| Slurry
Liquid manure volume reduced by half
Efficient Slurry and Digestate Processing with „Kumac“ from WELTEC.
erman biogas
specialist WELTEC
BIOPOWER now
offers a proven
solution for the
processing of
slurry and digestate for livestock
owners and biogas plant
operators. The fully automated
processing system „Kumac“
reduces the liquid manure and
digestate volume by 50 percent. In
a four-stage procedure, clear
water, liquid fertiliser concentrate
and valuable solid matter are
extracted from the source material.
G
WELTEC BIOPOWER‘s
processing concept is equally
suitable for users from different
areas, such as pig and cattle
owners and biogas plant
operators
Regions characterised by
agriculture are faced with a high
accumulation of slurry and
digestate, while the areas suitable
for spreading the nutrients are
limited. In the future, restrictive
laws will impose even stricter
regulations for handling the
nutrient surplus. Against this
background, operators are finding
it more and more costly to store
and dispose of liquid manure and
digestate. WELTEC BIOPOWER‘s
Kumac processing system
represents a sustainable,
economic solution for reducing the
quantity, thereby improving the
transportability and volume of the
nutrient surplus.
The functional principle is based
on several tried and tested subprocesses, which, in combination
with custom developments, are
highly effective within the
framework of an overall process.
To separate the solid and liquid
matter in the first step, flocculants
are added to the liquid manure
and digestate. In this way, certain
nutrients are fixed, and it becomes
easier to separate the solid matter
from the liquid phase with the belt
filter press. Moreover, the additives
alleviate the odour emissions. The
drained solid matter has a dry
matter content of about 30 percent
and can be used as fertiliser,
compost or litter or, in the case of
42 | Farming Monthly | October 2016
slurry, as biogas feedstock.
Subsequently, the remaining
liquid phase is passed through a
flotation tank in order to separate
further small particles and
suspended matter. Any remaining
solid particles are removed by a
fine filter. In the next step, the
filtrate traverses a three-stage
reverse osmosis process in order
to concentrate salts and nutrients.
The resulting liquid fertiliser is rich
in nitrogen and merely accounts
for one quarter of the original
volume. The major portion of the
treatment products consists of
clear water (50 percent), which
can be introduced to the water
cycle after being processed in the
ion exchanger.
The scalable modular system
can be used from an amount of
50,000 t of slurry or digestate a
year. If the processing needs
increase, a combination of several
Kumac lines can easily be
implemented. However, Kumac
processing also excels with its
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