrogen load
3d), C/N ratio is 6.0, the reactor cycle of operation is 24h, concrete operating mode is under filtering period 23h-release phosphorus period 1h-back flushing period 8min condition, water outlet COD, TN, TP concentration is respectively 35mg/L, 1.83mg/L, 0.1mg/L, clearance is respectively 70.92%, 91.06%, 88%, and effluent quality reaches water environment quality standard V class water body standard.
Visible, the hypoxic-ischemic brain-damage denitrification simultaneous phosphorus and nitrogen removal advanced treatment system that present method constructs, has higher simultaneous phosphorus and nitrogen removal usefulness.
Claims (3)
1. a construction process for hypoxic-ischemic brain-damage denitrification simultaneous phosphorus and nitrogen removal advanced treatment system, is characterized in that comprising step as follows:
(1) adopt Continuous Flow hypoxic-ischemic brain-damage as reactor, inside establish quartz sand filler, bottom water inlet top water outlet, does not establish oxygenation facility; Quartz sand filler 1.5m ~ the 2m arranged in described reactor is high, particle diameter is 2mm ~ 8mm, and controls water level filtrate having 1m ~ 1.2m, simultaneously the flow rate kept constant of hypoxic-ischemic brain-damage;
(2) by being back to back in reactor containing nitric nitrogen and the sewage having added carbon source, in filtration procedure, carry out simultaneous phosphorus and nitrogen removal by the Denitrifying Phosphate Accumulating Organisms of enrichment natural in quartz sand filter media layer, water inlet C/N ratio is 5 ~ 6;
(3) after reactor runs for some time, stop water inlet, before back flushing, increase anaerobic phosphorus release section, form the environment of anaerobic-anoxic alternate run in the reactor, gathering denitrifying polyP bacteria, and the carbon source adding abundance in the reactor makes polyP bacteria fully release phosphorus;
(4), after the anaerobic phosphorus release period terminates, reactor enters the back flushing stage, reactor backwash rate: gas flushing intensity 15L/ (m
2s) ~ 25L/ (m
2s), water backwash rate 10L/ (m
2s) ~ 15L/ (m
2s), air water associating flush time is 8min ~ 10min, and rich phosphorus sewage, with back flushing water outlet removal system, completes one-period and runs;
A cycle of operation of described reactor is 24h, is specially and filters period 20 ~ 23h-release phosphorus period 0.5 ~ 3h-back flushing period 5 ~ 15min, wherein release phosphorus period every 2d and carry out 1 time;
Above-mentioned operation condition can form the environment of anaerobic-anoxic alternate run in hypoxic-ischemic brain-damage, for Denitrifying Phosphate Accumulating Organisms creates good growing environment, and effective gathering denitrifying polyP bacteria.
2. the construction process of hypoxic-ischemic brain-damage denitrification simultaneous phosphorus and nitrogen removal advanced treatment system according to claim 1, is characterized in that: it is 100L/h filtering velocity that reactor runs flow velocity.
3. the construction process of hypoxic-ischemic brain-damage denitrification simultaneous phosphorus and nitrogen removal advanced treatment system according to claim 1, is characterized in that: the water inlet BOD of described reactor
5be 100 ~ 120mg/L, TN be 16 ~ 20mg/L, TP be 0.6 ~ 1.2mg/L.
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Cited By (2)
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| CN107381802A (en) * | 2017-07-12 | 2017-11-24 | 同济大学 | A kind of efficient denitrogenation dephosphorizing sewage water treatment method |
| CN108423823A (en) * | 2018-05-03 | 2018-08-21 | 广东溢达纺织有限公司 | A kind of while biological carbon and phosphorous removal device and method |
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| CN108423823A (en) * | 2018-05-03 | 2018-08-21 | 广东溢达纺织有限公司 | A kind of while biological carbon and phosphorous removal device and method |
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