Some figures on the biogas?

[izentrop]

As long as we remain in an economic scheme of the "effluent treatment" type, manure, slurry, various waste from the agro-food industry, crop residues, .., which is now more or less the case in France, that does not pose a problem from my point of view. It "costs" money to the community overall, but it is the price to pay to eliminate / enhance our waste. There is no more synthetic fertilizer used, to answer your question.

It actually becomes very different as soon as we start to grow plants (including the German "model" corn) to put it in the oven directly after grinding in methanizers .... There we are no longer in a "treatment" scheme effluents ".

It should be noted that Germany has almost eliminated electricity purchase rates for new biogas projects, which is a sign that they have certainly gone too far.

You seem to know the area well.
Soils of conventional agriculture are generally lacking organic matter. Except for intensive farming areas, manure and slurry must return to enrich humus soils.
The disgestats, having lost all their energy, have the same effect as the synthetic fertilizer by destroying the humus of the soil. This requires delicate management, or farmers' reserves.

What exactly do they do with 35% of CO2 biogas extracts? It is about food CO2, but in the end, it must end well in the atmosphere?

[sicetaitsimple]

Soils of conventional agriculture are generally lacking organic matter. Except for intensive farming areas, manure and slurry must return to enrich humus soils.
The disgestats, having lost all their energy, have the same effect as the synthetic fertilizer by destroying the humus of the soil. This requires delicate management, or farmers' reserves.

What exactly do they do with 35% of CO2 biogas extracts? It is about food CO2, but in the end, it must end well in the atmosphere?

On the first point, you are probably right, it certainly requires a different management, even if the solid part of the digestate still contains organic matter, that which the bacteria have not succeeded in "digesting".

For CO2 I don't know in the case of this installation, but in my opinion it should be rejected. It seems "small" to me to consider a packaging unit, marketing, .... The large gas manufacturers certainly do this much more efficiently from sources already highly concentrated in CO2 (production of ammonia, bioethanol, ..). And anyway, after use it ends up in the air! Perhaps a possible niche use if the geography lends itself to it would be the CO2 enrichment of the atmosphere of a greenhouse?

[sicetaitsimple]

For those interested, who have a little time, and who read English, a study that I found very interesting on the comparison between Germany and France in terms of public policies on anaerobic digestion.

Basically and really short, in Germany it was pulled by energy policy (Energiewiende) and in France rather by environmental considerations (reducing the impact of agriculture), the electricity sector is already largely decarbonated.

It is very interesting to note that despite basic conditions close enough for agriculture (climate, markets, ...) the two models diverge significantly.

https://www.euki.de/wp-content/uploads/ ... icy-fr.pdf

[Did67]

The disgestats, having lost all their energy, have the same effect as the synthetic fertilizer by destroying the humus of the soil. This requires delicate management, or farmers' reserves.

What exactly do they do with 35% of CO2 biogas extracts? It is about food CO2, but in the end, it must end well in the atmosphere?

1) No, not quite.

Anaerobic bacteria produce biogas from non-woody organic matter (sugars, starch, cellulose). Cellulose is one of their main foods for example when methanizing manure.

Most of this C would also go "in the air", after spreading in a field. Or when composting! When we say that this "stimulates biological activity", it means that it is used as food for the organisms of the soil, which are mainly aerobic, and which therefore releases the C, source of energy, in the form of CO² once that - here oxidized. Exactly like us!

The lignin just passes through the digester and ends up in the digestate, which is a kind of fairly viscous "spinach dish".

Now lignin is, under the action of mushrooms, one of the main sources of humic substances.

There is therefore no question, balance sheet C, of ​​a significant difference between the contributions of biomass directly (for example manure) and the intakes of digestates resulting from the digestion of this manure.

There is, of course, one for biological activity and soil aggradation.

2) The CO² extracted from the biogas returns to the air. But we must remember that it is the CO² that the plants had absorbed to form the biomass that we have just digested. The whole process, apart from fossil fuels used in transport, is therefore "neutral" in CO². Exactly like a biomass or pellet boiler.

[Did67]

It is very interesting to note that despite basic conditions close enough for agriculture (climate, markets, ...) the two models diverge significantly.

I did not read.

But this is where we see that regulations influence what will happen.

In Germany, the focus was on NaWaRo (Nachwachsende Rohstoffe) = biomass. The taps were opened wide, without constraints. Subsidized prices guaranteed enough "favorable". Results, energy crops have ... soared (to make an easy emot game). The price of land has gone up. And that posed problems of agricultural policy and food production. Not to mention the ecological "disasters" that were the crops of corn, or of fodder rye collected under appalling conditions, with total degradation of the grounds. German diesel technology with huge tires to get out of ruts. In the opinion of German specialists themselves: a disaster.

In France, where we like to flog ourselves, and where we don't always think enough, we "admired" the German model, the number of anaerobic digestion stations (in thousands at a time when the French stations were counted on the fingers of a hand).

More annoying, however, proven technologies are almost always German today. There, we missed the boat, indeed!

In France, surcharges have been given for the treatment of agricultural effluents (slurry, manure: at least 50%). Another bonus "rewards" energy recovery (use of hot water in the case of cogeneration). In principle, only CIPAN can be digested (Intermediate Cultures) ...

I think we have been very slow. But less con.

Moreover, the Germans revised their policy half a dozen years ago and got out of their "madness" a bit. Without going back, of course on what was done. Regulatory changes are never retroactive!

[In contrast, technology influences politics: impossible for now, in the country of BMW, Mercedes, Porsche to impose a speed limit on highways - despite cartons of rare violence! Overall mortality is not superior, however, I believe.]

[moinsdewatt]

17 million euros for the Emerald Bio-Energy methanizer

STANISLAS DU GUERNY Factory New 13 / 06 / 2019

Emeraude Bio-Energie inaugurated the 13 June its brand new methanizer installed in Lamballe (Côtes-d'Armor). 17 million euros were invested in this equipment, which has a biogas conversion capacity of 156 000 tonnes per year of waste from 120 pig farms but also slaughterhouse waste.

The 79 million kwh of biogas that will be produced each year will be injected into the grid by GRDF for the supply of energy to part of the homes - 3 100 houses and apartments - in the municipality of Lamballe. The digestate of the methanizer will also produce solids that will be used as fertilizer for agriculture and market gardening. As for the water also from the digestate, it will be reused by the Cooperl group, the shareholder of Emeraude Bio-Energie, particularly for the cleaning of part of its equipment.

In the long term, other biogas plants of this type are planned in order to solve the problem of farm effluents from Cooperl, the number one in France for pig processing.

In 2018, the cooperative group achieved a turnover of 2,3 billion euros. Every year, the industrial producer shoots and transforms 5,7 millions of pigs. One third of its volumes are destined for export markets.

https://www.usinenouvelle.com/article/1 ... ie.N854510

[moinsdewatt]

Continuation of this post from 22 seven 2018 http://www.oleocene.org/phpBB3/viewtopi ... 6#p2272596

Thoiry Safari Zoo turns manure into green energy

• 12 August 2019

With the creation of an anaerobic digestion unit in the heart of Thoiry Park, it becomes the world's first zoo heated by biomethane from its waste. A project that perfectly illustrates the possible synergy between waste and energy.


"We had two issues in the park. A waste issue, green waste and animal manure, and an energy issue, with the heating of the habitats of exotic animals, explains Colomba de la Panouse, deputy general manager of the safari and zoo of Thoiry, and founder of Thoiry bioénergies. I wanted us to be more virtuous on these two aspects. " It was therefore under the impetus of its director that an anaerobic digestion unit was installed in the park, it produced its first cubic meters of biomethane in September 2018.

11.000 tons of manure and methanised green waste

The continuous dry process is fully automated and takes place entirely in a closed environment. Almost 11.000 tonnes of material will be treated each year by the methaniser: manure and green waste from the park, but also from nearby agricultural activities, and unsold fruit and vegetables from supermarkets. "We are in a logic of short circuit, everything that will be methanized will be collected within a radius of 15 kilometers", specifies Colomba de la Panouse.

This anaerobic digestion unit represents an investment of 5 million euros (with the support of the Ile-de-France and Ademe region for 24,7% and 19,20%), and an additional cost of million euros related to landscaping and the reduction of olfactory and noise pollution.

Heat the park facilities

The biomethane produced is injected into the grid, after an extension of the natural gas network carried out by GRDF. The anaerobic digestion unit will have an injection capacity of up to 250 Nm3 / h but the flow will be between 100 and 130 Nm3 / h in the first years.

The device allows the safari park facilities (16th century castle, orangery, and habitats of the majority of animals in the zoo and the park) to heat themselves only with the gas produced by the installation. More broadly, the biomethane injected into the network will supply, in part, nine surrounding communities. Its production should represent more than 20% of the total gas consumption of the nine communities during the summer period. A ratio called to double thereafter.

9.500 tonnes of digestate will be produced each year and will be used as fertilizer in the park and for local farmers. An educational area was set up in the heart of the zoo to sensitize 440.000 annual visitors to sustainable development through this methanation process

https://m.actu-environnement.com/actual ... 33802.html

[moinsdewatt]

The first methanizer of Haute-Loire explained in three stages

SAINT-LAURENT-CHABREUGES the 28 / 10 / 2019

Started since the 1er August, the methanization unit of the company Agri Briva Métha was officially inaugurated Friday, in Saint-Laurent-Chabreuges, in the Brivadois. Zoom on an example that could emulate.

An "ambitious project", of "collective interest", carried out "to the end despite the difficulties". The whole political class (*) and the prefect of Haute-Loire welcomed Friday the completion of the project of anaerobic digestion of Saint-Laurent-Chabreuges. For the project leaders - Gaec Crossbow, Plain, Froment alive and Trio, gathered in a single structure Agri Briva Métha - it is the realization of nine years of work; the initiation of the project dating from 2010. Here are the three steps of the anaerobic digestion unit.



autumn.
"The regulations do not allow more than 15% of corn in substrate for methanation," says Ismael Samson, project owner and co-shareholder of the project. We are at 10%. It helps to secure the deposit, corn having a very good yield because it produces a lot of plant material. "

2- The process of "digestion"
About 25 tons of material are sent daily to the methanizer. It consists partly of two large vats (25 m diameter, 4 m high and a capacity of 4.000 m3 each) that "reproduce the belly of a ruminant". They are heated to 40 degrees, partly thanks to the gas produced on site. And the matter they contain, called "soup," is "stirred by agitators for about a third of the time." "We must avoid a crust forming at the top that would prevent the release of gas," says Ismael Samson. After 70 days, the content switches from one tank to another. The process, called "digestion", produces gas on the one hand, and digestate on the other hand. The gas is first stored at the top of the tanks and then undergoes several operations: it is cooled, cleaned (sulfur is removed in particular) and then purified to keep only pure methane at least 97%.

3- The valuation
In the case of Agri Briva Métha, the methane is then exclusively purchased and marketed by Butagaz, on the basis of a 15 year contract, which makes it possible to provide additional income for the associated farmers. The production of the anaerobic digestion unit ensures 10% of the gas consumption of the city of Brioude.
For its part, the digestate (solid or liquid) can be used by farmers as natural fertilizer on their 800 hectares of plots.

https://www.leveil.fr/saint-laurent-cha ... _13673282/

[moinsdewatt]

Inauguration of the first biomethane plant in the department of Mayenne

BY FRÉDÉRIC DOUARD SEPTEMBER 17, 2020


The installations of the Méthamaine biomethane plant in Mayenne, photo Naskeo

Since February 11, 2020, the methanization unit of SAS Methamaine located in Meslay-du-Maine has produced biomethane injected directly into the local distribution network. It is produced from livestock effluents from eleven farms, all located within a radius of ten kilometers, and horse manure collected by a specialized company. The installation has just been inaugurated on September 11, 2020.

The organic matter deposit is 21 t / year, of which 000% of the volume contributed by shareholders. Annual production targets 80 GWh of biogas and will inject 10 Nm115 CH3 / h of biomethane per hour, equivalent to 4% of the gas consumption of the city of Meslay-du-Maine in winter and 50% in summer.

.........

https://www.bioenergie-promotion.fr/855 ... e-mayenne/

[moinsdewatt]

An anaerobic digestion plant to supply Crest with green gas

Friday August 20, 2021 By Alice Marot, France Bleu Drôme Ardèche Vaunaveys-la-Rochette

Transforming fruit and vegetable waste to supply gas to an entire city ... This is what the new anaerobic digestion plant installed in Vaunavays-la-Rochette is doing. Thanks to it, the whole town of Crest can run on green gas this summer.

Green gas, produced and consumed in the Drôme ... Farmers from Vaunaveys-la-Rochette are launching an anaerobic digestion plant connected to the GRDF network in the neighboring town of Crest. Objective: to produce gas for kitchens, radiators or cars in Crest, in a more ecological way. After the Etoile-sur-Rhône plant, it is the second plant in the department to inject its gas directly into the GRDF network.

In project for more than 10 years, the Mourrière Méthanisation plant has been operational since the beginning of May. For the moment, it receives about twenty waste per day: horse manure, fruits, vegetables, lavender hay ... It is the local companies which supply, like Andros or Charles & Alice, or the peasants of the department for the waste. agricultural.


In front of the factory, large piles of salads, avocados, and plants are spread out over several meters. © Radio France - Alice Marot

These wastes are first crushed, then spend 40 days in large round tanks, which work on the principle of a stomach. "Inside, there are bacteria that will eat these materials, and manufacture gas by degrading them. It is the same functioning as in our body, it is living, explains Mathieu Pommarel, the president of the 'factory.


The waste remains stored in large tanks for 40 days, and releases methane which swells these green membranes. © Radio France - Alice Marot

Once the gas has been extracted, then cleaned to isolate the methane, it can be injected into the GRDF network. With only 20 tonnes of waste per day, the plant already supplies the whole town of Crest. "The success of their project leads them to saturate the city's network", welcomes Hervé Mariton, the mayor.


After being extracted from the waste, the gas passes through these tubes to separate carbon dioxide and methane. © Radio France - Alice Marot

Mathieu Pommarel intends to ramp up, and reach 40 to 50 tonnes of waste delivered per day. From next year, the plant will offer its green gas to supply Bertolami buses, as well as private cars. A loading station will be installed in Crest next February.

https://www.francebleu.fr/infos/agricul ... 1629214550