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Monday, July 14, 2008

Bio Gas from Kitchen Waste

CASE STUDY---COMPOST PLANT FOR BIO DEGRADABLE SOLID WASTE AT SAW PIPE, Mundra

Source : Kitchen waste from the residential area of the factory

Quantity = 500 kg per day

System Installed : Aerobic followed by anaerobic bio reactor.

THE PROPOSAL:

Breakup of the 0.5 T Biogas Project Cost

Civil Construction of Biogas Plant

Gas Holding MS Steel Dome

Steel Fabricated Covers on Manure Pits,

Mixer Tank

Air Compressor

Solar Water Heater

Water Pump and Slurry Pump

Water and Gas Pipelines on Plant area

Electric Fittings & Miscellaneous

Stirrer for mixer



Total Project cost Rs.5,50,000/-

Technology and Consultancy Rs. 1,00,000/-



Grand Total Cost of Project Rs.6,50,000/-

OUR RECENT PROJECT ON BIO GAS GENERATION AND UTILIZATION FROM LIQUIDE WASTE :

BHOLABA DAIRY LIMITED. ALIGARH, U.P.

Bio Gas Generation from Dairy waste :

Ms Bhole Baba Milk food Industries Ltd. is coming up with a new plant at khair road, Aligarh

The Dairy will handle about 10-lac litre of milk every day. Depending on the season, major differences occur in the quantities of milk received from cooperative milk federation and in the use of butter, butter oil and milk powder. The value added products manufactured will be Casein,Milk Protien Concentrate,Lactose-Both Food &Pherma,Demineralised Whey Protien,Whole Milk Powder,Skimmed Milk Powder, & White Butter In Bricks Form, with future planning to produce processed Cheese/Mozerella.

CHARACTERISTICS OF GENERATING EFFLUENT WATER:

The values of incoming wastewater at ETP is as under:

S.No.

Parameter

Unit

Value

pH

6.0 – 10.5

Total Suspended Solids

Mg/l

1500.0 – 2000.0

B.O.D.

Mg/l

1500.0 – 1800.0

C.O.D.

Mg/l

2500.0 – 3500.0

Oil & Grease

Mg/l

150.0 – 250.0

Rated capacity of ETP

KL/Day

1,000.0

  1. Bio-gas collection & utilization or Flaring: The gas produced in the UASB reactors is led to the gas holder through a moisture trap and gas flow meter.The outlet of the gas holder is to be branched off in two directions, one going to the generator room for supply to the engines and the other to the gas flaring equipments. The primary purpose of a gas holder is to adjust the difference in the rate of gas production and consumption.The gas engines demand a constant supply of bio gas at a constant pressure. The bio gas holder is designed for a storage of 4 hours of bio gas production normally at a pressure of 40m bar. As bio gas enters or leaves, the holder rises or falls with the help of guide rails. Valves in the gas lines will be operated manually to maintain the gas dome at 90%(Gas flaring level), 80%(Engine level) and 20% (Low levels, where engine as well as flaring will be stopped and the dome will be allowed to rise.).

GAS PRODUCTION & POWER GENERATION:

The gas flowing upward with the liquid will be prevented from escaping with the treated flow by GLSS and beam deflector, which will divert it to the gas collector domes. The gas produced shall be passed through 100 mm dia FRP pipe for individual domes and collected at a common point for each reactor by a common header of 200 mm dia pipe from where it will conveyed to the gas holder for constant flow to the gasomete generator or flaring in open atmosphere at about 6 meter above ground level.

.

Capacity of gas holder:

The primary purpose of a gas holder is to adjust the difference in the rate of gas production and consumption. As bio gas enters or leaves, the holder rises or falls by guide rails.

Provide a gas holder of 300 cu mtr capacity.

POWER GENERATION:

The bio gas produced in UASB process should be utilized for production of electric power. The amount of electric power generated shall be as under:

We can go for a gas engine of capacity 10 KW . If any gas is left , it will be flared or supplied to staff quarters.

NOTE FOR COMPARISION : A 56 mld UASB plant having Inlet COD =400 ppm can safely run a 45 KW gas engine.

Literature Study :

The Principle:

Biomass in any form is ideal for the Biomethanation concept, which is the central idea of the Biogas plants. Based on thermophilic microorganisms and microbial processes develop the design of the biogas plant. The plant is completely gravity based.

Brief process description:

The segregated wet garbage (food waste) is brought to the plant site in bins and containers. It is loaded on a sorting platform and residual plastic, metal; glass and other non-biodegradable items are further segregated. The waste is loaded into a Waste Crusher along with water, which is mounted on the platform. The food waste slurry mixed with hot water is directly charged into the Primary digester.

This digester serves mainly as hydrolysis cum acidification tank for the treatment of suspended solids. For breaking slag compressed air is used for agitation of slurry. Compressed air will also help in increasing aeration since bacteria involved in this tank are aerobic in nature. The tank is designed in such a way that after the system reaches equilibrium in initial 4-5 days, the fresh slurry entering the tank will displace equal amount of digested matter from top into the main digester tank.

Main digester tank serves as a methane fermentation tank and BOD reduction takes place here. The treated overflow from this digester is connected to the manure pits. This manure can be supplied to farmers at the rate of 4-5 Rs. per Kg. Alternatively municipal gardens and local gardens can be assured of regular manure from this biogas plant.

The biogas is collected in a dome (Gas holder) is a drum like structure, fabricated either of mild steel sheets or fibreglass reinforced plastic (FRP). It fits like a cap on the mouth of digester where it is submerged in the water and rests in the ledge, constructed inside the digester for this purpose. The drum collects gas, which is produced from the slurry inside the digester as it gets decomposed and rises upward, being lighter than air. 1" GI piping will be provided up to a distance of 50 m from the Biogas plant. Biogas burners will be provided. The biogas can be used for cooking, heating and power generation purpose.

Cost details, saving and payback period from a biogas plant:

The cost details and the savings envisaged from the plant are given in the following table. The life of the plant could be 20-30 years and payback period is 4-5 years.

Capacity (Tons / Day)

Installation Cost (Rs In Lacks)

Monthly Operation and Maintenance Charges (Rs)

Methane Generation M3

Manure production (tons /day)

Area Required M2

Power

Manpower

Fresh Water (KL /day)

Hot water (Ltr / day of 50-60 C0)

Cooking Fuel (Equivalent to LPG Cyl / day)

1

8-10

8,000/-

100-120

0.1

300

5hp(2hr)

2

2

200

2-3

2

10-12

12,000/-

200-240

0.2

500

5hp(3hr)

3

3

400

4-5

4

20-22

22,000/-

400-480

0.3

700

5hp(3hr)

4

5

400

8-10

5

28-30

30,000/-

500-600

0.5

800

10hp (4hr)

5

7

600

12-14 (25Kw)

10

65-70

50,000/-

1000-1200

2.5

1200

15hp (4hr)

10

15

1000

22-25 (50Kw)

* This is an approximate cost for biogas generation plant and may increase by 10%–20%, depending on location, site-specific parameters, cost of materials, labour cost, etc., in different states/cities. Cost of additional infrastructure like office space, toilets, security, Godown, Shades and power generation will be extra, if required.

Rs – rupees; m3 – cubic meters; m2 – square meters; h – hour; kL – kilolitre; LPG – liquefied petroleum gas; kW – kilowatt; cyl – cylinder

Suitable locations for installation of plant

Hotel premises, army/big establishment canteens (private/ government), residential schools/colleges, housing colonies, religious places / temple trusts, hospitals, hotels, sewage treatment plants, villages, etc.


Saleem Asraf Syed Imdaadullah
Envo Projects
Mobiles : 9899300371
311/22,Zakir Nagar,New Delhi-110025
email: saleemasraf@gmail.com
web: http://saleemindia.blogspot.com/

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