CN1093427C

CN1093427C - Activated sludge degassing process and device

Info

Publication number: CN1093427C
Application number: CN94195194A
Authority: CN
Inventors: 安德泽杰·古尔茨
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-11-09
Filing date: 1994-11-09
Publication date: 2002-10-30
Anticipated expiration: 2014-11-09
Also published as: CN1167447A

Abstract

The present invention discloses a wastewater purification method, particularly a continuous wastewater purification method and a wastewater purification system which is a system used for continuous wastewater purification. The wastewater purification is formed by that a mixture of wastewater and aerated active sludge is degassed before the mixture is discharged into a second settling tank. The wastewater purification system is provided with an air exhausting device (1), an aeration container or a separated chamber (7) is connected to a second settling tank (10) or a separated chamber (8) by the device, and the air exhausting device is designed into a U-shaped tube. A first branch tube forms a charging collecting tube (2), a second branch tube forms a discharging collecting tube (3), and thus, a part which is internally connected with the two top ends is surely provided with separated intermediate chambers (4) of a gas suction chamber (5).

Description

Activated sludge degassing process and equipment

The present invention relates to the purifying method of waste water, successive purifying method especially, and relate to the system and device of device, the especially operate continuously of waste water purification system.

In the purification method for effluent of known use active sludge, the mixture of active sludge is to remain in the waste water of processing and through aeration with suspended state, described mixture leaves aerator tank and directly flows to second subsider later on, and sedimentation is to carry out continuously by the precipitation of mud in subsider.Settled mud is used for the purification process process again, and the liquid of decant flows in the storage as the waste water that purified.The active sludge that is circulated in the purification process process keeps it to detergent powers continuous or some new original waste water in batches.

This purifying method is particularly carried out in the aerator tank that the deep trouth with for example dark 5m of mistake constitutes, and has significant disadvantages in actual applications.This is because active sludge is a feature with its lower sedimentation capacity and/or come-up to the unfavorable performance of mud throw out on surface, this makes precipitation step very difficult, and under the situation of or multi-stage process very dark, make it in second subsider, can not carry out sedimentation at groove.

In order to eliminate this phenomenon, knownly in method of wastewater treatment, before the waste water that aeration is crossed flows into subsider, adopt flocculation blended additional operations, but this makes purifying treatment method long, and often be to carry out in abnormal mode.

The throw out that the present invention is based on active sludge in known purification of waste water treatment process process has the fact of undesirable performance, and this performance causes the limiting effect and the ability of described method.

According to this fact, operation that the present invention is used and technique means are to make the throw out that reclaims mud can have new performance, and this mud can play active sludge in circulation technology, and described performance is improved the effect of wastewater treatment and ability.

A kind of purification method for effluent, successive purification method for effluent particularly, its main points are to make earlier waste water to mix with active sludge and make resulting mixture carry out aeration in groove, the mixture that later aeration is crossed flows in second subsider, and the recovery mud that will collect in second groove is back in the technological process of aerating waste water again, is to be that the waste water that aeration is crossed and the mixture of active sludge outgased before described mixture is entered second subsider by the feature of purification method for effluent of the present invention.

The described degassing is preferably finished by the intake-gas particle.

The described degassing is preferably finished by producing negative pressure.

Before the degassing, preferably the other air capacity of feeding makes it to be turbulent flow and oriented flow is dynamic in the mixture of crossing toward aeration.

The device of waste water purification system, especially the system and device of operate continuously, comprise and be used for waste water and active sludge mixture aeration groove arbitrarily, particularly multistage groove, groove is connected to second subsider with unidirectional connection and circulation, and purification of the present invention has gas barrier, and it is to be made up and form with the chamber that second subsider or its separate by aerator tank or its chamber that separates.

The negative pressure degasification device be shaped as an inverted U-shaped pipe, one branch constitutes reinforced collection tube, and another branch is the discharge collection tube, the part that connects its two upper end in addition is the aspirating chamber that limits intermediate chamber and separated therein.

The bottom of reinforced collection tube and discharge collection tube is to be immersed in or to be connected with the active sludge mixture aerator tank and second subsider respectively, or is connected with the chamber that described subsider separates with the chamber that separates of described groove.

Be positioned on the waste water liquid level of wanting aeration on the reinforced collection tube opening is housed, described waste water is to be full of to handle the groove that waste water is used, perhaps the top of the chamber that separates in described groove.Preferably bleed-pressure pump put into reinforced collection tube or bleed-pressure pump puts into the discharge collection tube.

The indoor mixture liquid level that aerator tank or the indoor mixture liquid level that separates therein will be higher than second subsider or separate therein.The gas aspirating chamber is connected with vacuum source, preferably is connected with off-gas pump.

The throw out that the present invention is based on active sludge in the known waste water treatment process process has can cause that described technology can not obtain the fact of satisfactory result's undesirable performance.

The present invention describes in detail with the embodiment of its description of drawings, and wherein Fig. 1 represents the local figure of signal of effluent purifying device, and Fig. 2 represents to be used to have the equipment of the purification of waste water system of multistage groove.

As shown in Figure 1, negative pressure degasification device (1) mainly is the inverted U-shaped pipe, an one arm is reinforced collection tube (2), and second arm is discharge collection tube (3), and the aspirating chamber (5) that the part that connects its two upper end has defined intermediate chamber (4) and wherein separated, this de-gassing vessel exists with intermediate chamber (4) form that wherein has the aspirating chamber (5) that separates.The bottom of reinforced collection tube (2) and discharge collection tube (3) is immersed in or is connected with second subsider with active sludge mixture aerator tank respectively, perhaps the chamber (7) that separates with container be connected with chamber (8) that second subsider separates, described intermediate chamber on its length direction at least with two collection tubes (2,3) upper end is connected, and its sectional area is greater than connecting aerator tank or its chamber that is divided into (7) sectional area with the collection tube of second subsider (10) or its chamber that is divided into (8), in addition, this waste water purification device also has the device that the waste water of supplying with intermediate chamber (4) and active sludge mixture turbulization are moved.

Reinforced collection tube 2 has opening 6 above the liquid level of the waste water of wanting aeration " a " that is full of wastewater trough, or its chamber 7 of separating therein.

Gas aspirating chamber 5 and vacuum source, for example unillustrated vacuum pump connects in the accompanying drawing.

Fig. 2 shows negative pressure degasification device 1, and it is located between the chamber 9 and second subsider 10 of last the top in the multilevel system that aerating activated sludge is used in the waste water to be processed.

In the negative pressure degasification device of describing 1, force waste water and the previous mixture of aeration of active sludge to move and turbulent flows by the other air capacity of opening 6 suctions that is positioned at the liquid levels top that is full of aerator tank chamber 7.The effect of adopting huge pump in this case is in order to reach above-mentioned current.The other air capacity of being introduced that causes desired mixture proportion reduction is that the gas in being contained in described mixture aspirates.

Embodiment

To have per hour 30kg O ₂Pollution load and with 100m ³The amount of/h is introduced the waste water of typical municipal wastewater purification system and can effectively and fully be handled, and described system comprises the container of the mixture that is used for waste water and active sludge composition.Because exhaust equipment of the present invention has been installed, the sedimentation capacity of active sludge obviously increases, and the sinkability in the treatment system is increased, and has finally reached the effective detergent power of waste water and has increased at least more than 50% and need not use additional aerator tank.

So can obtain this effect is because because negative pressure degasification device of the present invention, under condition of negative pressure, make by waste water and active sludge and form the mixture of previous aeration after exhaust, make around the active sludge throw out of the micro-bubble that is enclosed in gas wherein, do not contain under the above-mentioned condition of negative pressure and can be expanded to the gas of several times with upper volume, the result is that micro-bubble separates with throw out, and the structure of its throw out is almost completely decomposed.After, when further flowing through exhaust equipment, progressively reduce in each step under the condition of negative pressure value single mud throw out promptly recombine after described bleeding, have much higher proportion so together, the result improves its sedimentation capacity significantly.

Thereby might advantageously be implemented in the purification process that contains a large amount of fibrous microorganisms in the mud and do not relate to the sludge settling ability basically by the present invention, it is inaccessiable that this purification process uses currently known methods.

Be suspended in the active sludge throw out in the mixture that is full of second subsider, after the degassing, because the process in the throw out can produce and a kind ofly not form micro-bubble in the sedimentation throw out but be dissolved in gas in the mixture that before removed gas.

Now definite, be collected in second subsider, through the active sludge of negative pressure degasification, deliver to aeration system once more as reclaiming mud, it is characterized in that, improved the absorptive capacity that will handle pollutants in waste water to being contained in, this quickens it basically and handles, comprising the pollutent in conjunction with phosphorus.

Find that in addition described mud has higher resistance to the unexpected overload of pollutent.

Claims

1. purification method for effluent, it comprises that waste water and active sludge mix and make the mixture aeration of gained in groove, and the mixture that aeration is crossed subsequently enters in second subsider, also comprise and be used for the technology of aerating waste water once more being collected in recovery mud in second groove, it is characterized in that, waste water with the mixture of aeration of active sludge before entering second subsider, carry out negative pressure degasification, before described negative pressure degasification, make this mixture be turbulence state by in this mixture, introducing other air capacity.

2. by the purification method for effluent of claim 1, wherein this purification of waste water is carried out continuously.

3. waste water purification system device, comprising waste water and the employed any groove of active sludge mixture aeration, this groove is connected to second subsider by the unidirectional circulation of inverted U-shaped conduit, an arm in U-shaped conduit road constitutes reinforced collection tube, and its another arm constitutes the discharge collection tube, it is characterized in that, this waste water purification system device has negative pressure degasification device (1), described de-gassing vessel exists with intermediate chamber (4) form that wherein has the aspirating chamber (5) that separates, intermediate chamber on its length direction at least with two collection tubes (2,3) upper end is connected, and its sectional area is greater than connecting aerator tank or its chamber that is divided into (7) sectional area with the collection tube of second subsider (10) or its chamber that is divided into (8), in addition, this waste water purification device also has the device that the waste water of supplying with intermediate chamber (4) and active sludge mixture turbulization are moved.

4. by the device of claim 3, any aerator tank that it is characterized in that described waste water and active sludge mixture is multistage groove.

5. by the device of claim 3, it is characterized in that described gas aspirating chamber (5) is connected with vacuum source.

6. press the device of claim 3, the bottom that it is characterized in that described reinforced collection tube (2) and discharge collection tube (3), be immersed in or be connected respectively to the active sludge mixture aerator tank and second subsider, perhaps be connected respectively to the chamber (8) that chamber (7) that described groove separates and described second subsider separate.

7. press the device of claim 3 or 6, it is characterized in that causing that the device that turbulent flow moves is the opening (6) in the reinforced collection tube (2), described opening is positioned at liquid level (a) top of the waste water of wanting aeration, perhaps is positioned at wherein to be full of in the spaced chamber of aerating waste water (7).

8. by the device of claim 3 or 6, it is characterized in that vacuum-pressure pump is put into reinforced collection tube (2).

9. by the device of claim 3 or 6, it is characterized in that vacuum-pressure pump is put into discharge collection tube (3).