Estimation of biogas potential from livestock manure and its climate value for Cambodia

B.Sc. Ana del Carmen Garavito Sanjur

Master's thesis

Abstract:

The aim of this study is to estimate the greenhouse gases emissions (carbon dioxide, nitrous oxide and methane), from livestock manure from enteric fermentation and manure management when is handle without any treatment and the biogas potential of Cambodia, which could generate from livestock manure. For this reason, the greenhouse gas emissions (CO2, CH4, N2O) were calculated with the number of non-dairy cattle, buffalos, swine and chickens taking into account, which have more availability in the Cambodian households. Cambodia has in total 6,499,525 million of swine, 129,625, 285 million of chicken, 9,437,575 million of nondairy cattle, 1,427,375 million of buffalos. In total Cambodia has 146,989,760 million of livestock from swine, non-dairy cattle, swine and buffalos according to the 2013 Cambodia National Census. The total amount of manure produced is 1107 525. 06 kg is obtained for those animals. The total amount of CH4 emissions of enteric fermentation produced from those animals is 617.68 1 Gg CH4 yr-1 . The annual number of emissions of CH4 from manure management include the three livestock (non-dairy cattle, swine and poultry) is 2494.12 Gg CH4 yr. -1 and the total amount of N2O from manure management is 0.095 Gg N2O yr-1 . The biogas produced its was calculated through the 2019 refinement of the 2006 IPCC guidelines for greenhouse gases Inventories. The total biogas potential was calculated through IRENA, 2016 Methodology of feedstocks giving a value of 735.19 m3 / yr using country specific values of volatile solids for Asian countries this was equivalent to 16,174.18 MJ can use from livestock manure. The top animals that produce the higher amount of manure was non-dairy cattle, buffalos, swine and chicken. The Cambodia zone resulted to have the higher number of livestock, following by Plain Zone. Pailin was the province with the lowest number of livestock. The total amount of Greenhouse gases emissions of CO2 from CH4 enteric fermentation is 23392 Gg CO2 eq, the amount of CO2 emitted from manure management is the total amount of CO2 from CH4 manure management is 70.25 KgCO2. The total amount of CO2 from N2O manure management is 166.81 kg N2O. Biogas produces a lower amount of emissions compared to dung that produced 7100 Mg CH4 in comparison of biogas that produces 57 Mg CH4, 885 G CO2 od dung compared to biogas that produced 81.5 g CO2 and dung produced 290 mg N2O in comparison of biogas that produces 5.4 mg N20 showing the environment benefits to threat livestock manure through biogas that at the same time the fertilizer is rich in nutrients and less polluted when the manure is spread in the soil or storage in piles.

Keywords

Biogas Potential, manure management, enteric fermentation, IPCC, Greenhouse gas emissions, livestock manure

Language used: English

Date on which the thesis was submitted / produced: 6. 8. 2021

Thesis defence

• Supervisor: Ing. Hynek Roubík, Ph.D.

Czech University of Life Sciences Prague

Faculty of Tropical AgriSciences

Master programme:
Agri-food Systems and Rural Development