CN103663868B - Sewage treatment systems and method is combined in conjunction with cavitation oxidation style and activated sludge process - Google Patents
Sewage treatment systems and method is combined in conjunction with cavitation oxidation style and activated sludge process Download PDFInfo
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- CN103663868B CN103663868B CN201310643309.8A CN201310643309A CN103663868B CN 103663868 B CN103663868 B CN 103663868B CN 201310643309 A CN201310643309 A CN 201310643309A CN 103663868 B CN103663868 B CN 103663868B
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Abstract
Combine a Sewage treatment systems in conjunction with cavitation oxidation style and activated sludge process, comprising: the water outlet of a filtering grid connects the water-in of primary sedimentation basin; The water outlet of this primary sedimentation basin connects the water-in of a cavitation treatment pool; The water outlet of this cavitation treatment pool connects the water-in of aeration tank by the second gate; The water-in of the water outlet connecting secondary settling tank of aeration tank; The water-in of the water outlet connecting secondary cavitation treatment pool of secondary sedimentation basins; Cavitation treatment pool is connected to be formed with the first Cavitation device by the first water pump and circulates; Secondary cavitation treatment pool is connected to be formed with the second Cavitation device by the second water pump and circulates.The invention also discloses the method utilizing said system to carry out sewage disposal.The present invention can significantly reduce sewage discharge limit value, reduces residual active sludge output, meets the environmental requirement and saving sludge disposal cost that day by day improve.
Description
Technical field
The invention belongs to sewage treatment area, relate to particularly and a kind ofly combine Sewage treatment systems in conjunction with cavitation oxidation style and activated sludge process.
The invention still further relates to the method utilizing said system to carry out sewage disposal.
Background technology
Water is one of important factor of Sustainable Socioeconomic Development.Along with the continuous expansion of city size and the increase of population, social economy's development, quantity of wastewater effluent grows with each passing day, and water pollution problems constitutes serious threat to human survival and social development, and municipal effluent has become the one of the main reasons of restriction urban sustainable development.At present, domestic and international municipal sewage treatment generally adopts the traditional method that coagulation and second-stage treatment combine.Coagulation adopts physical method, removes the material such as bulk suspended substance and sand grains in waste water mainly through means such as grid interception, precipitations.Second-stage treatment then adopts activated sludge process, and the means such as life movement mainly through microorganism remove suspension, dissolved organic matter and the nutritive salt such as nitrogen, phosphorus in waste water.
The advantage of single activated sludge method processing technique is the solubility easily biodegradable organics (BOD in degradation of sewage
5), and mainly relying on adsorption to remove for Persistent organic pollutants, effect is not satisfactory.Along with developing rapidly of industry, synthetic chemical substance harmful in water and hardly degraded organic substance increase year by year, and single activated sludge method processing technique cannot meet the environmental requirement day by day improved.On the other hand, activated sludge process can produce a large amount of excess sludge while disposing of sewage, and its volume is about 0.3% ~ 0.5% of volume of disposing of sewage, and the cost disposing these excess sludges is very high, accounts for 25% ~ 65% of sewage work's working cost.Renminbi is amounted to into up to 2,800,000,000 yuan for the treatment of the expense of excess sludge every year by European countries.In addition, a large amount of municipal sludges produces, and has caused the secondary pollution of environment, has become the bottleneck of municipal wastewater treatment field.
In view of activated sludge process problems faced, countries in the world all research and development some new sewage disposal technology and techniques, as hydrolysis method, photocatalytic oxidation, cavitation oxidation style etc.
Hydrolysis method acid and alkali consumption amount is large, and after hydrolysis, dilution needs to consume great lot of water resources further, although and photocatalytic oxidation oxidation efficiency is higher, medicament is costly, reaction unit is complicated, and easily causes secondary pollution.Cavitation oxidation style only can effectively remove many hard-degraded substances and toxic substance, and has the plurality of advantages such as non-secondary pollution, reaction unit be simple, is new type water treatment process more concerned in recent years.
Cavitation phenomenon refers to when liquid internal local pressure is reduced to saturation vapour pressure corresponding to fluid temperature, in a liquid or the process that in liquid-solid interface, steam or gas cavities (cavitation bubble) are formed, grow and crumble and fall.Scientific research shows, cavitation bubble is crumbled and fall rapidly can form localized hyperthermia's hyperbaric environment (10 instantaneously in liquid medium
4the high temperature of K magnitude and 10
5the high pressure of bar magnitude), and with intense impact ripple and high-speed jet.The water vapor of cavitation bubble inside, in high temperature, the raw scission reaction of elevated pressure, produces hydroxy radical qiao OH and the strong oxidizer H of overactivity
2o
2:
H
2O→·OH+·H
·OH+·OH→H
2O
2
Cavitation bubble formed jet of crumbling and fall makes these free radicals and oxygenant enter liquid phase fully to mix with liquid, thus with the Persistent organic pollutants generation oxidizing reaction in liquid, realize sewage disposal.The cavitation bubble powerful shearing force formed that crumbles and fall also can make carbon bonds on macromolecular main chain and destroy microorganisms cell walls, thus reaches degraded macromolecular and make microorganism deactivated effect, realizes the purification of water quality.
At present, a lot of related application is had (as CN201310290527 about the device utilizing cavitation oxidation technology to dispose of sewage, CN201310180381, CN201320138508), but because the organic matter removal efficiency of cavitation oxidation technology entirety is not also very high (about 50%), only rely on single cavitation waste disposal plant and technique not to reach the emission request of sewage disposal far away.For this reason, the present invention proposes a kind of associating Sewage treatment systems in conjunction with cavitation oxidation style and activated sludge process and method, this Sewage treatment systems combines activated sludge process and cavitation oxidation style advantage separately, provides a practicable approach for reducing sewage discharge limit value and reducing active sludge output.
Summary of the invention
The object of the present invention is to provide and a kind ofly combine Sewage treatment systems in conjunction with cavitation oxidation style and activated sludge process.
Another object of the present invention is to provide a kind of method utilizing said system to carry out sewage disposal.
For achieving the above object, provided by the inventionly combine Sewage treatment systems in conjunction with cavitation oxidation style and activated sludge process, comprising:
The water outlet of one filtering grid connects the water-in of primary sedimentation basin;
The water outlet of this primary sedimentation basin connects the water-in of a cavitation treatment pool;
The water outlet of this cavitation treatment pool connects the water-in of aeration tank by the second gate;
The water-in of the water outlet connecting secondary settling tank of aeration tank;
The water-in of the water outlet connecting secondary cavitation treatment pool of secondary sedimentation basins;
Wherein:
Cavitation treatment pool is connected to be formed with the first Cavitation device by the first water pump and circulates;
Secondary cavitation treatment pool is connected to be formed with the second Cavitation device by the second water pump and circulates.
Described combine Sewage treatment systems in conjunction with cavitation oxidation style and activated sludge process, wherein, the water outlet of a cavitation treatment pool is provided with the first gate, is back in a cavitation treatment pool by a cavitation process liquid by this first gate.
Described combine Sewage treatment systems in conjunction with cavitation oxidation style and activated sludge process, wherein, the water outlet of secondary cavitation treatment pool is provided with the 3rd gate and the 4th gate, is back in secondary cavitation treatment pool by secondary cavitation process liquid by the 3rd gate.
Described combine Sewage treatment systems in conjunction with cavitation oxidation style and activated sludge process, wherein, primary sedimentation basin and secondary sedimentation basins are provided with mud discharging mouth.
Provided by the invention utilization above-mentionedly combines in conjunction with cavitation oxidation style and activated sludge process the method that Sewage treatment systems carries out sewage disposal, and its process is:
1) sewage relies on the bulk suspended substance in the interception function removal liquid of grid, then primary sedimentation basin is entered, in primary sedimentation basin, sewage is through precipitating action, the suspended substance that in removing liquid, size is tiny and sand grains, the first mud formed is excluded, and the sewage after precipitating action enters a cavitation treatment pool;
2) in a cavitation treatment pool, first water pump extracts sewage from a cavitation treatment pool, and send in the first Cavitation device, effluent stream when the first Cavitation device due to the metering function of structure, produce cavitation phenomenon, and complete the cavitation oxidising process of organic pollutant, COD and BOD simultaneously
5concentration is reduced; Sewage after cavitation oxidative degradation gets back to a cavitation treatment pool, circulates with this;
3) sewage after a cavitation treatment pool process, a part is again back to a cavitation treatment pool and carries out reprocessing, and residue sewage flows into aeration tank and carries out biological degradation process;
4) sewage after the biological degradation of aeration tank enters after secondary sedimentation basins carries out mud-water separation and enters secondary cavitation treatment pool; In isolated mud, a part is back in aeration tank, and to maintain the activated sludge concentration in aeration tank, all the other mud are excluded;
5) in secondary cavitation treatment pool, second water pump extracts sewage from secondary cavitation treatment pool, and send in the second Cavitation device, effluent stream when the second Cavitation device due to the metering function of structure, produce cavitation phenomenon, and complete the cavitation oxidising process of organic pollutant, COD and BOD simultaneously
5concentration is reduced; Sewage after cavitation oxidative degradation gets back to secondary cavitation treatment pool, circulates with this;
6) sewage after secondary cavitation treatment pool process, a part is again back to secondary cavitation treatment pool and carries out reprocessing, and residue sewage is got rid of.
Described sewage water treatment method, wherein, the residence time of sewage in a cavitation treatment pool and in secondary cavitation treatment pool is determined by the flow of sewage load and water pump.
Described sewage water treatment method, wherein, rotproofing is done in the first water pump and the second water pump inside, and top hole pressure maintains more than 4.0bar.
Described sewage water treatment method, wherein, sewage flows through the flow velocity of the first Cavitation device and the second Cavitation device can not lower than 20 meter per seconds.
Described sewage water treatment method, wherein, a cavitation process liquid of backflow controls by the first gate and the second gate with the sewage quantity ratio entering aeration tank, to regulate COD and BOD entering aeration tank sewage
5concentration.
Described sewage water treatment method, wherein, the ratio between the secondary cavitation process liquid of backflow and final sewage effluent amount controls by the 3rd gate and the 4th gate, to regulate COD and BOD of final sewage effluent
5concentration.
The present invention has the following advantages:
1, to be oxidized dirty method sewage treatment process and device comparatively simple for cavitation, and be very easy to form process integration with existing activated sludge method processing technique, this process integration remains traditional activated sludge process BOD
5the advantage that removal efficiency is higher, will remove the good cavitation oxidation style of hardly degraded organic substance effect simultaneously and introduce in the middle of sewage treatment process, and achieve mutual supplement with each other's advantages, learn from other's strong points to offset one's weaknesses.
2, cavitation oxidation style can realize effective degraded of hardly degraded organic substance in sewage, makes up the deficiency of Wastewater Treated by Activated Sludge Process Persistent organic pollutants, thus significantly reduces the final emission limit of sewage, meets and day by day brings up to environmental requirement.
3, owing to introducing cavitation oxidation style sewage treatment process before and after aeration tank, COD and BOD that aeration tank enters water is reduced
5concentration.Meanwhile, COD and BOD of aeration tank water outlet can suitably be improved
5concentration, makes the sewage treatment load of aeration tank reduce, thus significantly reduces the growing amount of residual active sludge, saves the later stage cost of disposal of mud.
Accompanying drawing explanation
Fig. 1 of the present inventionly combines Sewage treatment systems figure in conjunction with cavitation oxidation style and activated sludge process.
Primary clustering nomenclature in accompanying drawing:
1 filtering grid, 2 primary sedimentation basins, 3 cavitation treatment pool, 4 first water pumps, 5 first Cavitation devices, 6 first gates, 7 second gates, 8 aeration tanks, 9 secondary sedimentation basinss, 10 secondary cavitation treatment pool, 11 second water pumps, 12 second Cavitation devices, 13 the 3rd gates, 14 the 4th gates.
Embodiment
Below in conjunction with accompanying drawing, 1 couple of the present invention is further elaborated.Sewage treatment systems of the present invention comprises:
One filtering grid 1, its water outlet connects the water-in of primary sedimentation basin 2, the water outlet of this primary sedimentation basin 2 connects the water-in of a cavitation treatment pool 3, the water outlet of this cavitation treatment pool 3 connects the water-in of aeration tank 8 by the second gate 7, the water-in of the water outlet connecting secondary settling tank 9 of aeration tank 8, the water-in of the water outlet connecting secondary cavitation treatment pool 10 of secondary sedimentation basins 9.
Cavitation treatment pool 3 is connected to be formed with the first Cavitation device 5 by the first water pump 4 and circulates; Secondary cavitation treatment pool 10 is connected to be formed with the second Cavitation device 12 by the second water pump 11 and circulates.
The water outlet of a cavitation treatment pool 3 is provided with the first gate 6, is back in a cavitation treatment pool 3 by a cavitation process liquid by this first gate 6.
The water outlet of secondary cavitation treatment pool 10 is provided with the 3rd gate 13 and the 4th gate 14, is back in secondary cavitation treatment pool 10 by secondary cavitation process liquid by the 3rd gate 13.
Primary sedimentation basin 2 and secondary sedimentation basins 9 are equipped with mud discharging mouth.
Waste water processes of the present invention is as follows:
Sewage is first by filtering grid 1, and the bulk relying on the interception function of grid to remove in liquid suspends, and then enters primary sedimentation basin 2.Through precipitating action, effectively remove the materials such as the suspended substance that in sewage, size is tiny and sand grains, the first mud of formation is excluded, and the sewage after primary sedimentation enters a cavitation treatment pool 3.Sewage in a cavitation treatment pool 3 after first cavitation oxide treatment operation, COD and BOD
5concentration significantly reduces.Through the post-oxidation sewage of first time cavitation, a part is back in a cavitation treatment pool 3 again carries out reprocessing, and remainder flows into aeration tank 8 and carries out biological degradation process.After the biological degradation of aeration tank, sewage enters secondary sedimentation basins 9 and carries out mud-water separation.Isolated mud, a part is back in aeration tank 8 again, and to maintain the activated sludge concentration in aeration tank 8, rest part is excluded as residual active sludge.Sewage after secondary sedimentation enters secondary cavitation treatment pool 10, carries out second cavitation oxide treatment operation.After second time cavitation oxygenizement, a part of sewage is again back in secondary cavitation treatment pool 10 and carries out reprocessing, and residue sewage is directly got rid of, and carries out subsequent disposal according to final emission request.
Sewage realizes the cavitation Oxidative Degradation Process of organic pollutant in a cavitation treatment pool 3 and secondary cavitation treatment pool 10, realizes the biodegradation process of sewage in aeration tank 8.In a cavitation treatment pool 3 and secondary cavitation treatment pool 10, the detailed process that sewage realizes cavitation oxidative degradation is: the first water pump 4 and the second water pump 11 extract sewage respectively from a cavitation treatment pool 3 and secondary cavitation treatment pool 10, and is sent into the first Cavitation device 5 and the second Cavitation device 12.Sewage forms cavitation phenomenon in two Cavitation devices, produces hydroxy radical qiao OH and strong oxidizer H in liquid
2o
2and with organic pollutant generation oxidizing reaction, realize the degraded of organic pollutant.Sewage after cavatition comes back in first and second cavitation treatment pool.
In more detail, sewage water treatment method of the present invention, mainly comprises following process step:
1) sewage is first by filtering grid 1, relies on the bulk suspended substance in the interception function removal liquid of grid, then enters primary sedimentation basin 2.
2) in primary sedimentation basin 2, sewage is through precipitating action, and the materials such as the suspended substance that in liquid, size is tiny and sand grains are effectively removed, and the first mud of formation is excluded, and the sewage after precipitating action enters a cavitation treatment pool 3.
3) in a cavitation treatment pool 3, sewage is through first cavitation oxidation operation, and organic pollutant is degraded, COD and BOD
5concentration significantly reduces; Detailed process is:
First water pump 4 extracts sewage from a cavitation treatment pool 3, and is sent into the first Cavitation device 5.Effluent stream, when the first Cavitation device 5, due to the metering function of structure, produces cavitation phenomenon, and completes the cavitation oxidising process of organic pollutant simultaneously.Sewage after cavitation oxidative degradation gets back to a cavitation treatment pool 3, so circulates.
The residence time of sewage in a cavitation treatment pool 3 determines according to the flow of the sewage load of system and the first water pump 4.
Rotproofing need be done in first water pump 4 inside, and top hole pressure is wanted to maintain more than 4.0bar.
The flow velocity that sewage flows through the first Cavitation device 5 is not less than 20 meter per seconds.
4) export from a cavitation treatment pool 3 sewage flowed out, a part is again back to a cavitation treatment pool and carries out reprocessing, and remainder sewage flows into aeration tank 8 and carries out biological degradation process.Cavitation process liquid of backflow and the sewage quantity ratio entering aeration tank are by being arranged on the first gate 6 in runner and the second gate 7 controls, to regulate COD and BOD entering aeration tank sewage
5concentration.
5) sewage after the biological degradation of aeration tank enters secondary sedimentation basins 9, secondary cavitation treatment pool 10 is entered after carrying out mud-water separation, isolated mud, a part is back in aeration tank 8 again, to maintain the activated sludge concentration in aeration tank, rest part is excluded as residual active sludge.
6) sewage carries out second cavitation oxidative degradation operation in secondary cavitation treatment pool 10, COD and BOD
5concentration reduces further, treating processes and step (3) similar.
Second water pump 11 extracts sewage from secondary cavitation treatment pool 10, and is sent into the second Cavitation device 12.Effluent stream, when the second Cavitation device 12, due to the metering function of structure, produces cavitation phenomenon, completes the cavitation Oxidative Degradation Process of organic pollutant.Sewage after cavitation oxidative degradation gets back to secondary cavitation treatment pool 10, so circulates.
The residence time of sewage in secondary cavitation treatment pool 10 determines according to the flow of the sewage load of system and the second water pump 11; The top hole pressure of the second water pump 11 must maintain more than 4.0bar; The flow velocity that sewage flows through the second Cavitation device 12 is not less than 20 meter per seconds.
7) from the sewage that the outlet of secondary cavitation process 10 pond is flowed out, a part is again back to secondary cavitation treatment pool and carries out reprocessing, and remainder sewage is directly got rid of, and carries out subsequent disposal according to emission request.Ratio between the secondary cavitation process liquid of backflow and final sewage effluent amount is by being arranged on the 3rd gate 13 in runner and the 4th gate 14 controls, to regulate COD and BOD of final sewage effluent
5concentration.
Above content is in conjunction with a specific embodiment further elaboration made for the present invention; do not represent embodiments of the present invention only for therewith, any substitute mode made without departing from the inventive concept of the premise is all considered as the protection domain that claim that the present invention submits to is determined.
Claims (5)
1. utilization combines in conjunction with cavitation oxidation style and activated sludge process the method that Sewage treatment systems carries out sewage disposal, describedly comprises with the Sewage treatment systems of combining of activated sludge process in conjunction with cavitation oxidation style:
The water outlet of one filtering grid connects the water-in of primary sedimentation basin;
The water outlet of this primary sedimentation basin connects the water-in of a cavitation treatment pool;
The water outlet of this cavitation treatment pool connects the water-in of aeration tank by the second gate;
The water-in of the water outlet connecting secondary settling tank of aeration tank;
The water-in of the water outlet connecting secondary cavitation treatment pool of secondary sedimentation basins;
Wherein:
Cavitation treatment pool is connected to be formed with the first Cavitation device by the first water pump and circulates; The water outlet of this cavitation treatment pool is provided with the first gate, is back in a cavitation treatment pool by this first gate by a cavitation process liquid; And
Secondary cavitation treatment pool is connected to be formed with the second Cavitation device by the second water pump and circulates; The water outlet of this secondary cavitation treatment pool is provided with the 3rd gate and the 4th gate, is back in secondary cavitation treatment pool by the 3rd gate by secondary cavitation process liquid;
The method of described sewage disposal comprises following process:
1) sewage relies on the bulk suspended substance in the interception function removal liquid of filtering grid, then primary sedimentation basin is entered, in primary sedimentation basin, sewage is through precipitating action, the suspended substance that in removing liquid, size is tiny and sand grains, the first mud formed is excluded, and the sewage after precipitating action enters a cavitation treatment pool;
2) in a cavitation treatment pool, first water pump extracts sewage from a cavitation treatment pool, and send in the first Cavitation device, effluent stream when the first Cavitation device due to the metering function of structure, produce cavitation phenomenon, and complete the cavitation oxidising process of organic pollutant, COD and BOD simultaneously
5concentration is reduced; Sewage after cavitation oxidative degradation gets back to a cavitation treatment pool, circulates with this;
The top hole pressure of the first water pump maintains more than 4.0bar;
The flow velocity that sewage flows through the first Cavitation device is not less than 20 meter per seconds;
3) sewage after a cavitation treatment pool process, a part is again back to a cavitation treatment pool and carries out reprocessing, and residue sewage flows into aeration tank and carries out biological degradation process;
4) sewage after the biological degradation of aeration tank enters after secondary sedimentation basins carries out mud-water separation and enters secondary cavitation treatment pool; In isolated mud, a part is back in aeration tank, and to maintain the activated sludge concentration in aeration tank, all the other mud are excluded;
5) in secondary cavitation treatment pool, second water pump extracts sewage from secondary cavitation treatment pool, and send in the second Cavitation device, effluent stream when the second Cavitation device due to the metering function of structure, produce cavitation phenomenon, and complete the cavitation oxidising process of organic pollutant, COD and BOD simultaneously
5concentration is reduced; Sewage after cavitation oxidative degradation gets back to secondary cavitation treatment pool, circulates with this;
The top hole pressure of the second water pump maintains more than 4.0bar;
The flow velocity that sewage flows through the second Cavitation device is not less than 20 meter per seconds;
6) sewage after secondary cavitation treatment pool process, a part is again back to secondary cavitation treatment pool and carries out reprocessing, and residue sewage is got rid of.
2. the method for sewage disposal according to claim 1, wherein, the residence time of sewage in a cavitation treatment pool and in secondary cavitation treatment pool is determined by the flow of sewage load and water pump.
3. the method for sewage disposal according to claim 1, wherein, rotproofing is done in the first water pump and the second water pump inside.
4. the method for sewage disposal according to claim 1, wherein, a cavitation process liquid of backflow controls by the first gate and the second gate with the sewage quantity ratio entering aeration tank, to regulate COD and BOD entering aeration tank sewage
5concentration.
5. the method for sewage disposal according to claim 1, wherein, the ratio between the secondary cavitation process liquid of backflow and final sewage effluent amount controls by the 3rd gate and the 4th gate, to regulate COD and BOD of final sewage effluent
5concentration.
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| CN107032514A (en) * | 2016-01-08 | 2017-08-11 | 浙江工业大学 | With the cavitation and cavitation erosion water treatment system for removing Recalcitrant chemicals and sterilizing function |
| CN105967413A (en) * | 2016-07-25 | 2016-09-28 | 杨阳 | Polished-wastewater integrated treatment device |
| CN108516656A (en) * | 2018-07-06 | 2018-09-11 | 张渝文 | A kind of activated sludge small-sized sewage treating system |
| US11834357B2 (en) * | 2020-04-15 | 2023-12-05 | Michael Kelsey | Water treatment system |
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