[Digestion] Digestion Digest, Vol 16, Issue 8 - BMP of Paper plus

Bill Rucks water.alchemy.ltd at clear.net.nz
Thu Dec 8 21:42:56 CST 2011


Greetings all 

I am looking for a BMP of paper  ? 

*         News paper 

*         Plane paper 

*         Paper mixed with human effluent 

*         Paper mixed with other material 

Any think would be good 

Regards  

 

Bill Rucks 

 

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Today's Topics:

 

   1. Re: dosing for crops (David)

 

 

----------------------------------------------------------------------

 

Message: 1

Date: Wed, 07 Dec 2011 13:46:26 -0800

From: David <david at h4c.org>

To: For Discussion of Anaerobic Digestion

            <digestion at lists.bioenergylists.org>

Subject: Re: [Digestion] dosing for crops

Message-ID: <4EDFDEB2.3010206 at h4c.org>

Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"

 

 

Les, all,

 

On 12/7/2011 2:59 AM, Les Gornall wrote:

> Wayne,

> 

> My first point of call for any fertiliser recommendations is 

> 'FERTILISER RECOMMENDATIONS'  otherwise known as RB209....

> 

> From memory trials in Egypt in sandy soils crops were compared from 

> digested and undigested manures for decades  (Halwagi et al).   The 

> digestate crop yield was 15% better than the undigested manure crop 

> yield after 15 years.  In other words the soil was improving as a 

> growing medium even in hot sandy soils.

 

I guess nothing ever dies in the Internet. Digital eternity?

 

I was interested in your mention of this, Les, and went spelunking, 

thus encountering the fragment below 

<http://www.repp.org/discussion/digestion/200002/msg00130.html>, also 

posted by you to this list, but a decade ago. Do forgive me therefore 

for quoting it-- your ideas may well have changed, etc.-- but I 

thought it was a useful addition to this discussion:

 

 

        There are very few long term experiments relating plant growth

        to the plant nutrients and micronutrients in digested vs

        undigested organic wastes. - Have you ever tried to get a

        grant for a 20 year research project?

 

        However, you should read :

 

        MOAWAD H., ZOHDY L.I., BADR EL-DIN S.M.S, KHALAFALLAH M.A.,

        ABDEL-MAKSOUD H.K., 1984, "Assessment of anaerobically

        digested slurry as a fertiliser and soil conditioner." in

        [El-] Halwagi ed. Proc.Int. Conf. State of the art on Biogas

        Technology Transfer and Diffusion, Cairo Nov. 17-24, Elsevier

        App.Sci. 499-519.

 

 

The above appears to be the reference which memory prompted you to 

cite, although perhaps it should be referenced as Moawad et al. You go on:

 

 

        Also Zohdy L.I. et al 1984, "Repeated application of

        anaerobically digested slurry and its effect on the yield and

        NPK uptake of wheat, turnips and onion plants." (also in

        Halwagi ed. above.)

 

        These workers found that whilst the annual difference in crop

        mass was greater for AD than unD manures, the difference was

        not significant statistically-- But the positive difference

        accumulated year on year for many years and so after 15 years

        you would expect almost 15% more crop mass.

 

        It seems to me that soils typically take 10,000 years to make

        and 100 years to destroy. The aim of using AD is that the

        decomposition of organic matter that would take place slowly

        in the soil is done quickly in the digester. The AD effluent

        is then used to rebuild the soil structure faster and more

        efficiently than it is being destroyed by the agricultural

        activity which itself depletes soil organics 100 times faster

        than nature can repair the losses incurred by agriculture.

 

        If we put undigested sludge on the soil the soil first has to

        grow the bacteria for decomposition and typical growth rates

        of bacteria in soil (in Northern Ireland) are one doubling per

        year as determined by soil respiration experiments (see the

        work of Prof. A. McFadden in the 1970's). There are also other

        losses from 'slurry spreading', nitrogen is lost, (bound up as

        microbial protein in AD effluent), clovers and nitrogen fixing

        plants are severely inhibited and earthworm populations fail,

        reducing recycling.

 

        It is a big subject and one that is severely underfunded

        academically.

 

 

 

 

 

d.

-- 

David William House

"The Complete Biogas Handbook" |www.completebiogas.com|

/Vahid Biogas/, an alternative energy consultancy |www.vahidbiogas.com

 

|

||

"Make no search for water.       But find thirst,

And water from the very ground will burst."

(Rumi, a Persian mystic poet, quoted in /Delight of Hearts/, p. 77)

 

http://bahai.us/

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