[Terrapreta] sewage sludge charcoal

[Folke Günther]

Sorry, but you still have the HEAP trap there if yu don’t spread he ash/char
on the same land as was used to produce the feed to the animals.

 

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Folke Günther

Kollegievägen 19

224 73 Lund, Sweden

home/office: +46 46 14 14 29

cell:               0709 710306  skype:  folkegun

Homepage:     http://www.holon.se/folke  
blog: http://folkegunther.blogspot.com/

 

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Från: Tom Miles [mailto:tmiles at trmiles.com] 
Skickat: den 14 april 2008 06:31
Till: 'Folke Günther'; terrapreta at bioenergylists.org
Ämne: RE: [Terrapreta] sewage sludge charcoal

 

Folke,


Thank you for an excellent description. Since 1990 there has been work in
Japan on charring sewage sludge which so far has not turned up toxic
concentrations of pollutants such as heavy metals in the low temperature
char. 

 

We see the same mechanisms of Phosphorous concentration in the concentrated
animal feed operations, or CAFOS. We developed a method of burning poultry
litter to recover phosphorous-rich ash for feed and potassium-rich ash for
fertilizer. Charring litter may make more sense. So far we have seen no
results from the much advertized poultry  litter pyrolysis projects in
Virginia and elsewhere. 

(eg http://terrapreta.bioenergylists.org/knightpoultry )

 

Tom

 

 

From: terrapreta-bounces at bioenergylists.org
[mailto:terrapreta-bounces at bioenergylists.org] On Behalf Of Folke Günther
Sent: Sunday, April 13, 2008 3:42 PM
To: terrapreta at bioenergylists.org
Subject: Re: [Terrapreta] sewage sludge charcoal

 

See: http://terrapreta.bioenergylists.org/guntherheap0408 

 

I was refraining from this, since  I don’t think it is an item really
belonging to the TP list, but now we are here.

 

1.	Urine
<http://www.holon.se/folke/kurs/Distans/Ekofys/Recirk/Eng/urin_en.shtml>
and faeces
<http://www.holon.se/folke/kurs/Distans/Ekofys/Recirk/Eng/fekalier_en.shtml>
are excellent plant food. The reason we don’t use them directly is mostly
cultural for the urine, I guess, but for faeces it is really an adaptive
behaviour. Burning or charring cold be a good idea for faeces. The charring
might make it sterile, and the non-gaseous nutrients, as phosphorus, would
be returned to land, for a future production of new food. A large pat of the
faeces is indigestible cellulose, why it could be a good thing to char it.
The urine, which normally is sterile at the production site, could enrich
charcoal very well.
2.	Currently, the westernized wastewater behaviour  is base on the
MIFSLA
<http://www.holon.se/folke/kurs/Distans/Ekofys/Recirk/Eng/mifsla_en.shtml>
(Mix First and Separate Later) philosophy This results in a mixture of high
nutrient – high pathogen – high toxic – high water content mixture that is
almost mpossible to do something sensible with. Commonly, it is thrown away
into the nearest lake or sea, where the harm it does is not immediately
evident. On the other hand, avoiding the MIFSLA with a source-separating
<http://www.holon.se/folke/projects/vatpark/Septoa_en.shtml>  toilet is
really easy, if you don’t live on the 21st floor and is forced to use the
system, either you want it or not.
3.	Living in dense communities (e.g. towns or cities) put another
invisible restriction on you: As you use the MIFSLA system, you put the used
nutrients on a smaller area than the food production area. It is like
filling a glass of beer, when the glass is full, he leakage will equal the
import. Normally, you stop the beer-filling process then, but you can not
stop eating. It will end up in a steady state, which I call the HEAP
<http://www.holon.se/folke/kurs/Distans/Ekofys/Recirk/Eng/heap_en.shtml>
trap.

I will add a ppt, trying to explain the HEAP effect and its cultural
background.

 

YS

FG

 

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Folke Günther

Kollegievägen 19

224 73 Lund, Sweden

home/office: +46 46 14 14 29

cell:               0709 710306  skype:  folkegun

Homepage:     http://www.holon.se/folke  
blog: http://folkegunther.blogspot.com/

 

  _____  

Från: terrapreta-bounces at bioenergylists.org
[mailto:terrapreta-bounces at bioenergylists.org] För Philip Small
Skickat: den 9 april 2008 18:08
Till: terrapreta at bioenergylists.org
Ämne: [Terrapreta] sewage sludge charcoal

 

Jim:

On Wed, Apr 9, 2008 at 8:26 AM, Jim Joyner <jimstoy at dtccom.net> wrote:

I know human waste has carbon in it, but would char made from this be the
same as char made from woody material. I mean, is all char equal? 

No. Woody is best from several perspectives. 

It would seem that all TP had been made with char from wood, right?

I am thinking that household waste was included in the original TP feed
stock 

Obviously eliminating toxicity from waste is a good idea but might never
happen. 

Not all toxic substance are equal. 

Given whatever level of toxicity, would it not be better to combined in
char? 

Depends on specifics. 

Where does sludge go that doesn't get put on fields?

Ocean dumping is cheapest (Vancouver BC) and still quite popular.
Landfilling is next, assuming community has abundant capacity. Material that
can't be land applied is incinerated and the ash landfilled. Composting is
popular but can be problematic. 

Least-industrial sludge is household septage. I work with that also.  It is
not as polished biologically. My preference is to see septage run through a
treatment plant to get the putrescible index (my made up term)  of the
material down to a more neighborly level, but the BOD load can put a
significant burden on plant capacity.  Fees can reflect this, thus a very
expensive alternative for the septage hauler. Land app of septage after
adding hydrated lime is a normal practice in many communities.


-Phil


 

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