How can we best recover energy from mixed agriculture waste?
To recover Biogas from “Biomass” or agriculture waste and even energy crops,
became a success business in German in a very short time. Starting off with a
good governmental incentive support system EEG law in 2000 and 2004, to increase
renewable electrical energy to 36% (2018).
The EEG law encouraged many private investors (mostly farmers) to build and
operate biogas plants. Most farmers lag capital to finance a biogas plant. With
a loan based on the reliable return under stable operation conditions. Which
led to a biogas industry with most reliable stable operation. As a result 9500 biogas plants were built, who play an very important part in the renewable energy mix because compared to wind or solar, its 1.Independent
stable from light or wind.2. Easier
to storage for covering the peak hours, 3. Biogas is a multi-talent convertible
to different energies heat, fuel, cooling, electricity.
How did Germany /EU do this? By a combination of right support policies:
1. ONLY rewarding the output of the biogas plant
(Electricity/Bio-CNG/Heat/Cooling Energy). By this simple method private
investment went only into well operating biogas plants. Comparable to BOT model
for municipal waste treatment in China.
2.MUST integrate the liquid output to enable agriculture circular economy, by
using valuable liquid fertilizer and minerals back to direct surrounding
fields.
3. REASONABLE size of Biogas plants in EU (most >2MWel/h), because too
large scale plants become economic and ecologic polluting instead of useful. The
increasing transportation and logistic costs bringing in and out materials
eating up the benefits. For example the material collection and output
fertilizer distribution become too far, consuming more fuel than the recovered
renewable energy.
4. If animal manure is used for biogas production the EEG support is higher,
encourage to use lower efficient material for biogas. In China the high water
usage reduce the organic solid contend and makes dry AD biogas production
inefficient, even adding straw to the process.
5. Yearly reduction of the governmental incentive challenges the biogas plant
builder to become more efficient every year. Only the “fittest survive ” with
the top grade technology to deliver good returns to the operator and banks.
We offer the 'fittest system' survived under decreasing EEG support and
rising energy corps prices since 20 years. Squeezing out the last cent of
optimization and operation. Germany is full with 9500 plants, new plants are now
exported to other EU countries and so far with no possible returns in China.
Modern large scale farms in China are diluting their residues into the
ground, polluting more and more the ground water. Or the farms are forced to
treat their valuable organic fertilizer for very high cost in waste water
systems.
Result in China:
1. Mayor governmental biogas subsidy, (besides a too low electricity support)
is been lost into investment support, and mostly low operating biogas
technology.
2. Loss of valuable resources lead to inefficient agriculture and more
pollution in China
3. Just more chemical fertilizer is used, to further destroy fertile
agriculture land.
4. Useless expensive waste water treatment make milk production
inefficient.
5. Biofertilization for an increased sustainable value to the farmers with
organic food is lost.
Example: We built a 4 MW/h el. large biogas plant in 2018, for a 15.ooo
largest scale milking cow farm. Our high efficient system cannot even recover
our clients operation cost, due to an added waste water treatment system, eating
up all the profits gained by feeding electricity into the grid with about
0,65-0,75 Yuan/kWel. Local farmers can´t be encouraged to buy the valuable
produced organic fertilizer!
The Chinese biogas industry, suffering from the wrong policy over 10 years
now, to support a technology which can delivery sustainable high benefits to the
Chinese society. We hope for better changes in China and are ready to
support.