Biogas, which is mainly methane, is a gas produced from the digestion of organic materials in an oxygen-free environment (anaerobic fermentation).

WHAT IS BIOGAS?WHAT IS BIOGAS?

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Household waste, especially from backyard piggeries and poultries, are usually disposed in open-dug pits which are messy, odorous and often are breeding grounds for mosquitoes, flies, rats and pathogenic bacteria. This system of waste disposal threatens the ground water through the infiltration of pollutants.

This scenario creates health hazards as well as potentials for conflict with neighbors.

Why Should I be Interested in BIOGAS:Why Should I be Interested in BIOGAS:

Proper Disposal of Organic Waste

HAVING A BIOGAS DIGESTER CAN SOLVE THIS STICKY ISSUE.

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Methane, which is a main component of biogas, provides cooking fuel for household use as well as energy for other gas-operated appliances such as: refrigerator, iron, and lamps. On a large scale, this can even provide power to run generators and provide electricity.

Energy from Biogas

The digested waste from the system is 90% pathogen free and very high in nutrients, which are vital for plant growth. As opposed to open composting, nutrients from the waste are merely broken down into simpler forms and are not oxidized. This translates to its high value as an organic fertilizer, soil conditioner and as a biological pesticide.

Organic Fertilizer and Pesticides

Why Should I be Interested in BIOGAS:Why Should I be Interested in BIOGAS:

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How Much Do I Stand To SaveHow Much Do I Stand To Saveif I Have A Biogas Digester?if I Have A Biogas Digester?

There are various sizes of household-model biogas digesters with different gas production potentials and waste digestion capacity. The table below shows digester sizes from 4 -10 cu.m. with corresponding gas potential (LPG Conversion and livestock capacity.

CapacityDigester Size (m3)

Gas ProductionEquivalent LPG/Mo.Hogs Cattle Daily

(m3/day)Monthly (m3/mo)

4-12 3 4.0 0.5-1.5 15-45 2.11 Tank

12-18 6 6.0 1.5-2.5 45-75 3.16 Tank

18-24 10 8.0 2.5-3.5 75-105 4.22 Tank

24-30 20 10.0 3.5-4.5 105-135 5.27 Tank

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What Are The Raw Materials for What Are The Raw Materials for Biogas Production?Biogas Production?

Manure

PigHorse

Cattle

Chicken

Human

Gas Yield (m3/kg/day)

0.126-0.340.215-0.315

0.12-0.25

0.31

0.30-0.50

Methane (%)

50-7750-70

50-77

60-65

69-74

Gas Yield of Manure

Gas Yield of Plants

Gas Yield (m3/kg/day)

0.115-0.400.26-0.38

0.34-0.52

0.40

Methane (%)

55-7052-76

50-70

64

Plant Residue

Wheat StrawRice Straw

Corn Straw

Fresh Weeds

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Process Flow of Anaerobic Fermentation, Biogas Production, and Waste-water Treatment.

Schematic Diagram of Biogas ProductionSchematic Diagram of Biogas Production

1

2

3

4

5

Inlet & Mixing Tank

Fermentation Chamber(25-30 daysretention)

Hydraulic Chamber

Outlet

Sludge Tank

Water Recovery Tank

Cooking Fuel

Gas Heaters

Scrubber

Gas Engine

Power Generator

Water Pumping

Lighting

Electricity for Farm use

Filters

Biogas

Gas Line

Inlet Pipe

Overflow

Backyard Model Biogas Digester

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Backyard Model Biogas Digester

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Biogas Equipment for Household Use

The Biogas Home Kit. Electronic-ignited cookstove and shower water heater and biogas desulfurizing unit with pressure gauge.

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A Biogas Lamp, Automatic Rice Cooker, and Stove with Built-in Desulfurizer and Pressure Gauge. System comes with PVC piping and gas control valves.

Biogas Equipment for Household Use

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The WELLISA FarmThe WELLISA FarmMadridejos, Bantayan Island, CebuMadridejos, Bantayan Island, Cebu

Sludge SluiceSludge Sluice

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Sludge InletSludge Inlet

The WELLISA FarmThe WELLISA FarmMadridejos, Bantayan Island, CebuMadridejos, Bantayan Island, Cebu

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Digester Dome and Effluent OutletDigester Dome and Effluent Outlet

The WELLISA FarmThe WELLISA FarmMadridejos, Bantayan Island, CebuMadridejos, Bantayan Island, Cebu

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Settling Pond and Recycling TankSettling Pond and Recycling Tank

The WELLISA FarmThe WELLISA FarmMadridejos, Bantayan Island, CebuMadridejos, Bantayan Island, Cebu

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Water Recycling PumpWater Recycling Pump

The WELLISA FarmThe WELLISA FarmMadridejos, Bantayan Island, CebuMadridejos, Bantayan Island, Cebu

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Gas Collectors and ScrubbersGas Collectors and Scrubbers

The WELLISA FarmThe WELLISA FarmMadridejos, Bantayan Island, CebuMadridejos, Bantayan Island, Cebu

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Power GeneratorsPower Generators

The WELLISA FarmThe WELLISA FarmMadridejos, Bantayan Island, CebuMadridejos, Bantayan Island, Cebu

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Biogas-fired FurnaceBiogas-fired Furnace

The WELLISA FarmThe WELLISA FarmMadridejos, Bantayan Island, CebuMadridejos, Bantayan Island, Cebu

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Biogas-fueled Scalding VatBiogas-fueled Scalding Vat

The WELLISA FarmThe WELLISA FarmMadridejos, Bantayan Island, CebuMadridejos, Bantayan Island, Cebu

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Sludge Drying AreaSludge Drying Area

The WELLISA FarmThe WELLISA FarmMadridejos, Bantayan Island, CebuMadridejos, Bantayan Island, Cebu

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Organic Fertilizer Readied for BaggingOrganic Fertilizer Readied for Bagging

The WELLISA FarmThe WELLISA FarmMadridejos, Bantayan Island, CebuMadridejos, Bantayan Island, Cebu

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The WELLISA FarmThe WELLISA FarmMadridejos, Bantayan Island, CebuMadridejos, Bantayan Island, Cebu

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DODRAM FARMDODRAM FARMRosario, BatangasRosario, Batangas

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DODRAM FARMDODRAM FARMRosario, BatangasRosario, Batangas

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IMI FARMIMI FARMSan Jose Del Monte, BulacanSan Jose Del Monte, Bulacan

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DEWATS in Bureau of Animal IndustryDEWATS in Bureau of Animal IndustryValenzuela, BulacanValenzuela, Bulacan

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DEWATS in Bureau of Animal IndustryDEWATS in Bureau of Animal IndustryValenzuela, BulacanValenzuela, Bulacan

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