DE4112377C2 - Compact reactor for aerobic biological wastewater treatment - Google Patents

Description

The invention relates to a compact reactor for the aerobic biological cleaning and clarification of communal and industrial wastewater, preferably using the classic activated sludge process.

For aerobic biological wastewater treatment using the classic activated sludge process, the following three essential procedural measures must be implemented using the technical equipment:

• - the aerobic biodegradation of waste water substances in an aeration tank - the ak tive reaction space - with sufficient acid material supply and mixing to avoid formation of bio-sludge deposits;
• - the separation of organic sludge from the bio logically treated wastewater in a secondary clarifier basin with or without mechanical bottom sludge and floating sludge removal and
• - The return of most of the abge different organic sludge in the aeration basin.

But also the problems of foam combat in the aeration pool and the swimming mastered sludge removal in the secondary clarifier become.

This is currently mostly in spatial terms separate pools with wastewater flow in the open Slope and bio sludge return with the help of Centrifugal pumps carried out. However, they are also tech African solutions known, in which the above. wesentli Chen process steps more advantageous in a compact th system.

So the clarifier z. B. after DE 31 06 465 centrally in the ventilation be arranged basin.

The return of the separated organic sludge into the aeration basin either as is known with centrifugal pumps or automatically because of you difference between degassing and sedimentation biosludge and the aerated wastewater in the Aeration basin.

Due to the wastewater flow in the free slope through the aeration and clarification basin in the known compact systems of the base areas generally requires as the sum of the base area the basin. It is in addition to the equipment for the Realization of the required oxygen input and the mixing in the aeration basin - e.g. B. Aeration gyros, compressors, air distributors, circulation pumps, nozzle systems - pump templates and circles Sele pumps for bio sludge return to install to operate and maintain. In the pump template conditions for the separated organic sludge occur Loss of activity of the bio due to the interim storage period sludge, which degrades the overall plant adversely affect ge.

With the automatic biosludge return in Compact systems due to the difference in density it is problematic to get the desired bio sludge back adjust the flow rates and keep them constant since the small density difference only an extremely small one Pressure difference as the driving force for the self-acting bio backflow of sludge and this density difference is subject to various influences, e.g. B. through the ventilation intensity and the bio sludge quality formality.

If there is strong foaming in the aeration basin or unreasonable odor nuisance or necessary separate exhaust air treatment must sometimes the aeration basin is completely covered become.

Swimming mud occurring in the clarifier must in all known systems according to the mechani pumped away with special equipment and undergo separate treatment.

These well-known compact systems for aerobic biological wastewater treatment therefore require Part of a relatively large footprint and depending on the Specificity of the wastewater to be treated is a complex one cover of the ventilation basin as well as separate Equipment for foam control, the bio sludge return and floating sludge removal associated with corresponding investment and war effort and additional electrical energy requirements.

Solutions are still known where the secondary clarifier is immediately is arranged above the aeration basin. adversely is also with these solutions that either the waste water water from the aeration tank into the secondary clarifier or the wastewater and the separated organic sludge in the aeration basin with separate pumps must be promoted and separate equipment for foam control and swimming sludge side are required.

The invention has for its object a Compact reactor for aerobic biological wastewater cleaning to develop the technical-technologi tasks - sufficient fumigation, avoidance formation of bio-sludge deposits in the reaction space, effective biomass separation and controlled re management of sedimentation as well as on floating organic sludge from the secondary clarification stage oh ne significant loss of activity - with minimal Maintenance effort as well as simple and safe control possible foams smallest possible footprint and with minimal energy need solves.

According to the invention, the object is achieved by that the biologically active reaction space with a Clarification room, which is centered over the biologically active ven reaction space is arranged, functional with egg nem vertical circulation gas system is connected. The circulating gassing system essentially exists from a central vertical upstream pipe with a Propeller pump, with a known Bodenna hen umbrella-like inlet part and with a height-adjustable deflection hood with Gas inlet channels at the top and an Ab flow pipe that around the central upflow pipe and the Deflection hood is arranged and extending from the highest Position the deflection hood close to the inlet part of the upstream pipe extends.

The known overflow edge of the secondary clarifier room is below the lowest level Position of the deflection hood arranged. Between the Upflow pipe after the propeller pump and on known distributor of the secondary clarification room is one Drain pipe with a level control valve available the. The known organic sludge return line from the secondary clarification room and the wastewater inlet pipe  to the active reaction space are at that Down pipe connected. more are in the downpipe a little above the level the overflow edge of the clarifier overflow opening provided. The known exhaust pipe of the active Re covered by the clarification room Action space is over the overflow edge of the night clarification room led upwards and has a back Duct with a slope to the upper part of the outflow pipe of the circulating gassing system.

Through this inventive design of a The compact reactor is activated when the propeller pump is in operation to supply it with oxygen in the active reaction space wastewater constantly in circulation up to the fill stood raised in the clarification room, falls - through the environment Steering hood enforced - as several segment-like Open jets approximately vertically in the ring cross-section between upstream and downstream pipes and sucks the gap between the deflection hood and the outlet pipe and air via separate gas inlet tunnels, the ge together with the wastewater circulated up to via the inlet part of the upflow pipe at the bottom of the active reaction space is entered. The one with Hil The amount of wastewater circulated by the propeller pump and the buoyancy of the up to near the ground air ensures the necessary mixing Avoiding bio sludge deposits and one energetically effective oxygenation caused by the telescopic height-adjustable deflection hood in its Intensity continuously adapted to the requirements that can. The Ab fed to the compact reactor water and that from the clarification room into the active Bioslud flowing back into the reaction chamber in the area of the highest oxygen supply and are immediately reduced to the large Ab amount of water distributed. With the help of the level regulator maturity in the feed line between the upstream pipe after the propeller pump and the distributor in the night The same volume of liquid that the flows into the active reaction space, constantly as a partial flow from the circulation quantity of the circulating gassing system removed in a controlled manner and fed to the secondary clarification room. Through the overflow openings in the discharge pipe of the Um running gassing system a little above the level the overflow edge of the clarifier can possibly occurring mud with a be Known clearing device in the drain pipe ge be directed so that the swimming mud immediately like which is fed to the active reaction space and activated becomes.

With strong foaming in the active reaction space can foam over the exhaust pipe and the back Run line up to the outflow pipe of the circulation bega system, partly or completely destroyed or completely in the downpipe gets destroyed.

Furthermore, according to the invention, in the exhaust pipe of the active reaction space above the overflow edge of the clarifier a liquid separator be arranged, the liquid outlet preferably se is connected to the return line. This is possible because by raising the deflection hood of the fumigation system despite the emerging Overpressure in the exhaust space of the active reaction area mes the fumigation intensity can be maintained.

According to the invention in the exhaust pipe of the acti ven implementation space also arranged an exhaust gas biofilter be nice. It is preferably above the overflow edge  to arrange the clarification room, so that also in the separating liquid or possibly emerging foam via the return line to the Ab current pipe of the fumigation system can drain.

In the return line for the sedimented bio mud from the clarification room into the active reak tion space can be inventively due to the Ni level difference in post-clarification and active reaction space advantageously a quantity measurement or quantity re of the returned amount of organic sludge men.

In case of failure or out of service me of the circulation pump for the fumigation system According to the invention in the drain line between Akti vem a reaction room and clarification room a back Flap installed and for the active reaction room provided an emergency drain line, so that the Clarification chamber cannot run empty in an uncontrolled manner and with constant wastewater inflow, a jam or overflow is prevented.

The combination of Bega solution device for the active reaction space with centered on the active reaction space arranged secondary clarification room is thus a compact reactor for aerobic biological wastewater treatment which has been a surprising qualitatively new one complex and very advantageous solution for ventilation treatment, biosludge separation and recycling, the Mastery of swimming mud and foam as well as for represents the exhaust gas treatment. The base area is minimized. For the return of sedimen organic sludge, the elimination of floating Mud and foam control will not work ne special mechanical equipment needed. The energy and maintenance costs are therefore low ger than in the known compact reactors.

The invention is explained below using an exemplary embodiment. Fig. 1 shows the cross section through a rotationally symmetrical compact reactor. Fig. 2 shows the associated top view.

In the active reaction chamber 1 , the Bega solution system, consisting of the upflow pipe 3 with the inlet part 4 , the propeller pump 5 and the order hood 6 with gas inlet channels 7 and the flow pipe 8 , is used. Above the active reaction room 1 , the secondary clarification room 2 is arranged around the upper part of the gassing system. Depending on the specific requirements, the diameter of the waste water to be purified means that it is preferably the same or larger than the active reaction space 1 .

The overflow edge 9 in the secondary clarification room 2 for the cleaned and clarified wastewater is arranged below the height of the deflection hood 6 of the gassing system. For the wastewater drain from the active reaction chamber 1 to the distributor 14 of the secondary clarification chamber 2 , a drain line 11 is provided, which leads from the upstream pipe 3 above the propeller pump 5 to the distributor 14 in the secondary clarification chamber 2 and in which a level control arm 12 actuated directly by a float a check valve 13 are arranged. This makes it possible for the active reaction space 1 supplied wastewater and bio-sludge to be returned in a level-controlled manner as a partial flow of the circulating quantity of the gassing device into the clarification chamber 2 . For the supply of waste water to the active reaction chamber 1 , the waste water supply line 16 is provided.

For the return of the biosludge sedimented in the secondary clarification room 2 into the active reaction room 1 , a biosludge return line 17 is present from the lowest point of the biosludge collection room. A quantity control 18 is advantageously installed in this biosludge return line 17 due to the difference in the level between the clarification chamber 2 and the discharge pipe 8 . At the biosludge return line 17 , the excess sludge line 19 is closed. The wastewater inlet line 16 and the bio sludge return line 17 are connected to the upper part of the outlet pipe 8 of the fumigation system, so that the wastewater and the recycled biosludge are immediately mixed intensively with the circulation flow of the Begasungssy stems and reach the zone of the highest oxygen supply.

The drain pipe 8 has above the overflow edge 9 of the secondary clarification chamber 2 several overflow openings 10th The secondary clarifier 2 is equipped with a Abräumervor device 15 for the sedimented bio-sludge and for swimming sludge, the swimming sludge also being cleared inward like the soil sludge, so that it is cleared through the overflow openings 10 into the drain pipe 3 of the gassing system and detected there by the circulation flow becomes.

In the clarification room 2 accumulating and cleared floating sludge is thus easily returned to the active reaction room 1 without significant energetic and technical effort and does not have to be eliminated separately.

At the highest point of the active reaction chamber 1 , an exhaust gas line 22 is connected, which extends over the overflow edge 9 of the secondary clarification chamber 2 and is provided with a return line 23 with a slope to the upper end of the outflow pipe 8 .

Thus, excess foam occurring in the active reaction chamber 1 can flow off via the exhaust line 22 and the return line 23 into the outflow pipe 8 , it being able to completely or partly self-destruct or degas and the rest being sucked in and cleaned by the large circulation flow of the gassing device becomes. In the exhaust line 22 but also a liquid separator 24 in known Ausfüh implementations such. B. cyclone, impact or lamella separator or a special mechanical foam destroyer and / or an exhaust gas biofilter can be installed, the liquid outlet of which is preferably connected to the return line 23 .

The active reaction chamber 1 is further provided with an emergency drain line 21 , which integrates drain line 20 into the waste water drain. This emergency drain line 21 and the check valve 13 in the drain line 11 ensure that there is no backwater in the active reaction chamber 1 supplied waste water flow when the decommissioning or failure of the propeller pump 5 and the secondary clarification chamber is not partially empty.

List of reference numbers

1

reaction chamber

2

Nachklärraum

3

Aufstromrohr

4

inlet part

5

propeller pump

6

deflection hood

7

Gas inlet channel

8th

Abstromrohr

9

Overflow edge

10

Overflow opening

11

drain line

12

Level control valve

13

check valve

14

distributor

15

Abräumervorrichtung

16

Waste water supply line

17

Bioschlammrückführleitung

18

Quantity measurement / regulation

19

Excess sludge line

20

Waste water drain pipe

21

Notablaufleitung

22

exhaust pipe

23

Return line

24

Liquid / Abgasbiofilter

Claims (7)

1.Compact reactor for aerobic biological wastewater treatment consisting of a biologically active reaction space with a device for gassing the wastewater and a secondary clarification room arranged above it for biomass separation with or without known devices for floating sludge and soil sludge removal, characterized in that the biologically active reaction space ( 1 ) with the secondary clarifier ( 2 ) with the help of a vertical circulating gas system, consisting of a central upflow pipe ( 3 ) with a propeller pump ( 5 ) with an umbrella-like inlet part ( 4 ) known per se near the ground and with a height-adjustable deflection hood ( 6 ) with gas inlet channels ( 7 ) at the upper end and an outflow pipe ( 8 ) which is arranged around the central upflow pipe ( 3 ) and the deflection hood ( 6 ) and extends from the highest position of the deflection hood ( 6 ) to the vicinity of the inlet part ( 4 ), is functionally connected, the Überlau fkante ( 9 ) of the secondary clarification chamber ( 2 ) is below the level of the deflection hood ( 6 ), a drain line ( 11 ) with a level control valve ( 12 ) between the upstream pipe ( 3 ) after the propeller pump ( 5 ) and the distributor ( 14 ) of the secondary clarification chamber ( 2 ) is present, the biosludge return line ( 17 ) from the secondary clarification chamber ( 2 ) and the waste water feed line ( 16 ) to the active reaction chamber ( 1 ) are connected to the discharge pipe ( 8 ), in the discharge pipe ( 8 ) directly above the level of the overflow edge ( 9 ) of the secondary clarification chamber ( 2 ) overflow openings ( 10 ) are provided and the exhaust pipe ( 22 ) from the active reaction chamber ( 1 ) is led over the overflow edge ( 9 ) of the secondary clarification chamber ( 2 ) and this a return line ( 23 ) with a gradient to has the upper part of the discharge pipe ( 8 ). 2. Compact reactor according to claim 1, characterized in that a liquid separator ( 24 ) is arranged in the exhaust line ( 22 ) of the active reaction chamber ( 1 ) above the overflow edge ( 9 ) of the secondary clarification chamber ( 2 ), the liquid outlet preferably to the return line ( 23 ) connected. 3. Compact reactor according to claim 1 and 2, characterized in that an exhaust gas biofilter ( 24 ) is arranged in the exhaust line ( 22 ) of the active reaction chamber ( 1 ) preferably above the overflow edge ( 9 ) of the secondary clarification chamber ( 2 ). 4. Compact reactor according to claim 1 to 3, characterized in that a quantity measurement and / or quantity control ( 18 ) is provided in the biosludge return line ( 17 ). 5. Compact reactor according to claim 1 to 4, characterized in that for the active reaction chamber ( 1 ) an emergency drain line ( 21 ) and in the drain line ( 11 ) between the active reaction chamber ( 1 ) and secondary clarification chamber ( 2 ) a check valve ( 13 ) are provided , 6. Compact reactor according to claim 1, characterized in that the deflection hood ( 6 ) is telescopically height-adjustable. 7. Compact reactor according to claim 1, characterized in that the biosludge return line ( 17 ) and the waste water supply line ( 16 ) are connected to the upper part of the outflow pipe ( 8 ).