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rce and temperature what properties are important to the gardener charcoal s chemical properties do vary with source and temperature in the opinion of this author the single most important quality of charcoal to the gardener is the ability to lower acidity also termed liming capacity or effective neutralizing power this is easily measured in an agricultural laboratory as calcium carbonate equivalent cce if you are growing acid loving plants you will want a charcoal with negligible cce and purportedly this is true of mulga acacia wood bamboo and pine needle derived charcoal if you are combating low soil ph and aluminum toxicity you will want a charcoal with substantial cce oak and maple hardwood charcoal appear to have substantial cce apparently amazonian hardwood derived charcoal shares this characteristic raising soil ph has been identified as biochar s most important contribution to influencing soil quality in the context of terra preta source 1 08 what temperature range is considered low temperature in the context of biochar the theoretical low end of the range approaches 120 deg c the lowest temperature at which wood will char reference thus the temperature at the pyrolysis front a more practical low end is to use the piloted ignition temperature of wood typically 350 deg c reference the theoretical high end between biochar and more traditional charcoal depends on the process and feedstock used but is seldom indicated in excess of 600 deg c this temperature range is more relevant to woody charcoal than to charcoal made from bamboo or other high cellulose fuels woody charcoal has an interior layer of bio oil condensates that microbes consume and is equal to glucose in its effect on microbial growth christoph steiner energy with agricultural carbon utilization eacu symposium june 2004 high temperature char loses this layer and consequently may not promote soil fertility as well source 1 09 can i substitute other forms of charcoal for biochar absolutely while the bio oil condensates in biochar definitely play a role in soil fertility charcoal without bio oil condensates has been demonstrated to produce excellent results it is normally advisable to avoid industrial charcoal briquettes because the binders used during manufacture can add undesirable constituents on the other hand briquette binder can be innocuous see below 5 08 for information on how to receive some standardized rice hull charcoal to conduct your own home research pot trials and compare your results with others 1 10 does charcoal break down in soil charcoal is highly stable however soil microbes do break it down although at a very slow rate more 1 11 where can i join in with this community of terra preta enthusiasts bioenergy lists terra preta the intentional use of charcoal in soils hypography science forums terra preta yahoo tech group biochar 2 0 how do i get biochar you can purchase charcoal from a biochar manufacturer you can purchase any of a wide range of charcoal products suitable for amending soil or you can make charcoal yourself hopefully when you do you can pick up the knack of making charcoal which retains that condensate goodness 2 01 where can i purchase biochar how much should i pay currently manufactured biochar is in short supply and is fully utilized for academic research projects best energies is purported to have a target price of aud 200 mg mg is the same as a metric tonne for agrichar this is equivalent to usd 0 06 lb and would be very competitively priced the alternative is to purchase charcoal safe for use in the soil which by broader definition can also be regarded as biochar in britain charcoal is widely available in nurseries in australia you can ocassionally buy redhead brand bamboo charcoal from supermarkets or small bags of horticultural charcoal much cheaper is to ask your charcoal bbq chicken shop for a 20 kg bag of mulga acacia species native to the australia bush country charcoal for about aud 30 about usd 0 30 lb this will need to be ground a little in a motar and pestle before use it is excellent mixed in rough chunks in native orchids potting mixes it purportedly has a ph of 6 0 so can be used on acid loving plants cowboy brand hardwood charcoal is available in the united states in 20 pound bags by the pallet about 600 pounds on sale individual 20 pound bags have been available for about usd 0 50 lb for larger amounts as in a shipping container consider coconut shell charcoal at times in mid 2008 available for less than usd 300 mg about usd 0 14 lb worth repeating it is normally advisable to avoid charcoal briquettes because the binders used during manufacture can add undesirable constituents 2 02 what can i grow to make my own charcoal in britain commercially available charcoal is made from fuel produced by coppicing as has been done in british forests for more than 2 000 years this is an ecologically sustainable use of forests and may contribute to the health and longevity of some british forests 2 03 can i burn to bones to make charcoal for my garden yes it appears that charcoal derived from bones along with charcoal derived from other types of food wastes was a component in terra preta de indio bones are an excellent source of phosphorus an element in limited supply in cellulosic charcoal initial impressions are that bone charcoal will have higher ash and cce see 1 07 than cellulose derived charcoal 2 04 how do i make my own charcoal colliers the world over normally use either a covered pit example or a covered mound earth kiln example to make charcoal this approach is about 10 to 15 efficient most gardeners will want to start with an easier method that works at a smaller scale home pyrolysis is pretty easy to accomplish and a simple burn barrel is a common starting point a bottom ventilated bottom lit burn barrel is a popular variation this usually involves a torch and snuff or douse routine this approach is about 5 to 10 example if you have some basic tools for cutting metal you can make barrel into a higher yielding kiln example no matter what technique you use to make charcoal choosing uniformly sized dry woody material produces the highest yields uniformity is one reason that colliers will routinely use coppiced hardwoods gases produced from dry feedstock is easier to flare a highly desireable feature flaring off the flammable smoke produced during charcoal production is a good practice for eliminating smoke as well as the methane ch4 produced see 2 09 and gases an alternative use of the smoke produced is to condense it and retrieve it more information returning this liquid to the biochar or using it alone can have a stimulating effect on soil biology source this liquid is comprised of hundreds of compounds ranging from thick tars to lighter alcohol phenol and acid compounds terms applied to this liquid are bio oil condensates creosote liquid smoke pyroligneous liquor pyrogenous acid and wood vinegar more information if you want to use the heat generated to cook with consider robert flanagan s biochar stove example1 video or folke günther s simple two barrel system the inner can in folke s system acts as a retort restricting the air supply to the target feed stock for the duration of the burn an outside heat source pyrolyzes the retort contents small openings in the retort allow wood gas to escape but restrict the flow of oxygen in retorts are capable of very high yield efficiency 2 05 what are some higher volume and more efficient approaches to making charcoal for the garden a large drum retort use a drum with a fairly tight lid place it on a stand over the hearth a common albeit questionable adaptation is to perforate the bottom of the drum to use the volatile gasses to fire the retort example the alternative is to run a piece of perforated pipe from the top of the drum to the firebox underneath example1 example2 example3 with the right fuel choice a large drum retort adapted to burn the smoke will not only have a higher overall yield it will also cut back dramatically on the smoke produced a masonry retort kiln check out the adam retort aka improved charcoal production system icps at 3 cubic meter capacity this is a tad too big to be considered a garden level option but maybe someone can come up with a smaller sub 1m3 capacity size if a smaller size can also achieve the 3m3 s 35 to 45 efficiency use the flare to help sustain the process and be modified to capture some wood vinegar it would be a huge boon to the individual biochar using gardener adding a pyrolysis gas burner to a wood gas stove inpired approach in a wood gas stove inspired approach see tlud page wide separation between the pyrolysis front and the charcoal accumulating upstrem from it and the flare is desireable for retaining the charcoal work on a passive double chimney configuration looks very promising 1 2 active systems also show great promise adding a fan to the primary intake is a fairly common adaptation to control the rate of gas production in the range needed to achieve flare more sophisticated approaches are being tried also for about usd 700 you can have an automated system that controls air supply to optimize combustion and minimize emissions it can control a damper or an appropriately sized variable speed fan that injects air into the pyrolysis gases this system is based on a bosch wide band sensor which monitors stack oxygen levels and offers feedback control vis a programable logic controller plc to maintain an excess air regime required for complete combustion if the geometry is right products of incomplete combustion will be minimized and negligable source 2 06 how do i make charcoal that achieves biochar structure and chemistry structure is a mostly of a function of the fuel type hardwoods are currently preferred in this regard but the understanding in this area is in flux the chemistry is better defined the burn process should be controlled to retain condensates the tools to achieve this in a home based setting are limited but also blessedly simple in all approaches it means restricting the air supply to slow the burn rate and achieve a low enough pyrolysis temperature that all the tars and volatiles produced don t gas off being willing to tolerate the inefficent combustion of smoke production even if only near the end of the burn certainly makes it easier to retain this volatile liquid component being willing to dowse or damping off the burn before it makes the transition from a wood gas fire to a coal gas fire also helps that can result in some brown char mixed in with the black char but when it comes to garden soil its all good 2 07 how much charcoal yield can i expect on a dry matter weight basis as well as an energy basis between 20 percent for a top lit updraft tlud gasifier with low superficial velocity source pdf and 60 percent for a retort under ideal conditions 40 percent is a reasonable goal sources needed 2 08 what refractory materials can i use to make a kiln a retort steel and or bricks nothing unusual really and can use readily available materials you can make a tlud esque design from standard 24 gauge snap lock black stovepipe the heat will tend to defeat the snap lock so use a couple of sheet metal screws or move up to welded seems one advantage of the snaplock is that you can join sheets to get a larger diameter steel cooking oil cans and oil jober drums are particularly adaptable for larger kilns brick becomes essential i ll see if i can dig up some information on designs and the refractory requirements of the brick and the mortar 2 09 what gases does pyrolysis produce the dominant combustible gases produced are carbon monoxide and hydrogen along with a small amount of methane ch4 a powerful ghg which comprises 2 3 of the produced gas carbon dioxide is also produced especially with higher fuel moisture content source flaring the producer gas eliminates the methane component more 2 10 how much heat does pyrolysis produce pyrolysis itself is endothermic thus requires an input of heat to be sustained heating value of the gas produced is 5 000 5 900 kj m³ source comparatively less than the heating value of natural gas 33 320 to 42 000 kj m³ source pdf it is still substantial 2 13 is charcoal worth more as a fuel than as a soil amendment this can certainly occur its value as a soil amendment is highest when it is used in small amounts for carrying inoculate or side dressing with starter fertilizer it is also of high value on those high value crops that are responsive to high fertilizer inputs a basic spreadsheet can help in evaluating this 2 14 is charcoal worth more as a fuel than its value for offsetting greenhouse gases maybe yes maybe no 3 0 what do i do with the charcoal once i ve made it you can use freshly made charcoal as is especially in small amount for larger amounts the choices are to crush screen add liquids add dry materials and to compost it photos 3 01 why would i need to prepare the biochar as opposed to applying it as is there are several reasons that might apply to your situation fresh charcoal is hydrophobic as well as reactive in terms of chemistry and nutrient profile it also may be dominated by a size fraction that is larger than desired for the specific application 3 02 what size should the biochar be finer is better from a soil and plant views but finer is worse from a dust control and air quality view considering that charcoal naturally degrades in soil to a fine size the level of effort exerted to make fine charcoal is really driven by the application sytem employed banding fine charcoal down the seed row will require fine sand grain sized particles but there is no fundamental reason to prevent incorporating gravel sized pieces 3 03 what are some ways to crush and screen biochar for crushing i am leaning to a mortor and pestle approach a 5 cm dia tree branch and something like a 20 liter bucket with a plywood insert in the bottom for screening i think a sloped screen works better than a horizontal screen for higher volumes 3 04 what can i do to make the biochar easier to crush wetting and drying it seems to help be aware that soaking separates the soluble ash largely responsible for the calcium carbonate equivalency cce the liming effect and the salinity which can be a net benefit to acidic soils crushing it with a little moisture in it helps to control dust without removing the soluble ash content 3 05 besides water what else can i soak the biochar in you would want to choose materials that would mitigate stalling see 5 04 compost tea miraclegro calculation fish emulsion urine more on urine 3 06 can i add biochar to compost yes this will help fill the biochar with biology and humic substances for the added benefit of odor control consider topping off each addition to the household kitchen scrap collector with a healthy layer of biochar 3 07 will biochar affect the compost process casual observation indicates that adding fine freshly made biochar may accelerate the composti...