Micro-Biogas-Plant

Arno Reiter

Markus Kaufmann

March 17th, 2019

A-3435 Erpersdorf, Donaugasse 3

Arno Reiter GmbH3435 Erpersdorf, Donaugasse 3Austria

Phone: +43/ 2277/ 26 500Fax: +43/ 2277/ 26 500/ 124Email: office@arno-reiter.at

Tax Identification Number: ATU 70399614Company Registration Number: 444860g LG St.Pölten

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Contents

1 Introduction 4

2 Note on Organic Waste 6

2.1 Green Cut, Shrub, Branches of Trees and the like . . . . . . . . . . . . . . . . 72.2 Substances that are not supposed to be introduced at all . . . . . . . . . . . . . 7

3 Scope of Delivery 8

3.1 Delivery time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83.2 Optional: Separation unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93.3 Optional: shredding unit for green waste . . . . . . . . . . . . . . . . . . . . . 93.4 Optional: Remote control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4 Technical Specs 10

5 Price 11

5.1 Indicated Price includes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115.2 Indicated Price does not include . . . . . . . . . . . . . . . . . . . . . . . . . 11

6 Graphical Illustrations 12

6.1 Schematic Illustration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126.2 Exterior Views of the Micro-Biogas-Plant . . . . . . . . . . . . . . . . . . . . 13

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1 Introduction

The purpose of the micro biogas plant is to feed organic waste to a biological fermentation plantand to make the resulting biogas available for further use. The resulting fermentation residuecan be used as a liquid soil conditioner (such as fertilizer).

In this case, organic waste amounting between 100 kg up to 1,000 kg per day can be recycled,and up to 120 m3 of biogas per day can be obtained. The amount of biogas produced is directlydependent on the type and freshness of the organic waste introduced.

The methane contained in the biogas is a valuable fuel. The biogas can be used directly as fuelin its own gas engines, or added to other fuels. It can also be converted to electricity, used ascooking gas or as heating gas (in lean gas burners).

For logistical reasons, the entire micro biogas plant is mounted in a 20-foot freight container.Upon delivery, the gas storage is mounted on the roof of the container and the connections(electricity, heat, gas extraction) are connected. The commissioning and training is done by us,a self-commissioning is not provided.

For the erection of the 20-foot container, a strip foundation, built in accordance with localregulations, must be provided by the customer. The total weight in full operation is about 35tons.

Any number of micro biogas plants can be operated parallel to each other.

Insertion of Material

The introduction of the organic waste takes place via a shredding unit (shredder). This ismounted in the front part, and (just like all other control elements) accessible after openingthe container doors. The further feeding of the shredded waste into the fermentation space takesplace automatically via a pumping system.

Fermentation

The fermentation room is equipped with a heater and a paddle stirrer.

The heating must be externally powered to keep the temperature in the fermentation room con-stant, especially during cooler months. The demand for heat energy depends on the ambienttemperature.

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The paddle stirrer is driven by an electric motor via a flanged gear and operated at a constantspeed. The motor control is done by the integrated control.

The actual fermentation is fully automatic. No operator intervention is required.

Biogas

The resulting biogas is collected in the gas storage tank (mounted on the top of the container andsecured against wind). The biogas can be removed for further use via the connection points.

The entire gas system is operated with a maximum pressure of 5 mbar and is equipped with amechanical overpressure safety device. In case of overpressure the biogas is released into theatmosphere.

The quantity and quality of the resulting biogas is directly dependent on the type and freshnessof the organic waste introduced.

Digestate

The fermentation residue (after fermentation) is drained and can be used as a liquid soil im-prover (such as fertilizer). The composition of the digestate is directly dependent on the mate-rials introduced.

Optionally, a separation unit may be provided to separate the solid and liquid components ofthe digestate directly upon removal.

Note: The applicable legal regulations for the installation and operation of gas pipes (safety gascontrol system) must be observed.

The applicable legal regulations for hygiene and the handling of organic waste must be ob-served.

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2 Note on Organic Waste

Only organic waste may be introduced. All non-organic components (for example packagingresidues, plastic or metal parts, glass, etc.) must be removed BEFORE they are introduced intothe shredding unit.

In principle, all types of organic waste can be used. However, it should be noted that someorganic wastes provide very little to no gas yield.

Organic waste can be exemplary:

• leftovers, for example from (large) kitchens or canteens

• Expired (overlaid) foods

• edible oils

• Old, hard or inedible pastry (bread, etc)

• Fish waste

• Old fruits and vegetables

• and so on

However, almost all organic wastes consist partly of water; some more and some less. But theproportion of water does not ferment, hence no biogas is obtainable from this fraction. Onlythe solid, organic fraction can be converted to biogas. (There is still a mineral content that isignored here for the sake of simplicity.)

A small example

A tomato is about 90% to 95% water. The pulp accounts for only 5% to 10% of the totalweight. If, for example, 100 kilograms of tomatoes are introduced into the micro biogas plant,this means that only 5 to 10 kilograms are fermented. The remaining 90 to 95 kilograms arewater, which does not account for any gas yield but takes away the place for more profitablewaste.

If you take, for example, old bread, it looks exactly the other way around. Only very little toalmost no water is available in old bread, thus a very high proportion of it may be convertedinto biogas.

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2.1 Green Cut, Shrub, Branches of Trees and the like

For the introduction of green waste, a separate shredding unit should be provided, which isespecially suitable for long-fiber material. It should be noted that green waste in the fresh stateis not very profitable because of its high water content.

It is to be refrained from the introduction of shrub and branches (of trees), or other parts ofwood. Wood is not suitable for fermentation due to its content of lignin.

2.2 Substances that are not supposed to be introduced at all

Under no circumstances may materials be introduced that adversely affect the biological processof fermentation. For example:

• All kinds of packaging materials (cardboard, paper, metal, plastic, glass, etc)

• All types of disinfectants or cleaning agents

• All types of medicines

• All types of mineral oils

• and so on

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3 Scope of Delivery

A 20-foot container, equipped with:

• a closed fermentation room made of stainless steel with heating cables

• a paddle mixer with electric drive and gearbox

• a gas storage tank with wind protection bands

• Overpressure protection for the gas system

• a pumping system for introduction into the fermentation room and for removing the di-gestate

• a shredding unit, primarily for food waste

• Valves and/or slides

• Stainless steel piping

• Electric control

• Documentation with CE certification, user manual

• Connection options for:

– Power supply (16 amps max.)

– Heat supply (1-inch male thread supply and return)

– Gas extraction (5/4-inch external thread)

– Digestate removal (DN 50)

3.1 Delivery time

The production time is 8 to 10 weeks after clarification of the on-site technical requirements.

The transport duration depends on the respective destination.

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3.2 Optional: Separation unit

For separating the solid and liquid components upon removal of the digestate.

3.3 Optional: shredding unit for green waste

For better comminution of long-fiber materials, such as green waste.

3.4 Optional: Remote control

To control and view the operation via a mobile Internet connection.

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4 Technical Specs

Dimensions and Weights:

Size: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-Foot-ContainerWidth × Length × Height: . . . . . . . . . . . . . . . . . . . . . . . . . .2.43 × 6.06 × 2.59 MeterTotal Weight in full Operation: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . app. 35 TonsA foundation has to be built on site!

Shredder:

Power Consumption: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 kW

Agitator:

Type: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Paddle-AgitatorPower Consumption: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.2 kW

Pumping Station:

Power Consumption: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 kW

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5 Price

1 unit Micro Biogas-Plant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . on RequestPrice valid until . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .on Request

5.1 Indicated Price includes

• Short on-site training

• Commissioning on site

5.2 Indicated Price does not include

• Sales tax or locally incurred duties and fees

• Transport from the Zwentendorf plant (Austria) to destination

• Transfer at destination (crane or similar)

• Fasteners needed on site (pipes, electrical wiring, etc) for connecting to consumers

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6 Graphical Illustrations

All illustrations are symbolic representations and may differ from actual appearance.

6.1 Schematic Illustration

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6.2 Exterior Views of the Micro-Biogas-Plant

(a) Front View (b) Right Hand Side View

(c) Rear View (d) Left Hand Side View

Figure 1: Micro biogas plant - Perspective view from all sides

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