DE102006025393B4 - wastewater treatment plant - Google Patents

Abstract

Small sewage treatment plant for the treatment of wastewater, comprising a first biology container (40, 40 ') and at least one second biology container (41-44), each biology container (40-44) having at least one inlet (10), one outlet (20) and a sludge return line (79) and a ventilation line (89) and a sludge collecting tank (50) with a pump (78), the biology tanks (40-44) via their inlets (10) and their outlets (20) as well as partially through the interior of the Biology containers (40-44) leading sludge return lines (79) and their ventilation lines (89) leading partially through the interior of the biology containers (40-44) can be connected to the sludge collecting container (50) via coupling elements arranged outside the biology containers (40-44) to form module chains are that the sludge return lines (79) form a sludge return line (70) from the sludge collecting tank (50) to the first biology tank (40, 40 '), the pump (78) of the Sludge collecting tank (50) is in operative connection with the sludge return line (70) in such a way that it removes residues from the sludge collecting tank (50) via the sludge return line (70) into the first biology tank (40, 40 '); and the ventilation lines (89) in the module chain are connected via coupling elements to form a ventilation line (80) for ventilation of the biology containers (40-44).

Description

The invention relates to a small wastewater treatment plant for the treatment of wastewater.

Small wastewater treatment plants are waste water treatment plants with a design value of less than 50 population equivalents. Thus, they are used in individual houses, small settlements, inns or shelters, but also in the industry for pre-treatment of waste water used.

Usually, such a small wastewater treatment plant consists of a grease separator, a biology container and a filter system. In the grease separator contained in the wastewater and floating fats are separated. In the biology container, the wastewater is often further clarified by means of an activated sludge process (also activated sludge process). In this case, the wastewater is largely freed from organic contaminants by biological activities of aerobic chemoorganoheterotrophic microorganisms, the so-called activated sludge.

A distinction is made in the activated sludge process between two approaches. On the one hand, the waste water can continuously pass through the biology container and thereby be cleaned; on the other hand, there are discontinuous processes in which wastewater is introduced into the biology container or the biology container and is suctioned off at specific intervals. Almost always the biology containers are additionally aerated to improve the degradation of wastewater pollution by the microorganisms.

In the secondary clarifier or in the sludge trap or in the transfer station sludge separation takes place. That is, the activated sludge and other solids are filtered out of the wastewater and either disposed of or recycled to the cleaning cycle.

Especially in the gastronomy sector and in industry, the dimensioning, ie the determination of a suitable size of the small sewage treatment plant, is a particular problem. Several factors are decisive here. It is important to consider the potential growth of the industrial plant or catering business and the amount of waste water generated. Other important factors are the degree of pollution of the wastewater, which can vary both in the short term and the long term, as well as the requirements for the purity of the filtered wastewater. For example, due to new legislation, the filtered wastewater that is disposed of in the public sewer system must have a lower fat content than was required at the time the small wastewater treatment plant was set up.

As described, the other factors involved in the dimensioning of the wastewater treatment plant may also vary. The problem for the operators of small wastewater treatment plants is that the wastewater treatment plant must be adapted to the conditions. To counteract this problem, it is sometimes necessary to purchase a completely new small sewage treatment plant or to fundamentally overhaul the existing small sewage treatment plant.

Furthermore, it is desirable for the efficient operation of a small sewage treatment plant, that this is adapted as accurately as possible to the circumstances. However, the individual production and coordination of the small sewage treatment plant on the conditions is very costly. Therefore, the small wastewater treatment plants are often oversized, causing a considerable financial outlay.

A small sewage treatment plant of the type mentioned is from the AT 000 624 U1 known.

Based on these problems, it is an object of the present invention to provide a small wastewater treatment plant that can be optimally adapted to any situation in a simple and cost-effective manner, and is easily expandable.

This object is achieved by a small wastewater treatment plant according to claim 1. Further advantageous embodiments will become apparent from the dependent claims.

In particular, the object is achieved by a waste water treatment plant comprising a first biology container and at least one second biology container, each biology container having at least one inlet, a drain and a mud return line and a ventilation line, and a mud trap with a pump the biology containers, via their inlets and outlets, and their partly through the inside of the biology container leading sludge return lines and their leading through the interior of biology container ventilation ducts with the sludge trap over arranged outside the biology container coupling elements are zusammenschließbar to module chains so that the sludge return lines of a sludge recirculation line of the Form sludge trap to the first biology container, the pump of the sludge trap with the Schlammrückf strand guide is in operative connection that they removes residues from the sludge trap container via the sludge return strand in the first container and Biology Ventilation lines in the module chain are connected together via coupling elements to form a ventilation line for the ventilation of the biology containers.

The central idea of the invention is therefore that several biology containers are connected in series and work together with a single sludge trap. Thus, the small wastewater treatment plant as needed, d. H. depending on the amount of wastewater and the degree of pollution. The biology reservoirs include mud return lines that cooperate in a combination of multiple biology reservoirs to form a mud return strand that serves to remove debris from the mud reservoir back into the biology reservoirs. The module chain thus looks like that the head of the chain is formed by a first biology container. This is followed by several second biology containers. The wastewater first passes through the first biology container, then the at least one second biology container, and then flows into the sludge trap in which residues, in particular biomass, ie activated sludge, are filtered out. These residues are transported against the flow direction of the waste water from the sludge trap back to the first biology container. Regardless of the number of biology containers used, the sludge return lines always provide a sludge return strand which ensures said return of residues.

To ensure the most efficient possible degradation in the biology containers, it is necessary to sufficiently aerate the biomass in them. For this purpose, the biology containers preferably comprise ventilation ducts which are arranged such that they form a continuous ventilation string in the said module chain. This ventilation string can provide air for the individual biology containers. In order to supply this air to the biology container, branches are preferably provided at each biology container, which discharge a portion of the air into the interior of the respective biology container. The modularity of the small sewage treatment plant is not affected by these ventilation pipes.

It is advantageous if the ventilation lines are arranged at least in sections, in particular in the region of the coupling elements, parallel to the sludge return lines on or in the biology containers. A simple connection of the biology container to each other and to the sludge trap is thus possible.

Preferably, the coupling elements of the vent line include vent line fittings. For the formation of the ventilation strand so only the individual fittings of biology containers must be put together.

Preferably, the first biology container comprises a mud return adapter for introducing the residues from the mud return strand into the inlet of the first biology container. The biology containers can therefore preferably be made substantially identical in construction. To form the module chain, so several of these identical biology containers are connected to each other. The result is said sludge recycling strand. At the inlet of the first biology container, the sludge return adapter is installed so that the residues transported via the sludge return line together with the untreated wastewater flow into the first biology container. The mud return adapter is preferably designed as a distributor pot.

It is particularly advantageous if the sludge collecting container comprises a ventilation source which can be coupled to the aeration strand. This ventilation source supplies air to the ventilation line for ventilation of the biology containers. The sludge collecting container preferably has at least one coupling which can be connected to the ventilation line of the biology container which is adjacent to it. The ventilation is thus ensured centrally by the sludge trap with preferably only one ventilation source.

Preferably, the sludge return lines are arranged at least in sections, in particular in the region of the coupling elements, parallel to the inlets and outlets. In the module chain, the sequence of the first biology container concludes with the feed of one of the second biology containers. The chain is continued until the end of the last biology container ends with an inlet of the sludge filter. The biology containers can be optimally interconnected when the mud return lines are parallel to the inlets and outlets. Thus, if the inlet of a biology container is coupled to the outlet of another biology container, the sludge return lines of the respective biology container form part of the sludge return line.

Preferably, the sewers (inlet and outlet), the vent lines and the mud return lines are substantially parallel in and / or at the biology containers.

Preferably, the coupling elements of the mud return lines comprise mud return line fittings. So the mud return line can be exactly as easy as the aeration line can be formed by screwing the individual mud return lines. A particularly simple assembly and disassembly of the small wastewater treatment plant is guaranteed.

Preferably, the inlet of each biology container is higher than its outlet, or is at the same level with this. The individual biology containers can therefore do without a pumping device. The waste water enters the biology tank via the feed, fills it up to the level of the drain and exits through the drain. If the difference in height of the inlet is chosen to be suitable for the drainage, the drainage of the wastewater is prevented.

The biology containers preferably comprise height-adjustable container feet. In the module chain, therefore, the height of the individual biology containers can be designed so that there is a certain gradient from the first biology container to the mud collection container. Thus, in the entire chain of biology containers can be dispensed with pumps, since a flow of wastewater from the inlet of the first biology container is formed by all second biology container to the sludge trap. An individual design of the biology containers according to their position in the module chain can be dispensed with.

The small sewage treatment plant preferably comprises at least one grease separator which can be coupled to the first biology container. Thus, a common module chain is composed of a grease trap, followed by several biology containers, completed by a mud trap. In a first step, the grease separator filters fats out of the wastewater before the wastewater in the biology tanks is cleaned in a further step.

The invention will be described with reference to several embodiments, which are explained in more detail by means of illustrations. Hereby show:

1 the exterior of a biology container;

2 a first schematic cross section through the biology container 1 ;

3 a second schematic cross section through the biology container 1 ;

4 a plan view of a module chain, comprising a plurality of biology containers and a transfer station;

5 a side view of the module chain 4 ;

6 another module chain in plan view, comprising a plurality of biology containers and a transfer station; and

7 a side view of the module chain 6 ,

In the following description, the same reference numerals are used for the same and like parts.

An inventive biology container 40 as he is in 1 is shown, has a substantially cylindrical shape. To set up the biology container 40 are at the bottom of container feet 2 appropriate. For emptying an interior 30 , z. For maintenance or cleaning, includes the lower portion of the biology container 40 also a drainage pipe 92 and a drain valve 94 , The drainage pipe 92 flows through an emptying opening 90 (see. 2 ) in the interior 30 of the biology container 40 ,

In the upper area has the biology container 40 an access opening 1 which extends substantially parallel to the base of the cylinder and the maintenance and control of the biology container 40 allows. Next to the access opening 1 there is a vent 68 about which in the biology container 40 introduced air from the interior 30 can escape.

Also in the upper region, two tubes extend parallel to the bottom portion partially through the interior of the biology container 40 , These tubes are substantially parallel to each other, and their end portions also terminate parallel to each other. The pipes are a ventilation pipe 89 and a mud return line 79 , The one end of the mud return line 79 and the ventilation line 89 essentially closes parallel to an inlet 10 of the biology container 40 from. About this inlet 10 Wastewater enters the interior 30 of the biology container 40 , The other side of the biology container behaves essentially symmetrically 40 , The end of the ventilation line 89 , as well as the mud return line 79 essentially flows parallel to the process 20 through which the wastewater from the interior 30 of the biology container 40 exits again.

The mud return lines 79 as well as the ventilation pipes 89 extend substantially continuously from one side to the other side of the biology container 40 , They serve to transport residues or air. The vent line 89 has approximately in the middle a branch, over which a part of the transported air by means of a ventilation supply line 66 for the biology container 40 is branched off. The ventilation supply line 66 directs this portion of the air outside the container down to a vent plug 60 (see. 3 ), which are located in the floor area of the interior 30 extends. The ventilation candle 60 is on the outside of the biology container 40 by means of a ventilation plug attachment 64 attached and protrudes into the interior 30 into it.

To clarify the inner life of the biology container 40 put the 2 and 3 a cross section through this from opposite directions. It turns out that the interior 30 over a perforated plate 36 is divided into two chambers. In the lower part of the biology container 40 a slightly smaller prechamber 32 and in the upper area a main chamber 34 , Said filter candle 60 extends across the antechamber 32 that over the air vent 60 introduced air rises through the perforated plate 36 in the main chamber 34 and supplies the local biomass, which, among other things, to growers 38 colonized bacteria, with the necessary for the degradation process of the wastewater oxygen. The rising air can then pass through the vent 68 escape.

That over the inlet 10 introduced wastewater is in the interior 30 through an inlet pipe 12 extending substantially along the shell of the cylinder of the biology container 40 extends into the lower area, ie in the antechamber 32 derived. The sewage also rises from the antechamber 32 into the main chamber and passes in the upper part to the drain 20 , A mounted in the upper area further perforated plate 37 holds larger solids in the main chamber 34 back. The two perforated sheets 36 and 37 form a defined area.

Due to the arrangement of the ventilation pipes 89 , the mud return lines 79 and the inlet 10 and the process 20 can be several biology containers, which are essentially identical to the described biology container 40 are to merge into a chain. The 4 and 5 show a first embodiment of such a module chain. Here are three essentially identical biology containers 40 - 42 connected in series. The last link of the module chain forms a sludge trap or a transfer station 50 , The wastewater passes through the inlet 10 of the first biology container 40 in its interior 30 and steps over the process 20 already pre-cleaned again. The sequence 20 of the first biology container opens directly into the inlet 10 of the second biology container 41 and its course 20 again directly into the inlet of the third biology container 42 , After sufficient biological clarification, the wastewater passes from the second biology container 42 about its expiry in the transfer station 50 , That's about its inflow 10 incoming wastewater is transferred to the transfer station 50 freed from further residues that accumulate there. More precisely, z. B. the biomass, which was flushed through the wastewater in the bottom area of the transfer station 50 from and is from there by means of a pump 78 at appropriate time intervals in the biology containers 40 - 42 recycled. To the process 20 the transfer station passes only the purified surface water, which is substantially free of residues, in particular of biomass.

To return the biomass from the transfer station 50 in the biology containers 40 - 42 to ensure the module chain of the first embodiment forms a sludge recycling strand 70 out to the pump 78 connected. The individual mud return lines 79 , each containing parts of the biology containers 40 - 42 are, by means of several couplings, so-called mud return line fittings 71 , to the mud recycling strand 70 together. A mud return line fitting 71 exists, as from the 1 and 2 seen from a mud return line nut 72 and a mud return line cutting ring 73 , To connect two biology containers, they are screwed together. This results in a continuous mud return strand 70 which reaches to the first biology container of the module chain. There are by means of a mud return adapter 76 the residues from the transfer station 50 in the inflow of the first biology container 40 initiated.

The transfer station 50 also includes a ventilation source for supplying the individual biology containers 40 - 42 with sufficient air. To each of the biology containers 40 - 42 to supply is a ventilation line 80 provided substantially parallel to the mud return strand 70 extends. Similar to the mud recycling strand 70 is also the ventilation line 80 from several ventilation pipes 89 together, as already described, in each case parts of the respective biology container 40 - 42 form. The ventilation pipes 89 Be via coupling elements, in particular via vent pipe fittings 81 attached to each other. How out 1 can be seen, include these vent line nuts 82 and vent line cutting rings 83 involved in the coupling of individual biology containers 40 - 42 interlock. That of the transfer station 50 opposite end of the ventilation line 80 is closed. As already described, air comes out of the ventilation line 80 in the respective biology container 40 - 42 ,

A second embodiment of a module chain is in the 6 and 7 shown. There are three biology containers each 40 - 42 respectively. 40 ' - 44 in a series of biology containers. The sewage to be clarified is via a T-piece or a distribution pot 4 in equal parts in the first and second series of biology containers 40 - 44 initiated. After the sewage the respective series of biology containers 40 - 44 has passed through, it is about a further T-piece or another distribution pot 4 ' merged again and passes over the inflow 10 in the transfer station 50 , Neither the transfer station 50 even the individual biology containers 40 - 44 of the second embodiment are different from those of the first embodiment.

Both the first series of biology containers 40 - 42 , as well as the second series of biology containers 40 ' - 44 each form a ventilation line 80 and a mud recycling strand 70 out. To feed these strands through the transfer station 50 further distribution pots are provided. The residues from the transfer station 50 are each in the front biology container 40 respectively. 40 ' initiated the respective series. Similar to the first embodiment, this is in each case a mud return adapter 76 at the inlets 10 the biology container 40 and 40 ' intended.

Based on the embodiments, it can be seen that due to the modular design of the small wastewater treatment plant any number of biology containers 40 - 44 can be combined with each other as required. An individual education of the individual biology containers 40 - 44 is not necessary. Through simple coupling elements, ie through the sludge return line fittings 71 and vent pipe fittings 81 result in continuous mud return strands 80 and ventilation strands 70 , The modularly combined biology containers 40 - 44 So in the end, they act like a single large biology container.

It is obvious to the person skilled in the art that the flow rate of a small wastewater treatment plant can be increased by connecting several biological container series in parallel according to the second embodiment. By extending the individual series, ie by the provision of multiple biology containers 40 - 44 in a chain, a higher degree of contamination of the wastewater can be handled. It is thus possible for the person skilled in the art to make provision for each application without major construction costs. An expansion of the small wastewater treatment plant is also easily possible due to the modularity.

Often you switch to the biology containers 40 - 44 a grease separator.

LIST OF REFERENCE NUMBERS

1

access opening

2

bowl foot

4, 4 '

distributor head

10

Intake

12

inlet pipe

20

procedure

30

inner space

32

antechamber

34

main chamber

36, 37

perforated sheet

38

growth carrier

40-44

Biology container

50

Transfer station

60

ventilation candle

64

Ventilation plug attachment

66

Inflation Line

68

vent

70

Sludge return track

71

Schlammrückführungsleitungsverschraubung

72

Mud return line Mother

73

Mud return line cutting ring

76

Sludge recycling Adapter

78

Sludge recirculation pump

79

Mud return line

80

ventilation strand

81

Belüftungsleitungsverschraubung

82

Vent line Mother

83

Vent line cutting ring

89

vent line

90

emptying opening

92

drain line

94

drain valve

Claims (11)

Small sewage treatment plant for the treatment of waste water, comprising a first biology tank ( 40 . 40 ' ) and at least one second biology container ( 41 - 44 ), each biology container ( 40 - 44 ) at least one inlet ( 10 ), a procedure ( 20 ) as well as a sludge return line ( 79 ) and a ventilation duct ( 89 ) and a sludge trap ( 50 ) with a pump ( 78 ), the biology containers ( 40 - 44 ) on their inflows ( 10 ) and their processes ( 20 ) as well as their part through the inside of the biology container ( 40 - 44 ) leading sludge return lines ( 79 ) and their partly through the inside of the biology container ( 40 - 44 ) leading ventilation ducts ( 89 ) with the sludge catcher ( 50 ) beyond the biology containers ( 40 - 44 ) arranged coupling elements to module chains are zusammenschließbar that the sludge return lines ( 79 ) a mud return strand ( 70 ) from the sludge catcher ( 50 ) to the first biology container ( 40 . 40 ' ), the pump ( 78 ) of the sludge trap ( 50 ) so with the mud return strand ( 70 ) is in operative connection with removing residues from the sludge trap ( 50 ) over the mud return strand ( 70 ) in the first biology container ( 40 . 40 ' ) dissipates; and the ventilation pipes ( 89 ) in the module chain via coupling elements to a ventilation line ( 80 ) for the aeration of biology containers ( 40 - 44 ). Small wastewater treatment plant according to claim 1, characterized in that the ventilation line ( 89 ) at least in sections parallel to the sludge return lines ( 79 ) at the biology containers ( 40 - 44 ) are arranged. Small wastewater treatment plant according to claim 1 or 2, characterized in that the coupling elements of the ventilation lines ( 89 ) Ventilation line fittings ( 81 ). Small sewage treatment plant according to one of the preceding claims, characterized in that the first biology container ( 40 . 40 ' ) a mud return adapter ( 76 ) for discharging the residues from the sludge recycling line ( 70 ) in the inlet ( 10 ) of the first biology container ( 40 . 40 ' ). Small wastewater treatment plant according to one of the preceding claims, characterized in that the biology containers ( 40 - 44 ) are identical. Small wastewater treatment plant according to one of the preceding claims, characterized in that the sludge collecting tank ( 50 ) one with the ventilation line ( 80 ) comprises a detachable ventilation source. Small sewage treatment plant according to one of the preceding claims, characterized in that the sludge return lines ( 79 ) at least in sections parallel to the inlets ( 10 ) and processes ( 20 ) are arranged. Small wastewater treatment plant according to one of the preceding claims, characterized in that the coupling elements of the sludge return lines ( 79 ) Sludge return fittings ( 71 ). Small sewage treatment plant according to one of the preceding claims, characterized in that the inlet ( 10 ) of each biology container ( 40 - 44 ) is higher than its expiration ( 20 ). Small wastewater treatment plant according to one of the preceding claims, characterized in that the biology containers ( 40 - 44 ) height-adjustable container feet ( 2 ). Small sewage treatment plant according to one of the preceding claims, characterized by at least one grease separator which is connected to the first biology container ( 40 . 40 ' ) is detachable.

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