dgl part-3_0 DRAINAGE SYSTEM.pdf

7/27/2019 dgl part-3_0 DRAINAGE SYSTEM.pdf

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EA for the Proposed STP

Dindigul Municipality Pure Enviro9

2. PROJECT DESCRIPTION

2.1 PROJECT BACKGROUND

There is no sewerage system existing in Dindigul town. Sewage disposal is primarily

through septic tanks. In general, it is discharged in to the open street drains. Some soak pits of

shallow depth and inadequate size are also in existence. These soak pits do not function properly

and thereby allowing the sullage overflows. The street drains carrying sullage and sewage, are

ultimately discharged in to water courses. Table 2.1 describes the salient features of the Dindigul

District.

The sewerage system will comprise of construction of 13.65 MLD Sewage Treatment Plant

of activated sludge process, laying of Trunk main sewer line diameter of 400 mm and 450 mm for a

length of 1.00 km and secondary/laterals for a length of 93.00 km in diameter ranging from 200 mm

to 500 mm. In the system one intermediate pumping station has also been proposed to pump about

4 MLD of sewage to be transported to a gravity sewer through a pumping main of diameter 350 mm

and a length of 650 metres. For house service connection it has been proposed 110 mm & 160 mm

diameter ODU PVC pipes (4 to 6 per manholes). The house service connection is provided

normally to the manholes, where 2 or 3 House Service Connections (HSC) will be to Road Side

Chamber (RSC) and RSCs will in turn be connected with manholes. Also provision has been made

in the cost estimate for dismantling cum refilling the septic tank / soak pit utilities for those who do

not find space for effecting a separate connection.The collection system is designed for the volume of waste water to be generated for the

projected population of 2023. Per capita wastewater generation is considered as 80% of the net

water supply. Peak factor has been considered to design the sewer lines.


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2.2 SALIENT FEATURES

Table 2.1 Salient Details

Feature Details

Site Location Pallapatti, Dindiugl Taluk, Tiruvallur District

Site Latitude and Longitude

Corner 1 N 10 21' 8.51" E 77 56' 43.717"

Corner 2 N 10 21' 6.455" E 77 56' 49.627"

Corner 3 N 10 20' 53.605" E 77 56' 41.532"

Corner 4 N 10 20' 52.064" E 77 56' 47.057"

Topography Plain

SOI Toposheet 66 C/8

Above Mean Sea level in m 262 m above mean sea level

Population of the project village 11834 as per 2001 Census

Name of Village Population (2001)

Sindalagundu 8869

Surrounding Villages (2 KmRadius)

Pillayarnattam 2092

Nearest City Dindigul 4.0 Km

Nearest Highway NH-5 0 Km,State highway eastern side of the project site

Nearest Railway line 6.0 Km

Nearest Railway station Dindigul 4.0 Km

Nearest Railway Junction 4 Km Dindigul

Nearest Air port 55 Km Madurai Air portNearest Forest Nil

Nearest Hill Ranges Nil

Nearest State / Taluk Boundary 9.8 Km Vedasandur Taluk

Coastal Boundary 160 Km

Ecological Sensitive areas(Wild life sanctuaries)

No Ecological Sensitive area with in 10 km radius

Name of Taluk

Dindigul (Part)

Vedasandur (Part)Number of villages within 2 kmradius

3 (Full and Part)


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2.3 PROJECT LOCATION

Location : Palapatti Village

Present Usage : Barren land

Area Available : 68.69 acres

STP Area Requirement : 1.89 acres

Total vacant area : 66.56 acres

Ownership : Dindigul Municipality

Dindigul is located at 10.35 N 77.95 E. It has an average elevation of 268 metres

(879 feet) MSL. The area is underlined by hard-rock and a drought-prone region. It is spread over

an area of about 14.01 Sq.Kmand is characterized by undulating topography with hills located inthe southern parts, sloping towards north and northwest. The highest elevation (altitude) in the hilly

area (Sirumalai Hill) is of the order of 1350 m MSL, whereas in the plains it ranges from 360 MSL in

the southern portions to 240 MSL in the northern part of the area. No perennial stream exists in the

area, except for short distance streams encompassing second- and third-order drainage. Run-off

from precipitation within the basin ends in small streams flowing towards the main river, Kodaganar.

2.4 PROJECT COST

The total project cost is estimated to be Rs.10.34 Crores (Detailed breakup is given in

Table 2.2) and the total operation and maintance cost is estimated to be 1.98 Crores (Detailed

breakup is given Table 2.3).


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Table 2.2 Project cost

S.No Details Amount(Rs.)

I

a.

Capital cost:

Submission and acceptance of detailed designs, drawings and estimates 20,00,000

b Hydraulic process design and layout of the plant 15,00,000

c Structural design and construction drawing for primary units 10,00,000

c Structural design and construction drawing for secondary units 15,00,000

d. Structural design and construction drawing for sludge handling, treatmentarrangements unit and auxiliary units.

15,00,000

II Submission and acceptance of detailed Environmental Assessment Report 8,00,000

III

1.

2.

3.

4.

5.

Construction of the following components of the plant

Receiving Chamber

Screening units

De-gritting units

Distribution box & Bye-pass arrangement

Primary and Secondary Units

38,00,000

48,00,000

55,00,000

49,00,000

3,85,00,000

6. Chlorination Tank 22,00,000

7. Sludge sump and Pump house 28,00,0008. Centrifuge House 67,00,000

9. Administrative Building including Furniture and Laboratory Equipments 55,00,000

10. Internal Roads, Pathways, Pavements, Storm water drainage 45,00,000

11. Misc. Civil works like Fencing / Entry Gate 21,00,000

12. Site Clearance, Disposal / Plot Development Landscaping etc., 8,49,400

13. Electrical works including (Bidder to specify various units) 1,29,00,000

IV. Implementation of EMP 50,600

Total (Rupees Ten Crore and Thirty Four Lakhs Only) 10,34,00,000


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OPERATION AND MAINTANCE COST:

Table 2.3 O & M Cost (5 years)

S.No Description Amount

(in Rs.)

1 Fixed cost (Man power, maintenance of allCivil Structures and entire plant HouseKeeping, all repairs including spares &Replacement, Oil & Grease cost)

10,570,000

2 Variable cost (except TNEB powercharges, Diesel cost, Chlorine Dosagecosts) other chemical consumable costand safe disposal grit / sludgetransportation to site

9,048,000

3 Greenbelt 47,200

4 Environmental Monitoring Plan duringOperation Phase

1,34,800

TOTAL (Rupees One Crore and Ninety EightLakhs Only)

1,98,00,000

2.5 MANPOWER

The STP will have the following employees for its operation. Table 2.4 shows the total

manpower requirement for Dindigul STP.

Table 2.4 Manpower

S.No Description Nos

1 Plant operator 2

2 Lab Chemist 1

3 Lab Assistant 1

4 Watchman / helper 25 Gardener / Farm Assistant 2


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2.6 TREATED WATER DISPOSAL SYSTEM

Treated effluent is pumped through R.C.C pipes (300mm) of grade NP-3 about 16

manholes run in of size 30 m with intervals of closed conduits. There will be no major ecological

impact due to laying of treated effluent discharge pipe line and the treated sewage will be disposed

in the Kodaganar River after meeting the standards.

2.7 DETAILS OF SLUDGE & METHOD OF DISPOSAL

Disposal body : Kodaganar River

Direction : West to STP plant

Disposal point : At Palam Rajakkam Patty,Palani Road

Distance from the STP : 5 km

Treated Sewage Collection Tank : 1

Pumping stations : 2

Pumping Main Km : 6.36 Km (RM Colony to Project site)

2.0 Km (Parapatti to Project site)

Pipe line routing : The treated effluent is discharged through RCC

pipe to the final disposal point located at Palam

Rajakkam via Ponmandurai road, Madurai road

(towards Trichy) and Palani road.

Figure 2.6Shows thePipe line routing

Impact due to pipe laying : There will be no major ecological impact due to

laying of treated effluent discharge pipe line.

Storage and Disposal of Biosludge

The dewatered biosludge (4.5 tons per day) from the centrifuge will be collected through

jute bags/ Hessian bags and will be sent to composting yard for processing to compost in

consultation with the Municipal authorities.The Topo Plan, Digital Satellite Imaginary of the project site, Surrounding of the project

site, STP layout and P&I diagram for the Dindigul STP are shown in Figures 2.1, 2.2, 2.3, 2.4 and

2.5 respectively.


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Figure 2.2 Digital Image


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Figure 2.3 Surrounding Details of the Site


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F

Figure

2.4

STP

layout


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Figure2.5

P&Idiagram


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Figure

2.6

Pipe

line

routing

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dgl part-3_0 DRAINAGE SYSTEM.pdf