rbc technique By avinash kumar jha Downloaded from CivilDigitalcom introduction The rotating biological contactor RBC is a fixed film biological secondary treatment device In ID: 404505
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Slide1
Sewage treatment plant based on rbc technique
By :avinash kumar jha
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Slide2
introductionThe rotating biological contactor (RBC) is a fixed film biological secondary treatment device
.In operation, a media, consisting of a series of circular disks mounted side by side on a common shaft is rotated through the wastewater
flow.
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Slide3
Structure of rbc
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Slide4
Working of rbc
The shaft continually rotates at 2 to 8 rpm, and a layer of biological growth 2 to 4 mm thick is soon established on the wetted surface of each disk.
The disk continues to rotate, leaving the wastewater and moving through the air. During this time, oxygen is transferred from the air to the slime. As the slime
reenters
the wastewater, excess solids and waste products are stripped off the media as sloughings.
These sloughings are transported with the wastewater flow
to
a settling tank for removal.
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Inference during operationDuring operation, observations of the RBC movement, slime
color, and appearance are helpful in determining system performance; that is, they can indicate process conditions. If the unit is covered, observations are usually limited to that portion of the media that can be viewed through the access door.
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Slide7
Observations during operation
The following may be observedGray
,
shaggy slime growth - indicates normal operation
Reddish brown, golden shaggy growth - nitrification
White chalky appearance - high
sulfur
concentrations
No slime - severe temperature or pH changes
Ref:
Treatment of Municipal Wastewater by using Rotating
BiologicalContractors
(
Rbc’s
)
Prashant
A.Kadu, Amruta A.Badge, Dr.Y.R.M.Rao ( ajer )
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Slide8
Organic and nitrogen removal in rbc
First day cod level remains low in the effluent but after a period of 75-100 days effluent quality start deteriorating as a result of washout of detached biomass.Some bacteria like pseudomonas removed from fixed film system as they do not stick on the film .
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Slide9
Performance of RBC in COD and NH4-N removal
in aerobic unit cod removal affected by the hydraulic loading .it firstly decrease upto a
certain level as shown :
intense separation
of the
attached biomass occurred contributing to
high effluent
COD values, and the low removal efficiency
was the
result of
biosolids
escape rather than inadequacy of
the
unit at this high
loading
Nitrification efficiency firstly increase and then becomes constant
Ref:
Organic
and nitrogen removal
rotating biological contactor
treating municipal wastewater
Demetrios N. Hiras, Ioannis D. Manariotis, Sotirios G.
Grigoropoulos
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Slide10
Nitrification and de-nitrification
Nitrification-De-nitrification is one of the most widely accepted biological solutions
to
the
problem
of nitrogen removal from high strength nitrogenous
wastewaters due to its efficiency and economy.
Nitrification
is a two step sequential
aerobic
oxidative
pathway
for
the
oxidation
of ammonia to nitrate
,
resulting
in release of energy.The reaction is carried out by autotrophic bacteria belonging to the genera Nitrosomonas (oxidizing ammonia to nitrite) and
Nitrobacter
(oxidising
nitrite to nitrate
).
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Slide11
Nitrification and de-nitrification De-nitrification is
an anoxic\anaerobic reductive pathway for the conversion of nitrate to nitrogen gas
.
This
reaction
is carried out by bacteria belonging to genera Bacillus, Pseudomonas,
Achromobacter
,
Micrococcus,
etc
However simultaneous
nitrification- aerobic
de-nitrification system
in a single stage using
a
mixed biofilm culture of
Thiosphaera
pantotropha
can also be used. thus eliminating the requirement of a separate anoxic reactor for de-nitrification.
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Slide12
Efficiency of nitrification and de-nitrification
On the basis of hrt : removal efficiency increase with increase of hrtOn the basis of surface loading : removal efficiency decrease with increase surface loading
The pH was maintained between 7.8-8.5 which
is in
optimum for both nitrification
and denitrification
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Slide13
Ref: journal on
Simultaneous nitrification
‐
de-nitrification
in a rotating biological
contactor by
Mr.
S.K
.
Gupta,
S.M.
Raja &
A.B.
Gupta
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Slide14
Decolourization in rbc
coloured industrial effluents can be effectively treated by immobilized
Phanerochaete
chrysosporium
in a continuously operated RBC reactor following its dilution with media containing nutrients and sugar, preferably glucose
.
COD
removal
efficiencies in
the various stages of operation in the reactor were also
found to
match well with the decolourization of the
wastewater
ref: Continuous treatment of coloured industry wastewater in
a rotating biological contactor
reactor
Kannan
Pakshirajan ,Sumeet Kheria
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Slide15
Applicability Rbc
can achieve a high removal of biodegradable organic waste from domestic black or grey water as well as from industrial waste water as from dye industryIt has been observed that the organic removal is decreased significantly if organic loading in more than 5 and full nitrification can be achieved when the hydraulic loading is less than 5
gmbod/m2.day .
so to get maximum application the loading should be in some limits.
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Advantages of rbc unit
Short contact period are required due to large active surface area.Capable of handling of wide range of flows.Sludge has good settling characteristics.
Low power required.
Simple in operation and maintenance
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Slide17
Disadvantages
Requirement for covering rbc unit to prevent algea growth and freezing in northern part of India.
Shaft bearing and mechanical drive units require frequent maintenance.
Continuous supply of electricity required.
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Slide18
references
Treatment of municipal waste water using rotating biological contactor By prashant
a
kadu
,
amruta a badgeOrganic and nitrogen removal in a two-stage rotating biological contactor treating municipal wastewater
by : Demetrios N. Hiras, Ioannis D. Manariotis, Sotirios G. Grigoropoulos
Simultaneous nitrification‐
denitrification
in a rotating biological contactor
by : S.K. Gupta , S.M. Raja & A.B. Gupta
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Slide19
references
A performance evaluation of a full scale rotating biological contactor (RBC) system by : M.Y. Norouzian & S. Gonzalez-Martinez
Effect of operating parameters on
denitrification
in ananoxic rotating biological contactor
by : Susana
Cortez
Pilar
Teixeira
Rosário
Oliveira
&
Manuel
Mota
Continuous treatment of coloured industry wastewater using immobilized Phanerochaete chrysosporium in a rotating biological contactor reactor by: Kannan Pakshirajan, Sumeet Kheria
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Slide20
Thank you