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- 1 Comment
- 2 Changes, landfill gas
- 3 Uses for Biogas
- 4 Swamp gas
- 5 Malta
- 6 Typical composition of Biogas
- 7 Siloxanes and thermophilic digestion
- 8 Missing article
- 9 Biogas project
- 10 Production
- 11 'History' section
- 12 This sentence is nonsensical
- 13 Biogas is not renewable
- 14 If swampgas is going to be routed to this page then there should be an explanation of what it actually is
- 15 Affect on rural and poor areas
- 16 Reversion of large addition
I have made some significant changes and alterations to this page. It required clean up and making relevant. I suggest that anaerobic digestion should be concentrated on that page and not go into depth about digestate here.
--Alex 10:09, 14 July 2006 (UTC)
- This article had become a complete jumbled mess! I have significantly reworked the article again, wikifying it and moving information that distracts from the main purpose - discribing the production, composition and applications of biogas. Although related the article doesnt need essays on the effects of siloxanes on gas engines - these should be in the relevant areas of wikipedia. It does need some focus in expanding sections on landfill gas etc. The tables on EU biogas utilisation are interesting but took the whole article over. I have moved these to their own new article. I have also taken two pictures that improved the very small picture of a biogas bus which wasn't really doing much to make it more visually stimulating.--Alex Marshall 15:51, 4 December 2007 (UTC)
what biogas means
With natural gas quickly becoming more valuable than electricity, shouldn't we include a section on how biogas can be processed and sold as natural gas? --Flatline 19:29, 20 September 2005 (UTC)
- I don't think it's normally cleaned up to pipeline quality levels. I think they just dehydrate it and burn it as is, or burn it after mixing it with natural gas. It is possible to do so, I just don't think that the money spent cleaningfdfsfsdfsdfsdf:Biogas is a side business for farms, sewers and landfills. Biogas plants are a distributed energy source, each plant doesn't produce a huge amount of gas. Usually, there's just enough gas to fire a 0.1 to 10 MW turbine/reciprocating engine (a large power plant is 500-1,500 MW). All of the equipment used to make the gas, treat it, burn it, control pollution... is duplicated at each plant. They don't have economies of scale like big power plants and big natural gas processing plants (that clean natural gas). -- Kjkolb 12:26, 1 January 2006 (UTC)
There has been some moves towards molecular sieves for cleaning to pipeline quality, but it is still rare. The cost is too high and the there is also a tail gas generated with a small percentage of methane. Unfortunately the tail gas cannot be disposed of easily. Also, remember that a digester needs to maintain a certain temperature, so one of the primary uses is in boiler/heat exchangers to control temperature in the digester. Varec (talk) 06:18, 26 June 2010 (UTC)
Changes, landfill gas
I made a lot of changes to the lower half of the article. If you disagree with them, I encourage you to edit them. Leave a note here or in the edit summary, if appropriate.
I think the landfill gas section in natural gas should be incorporated here and then landfill gas should redirect to this article. If no one objects, I will do so shortly. -- Kjkolb 13:53, 1 January 2006 (UTC)
I saw your comment, I had forgotten about biogas (doubtless others as well), but I'm not sure it is a direct biofuel as it is defined (or as least as it is defined here, I have not seen the term used elsewhere, but it seems useful to have, so I decided to expand it). Biogas needs a different fuel system, and thus engine modifications. Compare to biodiesel which can be used in any diesel engine by just pulling up to the biodiesel pump instead of the D2 pump. (If you can find such a pump, but that isn't the issue here). BluGill 16:25, 26 August 2006 (UTC)
- Hi BlueGill I am confused by your definition of "direct biofuel". Biogas can be used directly into a standard gas engine. I understand where you are coming from regarding vehicle transportation but the standard car engine is not the only engine that is available. I'm also not an engineer so I can't get into the specific debate on engines, however I think if you dont accept biogas as a direct biofuel you need to be clear on your engine definitions. Cheers --Alex 16:11, 27 August 2006 (UTC)
- Hallo sir i want some more information regard to biogas. Is biogas is use as fuel in vehicles by some chemical process ? and if yes then what process need to be done on biogas to use in vehicles.
Uses for Biogas
There are a lot more uses for biogas than electricity and vehicle fuels - in fact these are second last and last uses on my list as they are inefficient, complex and expensive.
I think biogas should be used directly for cooking, lighting or heat if possible. Absorption refrigeration is also possible before using biogas to make electricity (probably to be used for one of the above purposes!). A Combined Heat and Power (CHP) or CoGenerator unit is a bit better use of biogas than simply running a generator. Paulharrisoz 04:55, 20 November 2006 (UTC) Paul Harris=
"Swamp gas" redirected here... so nothing about UFO sightings? -18.104.22.168 07:34, 1 March 2007 (UTC)
- I'm also rather confused by the current redirect of "Swamp gas" to this article. There seems to be no mention of naturally forming and occurring gasses associated with wetland environments such as hydrogen sulfide. If the redirect is to this article there should be information related to the redirect not just biofuel info.--Kevmin (talk) 07:18, 5 May 2009 (UTC)
- Redirecting Swamp Gas to this is, IMO, misleading and in error. There is nothing in this article about the composition, production, occurrence, or biological importance of swamp gas. 22.214.171.124 (talk) 07:38, 24 June 2009 (UTC)
- I totally agree. I searched "Swamp Gas" hoping to find information about gasses from actual wetlands. There's a whole history of scientists investigating the gasses from natural swamps, bogs and the like stemming from beliefs that they caused diseases like malaria. This has nothing to do with Biogas. An article should be created about swamp gas, or if this information exists in another article, Swamp Gas should redirect there.
Typical composition of Biogas
The table "Typical composition of Biogas" should explicitly state that the '%' listed is % volume (if it really is) and not some other % such as ppm, mol, mass...etc. It is typical throughout biogas literature to cite % without stating the basis of the % so one can only assume the % is volume. Assuming anything is dangerous when the numbers are used for scientific or engineering purposes.
I agree that it should specify % by volume. Also, a percentage range should be given. Landfill gas can be 40% methane or below, whereas I have seen brewery waste produce CH4 above 80%. H2S is typically between 1000 and 2000 ppmv, but can be as high as 30,000 ppmv in paper recycling waste. The highest I have seen from municipal waste is 12,000 ppmv. Varec (talk) 06:09, 26 June 2010 (UTC)
Hi, the reference number 11 to the bibilography (used for: "Landfill gas typically has methane concentrations around 50%. Advanced waste treatment technologies can produce biogas with 55–75% CH4") is not working. You can go to the page but you cannot download the report that gives the actual evidence. 126.96.36.199 (talk) 09:04, 13 June 2011 (UTC)
Siloxanes and thermophilic digestion
I know about biogas and it is a good fuel to use in farms. About siloxanes,the article is weak. I knew a biodigestor working for 30 years and without no problem.About Thermophilic digestion , the article is weakAgre22 (talk) 01:38, 12 September 2009 (UTC)agre22
I will try and come up with some text on siloxanes. Siloxanes vary a lot by the feed stock, as they are typically used in shampoos, so they would mostly only be seen in municipal waste. As for thermophillic, I don't know enough to add anything to the article, but hopefully someone will read this and take it up. There should be a discussion on the high gas production due to thermophillic digestion of grease. There should also probably be something on acid digesters. Varec (talk) 06:13, 26 June 2010 (UTC)
Hello people i'm new to this so bear with me, i have a question though, can you design a projet that inclues similarities and comparisons of biogas made from cow-dung and rotten plant materials? if so can you sweet people tell me where i can get that kind of information because i urgently need it for a maths and science project.....thank you by Ofentse a.k,a $hinto Vari. —Preceding unsigned comment added by Ofentse mmereki (talk • contribs) 13:27, 10 March 2010 (UTC)
- Hi Ofentse - I have moved your question to the bottom of this page, as Wikipedia (usually) works from top to bottom. I am not an expert on this subject, and it might be a while before someone who is visits this page. May I suggest asking at our Science Reference Desk instead? That page is regularly visited by many experienced Wikipedia editors, who should hopefully be able to give you some answers. Good luck! --Kateshortforbob talk 13:50, 10 March 2010 (UTC)
This is a bit of a red herring. Biogas has been around much longer than man. The history section refers more to harnessing biogas - or anaerobic digestion and I do not believe this is the correct article for it. Fine in anaerobic digestion, not for the gas.--Alex Marshall (talk) 10:22, 26 April 2011 (UTC)
This sentence is nonsensical
"In the UK, sewage gas electricity production is tiny compared to overall power consumption — a mere 1% of total UK gas demand. " Probably should read electrical demand instead of 'gas demand'.... can't check it because the reference page no longer exists online, an important deficiency whenever a web citation is being used as a reference. In addition, the web page appears to be a promotional page for policy makers, and so its veracity cant be assured. Yet another example of how not to cite information on Wikipedia. I have deleted it. ^ food and agricultural wastes.---------------http://www.claverton-energy.com/download/298/ Avram Primack (talk) 00:07, 7 November 2011 (UTC)
Biogas is not renewable
There is also the misconception in the page that biogas is a renewable resource. It is made by recycling and reusing other materials for more efficient extraction of its resource value before it is discarded. It does not replace itself (like a tree can if left alone long enough), nor is it reusable after it is burned, so it cannot be a renewable resource. Once the raw material is used it can be used for other activities (end product can be used as fertilizer or animal feed), but it cannot be used to make more biogas. Hence, it cannot be a renewable resource. Its creation is only a more efficient use of existing resources. Separate hype from reality in future please. Avram Primack (talk) 00:17, 7 November 2011 (UTC)
If swampgas is going to be routed to this page then there should be an explanation of what it actually is
Affect on rural and poor areas
Biogas, specifically that produced from dung and excrement, is becoming a new grassroots boon for people living in underdeveloped countries as a cheap fuel source with no drawbacks. Look at this journalist's article:
Reversion of large addition
I have reverted a large addition to this article.
- It is unduly focused on Poland for the purposes of this article, and would be more suited for a Biogas in Poland article.
- At least part of it is a copyright violation of , and the rest feels very similarly written and is likely copyvio (Google is not being helpful to finding other violations, as it can't find, for example "Currently, in the year 2010, on these data...").
- It was added by User:SEBE2013, who likely has a conflict of interest with http://tkm.sebe2013.eu/index.php/Main_Page and http://www.sebe2013.eu/home/about.
- On a minor point, there are many unfinished, empty sections, and while Wikipedia is always a work in progress, this will not do.