GTS PROJECTS's SEWAGE TREATMENT PLANTS - FREQUENTLY ASKED QUESTIONS (FAQ)
GTS PROJECTS’S Sewage
Treatment Plants
FREQUENTLY ASKED
QUESTIONS (FAQ) :
www.gtsprojects.in
What is Sewage?
Sewage is the wastewater that generated by human beings for their
domestic use (toilet, bath, canteen, laundry)
How much Sewage is generated in a residential complex?
The quantity of sewage consumed is estimated as 135 – 200 litters
per day per person residing. The total quantity (No. of persons residing X 135
-200 litres) has to be treated in STP within the premises.
What are the constituents of sewage ?
The constituents of sewage will be measured in terms of the
following parameters…
PH, BOD, COD, TSS, Oil& Grease, Free Coliform, TDS, NH4-
N, Total N
How the Sewage is treated?
By removing Coarse materials, Oil & Grease, Grits and primary
Sludges by Primary treatment, Organic matters by Secondary Biological
Decomposition and the Traces of Suspended solids by Sabd filters and carbon
filters and further Disinfected and Discharged.
Why should Sewage to be treated?
The toilet
wastewater and canteen wastewater and hand washing wastewater are generally
called as sewage. This has total suspended solids, oil &grease, organic
matters (like BOD and COD) more than the allowable limits. If we discharge the
waste without any treatment to the ground or any water sources it will pollute
the environment. So the sewage has to be treated prior to discharge to the
environment to remove the excess organic matter and suspended matters present.
How can treated sewage be re-used/re-cycled ?
The treated sewage water’s quality parameters will be less
than the statutory Limits. So the treated water will be discharged for
Gardening purposes or further the treated sewage will be purified in UF system
and/or RO plant and the purified water will be utilised for Toilet flushing and
other industrial purposes.
What are
all the Technologies / Treatment Systems available for Sewage Treatment?
Primary
treatment: Bar screen mechanism, Oil
Separator mechanism, Grit removal mechanism, Primary clarifier Raker arm
mechanism
Secondary Treatment :
Biological Treatment known as Activated Sludge process. Suspended growth
Process, Moving bed Biological Contactor (MBBR), SBR (Sequential Batch
Reactor), MBR (Membrane Bio Reactor)
Disinfection: by Hypo dosing
or Ozonation
Tertiary Treatment
Granular medium filter,
Micron filters, Ultra Filtration Systems, Reverse Osmosis plants
What are
the problems / troubles occurred in a Running STP and What are the Solutions /Remedies
|
problems / troubles occurred in a Running STP |
Solutions /Remedies |
|
BAD ODOUR in STP Area |
Odour will be eliminated by ensuring
Successful biological oxidation of
Sewage |
|
Treated Sewage water Not Looking Clear |
Ensure the biological decomposition of
Organic matters, ensure Disinfection and Filtration. |
|
Activated sludge (MLSS) settling is poor in Clarifier
|
Ensure proper concentration of MLSS in
Aeration Tank. |
|
Sludge coming upwards (sludge bulking) in the
Clarifier |
Contact us (www.gtsprojects.in),
(+91
9843030427) directly for further advices to get rid of the problem |
|
Treated water quality doesn’t meet the
Pollution control board Guidelines. Some values like BOD, COD,TSS are higher
than the Permissible limits |
Contact us (www.gtsprojects.in),
(+91
9843030427) directly for further advices to get rid of the problem. |
|
Sludge handling problem in STP |
Contact us (www.gtsprojects.in),
(+91
9843030427) directly for further advices how to handle the sludge and to make
the operators effective to handle in easiest way to dispose the sludge |
|
Noise in blowers |
Sound Attenuator for blower |
What is
meant by MLSS?
Mixed liquor suspended solids (MLSS) is the concentration of
suspended solids that id Activated sludge, in the Bio reactor (aeration tank)
during biological oxidation process. Its parameter is measured in milligram per
litre (mg/L) or ppm.
What of meant by Activated Sludge process, Sludge Recirculation,
FM Ratio?
The
biological Treatment system having an aeration tank followed with a settling
tank and a Sludge Recirculation of settled sludge in settling tank (secondary
clarifier) back to aeration tank is known as Activated Sludge Process.
Ratio between
the concentration of Organic matters (BOD,COD,TSS) present in the Aeration tank
and the concentration of mixed liquor suspended solids (MLSS nothing but
micro-organisms)
What is the operating cost of STP?
OPERATING COST OF STP = 1.5 PAISA TO 3 PAISA PER LIT OF
SEWAGE TO BE TREATED.
What are the Parameters of Treated Sewage Water Discharge
Standards of CPCB?
|
Parameters |
Parameters
limit (Standards for New STPs design after notification date) |
|
PH |
6.5-9.0 |
|
Total
Suspended Solids (mg/lit) |
Not
more than 20 |
|
Total
Dissolved Solids (mg/lit) |
Not
more than 2100 |
|
Biological
Oxygen Demand (mg/lit) |
Not
more than 10 |
|
Chemical
Oxygen Demand (mg/lit) |
Not
more than 50 |
|
NH4-N
(mg/lit) |
Not
more than 5 |
|
N –
total (mg/lit) |
Not
more than 10 |
|
Fecal
Coliform (MPN/100ml) |
Less
than 100 |
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