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Cavitation oxidation process and activated sludge process combined sewage treatment system and method thereof
Description
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Technical field
The invention belongs to sewage treatment area, relate to particularly the Sewage treatment systems of combining of a kind of combination cavitation oxidation style and activated sludge process.
The invention still further relates to the method for 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 has formed 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, the traditional method that municipal sewage treatment both at home and abroad generally adopts coagulation and second-stage treatment to combine.Coagulation adopts physical method, mainly by grid tackle, the material such as bulk suspended substance and sand grains in the means removal waste water such as precipitation.Second-stage treatment adopts activated sludge process, and mainly the means such as life movement by microorganism remove the suspension in waste water, the nutritive salt such as dissolved organic matter and nitrogen, phosphorus.
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, harmful synthetic chemical substance and hardly degraded organic substance increasing year by year in water, single activated sludge method processing technique cannot meet the environmental requirement day by day improving.On the other hand, activated sludge process can produce a large amount of excess sludges when disposing of sewage, and its volume is about 0.3%～0.5% of the volume of disposing of sewage, and the cost of 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 sewage treatment industry.
In view of the problem that activated sludge process faces, countries in the world are all in 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, further dilution need to consume great lot of water resources, although and photocatalytic oxidation oxidation efficiency is higher, medicament expense with high, reaction unit is complicated, and easily causes secondary pollution.Cavitation oxidation style only can effectively be removed many hard-degraded substances and toxic substance, and has the plurality of advantages such as non-secondary pollution, reaction unit be simple, is in recent years more concerned new type water treatment process.
Cavitation phenomenon refers to when liquid internal local pressure is reduced to saturation vapour pressure corresponding to fluid temperature, the process that in liquid or in liquid-solid interface, steam or gas cavities (cavitation bubble) form, grow and crumble and fall.Scientific research shows, cavitation bubble moment of crumbling and fall rapidly can form localized hyperthermia's hyperbaric environment (10 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
The cavitation bubble formed jet of crumbling and fall makes these free radicals and oxygenant enter liquid phase fully to mix with liquid, thus with liquid in Persistent organic pollutants generation oxidizing reaction, realize sewage disposal.The cavitation bubble powerful shearing force forming that crumbles and fall also can make carbon bond fracture and the destroy microorganisms cell walls on macromolecular main chain, thereby reaches degraded macromolecular and make microorganism deactivated effect, realizes the purification of water quality.
At present, about the device that utilizes cavitation oxidation technology to dispose of sewage, there are a lot of related application (as CN201310290527, CN201310180381, CN201320138508), but because the organic matter removal efficiency of cavitation oxidation technology integral body is not also very high (50% left and right), 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 and the method for combination cavitation oxidation style and activated sludge process, this Sewage treatment systems combines activated sludge process and cavitation oxidation style advantage separately, for reducing sewage discharge limit value and reducing active sludge output, provides a practicable approach.
Summary of the invention
The object of the present invention is to provide the Sewage treatment systems of combining of a kind of combination cavitation oxidation style and activated sludge process.
Another object of the present invention is to provide a kind of method of utilizing said system to carry out sewage disposal.
For achieving the above object, the Sewage treatment systems of combining of combination cavitation oxidation style provided by the invention 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 in a cavitation process pond;
The water outlet in this cavitation process pond 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 in the water outlet connecting secondary cavitation process pond of secondary sedimentation basins;
Wherein:
A cavitation process pond is connected with the first Cavitation device by the first water pump and forms circulation;
Secondary cavitation process pond is connected with the second Cavitation device by the second water pump and forms circulation.
Described combination cavitation oxidation style and the Sewage treatment systems of combining of activated sludge process, wherein, the water outlet in a cavitation process pond is provided with the first gate, by this first gate, a cavitation process liquid is back in a cavitation process pond.
Described combination cavitation oxidation style and the Sewage treatment systems of combining of activated sludge process, wherein, the water outlet in secondary cavitation process pond is provided with the 3rd gate and the 4th gate, by the 3rd gate, secondary cavitation process liquid is back in secondary cavitation process pond.
Described combination cavitation oxidation style and the Sewage treatment systems of combining of activated sludge process, wherein, primary sedimentation basin and secondary sedimentation basins are provided with mud discharging mouth.
The method that Sewage treatment systems is carried out sewage disposal of combining of utilizing above-mentioned combination cavitation oxidation style and activated sludge process provided by the invention, its process is:
1) sewage relies on the interception function of grid to remove the bulk suspended substance in liquid, then enter primary sedimentation basin, in primary sedimentation basin, sewage is through precipitating action, remove tiny suspended substance and the sand grains of size in liquid, the first mud forming is excluded, and the sewage after precipitating action enters cavitation process pond one time;
2) in a cavitation process pond, the first water pump extracts sewage from a cavitation process pond, 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 is got back to cavitation process pond one time, with this, circulates;
3) sewage after process in a cavitation process pond, a part is again back to a cavitation process pond and processes, and residue sewage flows into aeration tank and carries out biological degradation processing;
4) sewage after the biological degradation of aeration tank enters secondary sedimentation basins and carries out entering secondary cavitation process pond after mud-water separation; 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 process pond, the second water pump extracts sewage from secondary cavitation process pond, 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 is got back to secondary cavitation process pond, with this, circulates;
6) sewage after process in secondary cavitation process pond, a part is again back to secondary cavitation process pond and processes, and residue sewage is got rid of.
Described sewage water treatment method, wherein, the flow of the residence time of sewage in a cavitation process pond and in secondary cavitation process pond by sewage load and water pump determines.
Described sewage water treatment method, wherein, rotproofing is done in the first water pump and the second water pump inside, and more than top hole pressure maintains 4.0bar.
Described sewage water treatment method, wherein, effluent stream is crossed the flow velocity of the first Cavitation device and the second Cavitation device can not be lower than 20 meter per seconds.
Described sewage water treatment method, wherein, a cavitation process liquid of backflow can be controlled by the first gate and the second gate with the sewage quantity ratio that enters aeration tank, to regulate COD and the BOD that enters 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 can be controlled by the 3rd gate and the 4th gate, to regulate COD and the BOD of final sewage effluent
5concentration.
The present invention has the following advantages:
1, cavitation is oxidized dirty method sewage treatment process and device is comparatively simple, is very easy to form process integration with existing activated sludge method processing technique, and this process integration has retained 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, realize 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, thereby 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 the aeration tank, COD and BOD that aeration tank enters water have been reduced
5concentration.Meanwhile, can suitably improve COD and the BOD of aeration tank water outlet
5concentration, makes the sewage disposal load reduction of aeration tank, thereby significantly reduces the growing amount of residual active sludge, saves the later stage cost of disposal of mud.
Accompanying drawing explanation
Fig. 1 be combination cavitation oxidation style of the present invention with activated sludge process combine Sewage treatment systems figure.
Primary clustering nomenclature in accompanying drawing:
1 filtering grid, 2 primary sedimentation basins, 3 cavitation process ponds, 4 first water pumps, 5 first Cavitation devices, 6 first gates, 7 second gates, 8 aeration tanks, 9 secondary sedimentation basinss, 10 2 cavitation process ponds, 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 in a cavitation process pond 3, the water outlet in this cavitation process pond 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 in the water outlet connecting secondary cavitation process pond 10 of secondary sedimentation basins 9.
A cavitation process pond 3 is connected with the first Cavitation device 5 by the first water pump 4 and forms circulation; Secondary cavitation process pond 10 is connected with the second Cavitation device 12 by the second water pump 11 and forms circulation.
The water outlet in a cavitation process pond 3 is provided with the first gate 6, by this first gate 6, a cavitation process liquid is back in a cavitation process pond 3.
The water outlet in secondary cavitation process pond 10 is provided with the 3rd gate 13 and the 4th gate 14, by the 3rd gate 13, secondary cavitation process liquid is back in secondary cavitation process pond 10.
Sewage disposal flow process of the present invention is as follows:
Sewage, first by filtering grid 1, relies on the interception function of grid to remove the bulk suspension in liquid, then enters primary sedimentation basin 2.Through precipitating action, effectively remove the materials such as the tiny suspended substance of size in sewage and sand grains, the first mud of formation is excluded, and sewage after primary sedimentation enters cavitation process pond 3 one time.Sewage in a cavitation process pond 3 after first cavitation oxide treatment operation, COD and BOD
5concentration significantly reduces.Through the post-oxidation sewage of cavitation for the first time, a part is again back in a cavitation process pond 3 and processes, and remainder flows into aeration tank 8 and carries out biological degradation processing.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 process pond 10, carries out second cavitation oxide treatment operation.Through after cavitation oxygenizement for the second time, a part of sewage is again back in secondary cavitation process pond 10 and processes, and residue sewage is directly got rid of, and according to final emission request, carries out subsequent disposal.
Sewage is realized the cavitation Oxidative Degradation Process of organic pollutant, the 8 interior biodegradation processes of realizing sewage in aeration tank in cavitation process pond 3 and secondary cavitation process pond 10.In cavitation process pond 3 and secondary cavitation process pond 10, the detailed process that sewage is realized cavitation oxidative degradation is: the first water pump 4 and the second water pump 11 extract sewage respectively from cavitation process pond 3 and secondary cavitation process pond 10, and are 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 process pond.
In more detail, sewage water treatment method of the present invention, mainly comprises following process step:
1) sewage, first by filtering grid 1, relies on the interception function of grid to remove the bulk suspended substance in liquid, then enters primary sedimentation basin 2.
2) in primary sedimentation basin 2, sewage is through precipitating action, and in liquid, the material such as the tiny suspended substance of size and sand grains is effectively removed, and the first mud of formation is excluded, and the sewage after precipitating action enters cavitation process pond 3 one time.
3) in a cavitation process pond 3, sewage is through first cavitation oxidation operation, and organic pollutant is degraded, COD and BOD
5concentration significantly reduces; Detailed process is:
The first water pump 4 extracts sewage from a cavitation process pond 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 is got back to cavitation process pond 3 one time, so circulation.
The residence time of sewage in a cavitation process pond 3 determines according to the flow of the sewage load of system and the first water pump 4.
Rotproofing need be done in the first water pump 4 inside, and more than top hole pressure wants to maintain 4.0bar.
The flow velocity that effluent stream is crossed the first Cavitation device 5 is not less than 20 meter per seconds.
4) sewage flowing out from cavitation process pond 3 outlets, a part is again back to a cavitation process pond and processes, and remainder sewage flows into aeration tank 8 and carries out biological degradation processing.The cavitation process liquid refluxing can be controlled by the first gate 6 and the second gate 7 that are arranged in runner with the sewage quantity ratio that enters aeration tank, to regulate COD and the BOD that enters aeration tank sewage
5concentration.
5) sewage after the biological degradation of aeration tank enters secondary sedimentation basins 9, carry out entering secondary cavitation process pond 10 after 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, COD and BOD in secondary cavitation process pond 10
5concentration further reduces, and treating processes and step (3) are similar.
The second water pump 11 extracts sewage from secondary cavitation process pond 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 is got back to secondary cavitation process pond 10, so circulation.
The residence time of sewage in secondary cavitation process pond 10 determines according to the flow of the sewage load of system and the second water pump 11; More than the top hole pressure of the second water pump 11 must maintain 4.0bar; The flow velocity that effluent stream is crossed the second Cavitation device 12 is not less than 20 meter per seconds.
7) sewage flowing out from the 10 pond outlets of secondary cavitation process, a part is again back to secondary cavitation process pond and processes, and remainder sewage is directly got rid of, and according to emission request, carries out subsequent disposal.Ratio between the secondary cavitation process liquid refluxing and final sewage effluent amount can be controlled by the 3rd gate 13 and the 4th gate 14 that are arranged in runner, to regulate COD and the 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 that embodiments of the present invention are only for therewith, any substitute mode of making without departing from the inventive concept of the premise is all considered as the definite protection domain of claim that the present invention submits to.
Claims (9)
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Claims (9)
Hide Dependent
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1. the Sewage treatment systems of combining with activated sludge process in conjunction with cavitation oxidation style, 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 in a cavitation process pond;
The water outlet in this cavitation process pond 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 in the water outlet connecting secondary cavitation process pond of secondary sedimentation basins;
Wherein:
A cavitation process pond is connected with the first Cavitation device by the first water pump and forms circulation;
Secondary cavitation process pond is connected with the second Cavitation device by the second water pump and forms circulation.
2. the Sewage treatment systems of combining of combination cavitation oxidation style as claimed in claim 1 and activated sludge process, wherein, the water outlet in a cavitation process pond is provided with the first gate, by this first gate, a cavitation process liquid is back in a cavitation process pond.
3. the Sewage treatment systems of combining of combination cavitation oxidation style as claimed in claim 1 and activated sludge process, wherein, the water outlet in secondary cavitation process pond is provided with the 3rd gate and the 4th gate, by the 3rd gate, secondary cavitation process liquid is back in secondary cavitation process pond.
4. utilize described in claim 1 method that Sewage treatment systems is carried out sewage disposal of combining with activated sludge process in conjunction with cavitation oxidation style, its process is:
1) sewage relies on the interception function of grid to remove the bulk suspended substance in liquid, then enter primary sedimentation basin, in primary sedimentation basin, sewage is through precipitating action, remove tiny suspended substance and the sand grains of size in liquid, the first mud forming is excluded, and the sewage after precipitating action enters cavitation process pond one time;
2) in a cavitation process pond, the first water pump extracts sewage from a cavitation process pond, 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 is got back to cavitation process pond one time, with this, circulates;
3) sewage after process in a cavitation process pond, a part is again back to a cavitation process pond and processes, and residue sewage flows into aeration tank and carries out biological degradation processing;
4) sewage after the biological degradation of aeration tank enters secondary sedimentation basins and carries out entering secondary cavitation process pond after mud-water separation; 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 process pond, the second water pump extracts sewage from secondary cavitation process pond, 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 is got back to secondary cavitation process pond, with this, circulates;
6) sewage after process in secondary cavitation process pond, a part is again back to secondary cavitation process pond and processes, and residue sewage is got rid of.
5. sewage water treatment method according to claim 5, wherein, the flow of the residence time of sewage in a cavitation process pond and in secondary cavitation process pond by sewage load and water pump determines.
6. sewage water treatment method according to claim 5, wherein, rotproofing is done in the first water pump and the second water pump inside, and more than top hole pressure maintains 4.0bar.
7. sewage water treatment method according to claim 5, wherein, the flow velocity that effluent stream is crossed the first Cavitation device and the second Cavitation device is not less than 20 meter per seconds.
8. sewage water treatment method according to claim 5, wherein, a cavitation process liquid of backflow can be controlled by the first gate and the second gate with the sewage quantity ratio that enters aeration tank, to regulate COD and the BOD that enters aeration tank sewage
5concentration.
9. sewage water treatment method according to claim 5, wherein, the ratio between the secondary cavitation process liquid of backflow and final sewage effluent amount can be controlled by the 3rd gate and the 4th gate, to regulate COD and the BOD of final sewage effluent
5concentration.