processed materials

Poultry manure

Poultry manure treatment

Poultry manure is an organic fertilizer obtained from recycling for the industrial treatment of poultry farm excrements. Due to its chemical characteristics, it is functionally located in an intermediate position between organic fertilizers and chemical fertilizers. there are two categories of effluents: laying hen and litter of poultry.

The residual organic matrices used as raw material for feeding the electric and thermal energy production plant, through a pyrolytic process, are characterized by the following parameters:

  • percentage of humidity.
  • lower calorific value of the sample of the matrix used.
  • percentage content of organic substance.

The direct use of manure in the field can have phytotoxic effects, but above all it is problematic due to the increase in salinity in the soil immediately after administration. The high content of mineral type nitrogen (ureic and ammoniacal) makes this organic material more prerogative than a chemical fertilizer. In fact, the manure is subject to a rapid mineralization which, in the case of conspicuous administrations, increases the concentration of the circulating solution and, consequently, the salinity of the soil.

The use of manure in the agronomic field thus differs markedly from that of the other organic fertilizers and fits into the following general lines:

  • administration at low doses, slightly higher than those generally adopted for a basic fertilization with chemical fertilizers;
  • administration at a relatively short disance from sowing, indicatively in correspondence with complementary processing.

The industrial treatment of the manure is necessary to break down the humidity and transform the product into a compound that is easy to manipulate. The exsiccation is carried out by rapid heating at high temperature or slow at low temperature, in order to bring the humidity to values ​​of the order of 10-15%.

The manure is treated to produce composts in large closed plants to avoid the emission of bad odors. Biological manure maturation takes 6 to 8 months. The energy valorisation of the treated organic fraction contributes to the reduction of greenhouse gas emissions and the data allow us to carry out a first technical-economic evaluation of the pyrolytic process. Further analyzes will have to be carried out in order to know the exact composition of this organic fraction in order to determine the syngas (combustible gas mainly consisting of hydrogen and carbon monoxide with small percentages of methane, ethane and propane) and char (carbon residue and inert) products. 

The organic fraction of feeding is characterized by the presence of carbon and hydrogen, which are the elements that provide the calorific power to the pyrolytic gas produced. With the data available, it can be stated that a pyrolysis plant with a rotating reactor, and an attached pyrolytic gas exploitation plant, will have a yield of not less than 60% as regards the pyrolytic gas production process starting from the raw material, and no less than 33% as far as the conversion of pyrolytic gas into electricity is concerned

WHAT IS OBTAINED FROM THE TREATMENT OF Poultry manure THROUGH THE PYROLYSIS PLANT?

For 200 Kg/h to be disposed of, we have: 

Result (product fed: rgg-laying poultry manure)

  • Hidrocarbons (34kg) 17% 17%
  • Syngas (42kg) 21% 21%
  • Coal (71kg) 35.5% 35.5%
  • Water (53kg) 26.5% 26.5%

Result (product fed: poultry manure)

  • Hidrocarbons (14kg) 7% 7%
  • Syngas (40kg) 20% 20%
  • Coal (78kg) 39% 39%
  • Water (68kg) 34% 34%

ELECTRICAL ENERGY PRODUCTION


Syngas production is used to generate electricity through gas engines connected to alternators. The total hourly production of electricity is: 200 KWatts from gas engines for 8,000 hours a year, a production of around 1,600 MWatt will be obtained.

THERMAL ENERGY PRODUCTION


From the processing cycle a production of Thermal Energy is obtained which can be used for heating the farm. We obtain for each KWe 1.3 KCal / hour; from 200 KWe we have 260 KWt for 8,000 hours a year we will have a production of 2,000 MWt.

RECOVERED MATERIALS

WORKING CAPACITY

200

Kg/h

1.600

Yearly input (ton)

ELECTRICAL ENERGY PRODUCTION

200

KW/h

1.600

Yearly production (MWe)

THERMAL ENERGY PRODUCTION

260

KW/h

2.080

Yearly production (MWt)

COAL RECOVERY

70

Kg/h

560

Yearly production (ton)

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