Life cycle analysis (LCA) was used to estimate the nonrenewable
primary energy requirement (GJ/GJ) and greenhouse gas emissions
(kg CO2 eq./GJ bioenergy) for produced bioenergy in four scenarios
(Fig. 1). Scenario 1 consists of (a) anaerobic digestion of dairy
waste, (b) algal biodiesel production using effluent from [a], (c)
anaerobic digestion of algal biomass left after lipid extraction
and recycling of nutrients to the step [b], (d) application of solid
fraction from step [a] and [c] on the agricultural field. Scenario 2
consists of step [a] to [c] of scenario 1, sludge from step [a] and
[c] was processed through pyrolysis and biochar generated from
pyrolysis was applied on the agricultural land. Scenario 3 is similar
to scenario 1, but, instead of applying sludge on the agricultural
field, sludge was enzymatically hydrolyzed and used for algal biodiesel
production (data used for enzymatic hydrolysis and algal
biomass production are given in Table 1). Residue remaining after
hydrolysis was applied on the agricultural field as a soil amendment.
In scenario 4, in addition of all the processes applied for scenario
3, pyrolysis was used to process residue from enzymatic
hydrolysis and produced biochar was applied on the agricultural
land as a soil amendment.
Life cycle analysis (LCA) was used to estimate the nonrenewableprimary energy requirement (GJ/GJ) and greenhouse gas emissions(kg CO2 eq./GJ bioenergy) for produced bioenergy in four scenarios(Fig. 1). Scenario 1 consists of (a) anaerobic digestion of dairywaste, (b) algal biodiesel production using effluent from [a], (c)anaerobic digestion of algal biomass left after lipid extractionand recycling of nutrients to the step [b], (d) application of solidfraction from step [a] and [c] on the agricultural field. Scenario 2consists of step [a] to [c] of scenario 1, sludge from step [a] and[c] was processed through pyrolysis and biochar generated frompyrolysis was applied on the agricultural land. Scenario 3 is similarto scenario 1, but, instead of applying sludge on the agriculturalfield, sludge was enzymatically hydrolyzed and used for algal biodieselproduction (data used for enzymatic hydrolysis and algalbiomass production are given in Table 1). Residue remaining afterhydrolysis was applied on the agricultural field as a soil amendment.In scenario 4, in addition of all the processes applied for scenario3, pyrolysis was used to process residue from enzymatichydrolysis and produced biochar was applied on the agriculturalland as a soil amendment.
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