ALL ABOUT ENVO BIO GAS PLANT

ALL ABOUT ENVO BIO GAS PLANT 

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ONLINE BIO GAS CALCULATOR 

http://www.anaerobic-digestion.com/html/biogas_calculator.php

POST NUMBER :08   Date : 02/05/2004
BIO GAS PLANT PROCESS DESCRIPTION:

FLOW CHART: CRUSHER(less than 7mm particle size)----thermophilic Aerobic digester(Temp 55 degree C  )---Mesophilic Anaerobic Digester(37 Degree C )---Manure Pit

Biotechnology process

stage one : hydrolysis by hydrolytic bactaria, conversion of extracellular molecules

stage two : thermophilic fermentation based on carbohydrates

stage three : synthesis of volatile fatty acids by acetogenic bacteria

stage four : synthesis of methane by methanogenic organisms

The Principle:

Add bio degradable Solid waste  into predigestor tank. 

Use of thermophilic microbes for faster degradation of the waste. The growth of thermophiles in the predigestor tank is assured by mixing the waste with hot water and maintaining the temperature in the range of 55-60oC. The hot water supply is from a solar heater. Even one-hour sunlight is sufficient per day to meet the needs of hot water.

After the predigestor tank the slurry enters the main anaerobic tank where it undergoes mainly anaerobic degra-dation by a consortium of archae-bacteria belonging to Methanococcus group.  They produce mainly methane from the cellulosic materials in the slurry.

The undigested lignocellulosic and hemicellulosic materials then are passed on in the settling tank. After about a month high quality manure can be dug out from the settling tanks. Earth worm can be introduced to settling tank to speedup the process.There is no odour to the manure at all. The organic contents are high and this can improve the quality of humus in soil, which in turn is responsible for the fertility.The manure generated is high quality and can be used in fields.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.

As the gas is generated in the main tank, the dome is slowly lifted up. This gas is a mixture of methane (70-75%), carbondioxide (10-15%) and water vapours (5-10%). It is taken through GI pipeline to the gas purification unit. Drains for condensed water vapour are provided on line. This gas burns with a blue flame and can be used for cooking as well.

The gas generated in this plant is used for gas lights fitted around the plant. The potential use of this gas would be for a canteen. The purified gas can be fed to bio fuel electric generator to produce electricity. Gas can be bottled and used to run vehicles.

Tanks of Biogas Plant

1.     Mixer with stirrer to mix hot water (1:2) to form a slurry,

2.     Aerobic Digester,

3.     Anaerobic digeter

Mechanical Items :

1.Gas Holding MS Steel Dome

2.Steel Fabricated Covers on Manure Pits,

3.Mixer Stirrer ,

4.Air Compressor

5.Gas Holder and gas purification system

6.Water Pump and Slurry Pump

7.Water and Gas Pipelines on Plant area

8. Electric Fittings & Miscellaneous

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	30-35	8,000/-	100-120	0.1	300	5hp(2hr)	2	2	200	2-3
2	36-39	12,000/-	200-240	0.2	500	5hp(3hr)	3	3	400	4-5
4	60-65	22,000/-	400-480	0.3	700	5hp(3hr)	4	5	400	8-10
5	85-87	30,000/-	500-600	0.5	800	10hp (4hr)	5	7	600	12-14 (25Kw)
10	1 cr -1.2 cr	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 –

Decentralised treatment options introduced in new rules.

The earlier rules relied on costly centralised facilities for treating and disposing municipal wastes while approximately 50 per cent of it can be easily turned into compost at the local level. Thus, the draft rules have made the much-needed provision for providing incentives to decentralised waste treatment facilities. 

http://www.downtoearth.org.in/blog/a-clean-country-in-the-offing-with-new-solid-waste-rules-49484

Considering an average garbage generation per capita per day as 0.450 Kg, we can assume a total garbage generation for a population of 100,000 as 45,000 Kg per day

Proven on wide range of wastes and feedstocks including

• Livestock and agricultural wastes
• Biomass
• Sewage and industrial sludges
• MSW and catering wastes
• Food industry wastes
• Vegetable market waste
• Restaurant Waste
• Farm House/Cattle manure waste
• Slaughter House/Tannery waste
• Presumed waste

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.

POWER GENERATION: Bio Gas production = 100 cu mtr /day for 0.5 ton of waste

Methane content (65.75%) = 65.75 cu mtr

Calorific value =28.9 MJ/N.cu mtr

Energy content 65.75x28.9x273/(273+30)=1712 MJ/Day

Generator efficiency--- 30%

Electricity generated =0.3x1712x1000000/3600x1000

= 142.66

Electric power generated = 142.66x0.04167=5.944 kw say 6 kw

= 1.25x 6= 7.5 kva.

We can go for a gas engine of capacity 5 KW . If any gas is left , it will be flared or supplied to staff quarters

Multiply the number of animals by biogas production number...

Example: 600 hogs x 720 m³ biogas / hog / yr = 432000 m³ biogas / year

Multiply the result by the numbers below for cogeneration of electricity and heat...

____________ x 1.7 kWh/ m³ biogas = _________ kWh of electricity per year

____________ x 7.7 MJ/ m³ biogas = _________ MJ of heat per year

Multiply the result by the numbers below for heat production using boiler....

____________ x 15 MJ/ m³ biogas = _________ MJ of heat per year

SOLID WASTE MANAGEMENT IN VARIOUS INDIAN CITIES

 SOLID WASTE MANAGEMENT IN VARIOUS INDIAN CITIES  .TAKEN  FROM  DOWN TO EARTH  MAGAZINE  (CSE)

 You can visit  the original source the read the  full article.

Decentralised treatment options introduced in new rules.

The earlier rules relied on costly centralised facilities for treating and disposing municipal wastes while approximately 50 per cent of it can be easily turned into compost at the local level. Thus, the draft rules have made the much-needed provision for providing incentives to decentralised waste treatment facilities. 

http://www.downtoearth.org.in/blog/a-clean-country-in-the-offing-with-new-solid-waste-rules-49484

Dear All,

First of all, I would like to ofeer Thanks for incorporating few new aspects like involvement of Informal Sectors (especially the Scrap Dealers) and also emphasising the Decentralised Composting and the Collection of Users' Charge. 
However, I would like to know the scopes for the following too .... 
(a) Adequate provisions with added importance on the Health Concern fo the Waste Pickers / Handlers, be it in case of House to House Collection of Segregated Solid Wastes or the Decentralised Composting or waste trasformation in the Informal Sectors like Scrap Dealers.
(b) Decentralisaion of all others aspects like Source Management, Collection, Segragation, Waste Transformation, M&E etc. apart from that in Composting.
(c) Emphasising the Labour intensive Approach for the decentralised activities, alongwith demotivating the highly mechanised process.
(d) Full stop for the unsustained Waste to Energy Approaches.
(c) Strict efforts for Monitoring and Evaluation

Proper redress for the abovesiad issues may eventually make the whole Solid Waste Management Approach more meaningful and result oriented.
Hoping for the Best and all success for "Near Zero" to "Zero Waste Plan" under each Municipalities.
Thanks and Regards.
Nripendra Kumar Sarma
Guwahati, Assam, India

Decentralised integrated solid waste, waste water and solar energy project at New Motibagh, New Delhi

please read http://www.downtoearth.org.in/blog/the-waste-conundrum-44092

Waste Water Management: About 70% of the 8 lakh litres of water supplied to the residents, that is, 5.6 lakh litres of waste water generated is treated in a decentralized waste water treatment plant within the campus using the Moving Bed Bio-reactor (MBBR) technology. There is a net savings of Rs.5 lakhs per annum due to direct and indirect savings from a decentralized Waste Water Treatment plant (WWTP) in the campus whose running cost is Rs.55.55 lakhs as opposed to the centralized sewerage system costing Rs.60.62 lakhs.  

The energy savings from 300 solar street lights at the GPRA complex, covering internal roads, common areas, parking lots and bunglows, help in saving Rs.32.28 lakhs per annum. Along with solar water heaters, the savings on electricity is close to Rs.35 lakhs a year.    

Therefore, a decentralised integrated solid waste, waste water and energy project for about 1000 households can achieve clean and green surroundings and financial savings to the tune of Rs.40-50 lakhs per annum

http://www.downtoearth.org.in/news/garbage-to-gold--29414

Garbage to gold  at mumbai

Though Gowariker and his colleagues are confident of the technology, they caution that refuse pelletisation is not the only or best way to deal with the growing urban garbage problem. Gowariker points out, "A product mix of compost and fuel pellets may be more appropriate, depending on the financial situation and the demand."

http://www.downtoearth.org.in/blog/delhi-s-solid-waste-a-systemic-failure-56776

Delhi’s solid waste: a systemic failure

What can Delhi do?

We need hybrid solutions. We need a landfill, but only for rejects and inerts. We need waste to energy, but then such plants should ensure that they run on segregated waste only. With over 50 per cent biodegradable waste, there is high potential to compost or generate biogas out of the segregated wet waste. And all this cannot work, unless we segregate at source. With over thousands of crores being spent on collection and transportation, time has come to think out of the box. We can learn from our neighbours and cities across India that are doing commendable work on waste management.

Look at the Alleypey model, where residents have taken it upon themselves to segregate and treat waste at source. It is the best model in the country on decentralised waste management. We can even look at Panjim; the municipal corporation not only ensures segregation at source, but also segregates dry waste into 30 different categories. And then there is Mysuru, Suryapet, Bobbili and a lot of other cities that are doing commendable work. They have adopted local solutions, not global to become zero-waste cities. The CSE has documented cities that are doing commendable work on waste management.

Government notifies new solid waste management rules

http://www.downtoearth.org.in/news/solid-waste-management-rules-2016-53443

http://www.downtoearth.org.in/blog/a-clean-country-in-the-offing-with-new-solid-waste-rules-49484

Segregation at source should therefore be at the heart of municipalities’ solid waste management system. The only city that has truly adopted segregation is Panaji. Municipal officials have ensured a citywide system that is designed to collect household waste on different days for different waste streams. This ensures separation. It is combined with penalties for non-segregated waste and has promoted colony-level processing as well. Most importantly, for the bulk of commercial establishments such as hotels it has a bag-marking system so that any non-compliance can be caught and fined.

In Kerala’s Alappuzha segregation happens differently. Here the municipality does not collect waste because it has no place to take it to for disposal. The city’s only landfill has been sealed by villagers who live in its vicinity. This withdrawal of the municipality from waste management has meant that the people have to manage their waste, or be drowned in it. They segregate and compost what they can. The compost is used for growing vegetables and plants in their homesteads. The problem is how to handle all the non-biodegradable waste—paper, plastic, aluminum tins, etc. This is where the government has stepped in. It promotes collection through the already well-organised informal waste-recycling sector. The municipality has ended up saving a huge capital cost it would have otherwise incurred for collection and transportation.

http://www.downtoearth.org.in/blog/solving-india-s-garbage-problem-53956

Waste smart cities  http://www.downtoearth.org.in/coverage/waste-smart-cities-54119