Top Above Header

Thermophilic Anaerobic Digestion

thermophilic graphic for anerobic digestion pageWhat is Thermophilic Anaerobic Digestion?

It is all about temperature. Anaerobic digestion (AD) will take place at any temperature above about 10 degrees C, but only very slowly. Over the years research has established that there are two temperature ranges which are the most efficient for biogas production using the normal bacteria and other synergstic organisms which contribute, which are the most efficient for the process and for biogas production.

Those two temperature ranges are known as the mesophilic and the thermophilic temperature ranges. The mesophilic is the cooler range, and the thermophilic range is the hotter one.

According to Wikipedia:

“A thermophilic digester or thermophilic biodigester is a kind of biodigester that operates in temperatures above 50 °C producing biogas. …In fact, it can be as much as six to ten times faster than a normal biodigester.”

For most digester feed materials, both mesophilic and thermophilic anaerobic processes will work. Mesophilic digesters (33-35 °C) are normally designed for retention time of 20-30 days, while operation in the thermophilic range (53-55°C) enables the retention time to be as low as 10-12 days.

Advantages of Thermophilic

Advocates of thermophilic digestion (or thermophilic biodigestion) give several advantages over the more common mesophilic anaerobic digestion temperature range, such as better sludge quality and higher biogas production.

In our experience those benefits vary according to the type of material which is digested. Municipal Solid Waste lyses (breaks down within the cells) relatively easily when compared with, for example, sewage sludge. So, while thermophilic anaerobic digestion is becoming the norm for sewage sludge, it is unlikely that the additional sacrificial burden on heating the reactor will be worthwhile for MSW AD in most cases.

The hydrolysis stage of the AD process is widely regarded as a rate-limiting step in sludge digestion, thus improvements in hydrolysis rates which occur naturally at higher temperatures have the potential for significant improvements in overall apparent sludge digestion rates. Therefore, many “optimized” thermophilic reactors operate right at the top of the thermophilic temperature range. At this point the naturally occurring methanogenic bacteria begin to be come less efficient, so any further increse in temperature tends to reduce efficency and not raise it.

Improvements in the rate of the AD process, at thermophilic temperatures, have beneficial knock-on effects as they also lower mixing energy requirements, maintenance of mixing equipment, and overall heat loss per unit volume of material processed which also reduces costs. But, more energy is consumed to raise the temperature initially, and for high rates of throughput this can be significant.

Also, when a reactor is initially commissioned from cold on a new site, the entire reactor must be heated to the higher thermophilic temperature range largely using “bought in power”, normally from the local electricity provider, adding to the initial invetsment needed to start-up a new biogas plant installation.

Thermophilic anaerobic digestion can offer higher biogas production, more complete volatile organics destruction and pathogen destruction.

Some researchers have reported that they have been able to reduce the hydraulic retention time (HRT) from a necessary 15 to 20 days in mesophilic digestion down to as little as 3 days at a thermophilic temperature in the region of (55°C) with stable fermentation and methanogenic activity. That is an illustration of just how much an effect the temperature of an AD plant reactor can have, but for reliance on the lowest possible hydraulic retention time any AD facility developer would need to be very confident in their ability to keep the system stable in operation as there would be very little time to react if the eractor started to experinece problems. Loss of reactor uptime while high rate reactors can be teased back into full health, can be very costly and all decisions on optimizing throughput need to balance economy of initial capital spend, and robustness in plant operation throughout its life.

Dry Anaerobic Digestion

50 Responses to Thermophilic Anaerobic Digestion

  1. Christine Crawford December 31, 2014 at 5:01 pm #

    Looking forward to reading more. Good info. Will read on…

  2. George Campbell March 13, 2017 at 1:13 am #

    Hello Web Admin, I noticed that your On-Page SEO is is missing a few factors, for one you do not use all three H tags in your post, also I notice that you are not using bold or italics properly in your SEO optimization. On-Page SEO means more now than ever since the new Google update: Panda. No longer are backlinks and simply pinging or sending out a RSS feed the key to getting Google PageRank or Alexa Rankings, You now NEED On-Page SEO. So what is good On-Page SEO?First your keyword must appear in the title.Then it must appear in the URL.You have to optimize your keyword and make sure that it has a nice keyword density of 3-5% in your article with relevant LSI (Latent Semantic Indexing). Then you should spread all H1,H2,H3 tags in your article.Your Keyword should appear in your first paragraph and in the last sentence of the page. You should have relevant usage of Bold and italics of your keyword.There should be one internal link to a page on your blog and you should have one image with an alt tag that has your keyword….wait there’s even more Now what if i told you there was a simple WordPress plugin that does all the On-Page SEO, and automatically for you? That’s right AUTOMATICALLY, just watch this 4minute video for more information at. Seo Plugin

  3. Barbara Marshall March 13, 2017 at 5:26 pm #

    Hello Web Admin, I noticed that your On-Page SEO is is missing a few factors, for one you do not use all three H tags in your post, also I notice that you are not using bold or italics properly in your SEO optimization. On-Page SEO means more now than ever since the new Google update: Panda. No longer are backlinks and simply pinging or sending out a RSS feed the key to getting Google PageRank or Alexa Rankings, You now NEED On-Page SEO. So what is good On-Page SEO?First your keyword must appear in the title.Then it must appear in the URL.You have to optimize your keyword and make sure that it has a nice keyword density of 3-5% in your article with relevant LSI (Latent Semantic Indexing). Then you should spread all H1,H2,H3 tags in your article.Your Keyword should appear in your first paragraph and in the last sentence of the page. You should have relevant usage of Bold and italics of your keyword.There should be one internal link to a page on your blog and you should have one image with an alt tag that has your keyword….wait there’s even more Now what if i told you there was a simple WordPress plugin that does all the On-Page SEO, and automatically for you? That’s right AUTOMATICALLY, just watch this 4minute video for more information at. Seo Plugin

  4. Anne Barnes March 31, 2017 at 12:00 pm #

    Free Brisbane Sex Personals

    Romance advice and tips

    Local Singles

    Sex Dating Delight

    http://adultdatingbrisbane.com/
    http://datingice.com/
    http://rhdating.com/
    http://sexdatingdelight.com/

  5. Nicholas Alexander April 3, 2017 at 7:32 am #

    Hello Web Admin, I noticed that your On-Page SEO is is missing a few factors, for one you do not use all three H tags in your post, also I notice that you are not using bold or italics properly in your SEO optimization. On-Page SEO means more now than ever since the new Google update: Panda. No longer are backlinks and simply pinging or sending out a RSS feed the key to getting Google PageRank or Alexa Rankings, You now NEED On-Page SEO. So what is good On-Page SEO?First your keyword must appear in the title.Then it must appear in the URL.You have to optimize your keyword and make sure that it has a nice keyword density of 3-5% in your article with relevant LSI (Latent Semantic Indexing). Then you should spread all H1,H2,H3 tags in your article.Your Keyword should appear in your first paragraph and in the last sentence of the page. You should have relevant usage of Bold and italics of your keyword.There should be one internal link to a page on your blog and you should have one image with an alt tag that has your keyword….wait there’s even more Now what if i told you there was a simple WordPress plugin that does all the On-Page SEO, and automatically for you? That’s right AUTOMATICALLY, just watch this 4minute video for more information at. Seo Plugin

  6. James Burns April 12, 2017 at 10:18 pm #

    acheter sildenafil en ligne
    acheter sildenafil citrate

  7. Eric Holmes April 12, 2017 at 10:37 pm #

    acheter viagra en ligne livraison 24h
    acheter viagra livraison gratuite

  8. Clarence Miller April 12, 2017 at 10:42 pm #

    acheter viagra pas cher en france
    viagra en ligne france pas cher

  9. Sharon Bailey April 12, 2017 at 10:57 pm #

    achat viagra en ligne france
    achat viagra en pharmacie

  10. Laura Evans April 13, 2017 at 2:15 am #

    viagra sans ordonnance en pharmacie
    viagra sans ordonnance quebec

  11. Joshua Dixon April 13, 2017 at 2:24 am #

    sildenafil pfizer prix
    sildenafil pfizer 50 mg

  12. Carl Simmons April 13, 2017 at 2:30 am #

    viagra pas cher livraison rapide
    viagra pas cher generique

  13. Teresa Taylor April 13, 2017 at 2:37 am #

    viagra en vente libre au quГ©bec
    viagra en vente libre en france

  14. Roger Black April 13, 2017 at 2:44 am #

    viagra pfizer gГ©nГ©rique prix
    viagra gГ©nГ©rique prix en pharmacie

  15. Robin Wilson April 13, 2017 at 5:36 pm #

    cialis 10mg prix en pharmacie en ligne
    cialis 10mg prix en pharmacie en ligne

  16. Stephen Martinez April 13, 2017 at 5:46 pm #

    acheter cialis generique moins cher
    cialis generique pas cher

  17. Philip Diaz April 13, 2017 at 6:08 pm #

    medicament cialis 20mg prix
    cialis 20 mg prix pharmacie

  18. Bruce Richardson April 13, 2017 at 11:09 pm #

    acheter cialis en france sans ordonnance
    acheter cialis en france livraison rapide

  19. Richard Barnes April 13, 2017 at 11:28 pm #

    cialis sans ordonnance en belgique
    cialis sans ordonnance en pharmacie belgique

  20. Steve West April 14, 2017 at 4:07 am #

    achat cialis site fiable
    acheter cialis site fiable

  21. Kelly Morales April 14, 2017 at 5:08 am #

    acheter cialis sans ordonnance en pharmacie
    acheter du cialis sans ordonnance

  22. Philip Washington April 14, 2017 at 5:18 am #

    acheter cialis 5mg en ligne en france
    acheter cialis generique en france

  23. Carolyn Gibson April 14, 2017 at 5:34 am #

    acheter cialis 20mg en ligne
    cialis 20mg vente

  24. Janice Walker April 14, 2017 at 5:37 am #

    achat cialis 5mg en ligne
    achat cialis 5mg en france

  25. Lawrence Hunt April 14, 2017 at 4:17 pm #

    tadalafil prix en pharmacie
    cialis prix en pharmacie quГ©bec

  26. Heather Carter April 14, 2017 at 4:29 pm #

    acheter tadalafil 20mg pas cher
    acheter cialis 20mg en ligne en france

  27. Julia Campbell April 14, 2017 at 4:35 pm #

    acheter cialis 20mg pas cher
    cialis 20mg pas cher paris

  28. Keith Jenkins April 14, 2017 at 9:17 pm #

    acheter tadalafil en france
    achat cialis en france

  29. Anne Hamilton April 14, 2017 at 9:54 pm #

    ou acheter du cialis sans ordonnance en france
    acheter tadalafil sans ordonnance

  30. Sara Allen April 15, 2017 at 12:54 am #

    acheter propecia generique
    achat propecia generique

  31. Jeremy Burns April 15, 2017 at 12:57 am #

    achat cialis 10mg
    acheter cialis 10 mg

  32. Sara Dixon April 15, 2017 at 1:21 am #

    achat tadalafil france
    acheter tadalafil en france

  33. Keith Murphy April 15, 2017 at 1:21 am #

    acheter prednisone
    acheter prednisone 20 mg en ligne

  34. Ralph Hamilton April 15, 2017 at 1:28 am #

    acheter propecia sur internet
    acheter propecia sur internet

  35. Beverly Adams April 15, 2017 at 1:48 pm #

    achat propecia partnership
    achat propecia par carte bancaire

  36. Kelly Evans April 15, 2017 at 3:01 pm #

    acheter finasteride sans ordonnance
    acheter finasteride 1mg

  37. Joshua Garcia April 15, 2017 at 3:40 pm #

    acheter amoxicilline 1g en ligne
    acheter amoxicilline 1g

  38. Elizabeth Reynolds April 15, 2017 at 3:43 pm #

    peut acheter clomid sans ordonnance
    acheter du clomid sans ordonnance

  39. Joseph Smith April 15, 2017 at 3:56 pm #

    amoxicilline acide clavulanique prix maroc
    amoxicilline 1g prix maroc

  40. Sandra Henderson April 15, 2017 at 10:41 pm #

    ventoline sans ordonnance achat
    ventoline sans ordonnance acheter en ligne

  41. Theresa Lewis April 16, 2017 at 12:16 am #

    acheter ventolin 4mg
    acheter ventolin spray sans ordonnance

  42. Annie Porter April 16, 2017 at 1:52 am #

    acheter ventoline spray
    acheter ventoline pharmacie

  43. Rose Wright April 16, 2017 at 2:44 am #

    achat ventoline sans ordonnance
    achat ventoline sur internet

  44. John Gomez April 16, 2017 at 4:21 pm #

    where can i buy viagra online cheap
    where can i buy viagra in manila

  45. Kathryn Adams April 16, 2017 at 4:31 pm #

    how to get viagra without a doctor prescription
    how to get viagra without a doctor in india

  46. Jeffrey Stewart April 16, 2017 at 6:50 pm #

    vardenafil prix en pharmacie a caen
    prix levitra vardenafil

  47. Philip Wright April 16, 2017 at 7:30 pm #

    acheter zithromax sur internet en france
    acheter zithromax en ligne

  48. Denise Allen April 16, 2017 at 8:06 pm #

    how to get viagra pills in india
    how do i get viagra pills

  49. Sandra Henderson April 21, 2017 at 4:34 am #

    levitra prix en pharmacie france
    levitra generique prix en pharmacie

  50. Albert Stevens April 26, 2017 at 9:58 am #

    Hi there, simply turned into aware of your blog through Google, and located that it is really informative. I am gonna be careful for brussels. I’ll be grateful if you proceed this in future. Many people might be benefited out of your writing. Cheers!

Leave a Reply