IES84939Y1 - A process for producing a fertiliser - Google Patents
A process for producing a fertiliserInfo
- Publication number
- IES84939Y1 IES84939Y1 IE2007/0841A IE20070841A IES84939Y1 IE S84939 Y1 IES84939 Y1 IE S84939Y1 IE 2007/0841 A IE2007/0841 A IE 2007/0841A IE 20070841 A IE20070841 A IE 20070841A IE S84939 Y1 IES84939 Y1 IE S84939Y1
- Authority
- IE
- Ireland
- Prior art keywords
- mix
- fertiliser
- organic waste
- calcium oxide
- waste
- Prior art date
Links
- 239000003337 fertilizer Substances 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000010815 organic waste Substances 0.000 claims abstract description 76
- 235000019749 Dry matter Nutrition 0.000 claims abstract description 16
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium;oxygen(2-) Chemical class [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 10
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium monoxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 106
- 239000000292 calcium oxide Substances 0.000 claims description 51
- 239000010881 fly ash Substances 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 7
- 230000001419 dependent Effects 0.000 claims description 4
- 230000036962 time dependent Effects 0.000 claims description 2
- 239000002699 waste material Substances 0.000 abstract description 33
- 235000019735 Meat-and-bone meal Nutrition 0.000 abstract description 26
- 244000144977 poultry Species 0.000 abstract description 10
- 239000000203 mixture Substances 0.000 description 56
- 230000001131 transforming Effects 0.000 description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 239000007787 solid Substances 0.000 description 7
- 230000003019 stabilising Effects 0.000 description 7
- 235000015097 nutrients Nutrition 0.000 description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 6
- 239000011574 phosphorus Substances 0.000 description 6
- 229910052698 phosphorus Inorganic materials 0.000 description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 5
- 239000011575 calcium Substances 0.000 description 5
- 229910052791 calcium Inorganic materials 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 241000196324 Embryophyta Species 0.000 description 4
- 239000005864 Sulphur Substances 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N potassium Chemical group [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 4
- 239000011591 potassium Substances 0.000 description 4
- 229910052700 potassium Inorganic materials 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 241000273930 Brevoortia tyrannus Species 0.000 description 3
- 239000002956 ash Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 239000011573 trace mineral Substances 0.000 description 3
- 235000013619 trace mineral Nutrition 0.000 description 3
- 238000007792 addition Methods 0.000 description 2
- 235000019658 bitter taste Nutrition 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006011 modification reaction Methods 0.000 description 2
- 235000018102 proteins Nutrition 0.000 description 2
- 102000004169 proteins and genes Human genes 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000003760 tallow Substances 0.000 description 2
- 240000000218 Cannabis sativa Species 0.000 description 1
- NEFBYIFKOOEVPA-UHFFFAOYSA-K Dicalcium phosphate Chemical compound [Ca+2].[Ca+2].[O-]P([O-])([O-])=O NEFBYIFKOOEVPA-UHFFFAOYSA-K 0.000 description 1
- 235000019739 Dicalciumphosphate Nutrition 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 235000021120 animal protein Nutrition 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229940038472 dicalcium phosphate Drugs 0.000 description 1
- 229910000390 dicalcium phosphate Inorganic materials 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003864 humus Substances 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000009376 nuclear reprocessing Methods 0.000 description 1
- 235000021231 nutrient uptake Nutrition 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- 229940072033 potash Drugs 0.000 description 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
- 235000015320 potassium carbonate Nutrition 0.000 description 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D3/00—Calcareous fertilisers
- C05D3/02—Calcareous fertilisers from limestone, calcium carbonate, calcium hydrate, slaked lime, calcium oxide, waste calcium products
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F1/00—Fertilisers made from animal corpses, or parts thereof
- C05F1/005—Fertilisers made from animal corpses, or parts thereof from meat-wastes or from other wastes of animal origin, e.g. skins, hair, hoofs, feathers, blood
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F3/00—Fertilisers from human or animal excrements, e.g. manure
Abstract
ABSTRACT The present invention relates to a process for producing a fertiliser from a mix comprising at least one source of activated calcium oxide and organic waste. The organic waste has a dry matter content of greater than 65 percent and compri ses greater than 70 percent by weight of the mix. The organic waste could be any of meat and bone meal (MBM), green waste, poultry waste or mushroom waste. The invention further relates to the fertiliser produced.
Description
A process for producing a fertiliser
Introduction
The present invention relates to a process for producing a fertiliser from a mix
comprising at least one source of activated calcium oxide and organic waste. The
invention further relates to the fertiliser produced.
It is well known to produce fertilisers from a source of activated calcium oxide (CaO)
and organic waste. PCT publication no. WO 2004/069770 discloses a process for the
production of a fertiliser from a dry mix comprising fly ash and organic waste, wherein
the organic waste comprises between 30% and 70% by weight of the dry mix.
Although a significant amount of organic waste can be transformed into fertiliser by
this process, due to the changing technical requirements in the specification of certain
types of organic waste such as meat and bone meal, it is now necessary to be able to
use a higher proportion of organic waste in order to produce a suitable fertiliser.
One of the recent changes in meat and bone meal processing in Ireland is that most of
the tallow fat present in meat and bone meal is being removed as part of the drying
process. The main reason for this removal is that tallow is now considered to be a
high value product, and thus has uses in other production processes. The effect of
this however is that the resultant meat and bone meal has a lower energy value and
thus a higher portion of meat and bone meal is required to produce a fertiliser of the
same standard.
Additionally, due to the excessive amount of organic waste produced annually there is
a need for a process for producing a fertiliser which can utilise higher percentages of
organic waste.
Previous attempts however to incorporate higher percentages of organic waste in
fertiliser production have resulted in fertilisers with only partially transformed organic
waste which are unsuitable for further use. Thus there is a need for a process for
producing a fertiliser using a higher percentage of organic waste which allows more of
the organic waste to be transformed into fertiliser during processing.
Statements of Invention
According to the invention there is provided a process for producing a fertiliser from a
mix comprising at least one source of activated calcium oxide and organic waste;
characterised in that;
the mix comprises greater than 70% organic waste by weight of the mix,
and the organic waste has a dry matter content of greater than 65%, the
process comprising:
obtaining the organic waste and determining the average temperature
thereof;
mixing the organic waste with the at least one source of calcium oxide so
as to provide a dry mix having a total calcium oxide content in the region
of between 1% and 10% by weight, wherein the amount of calcium oxide
required is dependent on the temperature of the organic waste;
adding to the dry mix between 2% and 6% water by weight to activate the
total calcium oxide and to form the mix;
allowing the temperature of the mix to increase; and
storing the mix for a residence time dependent on both the temperature of
the organic waste and the amount of total calcium oxide in the mix to
transform the mix to fertiliser while allowing the fertiliser to cool to a
temperature of less than 25°C.
It has been found that there is a relationship between the temperature of the organic
waste, the total amount of activated calcium oxide and the residence time that the mix
must be stored for in order to allow transformation into fertiliser. It is therefore possible
to use this relationship to allow a higher percentage of organic waste to be
incorporated into the mix for transformation to a fertiliser. Specifically, more rapid
transformation of the mix into fertiliser occurs by using wami to hot organic waste.
This allows a reduction in the amount of activated calcium oxide necessary to induce
transformation. In the specification, the term “transformation” refers to an exothermic
chemical reaction between mixed ingredients which results in the alteration of the
properties of one or more of the ingredients within the mix. In the specification, the
term “by weight" refers to the weight of the fertiliser unless otherwise specified.
A further advantage is that organic waste is readily available commercially in a warm
state i.e. fresh from drying. Previously, the organic waste was cooled prior to
reprocessing, however now that it has been found that it more advantageous to use
the organic waste in its warm state; this obviates the cooling step and thus reduces
costs. A still further advantage of the process of the invention is that as the fertiliser is
stored and allowed to cool gradually, maximum transfonnation of the mix to the
fertiliser will occur and there is no longer a need to provide a cooler. This has an
obvious cost advantage. The storage residence time can also be easily modified to
suit the requirements of the processor.
As the resultant fertiliser is produced from such a high content of nutrient bearing
organic waste this has the associated advantage that the resultant fertiliser will have a
high nutrient value and thus will be a more effective fertiliser. For example, if the
organic waste is meat and bone meal, the resultant fertiliser will have a high nutrient
value of at least 2.5% available phosphorus, at least 2.5% slow release bound
phosphorus and at least 4% nitrogen.
The advantage of adding water to the dry mix is that it is free water and thus activates
the total calcium oxide in the mix, resulting in transformation of the mix into fertiliser.
Ideally, the source of calcium oxide comprises one or more of fly ash having a calcium
oxide content in the region of up to 50% by weight of the fly ash and pure calcium
oxide. The advantage of using fly ash is that it is in itself a waste product, and thus
this process is also a useful process for converting another low value waste product
into a high value commodity. A further advantage of using fly ash is that it is an
unpalatable substance. Fly ash is a high alkaline product with a bitter taste, thus when
fly ash is used as a source of calcium oxide to produce the fertiliser, it increases the
unpalatability of the fertiliser thus also increasing the edibility prevention thereof.
Therefore due to its bitter taste, it is unlikely that any animal would eat the fertiliser.
Preferably, the fly ash comprises between 12% and 40% calcium oxide by weight of
the fly ash. The advantage of the fly ash having a higher amount of calcium oxide is
that less pure calcium oxide will be required to achieve the recommended total
calcium oxide content for transformation. Further preferably, the amount of fly ash
and/or calcium oxide added is such as to provide a total calcium oxide content of
between 3% and 8% by weight.
Preferably, the temperature of the organic waste is between 10°C and 55°C. Further
preferably, the temperature of the organic waste is between 20°C and 40°C. The
advantage of the organic waste having a higher temperature which results in a thermal
residue is that due to the relationship between organic waste temperature, total
amount of activated calcium oxide and storage residence time, either the amount of
calcium oxide or residence time can be reduced depending on the requirements of the
processor. Either option will lead to a cost reduction without the loss of transformation
standards.
Ideally, the organic waste has a dry matter content of greater than 80% and preferably
greater than 92%. Generally, higher dry matter contents are as a result of a decrease
in the moisture content due to the drying process.
Preferably, the mix comprises between 80% and 95% organic waste by weight of the
mix.
Further preferably, the organic waste is selected from the group comprising one or
more of meat and bone meal, green waste, poultry waste and mushroom waste.
Ideally, the residence time is between 3 and 12 days.
Preferably, the fertiliser has a dry matter content of greater than 75%.
Further preferably, the process also comprises pelleting or prilling the fertiliser.
According to the invention, there is further provided a fertiliser prepared from a mix
comprising at least one source of activated calcium oxide and organic waste;
characterised in that;
the mix comprises greater than 70% organic waste by weight of the mix, and the
organic waste has a dry matter content of greater than 65%.
Detailed Description of the Invention
The invention will be more clearly understood from the following description thereof
with reference to the accompanying drawing wherein:
Fig. 1 is a process for producing a fertiliser according to the present invention.
Referring to Fig. 1 there is provided a process for producing a fertiliser indicated
generally by the reference numeral 1 comprising a plurality of hoppers for organic
waste 2, fly ash 3, and calcium oxide 4, identified by the numerals 5, 6 and 7
respectively. The hopper 5 containing the organic waste 2 also comprises a
thermometer (not shown) for detennining the average temperature of the organic
waste.
The hoppers 5, 6 and 7 feed a mixing station 8 which thoroughly mixes the organic
waste 2, fly ash 3 and Calcium oxide 4 to form a dry mix 9. A discharge outlet 10
feeds the dry mix 9 into an enclosed stabilisation chamber 11. Water 12 is sprayed
into the stabilisation chamber 11 through a water infusion spray 13 and the water 12 is
mixed with the dry mix 9 to form a mix 14. Oxygen in the form of air enters the
enclosed stabilisation chamber 11 by an air inlet 15. An auger 16 carries the mix 14
through the chamber 11 allowing the exothermic reaction to take place and the
temperature of the mix 14 to increase to form a partially transformed fertiliser 17.
A further discharge outlet 18 feeds the partially transformed fertiliser 17 into storage
containers 19 where the partially transformed fertiliser 17 is maintained to allow full
transformation into fertiliser while allowing the fertiliser to cool.
The mixing station 8, and the stabilisation chamber 11 may comprise a paddle mixer,
a revolving drum or an auger and a continuous auger has been found to be most
convenient. The fertiliser may be used directly or may be further stored in bunkers or
wind rows not shown if desired. The fertiliser may also be further processed at a
pelleting or prilling station.
Although Fig. 1 shows the premixing of the organic waste, fly ash and calcium oxide to
form a dry mix, in the mixing station, it will be appreciated that all of these components
can be added separately to the stabilisation chamber and mixed together there. It will
further be appreciated that although the process can be carried out in an enclosed
stabilisation chamber with an air/oxygen inlet as shown in Fig. 1 that it would also be
possible to carry out the process in an open top mixer, thus force-feeding of oxygen or
air is not essential to the process.
The organic waste may be any of meat and bone meal, green waste, poultry waste, or
mushroom waste. Meat and bone meal (MBM) is a product of the rendering industry
and is also now commonly known as processed animal protein (PAP). MBM Typically
comprises about 20% to 55% protein, 38% to 60% ash, 0% to 12% fat and 0% to 8%
moisture however these ratios vary with different MBM manufacturing and extraction
processes. The fertiliser produced from the MBM will generally have a high calcium
content and thus a pH in the region of 7. In the specification the term “green waste”
refers to biodegradable waste that can be comprised of garden or park waste such as
grass or flower cuttings and hedge trimmings, leaves shrubs, plants and tree
trimmings and waste from fruit and food processing generally. The green waste will
generally have a lower calcium content and thus will provide a fertiliser having a lower
pH of generally in the region of between 4.5 and 5.5. The use of poultry waste
provides a fertiliser with a high nitrogen content. Thus the type of fertiliser required
can be tailored for a particular use by varying the type of organic waste employed.
The temperature of the organic waste can be determined by any suitable means and
is largely dependent on the residual heat of the organic waste. In the specification the
term “residual heat” refers to heat acquired during the drying or composting process.
The temperature can also be modified by any suitable means if necessary.
The total CaO is provided by the fly ash and pure CaO. Although the process would
also work by the addition of pure CaO only, fly ash is also used as a partial source of
CaO as it is a waste product. The fly ash is the non-combustible residue that results
from burning fuels in an incinerator, boiler or furnace. Fly ash produced from the
burning of peat comprises the highest calcium oxide content of between 8% and 45%
by weight of the fly ash, and thus is most suitable for this invention. The calcium oxide
in its pure form is added to make up any shortfall in the amount of calcium oxide
provided by the fly ash.
Activated calcium oxide is defined as any calcium oxide which has reacted with free
water and which has the ability to react with organic waste to transform it into fertiliser.
Free water is water which is not bound to any other material and is thus easily
available for reaction.
The mix prepared to form the fertiliser generally comprises between 70% and 95%
organic waste, between 7% and 15% fly ash and between 2% and 7% pure calcium
oxide by weight of the mix. The amount of total calcium oxide required is dependent
on the temperature of the organic waste at the time of mixing. The efficiency of the
transformation of the mix to fertiliser is greatly improved and is much more effective
when the fly ash and calcium oxide and water are mixed with wann organic waste
having a thermal residue. Thus the temperature of the organic waste affects the
amount of total calcium oxide required and also affects the storage residence time.
Table 1 indicates some variations in the amount of CaO and residence time required
depending on the temperature of the MBM.
Table 1: Dependency of MBM (PAP)* temperature, amount of CaO, and
residence time
Storage MBM Fly Active Cao Pure Total Ca0 Total Fly
residence (PAP) Ash in Fly ash CaO (kg) ash +
time inflow (kg) (kg) (kg) Pure CaO
(days) Temp (°C) (kg)
17.5 - 23.1 12.5 30 — 35.6 82.5
4 45 80 20.0 — 26.4 12.0 32 — 38.4 92.0
4 40 90 22.5 — 29.7 12.5 35 - 42.2 102.5
4 35 90 22.5 - 29.7 12.5 35 — 42.2 102.5
100 25.0 — 33.0 7.0 32 — 40.0 107.0
25 110 27.5 — 36.3 17.5 40 — 53.8 127.5
6 20 120 30.0 — 39.6 20.0 50 — 59.6 140.0
8 15 140 35.0 — 46.2 20.0 55 — 66.2 160.0
10 150 37.5 — 49.5 25.0 62.5 — 74.5 175.0
*In all cases the % dry matter of the MBM (PAP) was 92% to 100%, the total content
of the dry mix was 1 tonne.
Due to the relationship between organic waste temperature, amount of CaO and
storage residence time each process can be tailored to suit the requirements of the
processor.
In the stabilisation chamber, once the calcium oxide is activated by the addition of free
water, the activated CaO will interact with the organic waste in the mix which leads to
partial transformation of the mix into fertiliser. As this transformation reaction is an
exothermic reaction, the temperature of the mix will initially increase. During storage
(bunkering) the active CaO will continue to interact with the protein and mineral
particles in the organic waste until the mix has generally been transformed into
fertiliser. For example, part of the phosphorus present in the organic waste will be
converted to dicalcium phosphate during processing. The temperature will gradually
subside until it reaches the approximate temperature of the storage area.
The extent of temperature increase will vary and depend on essential process
parameters such as organic waste temperature and amount of CaO. It has been
found however that the temperature of the transforming mix will generally increase to
greater than 30°C.
It is possible to store the transforming mix/fertiliser in one storage container (bunker)
for the complete residence time. Alternatively, the transfonning mix/fertiliser can be
transferred to different bunkers throughout the storage residence time.
Optionally, further nutrients or trace elements can be added to the fertiliser either in
the mixing or prilling station. One such nutrient is potassium containing potash which
is beneficial in the growth of crops. Trace elements which could optionally be added
include magnesium. manganese, zinc, copper and sulphur.
Example 1: MBM as organic waste source
MBM having a dry matter content of 99% was obtained and the average temperature
of the MBM was detennined as being 40°C. The MBM was mixed with fly ash and
calcium oxide in the ratio 8521223 to form a dry mix. 3% water by weight was added to
the dry mix to activate the total calcium oxide and to form a mix. The temperature of
the mix was allowed to increase to 50°C and the mix was stored for 4 days to allow
the mix to transform into fertiliser.
The components of the MBM and resultant fertiliser are compared in Table 2.
Table 2: Components of MBM and fertiliser produced using MBM
Component MBM (%) Fertiliser (%)
Dry Matter 99.00 97.80
Components within dry matter:
Nitrogen 6.97 6.45
Phosphorus (available and bound) 6.39 5.51
Potassium 0.17 0.18
Calcium 21.99 28.03
Sulphur 0.07 0.31
Other non—volatile solids 3.11 7.02
Volatile solids 60.30 50.30
Moisture 1.00 2.20
Example 2: Green waste as organic waste source
The fertiliser was produced as outlined in Example 1 with green waste as the organic
waste source and with the following additional modifications as tabulated in Table 3.
Table: 3 Components and processing conditions
Parameter
Green Waste 75%
Fly ash 24% by weight of dry mix
by weight of dry mix
lcium Oxide 1% by weight of dry mix
Water 3%
°C
by weight
Temperature of green waste
Increased temperature
Storage time
The components of the green waste and resultant fertiliser are compared in Table 4.
Table 4: Components of green waste and fertiliser produced using green waste
Component \ Green Waste (%) \ Fertiliser (%)
Dry Matter \ 65.00 ‘i‘30.oo
Components within dry matter:
Nitrogen 3.71 2.60
Phosphorus (available and bound) 4.31 3.60
Potassium 0.36 0.59
Calcium 0.66 5.59
Sulphur 0.07 0.54
Other non-volatile solids 22.59 26.88
Volatile solids 33.30 40.20
Moisture 35.00 20.00
Example 3: Poul_t_ry waste as organic waste source
The fertiliser was produced as outlined in Example 1 with poultry waste as the organic
waste source and with the following additional modifications as tabulated in Table 5.
Table: 5 Components and processing conditions
Parameter Value
Poultry Waste 95% by weight of dry mix
Fly ash 0% by weight of dry mix
Calcium Oxide 5% by weight of dry mix
Water 5% by weight
Temperature of green waste 50°C
Increased temperature 54°C
Storage time 3 days
Table 6: Components of poultry waste and fertiliser produced using poultry
waste
The components of the poultry waste and the resultant fertiliser are compared in Table
Component Poultry waste (°/o) Fertiliser (%)
Dry Matter 67.00 82.00
Components within dry matter:
Nitrogen 6.48 6.00
Phosphorus (available and bound) 3.80 3.60
Potassium 0.14 0.17
Calcium 12.13 17.38
Sulphur 0.04 0.59
Other non-volatile solids 2.99 8.17
Volatile solids 41.42 46.09
Moisture 33.00 18.00
As indicated in the above examples, the fertiliser produced by the process of the
invention is rich in plant nutrients. The non-volatile solids include other trace elements
such as magnesium and manganese. The resultant fertiliser has been found to be
both useful in plant growth and the regeneration of clay structure. The fertiliser of the
invention has also been found to increase the humus level in the soil which greatly
assists the soil nutrient uptake and water stability in times of low rain fall and
maximum plant stress.
in the specification the terms “comprise, comprises, comprised and comprising” or any
variation thereof and the terms “include, includes, included and including" or any
variation thereof are considered to be totally interchangeable and they should all be
afforded the widest possible interpretation and vice versa.
The invention is not limited to the embodiment hereinbefore described, but may be
varied in both construction and detail within the scope of the claims.
Claims (5)
1. A process for producing a fertiliser from a mix comprising at least one source of activated calcium oxide and organic waste; characterised in that; the mix comprises greater than 70% organic waste by weight of the mix, and the organic waste has a dry matter content of greater than 65%, the process comprising: obtaining the organic waste and determining the average temperature thereof; mixing the organic waste with the at least one source of calcium oxide so as to provide a dry mix having a total calcium oxide content in the region of between 1% and 10% by weight, wherein the amount of calcium oxide required is dependent on the temperature of the organic waste; adding to the dry mix between 2% and 6% water by weight to activate the total calcium oxide and to form the mix; allowing the temperature of the mix to increase; and storing the mix for a residence time dependent on both the temperature of the organic waste and the amount of total calcium oxide in the mix to transform the mix to fertiliser while allowing the fertiliser to cool to a temperature of less than 25°C.
2. A process for producing a fertiliser as claimed in claim 1, wherein the source of calcium oxide comprises one or more of fly ash having a calcium oxide content in the region of up to 50% by weight of the fly ash and pure calcium oxide.
3. A process for producing a fertiliser substantially as described hereinbefore with reference to the accompanying examples and drawing.
4. A fertiliser prepared from a mix comprising at least one source of activated calcium oxide and organic waste; characterised in that; the mix comprises greater than 70% organic waste by weight of the mix, and the organic waste has a dry matter content of greater than 65%.
5. A fertiliser substantially as described hereinbefore with reference to the accompanying examples and drawing.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBUNITEDKINGDOM17/11/20060622961.1 |
Publications (2)
Publication Number | Publication Date |
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IE20070841U1 IE20070841U1 (en) | 2008-05-28 |
IES84939Y1 true IES84939Y1 (en) | 2008-08-06 |
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