This document presents a proposal for decentralized wastewater treatment in urban and rural areas. It discusses the increasing demand for water due to population growth and the opportunity to reuse 80% of water that becomes wastewater. The objectives are to study current sewage treatment, project future population and water demand, and design decentralized wastewater treatment plants. Calculations project Delhi's population to reach 28.6 million by 2025, increasing wastewater generation. The expected outcomes are analyzing the current sewage system and designing low-cost, low-energy decentralized plants suitable for any community. The conclusion is that decentralized plants providing reuse and recycling are more feasible than large centralized plants.

1. A
PRESENTATION
ON
DECENTRALISED TREATMENT OF WASTE
WATER
A remedy and solution for urban and rural localities
In the expert guidance of:
SRIDHAR PABBARAJU
Chief operating officer
Intergen energy pvt, ltd Gurgaon
Under the supervision of :
Dr.RICHA K.TYAGI
Assistant professor
BBA Central University -Lucknow
Work carried by :
RAJNEESH KUMAR GAUTAM
M-Tech Energy and Environment
BBA Central University -Lucknow

2. CONTENTS
1.Introduction
2.Objective
3.Proposed work
4.Targets achieved
5.Expected outcome
6.Conclusion

3. INTRODUCTION
The need of water is directly proportional to the population, as there is
exponential growth in population in city like Delhi the need of water is
also becoming a serious concern . To meet the Demand there must be
some initiative to be taken as the available water is limited and the
exploitation of water is increasing day by day.
Though the water use can
be controlled to a some extent but for city with exponential growth rate it
is not feasible as large quantity of water is required for variety of works
viz. domestic, commercial, industrial ,institutional etc.
The concept of water reuse and recycle may be a solution for such
problem. It is calculated by CPHEEO that 80% of water turns as waste
water. It this waste water can be recycled and reused then it can be used
for various purposes like-

4. 1.) Toilet flushing
2.) Car washing
3.)Can be used in chillers where huge amount of water is required
4.) Gardening
5.) Fishing
6.) Horticulture
As using the decentralized waste water treatment facilities not only
recycle and reuse the waste water but also prevent the freshly available
ground water.

5. OBJECTIVES
1.) To study the status of current sewage treatment status of Delhi based
NCR region and estimating the quantity of sewage discharged into
Yamuna.
2.) Projection of the current population and calculating the water demand
and supply deficit, thereby calculating the sewage generation over an
projected period of 10 years from present i.e. 2025
3.) Designing of decentralized waste water treatment plants that can be
adopted by communities in order to prevent the over-exploitation of the
ground water and providing a efficient sewage treatment facility.

6. CALCULATION OF SEWERAGE AND WATER AVAILABILITY
FROM 2004-2025
ALL VOL IN
MLD
2004 2005 2006 2011 2015 2021 2025
population 16753235 18300000 23000000 28600000
Total water
demand
2685 3763 4090 5181 5436 6275 7014
Total net
water supply
2265 2362 2461 3773 3696 5259 6312
Waste water
generated
2148 3010 3272 4144 4348 5017 5611
Waste water
treated at
CETP
200 217 234 346 649 755 ------
Proportion
not sewered
14% 13% 13% 10% 5% 5% 5%
Outside
sewered area
254 302 302 294 281 ------
Net w.w
generated
1358 1722 1798 2218 3201 3242 ------
infiltration 518 518 518 518 518 518 518
Gross w.w to
treatment
1876 2240 2316 2376 3719 3760 4500apx

7. 2001 (138.51 Lakhs) 2011 (167.53 Lakhs)
EXPECTED POPULATION TO REACH BY (190 LAKHS) BY 2017
EXPECTED POPULATION INCREASE BY 24 Million BY 2021 (U.N)
PROJECTED POPULATION FOR 2025 (28.6 Million)
(NOTE: THE POPULATION HAS BEEN PROJECTED BY VARIOUS METHODS PRESCRIBED
BY CPHEEO MANUAL)
POPULATION PROJECTION FOR 2025

9. EXPECTED OUTCOME
The current status of the sewerage system has been studied and analyzed. The
population has been projected for a period of 10 years i.e. 2025. The sewage
treatment in Delhi is not up to the mark as the total sewage treatment is found
to be 57% only and the rest of the sewage is dumped into Yamuna by partial
treatment or without any treatment .
Various methods are implemented for calculating and modeling of population
like mathematical method and software’s like PDE population module has been
used.
The objectives are been carried under the supervision of the experts in the field
of the sewage treatment and various public agencies like Delhi jal board and
Centre for Science and Environment are helpful for the fulfillment of the
objectives prescribed.
The designing of the decentralized sewage treatment system require low
energy ,low cost and less skilled techniques and is suitable for any community,
industry and institution. This objective will be completed by may of 2015.

10. CONCLUSION
In India 38255 MLD of sewage is generated out of which the
capacity of treatment is 11788 MLD, out of the treatment capacity
the actual treatment is only 22% (8251) and the rest about 70%
of the sewage is dumped directly in the river bodies without
treatment or after partial treatment.
If the government built STP for
70% of the sewage generated it would cost around 26500-105868
Crore Rs (Excreta matters 2012). It is therefore not feasible to
invest such huge amount of money as the centralized plants
needs to be connected by Sewer lines which is again very much
costly. The concept of RECYCLE AND REUSE can be
implemented by decentralized plants which are cheap, cost
effective and easy in construction in least available resources and
having high efficiency of treatment.