This document compares centralized and decentralized sewage treatment systems and promotes decentralized treatment using Sintex package sewage treatment plants (PSTP). Some key points: - Centralized systems have high costs for collection and conveyance of sewage over long distances, require pumping, and energy. - Decentralized/modular systems like Sintex PSTPs are compact, simple to operate, require minimal land and energy, and have lower operating costs. They are suitable for small colonies/sectors. - Sintex PSTPs meet CPCB treatment norms efficiently and are underground, requiring minimal footprint compared to other package plants. Hundreds have been installed across India for treating sewage.

1. BEST SOLUTION FOR SEWAGE
TREATMENT
First Time in India by
M/s. Sintex Industries Ltd.

2. Centralized Plant
 Management system of any city
consists of collection, treatment
and disposal.
 About 80% of the cost goes for
collection & conveyance which is
very high.
 Depth of sewer increases with
increase of length of sewer
line.
 Pumping of sewage at the
intermediate and terminal
points requires a lot of energy.
 Very large volume of sewage &
also distance of conveyance, to
the STP which are generally
located outside of the cities, is
long.
Decentralized Plant
 Applicable to small colony wise /
sector-wise treatment system.
 Cost of conveyance of sewage is
minimal.
 Responsibility of construction as well
as O & M may be taken up by the
residential colonies, builders-
developers.
 Compact Package plant is simple to
operate.
 Mostly based on gravity and requires
very less energy.
 Requires minimal maintenance, land
& consumables for reducing operating
cost.
COMPARISON BETWEEN CENTRALIZED AND DEWATS

3. BEST WAY TO MEET CPCB NORMS – ‘SINTEX’ PSTP
•Environmental Impact Assessment (EIA) norms all over the country demands
treatment of sewage at site wherever central sewage plants are not available.
• Sintex’ Package Sewage Treatment Plants (PSTP) have proved to be one of the
best for meeting these norms in the most efficient manner.
•Sintex’ PSTP is based on anaerobic and aerobic treatment (Johkashou – Japanese
technology) and are required to be installed underground thus, overall footprint of
these plants is the lowest compared to MS/FRP package plants.
• Sintex have completed Hundreds of installation all across the country and
recycling sewage treated water for gardening, landscaping in large complexes,
institutions, malls, industries, housing colonies, educational complexes, hostels,
hotels, resorts etc.

4. PSTP –
Package
Sewage
Treatment
Plant (NBF)
NBF -10 KLD to
NBF-50 KLD
housed in one
FRP tank
NBF -60 KLD to
NBF-120 KLD
housed in two
FRP tank
NBF -130 KLD
to NBF-150 KLD
housed in three
FRP tank
PWTS – AM
Septic Tank &
PWTS-STBF
Treatment Plant
Available From
1200 L to 6000 L
THST
&
CCST
Septic Tank
THST available
in 1000 L ,
2000 L
CCST available
from 1000 L to
5000 L
AST –
Anaerobic
Septic Tank
AST -10 KLD to
AST-50 KLD
housed in one
tank
AST -60 KLD to
AST-120 KLD
housed in two
tank
AST -130 KLD to
AST-150 KLD
housed in three
tank
SINTEX’S SOLUTIONS

5. PWTS-STBF SERIES
SEWAGE TREATMENT PLANT
It is a compact, modular Polyethylene tank which can be used in a
decentralized manner anywhere for Sewage treatment for Domestic
and semi commercial places

6. The technical specification of the Japanese blowers are as below
Model Unit HP-20 HP-40
Rated Voltage V AC-230 AC-230
Power Supply frequency Hz 50 50
Normal operation Pressure K/a 9.8 9.8
Exhaust air flow rate L/min 20 40
Power Consumption W 17 38
Noise level DBA (1m) 31 32
Weight kg 3.2 3.2
Capacity of STP Ltr. 1200 1600 - 2000
PWTS-STBF SERIES
SEWAGE TREATMENT PLANT

7. DURING INSTALLATION AFTER INSTALLATION
PWTS-STBF SERIES
SEWAGE TREATMENT PLANT

8. PSTP-NBF
Package Sewage Treatment Plant
In Collaboration with
M/s. Aqua Nishihara Corporation, Japan.

9. Sr. No. Prefabricated Sintex FRP-PSTP R.C.C./ MSFRP - Conventional STP
1 Consistent efficiency throughout the year. Seasonal variation is observed .
2 No monitoring of MLSS & FM ratio Constant monitoring of MLSS is required.
3
Sludge handling required once in 1-2
years.
Sludge handling once in 15 days
4 Skilled supervision not required. Continuous skilled monitoring required.
5
60% electrical saving compared to
conventional STP
It consumes higher electricity than Sintex STP
6 Aesthetic appearance is very good There is a nuisance of foul smell and flies
7
leak proof, no root integration and no
fungal growth
Possible in Conventional STP
8 Installation lead time within a week Construction work takes around six months
9 It can be upgraded and relocated. No such scope available
10 FRP tank life more than 50 years. Life less than 20 year
COMPARISON TABLE OF SINTEX PSTP V/S CONVENTIONAL STP

10. Salient Features of
PSTP-NBF System
 Capacity is from 10 KLD to 150 KLD.
 The system can be kept in series or parallel as per the availability of land.
LPCD – Liter per capita per day

11. INSTALLATION OF
PSTP-NBF System
150 mm PCC Lowering of deadmen
Filling with gravel size 4.5 to 12.5 mm

12. Refilling of trench
INSTALLATION OF
PSTP-NBF System
Unloading of the System
Piping Work Blowers in room

13. Triple Benefit to clients
• As the system goes underground above space can
be used for gardening purpose or as parking lot.
Land saving
• As the system is odor free a children park can be
there on top of the system.
Beautification
• Individual responsibilities can be easily given to the
owners of the scheme.
Responsibility