[Gasification] AGT LTC process

Thu Dec 5 21:10:39 CST 2013

Thomas,

Results have been mixed. One “gasifier char” had very high PAH which affected crop performance. Unfortunately the source and conditions of production were not identified. 

>From Sarah Hale:

Quantifying the total and bioavailable polycyclic aromatic hydrocarbons and dioxins in biochars.

Hale SE <http://www.ncbi.nlm.nih.gov/pubmed?term=Hale%20SE%5BAuthor%5D&cauthor=true&cauthor_uid=22321025> , Lehmann J <http://www.ncbi.nlm.nih.gov/pubmed?term=Lehmann%20J%5BAuthor%5D&cauthor=true&cauthor_uid=22321025> , Rutherford D <http://www.ncbi.nlm.nih.gov/pubmed?term=Rutherford%20D%5BAuthor%5D&cauthor=true&cauthor_uid=22321025> , Zimmerman AR <http://www.ncbi.nlm.nih.gov/pubmed?term=Zimmerman%20AR%5BAuthor%5D&cauthor=true&cauthor_uid=22321025> , Bachmann RT <http://www.ncbi.nlm.nih.gov/pubmed?term=Bachmann%20RT%5BAuthor%5D&cauthor=true&cauthor_uid=22321025> , Shitumbanuma V <http://www.ncbi.nlm.nih.gov/pubmed?term=Shitumbanuma%20V%5BAuthor%5D&cauthor=true&cauthor_uid=22321025> , O'Toole A <http://www.ncbi.nlm.nih.gov/pubmed?term=O%27Toole%20A%5BAuthor%5D&cauthor=true&cauthor_uid=22321025> , Sundqvist KL <http://www.ncbi.nlm.nih.gov/pubmed?term=Sundqvist%20KL%5BAuthor%5D&cauthor=true&cauthor_uid=22321025> , Arp HP <http://www.ncbi.nlm.nih.gov/pubmed?term=Arp%20HP%5BAuthor%5D&cauthor=true&cauthor_uid=22321025> , Cornelissen G <http://www.ncbi.nlm.nih.gov/pubmed?term=Cornelissen%20G%5BAuthor%5D&cauthor=true&cauthor_uid=22321025> .

Source

Department of Environmental Engineering, Norwegian Geotechnical Institute NGI, PO Box 3930 Ullevål Stadion, N-0806 Oslo, Norway. Sarah.Hale at NGI.NO

Abstract

Biochar soil amendment is advocated to mitigate climate change and improve soil fertility. A concern though, is that during biochar preparation PAHs and dioxins are likely formed. These contaminants can possibly be present in the biochar matrix and even bioavailable to exposed organisms. Here we quantify total and bioavailable PAHs and dioxins in a suite of over 50 biochars produced via slow pyrolysis between 250 and 900 °C, using various methods and biomass from tropical, boreal, and temperate areas. These slow pyrolysis biochars, which can be produced locally on farms with minimum resources, are also compared to biochar produced using the industrial methods of fast pyrolysis and gasification. Total concentrations were measured with a Soxhlet extraction and bioavailable concentrations were measured with polyoxymethylene passive samplers. Total PAH concentrations ranged from 0.07 μg g(-1) to 3.27 μg g(-1) for the slow pyrolysis biochars and were dependent on biomass source, pyrolysis temperature, and time. With increasing pyrolysis time and temperature, PAH concentrations generally decreased. These total concentrations were below existing environmental quality standards for concentrations of PAHs in soils. Total PAH concentrations in the fast pyrolysis and gasification biochar were 0.3 μg g(-1) and 45 μg g(-1), respectively, with maximum levels exceeding some quality standards. Concentrations of bioavailable PAHs in slow pyrolysis biochars ranged from 0.17 ng L(-1) to 10.0 ng L(-1)which is lower than concentrations reported for relatively clean urban sediments. The gasification produced biochar sample had the highest bioavailable concentration (162 ± 71 ng L(-1)). Total dioxin concentrations were low (up to 92 pg g(-1)) and bioavailable concentrations were below the analytical limit of detection. No clear pattern of how strongly PAHs were bound to different biochars was found based on the biochars' physicochemical properties.

From: Gasification [mailto:gasification-bounces at lists.bioenergylists.org] On Behalf Of Thomas Koch
Sent: Thursday, December 05, 2013 3:06 PM
To: Discussion of biomass pyrolysis and gasification
Subject: Re: [Gasification] AGT LTC process

Are there anybody that have an idea of how much PAH biochar contains? 

Fra: Gasification [mailto:gasification-bounces at lists.bioenergylists.org] På vegne af darius_tamizi
Sendt: 5. december 2013 23:36
Til: Discussion of biomass pyrolysis and gasification
Emne: Re: [Gasification] AGT LTC process

We are very interested in feeding poultry with biochar. Anybody can give us more info?

Darius

Terkirim dari Samsung Mobile

-------- Original message --------
From: Tom Miles <tmiles at trmiles.com> 
Date: 06/12/2013 03:14 (GMT+07:00) 
To: 'Discussion of biomass pyrolysis and gasification' <gasification at lists.bioenergylists.org> 
Subject: Re: [Gasification] AGT LTC process 

IEA Task 33 country report (2012) by Reinhard Rausch gives the following information:

AGT Agency for Green Technology 

Ledererg 3 A-4861 Schoerfling 

E-mail: info at agt-world.com 

Web: http://www.agt-world.com 

Low Temperature Conversion (LTC) is a thermo catalytic decomposition process operating without air supply

There is a presentation that is not too informative. 

http://www.agt-austria.at/downloads/AGT_DL3_072011.pdf

You might contact the company and Reinhard at Vienna University of Technology. 

Tom

From: Gasification [mailto:gasification-bounces at lists.bioenergylists.org] On Behalf Of Don Murray
Sent: Thursday, December 05, 2013 11:03 AM
To: gasification at lists.bioenergylists.org
Subject: [Gasification] AGT LTC process

Ref: AGT -  Agency for Green Technology, Austria

Process: LTC low temperature conversion gasification

Is someone familiar with this technology - process? What is progressive thermal catalytic material gasification?

Do we have here a pyrolysis reactor front-end; followed by a gasifier processing the char and the pyrolysis gases?

Thank you for any insight.

Don Murray, ing.

EMISPEC

Parc Techno du Québec Métropolitain

2750 rue Einstein, suite 390

Québec, G1P 4R1

Canada

www.emispec.ca

off: +1 418 266 0308

skype: emispec-don.murray

de la fibre au  <https://picasaweb.google.com/108399800724959588615/DropBox?authuser=0&feat=directlink> kWh ...

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