HU217375B - Pipeline in loop and combined structure for increasing of energy of sewage-water and for tracing and refreshing of sewage-water staying in aerob condition and partly or totally treating of sewage-water - Google Patents

Abstract

The facility itself has closed socket conductors (2a, 2b; 3) with spacers (h), each containing at least one pump shaft (1a ... 1h) in which at least one, preferably two, pumps and sockets are pump mines (1a ... 1h). Pump mines (1a ... 1h) are equipped with means or devices for aeration of the effluent entering the plants or / and for the anxiety of the wastewater. The wastewater is mixed with raw sewage sludge, or anxiolytic, which enters the barrier system of the barrel system. The characteristic feature of the process is that the heat in the pump mines (1a ... 1h) increases the effluent content of the wastewater by aerating and mixing it, and producing an activated sludge, or making the wastewater anxicous by an air intake mixing operation. Sawmills (h) to quarrying nasal conduits (2a, 2b; 3) are pumped out of pumped mines (1a ... 1h) with so much increased xenogeneic and hydrophobic water or anxiolytic wastewater by pumping to the wastewater arriving at the deer, which can be appropriately stabilized in the cords (2a, 2b; 3). a mixture of virgin wastewater and wastewater pretreated in pump mines (1a ... 1h) is kept in a stagnant flow of virtually constant floating depth and flow rate. In this way, by using a pipe nozzle line (2a, 2b; 3), the flow of waste water into the feeder steam and / or the purification plant (6) or / and the outlet junction (5) directed to the phase separating steam (5) is cleaned in the system itself. ŕ

Description

The installation itself has closed channel duct (2a, 2b; 3) loops (h), each of which comprises at least one pump shaft (la ... lh) having at least one, preferably two pumps, and the loops are pump shafts (la ... .lh). The pump shafts (la ... lh) are provided with means or devices for aeration or / and for rendering the waste water anoxic.

In the process, raw sewage entering the sewer system ducts is mixed with sewage containing activated sludge or anoxic. The process is characterized in that in the pump shafts (la ... lh) the waste water is aerated and mixed to increase its oxygen content and to produce activated sludge or to render the waste water anoxic by a mixing operation without air supply. The sewers (2a, 2b; 3) forming the loops (h) are pumped from the pump shafts (la ... lh) to the incoming raw sewage 2 by pumping to the incoming wastewater 2a, with increased oxygen and activated sludge or anoxic effluent 3) Suitably Constant or Substantially Constant Flotation The scope of the description maintains a mixture of raw sewage and pre-treated sewage in pump shafts (la ... lh) at a constant forced flow at a depth of 10 pages (including 3 sheets). In this way, the waste water flowing to the receiving or / and post-purge outlet (5) to the receiving or / and post-purification plant (5) is used to purify the sewage system itself by using the conduits (2a, 2b; 3) as tubular bioreactors.

HU 217 375 B

HU 217 375 Β

The present invention relates to a wastewater treatment plant and to a process for treating wastewater in the plant.

The development of settlements, both residential and industrial, is bound to be accompanied by solutions for the collection, drainage, purification of municipal and industrial wastewater and rainwater, and the safe disposal of purified water and sludge. Sewerage networks are used for collecting and discharging wastewater, which may be gravity or forced flow, including pressurized or vacuum systems, but also combinations of these are known. State-of-the-art sewer systems are known, for example, from U.S. Patent Nos. 182,345 and 196,636, which use newly designed plastic cleaning molds instead of conventional concrete cleaning pits.

The wastewater collected in sewerage systems is, according to currently known solutions, sent to wastewater treatment plants, which can generally be made at considerable expense, where the treatment is carried out by mechanical, physico-chemical and biological methods or by a combination of these. There are many different processes and treatment plants for wastewater treatment. The latter may be open or closed in design, subterranean or subterranean, horizontal or vertical flow, while technologically differentiated in aerobic, anoxic and anaerobic. For example, U.S. Patent No. 194784 discloses a process which is a combination of aerobic and anaerobic processes.

Currently known sewer systems are designed only to solve the task of collecting and draining wastewater, the wastewater being transported to treatment plants with varying saturation of sewer lines and variable wastewater velocities, often over several days of runoff, while the wastewater may become anaerobic and develop odor. Anaerobic wastewater can produce compounds, such as hydrogen sulfide, sulfuric acid, or sulfuric acid, which will corrode, damage, and eventually destroy, sewers, manholes, sewage treatment structures, and their mechanical fittings and equipment. The collection and discharge of wastewater is therefore currently separate from the purification operation.

Hungarian Patent No. 196,316 relates to a process for removing air, dehumidification and deodorization from odors in ducts, but does not address the problem of fluid transportation, cleaning and corrosion in sewer systems.

It is known that in gravity sewers, technical regulations limit sewage boundary velocity, channel drainage and sewer pipe diameter to ensure sediment-free operation of the sewer system. The slope is 2-3% and the minimum diameter of the public sewer line is 20 cm.

Thus, as stated above, existing sewer systems have provided and provide only the wastewater transport function at extreme load values, utilizing cleaning technology, such as refurbishing or at least partial cleaning, resulting from the storage capacity of the sewers, as disclosed in OTH 1549/89. disclose your solution for cleaning your sewer system. According to this proposal, combined sewage lifting structures with external or internal recirculation ducts should be installed in the sewer system instead of the conventional conventional lifting stations, which contain a separated aeration space and a settling area, the latter of which is recirculated with a recirculated pumping sludge. This solution is disadvantageous in many respects, such as the cost of combined ductwork, recirculation sludge ducting, the effectiveness of cleaning, and the removal of trash and excess sludge from the combined dredgers in the city.

It is an object of the present invention to provide a process and facility for the simultaneous collection and disposal of wastewater which, with minimal investment effort and with minimal artwork, results in efficient cleaning of the sewerage system.

The invention is based on the discovery that, starting from the solution disclosed in the above-mentioned published Hungarian patent application, the implementation of activated sludge cleaning technology in the sewerage system does not require the construction of two-chamber settling-aeration structures but aeration and mixing in to maintain a constant forced flow rate of aerated wastewater at a specified depth of float to achieve the required degree of purification, thereby minimizing the investment of wastewater treatment, while utilizing the sewerage system while at the same time sparing it from the adverse effects of corrosion.

Based on this discovery, the object of the present invention has been solved by the use of a facility characterized by:

- itself having closed ducting loops, each of which comprises at least one pump shaft in which at least one, preferably two, pumps are provided, and the loops are connected to each other by pump shafts;

- the pump shafts are provided with means or devices for aeration or / and anoxication of the waste water entering them.

In a preferred embodiment, deep-air aerators are also suitable for mixing wastewater during air supply, and devices for rendering the wastewater anoxic are mechanical mixers. Preferably, the pump shafts are provided with a grid separator or / and grid shredder.

HU 217 375 Β

The process according to the invention, which can be carried out in the above installation, mixes the raw sewage entering the sewer system sewer with sewage containing activated sludge or made anoxic and the essence of the process is that

- venting and agitating the wastewater in the pump shafts to increase its oxygen content and to produce activated sludge or to render the wastewater anoxic by a mixing operation without air supply;

- the sewage pipes forming the loops are pumped to pumped to the incoming wastewater, which has a constant or substantially constant flow rate in the sewage sludge and is pumped to the incoming wastewater mixture thereof; In this way, the waste water flowing towards the outlet to the receiving or / and after-treatment plant or / and phase separator is used as a pipe bioreactor to purify the sewage system itself. According to a preferred embodiment of the method, a portion of wastewater with increased oxygen content and activated sludge or anoxic wastewater containing pumped sumps is pumped into and out of the main flow pointing downstream of the sewer to the outlet it being desirable to maintain a constant or substantially constant floating depth and / or flow velocity in the loops for that channel line; and the resulting excess amount is pumped into the duct line in front of the pump shaft. It may also be expedient to keep the treated sewage in the loops of the facility in a continuous flow, even in the absence of raw sewage, for example at night, by operating the pump shaft pumps, and if some loops contain only oxygen and activated sludge, only anoxic wastewater is pumped from the pump shafts, and finally, the wastewater in the pump shafts is continuously aerated or mechanically agitated to make it anoxic.

Thus, the process of the plant of the present invention continuously flows a mixture of raw sewage and sludge treated in pump wells in all sewer lines of the sewer system, at constant speed and constant floating depth, operating the pumps at all times, even at night. be held. Thus, only purified or partially purified wastewater is discharged from the system as much as the incoming raw wastewater, which is immediately and continuously mixed with oxygen and activated sludge enriched wastewater and effectively purified.

The invention will now be described in more detail with reference to the accompanying drawings, which show a preferred embodiment of the installation. 1 is a schematic top view of a preferred embodiment of an installation for a gravity drainage system for carrying out the process of the present invention; FIG.

Figure 2 is a top plan view of a component of the facility of Figure 1;

Figure 3 is a larger vertical section through the ducts and shafts of the component of Figure 2;

Figure 4 is a vertical sectional view of one of the shafts of Figure 3.

The installation shown in FIG. 1 is essentially a loop-flow sewer system formed by the main manifold ducts 2a, 2b, the pump shafts la-lh and the connecting ducts 3, the latter of which are located in the auxiliary manifolds 4 through purification shafts (not shown in FIG. 1). connected. The main sewer 2 'also carries wastewater, which, as described in more detail below, is discharged and discharged through the outlet duct 5, which is connected to the after-treatment plant 6 or the phase separator, but the purification may also be such that directly to the host. The installation is considered to be a loop-flow sewer system because at least three sections of at least three sewer lines connecting at least three pump shafts 1 to ... 1h are interconnected in a loop-like configuration, i.e., said installation elements are interconnected in a loop-flow manner.

Figures 2 and 3 show in larger scale the loop loop formed by the two connecting conduits 3 and the pump shafts la, lb and le at the top left of Fig. 1, therefore Figs. the installation elements already described with reference to Figure 1 are denoted by the reference numbers already used for the latter. As can be seen in Figures 2 and 3, the bypass manifolds 4 always end up in a cleaning shaft 7 or, for example, a plastic cleaning shaft, and in this embodiment, the pumping shaft cleaning pumps are not necessarily separated by 10 partitions. They contain 12 biological reactor compartments and 13 collecting compartments, the volume of the latter being substantially smaller than the volume of the former. At the bottom of the biological reactor space 12 is a backflow pump 9, and the collecting space 13 also includes a pump 8 located near its bottom, which is used for conveying wastewater, sludge and litter. In the lower third of the partition 10, a large opening 14 (Fig. 3) is formed.

The pump shaft 1b shown in Figures 2 and 3 is shown in larger scale in Figure 4 (otherwise, the system - installation -

EN 217 375 Β how many lah lh pump shafts can have the same design).

Figure 4 also shows the deep air aeration 15 and the mechanical agitator 16 located in the biological reactor space 12 near the bottom with an air supply tube 15. Prior to the suction opening of the pump 9, a grille shredder 17 may be mounted if necessary. Otherwise, the grid separator 11 is provided for separating the litter. The pump discharge pipe 8 is designated by reference numeral 8a and the pump discharge pipe 9 by reference numeral 9a. A mesh retaining plate 14a is incorporated in the orifice 14.

1-4. The operation of the installation shown in Figures 1 to 5 is as follows (arrows indicating the flow of the fluid on the lines):

raw sewage from untreated sewage from the sewage emitters to the plant according to the invention through the main collecting channels 2, 2 'and the secondary collecting channels 4, where it is mixed with the microorganism forming the activated sludge in the loop stream. This mixed waste water flows into the 12 biological reactor spaces of the la ... lh pump shafts, where

By operating the aeration valve 15 shown in FIG. 4, that is, by introducing fresh air through the air inlet pipe 15a into the sewage mixture through the air inlet pipe 15a, the oxygen is mixed into the liquid and vigorously stirred in the process. continues through an oxygen-rich growing mass of microorganisms.

This aeration-mixing operation is carried out continuously or repeated at intervals and over time depending on the parameters of the raw sewage inlet (yield, degree and nature of the contamination, BOD, etc.), but the wastewater mixture in the plant piping system. In the case of Figures 1 to 4, the conduits 2a, 2b and the interconnecting conduits 3 are maintained in a constant or substantially constant flow rate by the proper operation of the pumps 8 and 9. It is possible that through the pump, from the partially or possibly completely purified oxygen-rich sewage sludge mixture in the la ... lh pump wells, the pump is fed to the following loop system, the outlet - in the system shown in Fig. 1, on the other hand, the pump returns from the 12 reactor compartments the excess purged activated sludge mixture into the "loop" of the respective purification pump shaft, that is to say, the nearest la ... lh pump shaft - this can be a constant amount - between the total amount of wastewater entering through the side collecting channels 4 and the main collecting channels 2, 2 'and the amounts of sewage sludge mixture purified from and fed to the pump wells 1 a ... lh.

In the "loop" of FIG. 1, raw sewage arrives at the vented-mixed pump sump la from the main manifold 2, pre-cleaned-vented sewage is supplied by the pump 9 of the downhole to the interconnection line lb, downstream of the manholes. - from the collecting channels through the cleaning shafts 7; in the lb purification pump sump, the wastewater is again aerated and fed in its cleaned condition to the connection line 3 between the lb and la pump sumps, where fresh raw sewage from the secondary collecting ducts 4 is reintroduced and the sludge sludge pump mixes and this liquid mixture enters the purification pump shaft 1a, where it is mixed with the raw sewage from the main collecting channel 2, and then passes through pipeline section 2a first to the downhole section, and from there to channel section 2b. Through the dotted 2.2 ”lines, a backflow pump 9 feeds a further“ loop ”of the facility to aeration-purified sewage sludge mixture.

It is clear that the a ... lh pumped, aeration-purified liquid pumped from the pump shafts always mixes with the raw waste water flowing through the section and, due to its activated sludge content, ensures its biological purification.

It is readily apparent that the operations and processes described are repeated in all "loops" of the system or facility and, as the flow progresses, there is always cleaner and cleaner sewage in each "loop", and finally the waste water discharged through its 5 discharge channels, but at least partially and substantially purified. The treated effluent from the outlet duct 5 is further treated at the post-treatment plant 6 shown in Figure 1 or subjected to a phase separation operation. Finally, the treated waste water, if necessary after the addition of a disinfectant chemical, is discharged to the receiving live stream or irrigation plant.

Nitrate removal is carried out in certain areas of the facility of the invention; in this range, only the mechanical mixer 16 shown in FIG. 4 is installed in single-loop pump shafts, from where nitrate-depleting, oxygen-deficient, anoxic wastewater is conveyed.

1-4. In the installation of Figures 1 to 4, the wastewater flows gravitationally through the loop flow system (see arrows for fluid flow); overall, in the main direction pointing to the outlet channel 5, indicated by an arrow.

The pumps of the la ... lh purification pump shafts convey the aeration effluent from the deeper inlets to the upstream channels so that, as discussed above, an amount of wastewater subject to biological purification from the biological reactor space 12 is preferably constant. the pump 8 is returned to the particular loop system containing the interconnecting lines 3, while the excess waste water is conveyed by the pump 8 from the collection space 13 to the next loop flow unit. However, it is also possible to implement the method of the invention in pressurized channel systems. 1-4. only the difference from the installation shown in Figs.

EN 217 375 Β that the main manifolds, the interconnectors and the side manifolds are pressurized, closed system, no manhole pipes, and the loop sewage system formed by them is pressurized into the sewage sludge known as the sewage sludge known in the art. with your help. Note that gravity and pressure systems can also be combined.

The operations and processes in the pump shaft shown in Figure 4 are described below:

the partially or fully purified sewage flowing in the loop flow sewer system flows into the collecting space 13 of the purification pump shaft lb according to the arrow from where it flows through the inlet 14a and, if necessary, through the litter separator 11 to the biological aeration and mixer 12

- as previously described, the air supplied in accordance with arrow b is operated by operating the deep aeration 15 to supply oxygen to the sewage sludge mixture while vigorously agitating with this operation, and operating the mechanical agitator 16; this provides the prerequisites for aerobic biological purification in the ducts of the given loop (Figures 2 and 3), i.e. the duct line 2a and the connecting duct line 3, namely the loop system

operating a suitably oxygen-rich state of wastewater and mixing it with activated sludge, or only mechanical agitator 16, which provides the preconditions for anoxic biological purification in the pipeline bioreactor wastewater treatment, . The direction of return to the given "loop" is illustrated in Figure 4 with arrow c, and the transfer of excess to "outflow" loops with arrow d.

Note that the bulkhead 10 of the cleaning pump shaft 1b of FIG. 4 is essentially only required for lattice separator 11, otherwise known per se, and in this connection for the incorporation of lattice 14a, since the material in the reactor space 12 and slurry blend quality is practically the same because the two spaces pass freely through a relatively large filter through-hole 14. The elimination of lattice debris can also be accomplished, in a manner known per se, by the use of a lattice dust shredder 17 located in front of the pump inlet 9.

The pump shafts are equipped, in a manner known per se, with the operation of the pumps 8, 9, that is, with their switches (water level sensors) acting on or off as a result of changes in the level of the sewage in the pump shafts. In the pump shaft 1b of Fig. 4, the pump 8 is actuated and transports the sewage sludge mixture to the forward arrow via the pressure line 8a (see arrow A in the main flow direction, also in Figs. 1-3), when v, the water level reaches the lower edge of the inlet 18.

Meanwhile, the pump 9 is also in operation and feeds a constant amount of treated waste water (arrow c) into the underlying sewer pipeline, which is required to mix with the incoming raw sewage the constant floating depth and flow rate mentioned above. The 9 pumps run continuously for 24 hours without interruption. In the case of Fig. 4, when the wastewater mass drops to a defined minimum level v ₂ , the pump 8 stops. As mentioned above, the pump 9 is still in operation, thus maintaining a continuous flow in the system.

The invention will now be described in more detail by way of examples.

Example I

The settlement has 3400 inhabitants, the expected daily water consumption is 300-400 m ³ / d, and the daily amount of wastewater is 260-350 m ³ / d - in the long run 400 m ³ / d - which has to be drained and cleaned. The specific flow rate can rise to 110-120 dm ³ / person / d.

Daily BOI _S load (T ") 184.9 kg / d

COD 400.0 kg / d

BOD ₅ specific 530.0 g / m ³

Other parameters to consider when designing:

_Lo : 600 g / m ³

L _Asp : 450 g / m ³

P ₈ : 18-20 g / m ³

TN: 65-70 g / m ³

Wastewater treatment is solved by the tubular bioreactor method, i.e. the installation and method of the present invention, utilizing the sewer system itself for wastewater treatment by constructing a sewer system comprising loops containing pump shafts in the settlement. The sumps located at the nodes of the loops are formed as oxygen supply and nutrient transfer units, i.e., activated sludge conveying units, thereby ensuring continuous and uniform mixing and transfer of raw sewage and activated sludge to the formed loop systems.

The system consists of nine loops and five pump shafts. In sewage loops, raw sewage flows gravitationally into each property and enters the continuous-flow activated sludge mixture, thereby mixing with the decomposing microorganisms at the inlet, and through the canal the microfluoric help. Oxygen, which is required for the respiration of the substrate and its decomposing microorganisms, is introduced into the system through the supply of oxygen to the power supply units.

Lattice grains and dead mass of microorganisms (excess sludge) from the system are constantly r. u. it is removed by means of filter fields in the power supplies and by the transfer pumps. Excess sludge and grid removal is done at the phase separation plant at the end of the system. Transmission equipment in power supplies provide 24-hour intensive flow across the entire sewer network (loop ducts)

EN 217 375 Β (low lift pumps), as a result the channel slope can be reduced to 1% o; this allows shallow construction of the canals.

Some of the loop systems are designed as looped anoxic systems, in which, in an oxygen deficient environment, nitrate decomposing organisms use the oxygen of the nitrate to denitrify, removing nitrogen compounds from the system.

Some of the biodegradable phosphorus compounds are accumulated in the activated sludge, while the remaining phosphorus is converted to a settable sludge by addition of a feed solution from the iron dispenser at the phase separator. Much of the phosphorus is removed from the system and therefore the treated effluent discharged to the recipient is below the limit.

The length of the entire sewerage network is 18,132 fin, of which 14,552 fm loop and 14,552 fin; material is KGPVC, size is NA 200.

The slope conditions of the sewerage network are determined by the terrain conditions, in horizontal or opposite terrain the slope of the canal is reduced to about 1% to ensure proper filling and to reduce the laying depth.

The channels have a fill ratio of 1: 0.8-1: 0.75. By creating a constant continuous flow, the velocity is between 0.4 and 1.0 m / s.

The volume of the ducts and pressure pipes of the loop system is 356 m ³ , of which 285 m ^3, calculated with a constant saturation of 75-80%, provide a circular flow.

Example 2

The method of the present invention solves wastewater treatment of a settlement having the following data:

Population of settlement (1998-2000): 3850-4000 people Water consumption: sewage Quantity 400-450 m ³ / d (1998-2000): 385-400 m ³ / d perspective: 550-600 m ³ / d Specific sewage yield Qd: 100 dm ³ / person / d Daily BOI ₅ load (TB): 207.90 kg / d (calculated as 54 g / juice / d) COD: 430 kg / d BOI ₅ Specific (So): 520 g / m ³ (0.52 kg / m ³ ) I-ao 600 g / m ³ I-As · 450 g / m ³ _Po: 18-20 g / m ³ TN: 65-70 g / m ³

The above values have been calculated taking into account the concentration increase due to the decrease in water consumption.

Basic Biological Dimensioning Data (in Tube Bioreactors) Tbmax: 0.2 kg / m ³ / d

If: 0.04kg / kg.d

Th: 0.5 m ³ / m ³ .dt: 33 h

XI: 3.5-5.5 kg / m ³

FI: 0.1 kg / m ³ .d

IK: 25-50d

Weight: 40 kg / d (3-4% w / w content)

Vi: 1.0-1.2 m ³ / d

OC: 375kgO ₂ / d

We build a sewer system with eight loops on which ten pump shafts are installed; these provide the sewerage network with recycled, treated sewage sludge mixture and ensure a continuous, constant floating depth flow in the loop system.

In sewage loops, raw sewage flows gravitationally into each property and enters the continuous-flow activated sludge mixture, thereby mixing with the decomposing microorganisms at the inlet, and further through the channel, the with the help of flora.

The length of the tubular bioreactor sewer network is 17059 fm, material is KGPVC, size NA 200.

On the one hand, the slope conditions of the canal network are determined by the terrain conditions, with slopes of up to 3% o on sloping terrain, with sloping shafts if necessary, and on sloping terrain, the slope of the canal is reduced to 1% o.

The volume of the ducts and pressure pipes of the loop system is 548 m ³ , of which 415 m ^3, calculated on a permanent 50-80% saturation, provide a circular flow. The storage capacity of the power supply units is 135 m ³ (10 power supply units with a usable volume of 13.0 m ³ ). Available volume: 550 m ³ . The daily amount of waste water is in the sewer for 33 hours. The calculated residence time ensures complete oxidation treatment of the wastewater in the sewerage network.

Advantageous effects of the invention may be summarized as follows:

The loop flow ensures that the channels are evenly loaded. All ducts connected to the loop current operate continuously with constant load, no stagnant or overloaded water flows. The loop flow has a balancing effect. Raw sewage in the system with different levels of contamination is compensated by the immediate impact of the flowing bioflora. The loop flow facilitates the uniform loading, utilization and re-formation of activated sludge. Continuous flow prevents deposits in the sewer even with varying external sewage inlets, reducing the need for cleaning, maintenance, and eliminating channel clogs. The use of the loop flow system as a pipe bioreactor eliminates the formation of anaerobic compounds that cause corrosion of concrete and steel and eliminates the odor damaging to the environment resulting from these compounds. The use of pump shafts at loop nodes results in high efficiency waste water treatment. Using the complete pipeline system as a tube bioreactor6

EN 217 375 Β and allows the highest degree of theoretically the shortest duration of wastewater treatment by utilizing the pipe effect. The use of sewer systems as a bioreactor for tubing does not require a slope of 2% o, since a continuous constant flow ensures an adequate flow rate even at a lower slope.

By modifying existing sewer systems in accordance with the present invention, the operation of the sewers can be improved, their maintenance and cleaning needs reduced, and the operating costs of existing wastewater treatment plants reduced, and their cleaning efficiency greatly improved.

The invention is, of course, not limited to the exemplary embodiment of the facility or to the process examples, but may be practiced in various ways within the scope of the claims.

Claims (8)

PATENT CLAIMS 1. An installation for treating, collecting and discharging wastewater in a sewerage system with sewer pipes containing purification shafts and pump shafts, characterized in that: - itself having closed duct lines (2a, 2b; 3) having loops (h) each having at least one pump shaft (1a ... lh) having at least one, preferably two pumps (8, 9), and the loops being pump shafts (la ... lh) communicate with each other; the pump shafts (la ... lh) are provided with means or means for aeration or / and anoxication of the waste water entering them. Device according to Claim 1, characterized in that the aeration means (15), which are also suitable for mixing the waste water during the air supply, and the means for rendering the waste water anoxic, are mechanical mixers (16). Installation according to Claim 1 or 2, characterized in that the pump shafts (1 a ... lh) are provided with a grate separator (11) or / and a grid shredder (17) located in front of the suction opening of the pump (9). 4. A process for treating wastewater according to claims 1-3. An installation according to any one of claims 1 to 4, wherein the process comprises mixing raw sewage entering the sewer system sewer with sewage containing activated sludge or anoxic, characterized in that: - increasing the oxygen content in the pump shafts (la ... lh) by aerating and mixing the wastewater to produce activated sludge or rendering the wastewater anoxic by blending without air; - the sewage pipes (2a, 2b; 3) forming the loops (h) are pumped from the pump shafts (la ... lh) to the incoming raw sewage acid 2, 3) preferably maintaining a constant or substantially constant floating depth and flow rate in a continuous forced stream of a mixture of raw sewage and pre-treated wastewater in the pump shafts (la ... lh) and thereby using the conduits (2a, 2b; 3) as inlet tubular feeders or / and the waste water flowing to the outlet (5) to the after-treatment plant (6) or / and the phase separator is purified in the sewer system itself. Method according to Claim 4, characterized in that a portion of the pumped manhole (la ... lh) is pumped to the outlet (5) of the sewage system with an increased oxygen content and containing activated sludge or anoxic effluent. with respect to the main flow direction (A) of the pointer, is fed back to the duct line (2a, 2b; 3) behind the respective pump shaft (1a ... lh) and this sub-quantity is selected so as to (h) expediently maintaining a constant or substantially constant floating depth and / or flow rate; and the resulting excess amount is pumped into the duct line (2a, 2b; 3) in front of the pump shaft (1a ... lh). Method according to claim 4 or 5, characterized in that, in the absence of raw sewage in each loop (h), for example at night, the treated wastewater in the loops (h) of the facility is pumped into the pump shafts (1). lh) maintaining a continuous flow by operating its pumps (8, 9). 7. Process according to any one of claims 1 to 4, characterized in that some loops (h) are fed with only oxygenated and activated sludge wastewater, and other loops (h) or loops are fed with only anoxic wastewater from the pump shafts (la ... lh). 8. A process according to any one of claims 1 to 3, characterized in that the waste water in the pump shafts (1 a to 1 h) is continuously aerated or mechanically stirred to render it anoxic.