Sludge dewatering

Due to the way of work, Bucher piston presses belong to the group of the most efficient devices in the field of municipal sludge dewatering. Their design and quality proved, by many references, that their technical durability equals more than forty years. The manufacturer of these presses is Bucher Unipektin AG from Switzerland and Proffico is the distributor in the municipal and industrial sectors in Poland. Pulawy and Radom are the first completed installations using Bucher piston presses in Poland.

PISTON PRESSES OPERATING PRINCIPLE

 

The main elements of the press is a cylinder and a piston. Between the piston and the cylinder, there are placed special drains discharging filtrate to the wastewater system. The mixture of the sludge with the flocculant is fed to a cylinder with a spiral pump, filling the free space between the drains. The size of the cylinder and the number of drains (including the filtration area) determines the productivity of the press. The principle of operation is identical as in the piston engines with the phase of the cyclic compression and decompression, but the piston with the cylinder additionally rotates around its axis at a speed of approx. 6 rpm and the space in the cylinder is filled with the sludge. The pressure in the compression chamber usually equals around 5 bars and is created by pressing the piston with the hydraulic cylinder. The drains were designed in a way so that during the pressing (compression) they squeeze into the sludge, carrying away the excess filtrate. Each of the drains consists of a grooved core made of polyurethane, which provides flexibility for approx. 12 000 hours of work. At the core there is a filtering cloth, through which the filtrate from the sludge outflows. Usually, the filtering cloth durability equals 2.5 thousand hours. Replacement of the filtering cloth is extremely easy, and it involves disconnecting the drain, tightening the new filtering cloth, re-inserting the drain. The operator’s technical personnel can do the work.

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PHASES OF WORK

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Filling

The hydrated sludge is placed centrally in the cylinder filling up the entire space. When filling with the sludge, the piston of the cylinder is automatically pushed to the end position, causing a slight overpressure. As a result, the excess of the free water (unbound with the sludge) is discharged through the drains to the wastewater system. The cycle of filling and replenishing the chamber takes place several times which lasts around 40 minutes in total, but the filling pump works for around 8 minutes.

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Pressing and loosening

After completion of the filling phase, pressing and loosening of the sludge take place. Usually, a complete cycle lasts approx. 70-80 minutes. Pressing is performed by the forth motion of the piston, rotating the chamber and the piston at the same time. This phase is repeated cyclically, whereas every time the feed of the piston is larger by a few millimetres from the previous one, up to achieving the assumed distance of the piston to the head or achieving the upper limit for the sludge dewatering. In this case, there is a principle that with the smaller distance from the head of the piston, the greater degree of the sludge dewatering is achieved.

The loosening always takes place after the pressing cycle and is designed to move the dewatered sludge inside the chamber and clean the pores of the filtering cloth on the drains. The clean up takes place automatically by air purging through the drains formed at the air intake at the backwards motion of the piston (underpressure). The continuous rotation connected with the position change of the drains provides crushing of the filter cake and its relative movement.

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Emptying

The emptying of the sludge phase proceeds after completion of the pressing and loosening phase. At this stage, the cylinder is disconnected from the head while maintaining the rotation of the whole. The piston moves towards the cylinder head to discharge the sludge completely, crushing the filter cake and pushing it outside the cylinder. After completion of the emptying phase, it is automatically followed by the filling phase.

RANGE
HPS 3007 HPS 6007 HPS 7507 HPS 12007
Volume of the cylinder [l] 3’300 6’000 7’500 12’000
Number of drains [pcs/m2] 68 / 20 120 / 40 120 / 50 170 / 80
Capacity [kg. m./h]* 140 300 380 500
Power connection [kW] 18 28 28 37
Power consumption [kW] 9 15 16 25

*- the estimated value for the sludge input with a dry solids content of 3-4%.

PERIPHERAL DEVICES AND CONTROL

The sludge from the storage tank is fed to the press with the usage of the spiral pump. Because the press works batch wise during the filling, the pump has a relatively high capacity (the total pump running time equals approx. 6-8 minutes per full cycle). During pumping the sludge is mixed with a flocculant solution by the special dynamic mixer. Every dewatered installation is equipped with a drainage microwave measurement of dry solids, so the flocculeat dosing takes place only as a function of dry substance and flow rate. Such a solution effectively eliminates an overdose of the polymer. On the pipelines, with the sludge and flocculant, there are installed flow meters, giving a real indication of the flow of these two media. According to the DWA guidelines, there is used only a two sequential station of polymer with separate tanks, where the mixing and maturing of the solution take place. The inlet of the press is connected to the dynamic mixer with the pipe of the appropriate proportion of length to the diameter ratio, ensuring the adequate contact time. At the press there is mounted the power supply with the control system cooperating with the main electrical switchboard of the entire sludge dewatering installation. An interesting thing is unprecedented in other technologies continuous monitoring of the average dry solids of the sludge during the dewatering process. The press also has a control panel providing the full access to the current and archived data and enabling manual control of the device. The self-automated operation of the device is possible there thanks to such solutions with a “human factor” limited to a minimum.

OPERATING ASPECTS

Effects of dewatering process

The Bucher piston presses give the user the greatest opportunities for sludge dewatering, as the only restriction is so called “the upper limit of dewatering”. This limit is determined for each sludge separately informing what maximum level of dry solids can be achieved using mechanical methods of dewatering. It depends entirely on the characteristics of the sludge which in turn reflects the adopted technology and the quality of the wastewater at the inlet to the treatment plant, and this in turn determines the amount of water bound with bacteria. In practice, it can be said that if the upper limit of dewatering is low e.g. 25% DS then the difference of dewatering in comparison to the conventional solutions are not as wide as in the case of the limit of dewatering at the level of 35% or 40% DS.

wykres1

W

While choosing the technology for sludge dewatering, the technical progress within the disintegration of the bacteria cells should be taken into account, as it usually results in increased limit of dewatering. The Bucher piston presses were tested at several disintegration systems with scores ranging from 45% to 50% DS and in the case of one of the new technologies, the level of 70% DS of dewatering has been achieved. It is worth noticing that such large increases in the effects of dewatering are no longer possible with the use of traditional devices for dewatering like belt presses and centrifuges.

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Regardless of the chosen way for sludge dewatering, it is always recommended to perform the pilot tests. The aim of the pilot tests in the case of the Bucher piston presses is obtaining the basic information about the possible degree of the sludge dewatering, the chemical consumption and possible to achieve hydraulic capacities. Previous tests on municipal sludge in Poland confirmed susceptibility of the sludge for dewatering in the range of 23 to 37% DS for the digested sludge and undigested one without the use of disintegration /hydrolysis. Performing such tests gives the user information on the expected results of the dewatering process to deal with the sludge of the similar characteristics in the future.

In our view, the selection of the sludge dewatering process, and thus the achieved results, depends mainly on further forms of sludge management. As a result, it might turn out that the increase in dry solids has been recorded after the application of the piston press e.g. at the level of 8-10% DS. It gives a 30% reduction in weight of the sludge implying great savings to the user who dries it or burns it. The below graph fully captures the essence of the results in the dewatering process in economic terms. The graph is a curve where the largest increases in the reduction of the sludge weight are obtained in the range up to 40% DS.

Therefore, from the operator’s point of view, the most effective method for reducing the operational costs of sludge management is mechanical dewatering. From the previous experience with the Bucher piston presses operation at the municipal wastewater treatment plants, it can be stated that the results of the dewatering range from 25 to 45% DS and they are limited by ‘the upper limit of dewatering” only.

Wykres redukcji masy osadów w zależności od zawartej suchej masy. Przykład: zwiększenie stopnia odwodnienia z 15 do 30%s.m. zmniejsza wagę osadów o połowę.

Power consumption

The Bucher piston presses, due to the hydraulic principle of their operation, belong to the group of energy-saving devices. In our opinion, to fairly compare the power consumption of different technologies, we should relate to the power consumption of the entire sludge dewatering plant and not only to the individual, particular devices. Only the analysis executed in this way (taking into account the time and the power of all peripheral devices with the same output parameters) gives a realistic picture of the power consumption at the given installation. The usage of the objective indicators may prove helpful in this case.

Most of us use an indicator expressed in [Wh/kgDS] which is incorrect in our opinion, as it does not take into account the effects of the dewatering process and with the same measure refers to the dewatering device, e.g. to 15% DS and to the device giving 30% DS. The much more reliable indicator is the one expressed in [Wh/kgH2O]. This indicator, relating to the entire installation, falls within the range of 1.5 to 2 Wh/kgH2O in the Bucher piston presses. This result classifies the Bucher presses at the forefront on the market.

Chemicals consumption

A coagulant and flocculant consumption is comparable to other methods and usually remains at the level of 6-16kgAS/tDS solid. The exact value of consumption is determined at the stage of pilot tests or the start-up of the plant installation. Regardless of local conditions during the installation, there are always used all available solutions reducing consumption of the polyelectrolytes e.g. the use of a dynamic mixer, a sequential station for the preparation of polyelectrolytes, the extended maturation period, the measurement of dry solids.

Filtrate

Due to the principle of operation, the Bucher piston press is characterised by the cleanest filtrate from all available dewatering methods. Usually, the suspended solids in the filtrate do not exceed 100 mg/l. It should be noted that the sludge (including suspended solids) accumulates 90% of the phosphorus in wastewater. Therefore, the method of the sludge dewatering characterised by poor quality of the filtrate effects in reversing of the phosphorus to the treatment plant with the necessity of its re-precipitation. Additionally, the dirty filtrate causes the systematic introduction of high loads requiring intensive treatment process and thus incurring the increased operational costs.

Tames Water, the private user of the wastewater treatment plant in London, has noticed the advantage of this. As the result of the thermo-hydrolysis processes on the sludge, the filtrate from the dewatering process contained massive loads, which were reverted to the treatment plant. Also, in this case, a huge advantage of the Bucher press was the quality of effluent (the reduction of the suspended solids).

Odour

Press piston due to their specific nature does not cause significant odour emissions to the environment. During a complete cycle of filling, pressing and loosening it is hermetically closed, opening only for 8 minutes at the emptying phase. However, the sludge, in this case, does not emit significant odour (usually sludge after the dewatering has a loose form and a slightly earthy smell). As a result, the installation does not require mounting any special materials resistant to the aggressive odour outside.

Noise

The piston press causes noise during operation at a level below 85dB. Such a value is acceptable by the service personnel and does not cause undue inconvenience (range between the loud music and the traffic).

REFERENCES

The Bucher piston press for sludge dewatering has been widely used in municipal, chemical, paper, pharmaceutical, leather, agricultural and food industry since 1965. Almost 3,000 equipment is currently operated unattended in a continuous mode in the whole world. Usually, the life expectancy of these machines equals approximately 40 years and the maintenance and repair costs are fully acceptable. The piston presses have been present at the urban wastewater treatment plants for more than ten years in the European countries such as Germany, England, Switzerland, Austria, Sweden or Norway. The largest municipal installation so far supports London where 19 Bucher presses have been installed in four wastewater treatment plants (Oxford, Becktan, Crossness, Longrich). In Poland, there are more than 250 devices used currently, mainly in the food industry. The oldest one is already more than 45 years and still works in a continuous mode. Radom and Pulawy are the first municipal sludge dewatering installations in Poland with Bucher presses installed. In both installations, there is used the most traditional model of the press – HPS 7507.

zdj 15 Instalacja Mechanicznego Odwadniania Osadów w Radomiu

Sludge dewatering treatment plant in Pulawy

zdj 14 tytuł Instalacja Mechanicznego Odwadniania Osadów w Puławach
Sludge dewatering treatment plant in Radom

STRENGTHS AND WEAKNESSES of Bucher Presses

In comparison to conventional methods of sludge dewatering, Bucher presses have the following advantages:

  • sludge dewatering to the physical limits;
  • more than 40 years of the technical life expectancy;
  • low power consumption (up to 2 Wh/kgH2O);
  • no odour emission (closed system);
  • the high quality of the filtrate (the suspended solids level up to 100 mg/l);
  • the process flexibility;
  • the process control by constant measurement of the dewatering degree;
  • self-cleaning of the filtering cloth by generating a counter-current flow of air during the piston reversion;
  • the simplicity of maintenance generating low expenditures for maintenance and repair.

The disadvantage of the Bucher piston press is its size and the relatively high investment costs, which constitute a barrier for some smaller users of the treatment plant. Furthermore, Bucher piston presses require skilled personnel to operate them, the stable flocculation process as well as the feed at a level greater than 2% D.S. By the experience from the installations in Pulawy and Radom, it can be stated that the presses accept only the correct systems of the sludge transport. The solutions that are acceptable for typical liquid sludge will not be useful in the case of dry sludge. To ensure the correct transport of the sludge from the piston press, having the form of loose soil in and small granules, the filling factor of the spiral conveyors should not be greater than 30%.

SUMMARY

The piston presses for sludge dewatering are the most expensive devices on the market. The price contains technology that enables the most efficient sludge dewatering combined with the excellent craftsmanship. The food industry recognised the advantage of it several decades ago, and the Bucher presses almost entirely dominated the market so far. Why does it happen? The answer is simple – the technique of continuous pressing and mixing of the sludge proved to be most effective in its performance, remaining for many years unrivalled in the market despite the relatively high price. Is it the same with the municipal sludge? It can be said that in most cases – yes. The crowning confirmation of this fact is the installation in London, where the private operator Tames Water resigned from existing methods and devices for sludge dewatering replacing them with Bucher piston presses.

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Waste water treatment plant in Pulawy – dewatered sludge on Bucher piston press – 28% DS.
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Waste water treatment plant in Radom – dewatered sludge on Bucher piston press – 31% DS.

BUCHER PRESS APPLICATION AND TYPICAL FORMS OF SLUDGE TREATMENT

Agriculture and landfilling sludge treatment

Both of these methods belong to the cheapest forms of sludge treatment. However, they have some deficiencies. Besides formal or legal deficiencies in the use of these methods, is odour generated, as well as the expensive transport to the recipient. In this case, the effective dewatering with the use of Bucher presses allows reducing odour emission and reducing the amount of transported sludge.

Solar dryers

This method has many supporters, who are captivated by the technical simplicity of this installation and declared operating costs. The fact is that the solar energy is free and what is more, the waste heat from the cogeneration process can support drying process. However, many of the users, who built such a dryers, quickly came to the conclusion that their surface is inadequate especially in winter. At this time, the drying process practically does not take place, because there is hardly any sunshine and the entire waste heat is consumed for heating the digester. Unfortunately, dryers act only as the magazines then. Therefore, the best sludge dewatering is essential also in this case. It is worth noticing that a typical indicator used for solar drying in Poland is 1 tonne of evaporated water during the year per 1 m² of the dryer’s surface. In practice, it means that, for our exemplary installation (6 t DS/d) to dry the sludge from 20 to 60% DS. The required surface of the greenhouse is 7 300 m². With the use of Bucher presses for the same effects the required surface can be reduced to less than 4250m², which assuming the average cost of mounting such a dryer is PLN 2 500/m² (570 EUR), it gives the amount of PLN 10 million (2,4 million EUR) savings. This is much more than the cost of the Bucher press.

Thermal dryers

Thermal dryers in combination with co-incineration in a cement plant are the most eco-friendly method of the sludge treatment. Now, the production capacity of all the dryers in Poland (including the ones under construction) equals almost 130 000 t DS /year which covers over 20% of the total generated sludge amount. As for the country making up for the previous years, it seems to be a decent value, but unfortunately only in theory. Many of the built dryers are simply out of service mainly due to technical problems, but also due to the operating costs, which are higher than alternative methods as for today. If we approach this issue in a business-like way, without taking into account the ecological objectives and making an honest assessment of the return on investment, we will quickly come to the conclusion that the real cost of drying the sludge to 92% DS is around 230 PLN (52 EUR) per tonne of dewatered sludge (NPV>0) in this case. The analysis of variable costs shows that nearly 60% of the cost is generated by the thermal energy and approx. 13% – by electrical energy (for the thermal energy ratio at 0,80kWh/kgH²O level and electrical energy at 0.10 kWh/kgH2O). What should be done then to reduce operating costs of the dryer? The simplest answer is to „dewater sludge to the technical limits of the devices with conventional energy and chemicals usage to remain less water for evaporation in the drying process.”

Sludge incinerations

They are dedicated mainly for large agglomerations, but they are also popular in smaller towns in Poland. Although it sounds paradoxical, the real operating costs of the installation are even higher than in the case of thermal drying. It happens mainly due to generated ashes, after treatment system and the lack of autothermic process. A few years ago there was an assumption that the amount of heat from the sludge incineration process would be sufficient for drying the sludge, and even for the use as the additional waste heat. Now it is known that the life is harder… The use of Bucher presses, considered as the most efficient way of mechanical sludge dewatering, allows “fixing” energy balance of the incineration, thereby further reducing the operational costs of the installation.

BUCHER PISTON PRESSES – SELECTED REFERENCES FROM WASTEWATER TREATMENT PLANTS

1 Byullae

KOREA

100 000 PE

Press type: HPS 3007 + HPS 6007

Max dewatering: 36% DS

digested municipal sludge

9 Radolfzell

GERMANY

80 000 PE

Press type: HPS 5007

Max dewatering: 39% DS

digested municipal sludge

2 Schweim / Wupperverband

GERMANY

40 000 PE

Press type: HPS 3007

Max dewatering: 35% DS

digested municipal sludge

10 Minden

GERMANY

240 000 PE

Press type: 3 x HPS 7507

Max dewatering: 32% DS

digested municipal sludge

3 Saarlouis

GERMANY

85 000 PE

Press type: HPS 5007

Max dewatering:: 29-31% DS

digested municipal sludge

11 Gross-Gerau

GERMANY

40 000 PE

Press type: HPS 5007

Max dewatering: 28-34% DS

digested municipal sludge

4 Lippeverband

GERMANY

40 000 PE

Press type: HPS 3007

Max dewatering: 28% DS

digested municipal sludge

12 Hamar

NORWAY

130 000 PE

Press type:2 x HPS 6007

Max dewatering: 40% DS

municipal sludge + thermal hydrolysis

5 Der Heller Leder GmbH & Co.

GERMANY

industry

Press type: HPS 6007

Max dewatering: 28-34% DS

excessive sludge – tannery

13 Strommen

NORWAY

250 000 PE

Press type: HPS 3007 + 6007

Max dewatering: 40% DS

municipal sludge

6 Rodental / Bayern

GERMANY

100 000 PE

Press type: HPS 3007

Max dewatering: 32% DS

digested municipal sludge

14 Bara Boxmark Leather Feldbach

AUSTRIA

industry

Press type:2 X HPS 6007

Max dewatering:: 42-45% DS

excessive and primary sludge – tannery

7 Lingen

GERMANY

195 000 PE

Press type:2 x HPS 5007

Max dewatering: 28% DS

digested municipal sludge

15 Bara Boxmark Leather Jennerstorf

AUSTRIA

przemysł

Press type:2 x HPS 6007

Max dewatering: 45-52% DS

excessive and primary sludge – tannery

8 Bitburger

GERMANY

industry

Press type: HPS 6007

Max dewatering: enormous

excessive sludge – brewery

16 Bara Wollsdorf Leather

AUSTRIA

industry

Press type: HPS 6007

Max dewatering: 50-52% DS

excessive and primary sludge – tannery

17 Radom

POLAND

360 000 PE

Press type:2 x HPS 7507

Max dewatering: 30% DS

digested municipal sludge

23 Pulawy

POLAND

84 000 PE

Press type: HPS 7507

Max dewatering: 28% DS

digested municipal sludge

18 London Oxford / Thames Wate

 UK

1 500 000 PE

Press type:5 x HPS 7505

Max dewatering: 31-40% DS

municipal sludge + thermal hydrolysis

24 London Crossnes / Thames Water

 UK

2 000 000 PE

Press type:5 x HPS 7507

Max dewatering: 33-43% DS

municipal sludge + thermal hydrolysis

19 London Beckton / Thames Water

 UK

3 500 000 PE

Press type: HPS 5007

Max dewatering: 38-41% DS

municipal sludge + thermal hydrolysis

London Longrach / Thames Water

 UK

2 500 000 PE

Press type:5 x HPS 7507

Max dewatering: start-up 2015

municipal sludge + thermal hydrolysis

20 Aix Beziers

FRANCE

250 000 PE

Press type:2 x HPS 7507

Max dewatering: 28% DS

excessive municipal sludge

25 Strasbourg Valorhin

FRANCE

1 000 000 PE

Press type: HPS 12007

Max dewatering: 33% DS

industrial + municipal sludge

Weyersheim

FRANCE

30 000 PE

Press type: HPS 3007

Max dewatering:: 30% DS

Excessive sludge – tannery

Symeval

FRANCE

PE – N/A

Press type: HPS 3007

Max dewatering: 38-42% DS

aqueous washing liquids dewatering

– SUW

21 Milano

ITALY

600 000 PE

Press type: HPS 6007

Max dewatering: 28-32% DS

excessive municipal sludge

26 Conza

ITALY

Press type: HPS 3007

Max dewatering: 34-40% DS

aqueous washing liquids dewatering

– SUW

22 Zwillikon

SWITZERLAND 

40 000 PE

Press type: HPS 5007

Max dewatering: 38% DS

digested municipal sludge

27 Victoriaville

CANADA

Press type:2 x HPS 7507

Max dewatering: 22% DS

excessive sludge – dairy

VIDEOS

BUCHER– operating principle (animation)

BUCHER – sludge discharging

 

Bucher – wymiana drenażu

Bucher – wyładunek Zwillikon

REFERENCES

Tłokowe prasy Bucher – wybrane referencje z oczyszczalni ścieków.

Kraj Miejscowość / użytkownik Typ prasy RLM Max. odwodnienie Rodzaj osadu
Polska Radom 2 x HPS 7507 360’000 rozruch 2015 osad komunalny przefermentowany
Polska Puławy HPS 7507 84’000 rozruch 2015 osad komunalny przefermentowany
Wielka Brytania Londyn Oxford / Thames Wate 4 x HPS 7507 1’500’000 31-40% s.m. osad komunalny przefermentowany z termohydrolizą
Wielka Brytania Londyn Crossnes / Thames Water 5 x HPS 7507 2’000’000 33-43% s.m. osad komunalny przefermentowany z termohydrolizą
Wielka Brytania Londyn Beckton / Thames Water 5 x HPS 7505 3’500’000 38-41% s.m. osad komunalny przefermentowany z termohydrolizą
Wielka Brytania Londyn Longrach / Thames Water 5 x HPS 7507 2’500’000 rozruch 2015 osad komunalny przefermentowany z termohydrolizą
Niemcy Schweim / Wupperverband HPS 3007 40’000 35% s.m. osad komunalny przefermentowany
Niemcy Radolfzell HPS 5007 80`000 39% s.m. osad komunalny przefermentowany
Niemcy Rodental / Bayern HPS 3007 35`000 32% s.m. osad komunalny przefermentowany
Niemcy Lippeverband HPS 3007 40`000 28% s.m. osad komunalny przefermentowany
Niemcy Minden 3 x HPS 7507 240`000 32% s.m. osad komunalny przefermentowany
Niemcy Saarlouis HPS 5007 85`000 29-31% s.m. osad komunalny przefermentowany
Niemcy Gross-Gerau HPS 5007 40`000 28-34% s.m. osad komunalny przefermentowany
Niemcy Lingen 2 x HPS 5007 195`000 28-42% s.m. osad komunalny przefermentowany + przemysł
Niemcy Bitburger HPS 6007 przemysł b.d. osad nadmierny – browar
Niemcy Der Heller Leder GmbH & Co. HPS 6007 przemysł 28-34% s.m. osad nadmierny – garbarnia
Korea Byullae HPS 3007 + 6007 100`000 36% s.m. osad komunalny przefermentowany
Szwajcaria Zwillikon HPS 5007 40`000 38% s.m. osad komunalny przefermentowany
Norwegia Hamar 2 x HPS 6007 130`000 40% s.m. osad komunalny przefermentowany z termohydrolizą
Norwegia Strommen HPS 6007 250’000 40% s.m. b.d
Austria Bara Wollsdorf Leather HPS 6007 przemysł 50-52% s.m. osad wstępny i nadmierny – garbarnia
Austria Bara Boxmark Leather Feldbach 2 x HPS 6007 przemysł 42-45% s.m. osad wstępny i nadmierny – garbarnia
Austria Bara Boxmark Leather Jennerstorf 2 x HPS 6007 przemysł 45-52% s.m. osad wstępny i nadmierny – garbarnia
Francja Aix Beziers 2 x HPS 7507 250`000 28% s.m. osad komunalny nadmierny
Francja Strasbourg Valorhin HPS 12007 1’000’000 33% s.m. osad komunalny przefermentowany + przemysł
Francja Weyersheim HPS 3007 30`000 30% s.m. osad komunalny wstępny i nadmierny + przemysł
Francja Symeval HPS 3007 nie dotyczy 38-42% s.m. odwadnianie wód popłucznych – SUW
Kanada Victoriaville 2 x HPS 7507 b.d. 22% s.m. osad nadmierny – mleczarnia
Włochy Milano HPS 6007 600`000 28-32% s.m. osad komunalny nadmierny
Włochy Conza HPS 3007 nie dotyczy 34-40% s.m. odwadnianie wód popłucznych – SUW

Wastewater treatment plant in Puławy

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Wastewater treatment plant in Puławy  – delivery of one piston Bucher press capacity of daily 5 tons of dry solid per day (180 m3 feed) with polymer preparation station, measuring system and automation control. In the task Proffico realized a complete, high-performance installation of the mechanical dewatering of sludge, which allowed significant lowering of the cost of consumption in the process of thermal drying. Installation in Pulawy in Poland was the first installation of the mechanical dewatering of municipal sludge with the use of known and used in Western Europe press piston. The use of energy efficient Bucher press piston together with the measuring devices (dry solids, flow rate in input, flocculant consumption) results in a maximum physically possible level of sludge dewatering prior to drying. Thanks to the application of the presses Bucher HPS type 7507 energy consumption of the dryer has been reduced by 40%.

Wastewater treatment plant in Radom

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Wastewater treatment plant in Radom – delivery of two Bucher piston presses capacity of daily 15 tons of dry solid per day (360 m3 feed) with polymer preparation stations, measuring systems and automation control. In the task Proffico realized a complete, high-performance installation of the mechanical dewatering of sludge, which allowed significant lowering of the cost of consumption in the process of thermal drying. The use of energy efficient Bucher press piston together with the measuring devices (dry solids, flow rate in input, flocculant consumption) results in a maximum physically possible level of sludge dewatering prior to drying. Thanks to the application of the presses Bucher HPS type 7507 energy consumption of the dryer has been reduced by 40%.

PHOTOS