south-pest wastewater treatment plant · 2013-03-04 · plant characteristics the south-pest...
TRANSCRIPT
OPENING THE SITE TO THE PUBLIC
The wastewater treatment plant is open
to any interested person. As the biggest
environmental service provider of the
country, we consider it being important, that
interested persons have the possibility to
get closer to our activities. Furthermore, we
pay special attention to the environment-
focused education of the growing up
generation. After prior notice our experts
are at the disposal of visitor groups.
Budapest Sewage Works Pte Ltd.South-Pest Wastewater Treatment Plant
Address: H-1238 Budapest, Meddőhányó str. 1.Telephone: +36 1 284-4339E-mail: [email protected]: www.fcsm.hu
South-Pest Wastewater
Treatment Plant
The location of the fi rst wastewater treatment plant of Hungary was
determined by the National Planning Offi ce on December 23, 1952.
The plant was designed to treat the wastewaters of Pesterzsébet, Kispest
and Pestlőrinc, despite multiple modifi cations of the investment plan,
it was constructed without interruption and has been in full operation
since September 14, 1966. Sludge treatment was added in 1967.
The extension of the plant continued in the 80’s and now it is the most
modern wastewater treatment plant of Hungary.
Key developments:• In 1983, the hydraulic capacity of the plant was extended by
two additional parallel basins.
• In the middle of the decade, the automated dewatering of
the sludge, generated in anaerobic mesophilic digesters,
started.
• In 1986 surface aeration was replaced with the more effi cient
fi ne bubble aeration technology.
• From 1989, biogas exploitation was started; the energy
produced by the gas engines ensures the operation of the air
blowers of the activated sludge system.
• In 1990, biological phosphorus removal was achieved by
upgrading the aeration unit.
• In 1992 the hydraulic capacity was further expanded, when the
new mechanical pre-treatment unit was built, also ensuring
removal of grease and sand from the effl uents.
• In 1997 new shareholders (the French Veolia Water and the
German Berlinwasser) invested in the Budapest Sewage Works
Pte Ltd., which resulted in a signifi cant quality development at the
South-Pest plant, too. The wastewater treatment and the sludge
treatment sections were renewed and complemented.
• In 1999 the plant became capable of the full biological treatment
of 80 thousand m3 wastewater per day, also including the
two-stage nitrogen and phosphorus removal.
• In 2001, the sludge treatment process was renewed and
extended: a new covered gravity thickener equipped with a
biofi lter for odor removal was built, the centrifuges serving the
automated sludge dewatering were put in operation, the gas
engine producing electric energy from the produced biogas,
and the biogas desulphurization unit were also started up.
• In 2005 the high nutrient containing waste receiving station
was handed over and the biggest thermophilic sludge digester
of our country, as well as an additional high capacity biogas
engine started operating.
• In 2007 the capacity of the activated sludge pools’ aerators
was upgraded, a new aeration unit began operating, and the
sludge silo for the temporary storage of dewatered wastewater
sludge was built.
• In 2009 a piece of equipment for separating thready materials,
and a new heat exchanging engine house started operating,
an industrial pilot-scale digester was presented.
• In 2012 the structure receiving incoming wastewaters was fully
covered. Biofi lters operate in order to prevent odors, which
neutralize 100 thousand m³ of odorous air per hour.
• The Organica® Food Chain Reactor (FCR) was also handed
over in 2012, which can be regarded as a breakthrough in
wastewater treatment.
• In 2012 the previous chlorinating solution serving the disinfection
of the treated effl uents from the plant was replaced by the much
safer and more environmentally friendly UV disinfection..
PLANT HISTORY
2013.
PLANT CHARACTERISTICS
The South-Pest Wastewater Treatment Plant operates with the most
modern and most environmentally friendly technology. It continuously
receives and treats the wastewaters of about 300 thousand inhabitants
of Pestlőrinc, Kispest, Erzsébet and Soroksár (18th, 19th, 20th, 23rd
districts), and of the companies operating there.
Quantitative parameters
The plant area is 17 hectares, the number of employees in head
count exceeds 70.
Quantity of treated wastewaterThe wastewater treatment capacity of the plant is 80 thousand m3 per
day, 22 million m3 per year. On average 53 thousand m3 wastewater
arrives from the four districts of South-Pest per day.
Quantity of wastewater sludge producedOne of the side products of wastewater treatment is dewatered
sludge, the amount of which at the plant is 27.5 thousand tons per
year. Electrical and thermal energy is generated from the 5.9 million
m3 biogas produced every year from the anaerobic sludge processing,
which covers almost all the energy needs of the plant.
The quantity of the produced technological wasteThe quantity of the non-organic waste produced during wastewater
treatment reaches 700 m3 per year.
Quality parameters
The plant• as a result of the multiple step mechanical and biological wastewater
treatment also combined with the living machine technology, the quality
of the treated water discharged into the Ráckeve-Soroksár Danube
branch is better than the parameters defi ned in the EU regulations;
• ensures the environmentally friendly treatment of the side products
of wastewater treatment, such as sludge and mechanically removed
pollutants as well as their preparation for storing in landfills and recycling;
• treats the delivered waste containing organic compounds and
transforms it into green energy;
• is practically self-suffi cient since nearly 90% of its electric energy
demand, and 100% of its heat energy demand is produced from
sewage sludge and organic wastes;
• removes odors from the air produced during the technological
processes.
Experimental and training baseInnovative physical, chemical and biological pilot-scale experiments are
conducted at the wastewater treatment plant. The experiments ensure
the monitoring and the continuous development of the technological
processes.
The wastewater treatment plant plays an important role in the forth-going
training of specialists and in the practical education of students.
State-of-the art technology and equipmentThe French and German shareholders considerably contributed to the
modernization of the plant. Their experience in operating treatment
plants and their technical know-how enabled the signifi cant renewal
of the plant and the completion of the technological processes.
The biological fi lters were set up with French technology and German
equipment; the gas engines are German products, whilst the organic
waste receiving and treatment station, as well as the thermophilic
digester unit operate with French technology.
The treatment plant uses not only the traditional two-stage biological
fi ltering, but it also increased treatment effi ciency with the help of live
plants and the artifi cial root system, due to a Hungarian development,
the Organica® Food Chain Reactor (FCR), thus the quality of the
treated water discharged into the receiving Ráckeve-Soroksár
Danube branch exceeds the European standards.
Now the plant combines the most modern international and national
knowledge of wastewater treatment, and it is at the forefront in
Europe with regard to its technology, its equipment and its cleaning
completeness.
Parameters of infl uents and effl uents (2012)
Parameters of infl uents
(mg/l)
Parameters of effl uents
(mg/l)
Limit values
(mg/l)
Chemical oxygen demand (COD) 733 30 50
Biological oxygen demand (BOD5) 446 10 25
NH4
+-N 61 1,8 2
Total phosphorous 9 0,2 1,8
Total suspended matter 255 3 35
EQUIPMENT OF THE TREATMENT PLANT AND THEIR OPERATION
Raw
wastewater
Fine screen
Grid waste
Sand collector
floating matters
Gravity
thickener
Polyelectrolite
addition (A)
Deodorizing
biofilter
Sludge gravity
thickening filter table
Liquid and
solid waste
(Waste
receiving
station)
Contaminated air
Mechanical treatment Biological treatment Sludge treatment
Deodorizing biofilter
Backwash water
Polyelectrolite
addition (B)
Dewatering
centrifuge
Desulpherization units
Gas boilers
Gas enginesThermal energy
Dewatered
sludge
Thermal energy
Gas tank
Gas flair
Electric energy
Sand collector
sediments
Aerated sand trap
Aeration
Primary(raw) sludge
Primary clarifier
Iron(III)-chloride proportioning
Anoxic
zoneAerobic
zone Secondary clarifier
Air addition
Sludge recirculation
Excess activated sludge
AerationNitrate content wastewater+biofilter
backwash water recirculation
Nitrification
biofilterDenitrification
biofilter
Methanol dosing
UV disinfection
Treated
wastewater
Anaerobic
thermophilic
digester
Anaerobic
mezophilic
digester
Post-digester
Silo for sludge
Pasteurization equipment
2d
1 2a 2b 2c
4c
6
5b
5a
13
12
141098
19
18
17
4b
3
4a
15
20
7
4a
4a
3
3
4c4c
4c4c
4c
11b
11a
16
2e
Mechanical treatment phase
Biological treatment phase
Sludge treatment
Technological waste treatment
Other structures
Biological treatment
4. First stage combined with Organica® Organica Food Chain Reactor (FCR) technology (transformation and
removal of chemical contaminants)
a. In the activated basins covered with greenhouses
microorganisms biodegrade the dissolved organic
content of the wastewater by means of oxygen.
The roots of the plants planted on the surface of the
water reaching 0.5-1.5 meter deep and the artifi cial
biofi lm carriers placed in the basins provide excellent
habitat (complex ecosystem) for the 2-3000 kinds of
microorganisms degrading organic matters and for
other higher living beings. With the increasing number
of microorganisms in the system treatment effi ciency
also increases.
• In the anoxic zone, the oxygen source is nitrate
(predenitrifi cation);
• In the aerated zone, the oxygen is supplied by
compressed air from the blower station and a fi ne
bubble aeration system;
• Phosphate present in the wastewater is removed
by dosing an iron(III)-salt solution, which forms a
precipitate of ferric phosphate.
During the degradation processes, sludge rich in
microorganisms is generated.
b. The air blowers ensure the oxygen need of the biological
process.
c. The suspension of activated sludge and water is
separated in the secondary clarifi ers. The sludge fl ocks
settle out by gravity and are collected at the bottom of
the clarifi ers. The collected sludge is partially recycled
to the aeration basins, whilst the excess sludge is
discharged to the sludge treatment facilities.
The wastewater cleaning technology
Wastewater and rainwater reach the South-Pest plant through the
main collector of Torontál street. Due to the favorable topographical
parameters of the water collection area, the wastewater can be routed
from the main collector to the wastewater treatment plant by gravity.
A concrete defl ecting wall, built in the main collector, directs the
water from the main collector into the upper rainwater separator.
The wastewater is routed to the grit collecting and separating basin
via steel pipe located under the Budapest-Kelebia train line.
Mechanical treatment
1. Grit collecting and separating basin Coarse material such as gravel and other bigger size
pollutants are removed in this unit.
2. Covered mechanical pre-treatmenta. Automatically operating screens remove fl oating pollutants
exceeding 10 mm in size.
b. In the aerated sand and fat collector, non-organic matters
(sand, small gravels) are settled out and are removed from
the bottom of the basin by means of a scraper. The fat
and oil-like fl oating materials are collected in a sump and
discharged into the digesters.
c. The separator divides the mechanically cleaned water
into three parts depending on the actual capacity of the
biological treatment lines.
d. The rain collection basins are fi lled in case of heavy
precipitations and they serve as buffers.
e. The integrated biofi lter neutralizes 100 thousand m³ of
odorous air per hour thus signifi cantly reducing odors.
3. Primary clarifi ers The fi ne fractions of non-organic and settling matters remaining
in the wastewater are separated here. The accrued sludge is
pumped to the sludge treatment facilities.
5. Second grade (double stage fi xed bed biofi lters)
a. In the nitrifi cation fi lters, the microorganisms attached to
the fi lter material oxidize the ammonium content of the
wastewater to nitrate while the fi lters are aerated.
b. In the denitrifi cation fi lters, the microorganisms attached to
the fi lter material reduce the nitrate contained in the water,
coming out of the nitrifi cation fi lters, under anoxic conditions
to elementary nitrogen. As complementary nutrient, methanol
is applied for the biological process. During the processes
described above excess sludge is formed on the fi lter
material. This is removed by regular back washing of the
fi lters in order to prevent blockages.
6. The treated wastewater fl ows through the UV disinfection
into the Ráckeve-Soroksár Danube branch.
The sludge and waste treatment technology
The sludge separated in the primary clarifi ers and the excess
sludge of the biological processes is discharged into the
sludge treatment unit.
7. Covered gravity thickener The fi rst step of the sludge treatment. As a result of the
gravitational force the thickening sludge is further processed.
The produced water is routed back to the beginning of the
wastewater treatment technology. The air withdrawn from
the thickening units is treated in biofi lters.
8. Automatic sludge thickening and dewatering unit Automized centrifuges serve the dewatering of the
sludge coming from the digesters. As a dewatering aid a
polyelectrolyte is dosed to the sludge.
9. Silo for storing dewatered wastewater sludge It serves as temporary storage for dewatered wastewater sludge,
the sludge-transporting trucks are loaded with sludge from here.
10. Waste receiving and processing station The reception of waste with high nutrient content and its
homogenization prior to thermophilic digestion takes place here.
11. Sludge digesters The process takes place at two different temperatures, under
anaerobic conditions, and with the help of microorganisms.
a. Mesophilic digestion (at 37 oC)
b. Thermophilic digestion (at 55 oC)
12. Biofi lter It cleans and deodorizes the odorous air produced in the
waste receiving station and in the sludge dewatering building
by means of bacteria.
13. Gas engine generator units The biogas produced during sludge digestion is burnt in biogas
engines, thereby producing electric and thermal energy.
14. Biogas storage tank It serves the harmonization of biogas production and
consumption.
The treatment of technological waste
15. Technological waste transfer station It receives the waste collected at the various sites of the Company
and the sludge originating from rain trap cleaning. Following
disinfections and compaction, the materials are transferred to
containers and transported to landfi lls. An automized septic
receiving station operates at the same location.
Other structures
16. Central machinery.
17. Maintenance workshop.
18. Offi ce buildings.
19. Laboratory (factory control).
20. Porter’s service, entrance of the plant.