Feasibility of biodiesel production and CO2 emission reduction by Monoraphidium dybowskii LB50 under semi-continuous culture with open raceway ponds in the desert area

Yang, Haijian; He, Qiaoning; Hu, Chunxiang

doi:10.1186/s13068-018-1068-1

Biotechnology for Biofuels and Bioproducts

Table 5 Comparative energy analyses for biomass or bio-oil production based on 1 year of cultivating M. dybowskii LB50 via different culture modes under OPRs

From: Feasibility of biodiesel production and CO₂ emission reduction by Monoraphidium dybowskii LB50 under semi-continuous culture with open raceway ponds in the desert area

Variable	5 m²			200 m²
Variable	Batch	Induction	Semi-continuous	Batch	Semi-continuous
Annual biomass production (kg year⁻¹)	100,000	100,000	100,000	100,000	100,000
Volumetric productivity (g L⁻¹ day⁻¹) or (kg m⁻³day⁻¹)^a	0.04	0.04	0.07	0.08	0.09
Illuminated areal productivity (kg m⁻² day⁻¹)^a	0.01	0.01	0.01	0.02	0.02
Reactor volume (m³)^b	8413.68	8504.49	5513.10	4700.13	4087.97
Occupied area (m²)	42,087.54	42,522.43	27,557.32	23,500.66	20,439.87
Lipid content (%)^a	30.85	39.39	30.84	30.13	30.13
Energy consumption for stirring (W m⁻³)^c	3.72–12.5	3.72–12.5	3.72–12.5	3.72–12.5	3.72–12.5
Total energy for stirring (kWh months⁻¹)^d	7511.7–25,241.1	7592.8–25,513.4	4922.1–16,539.3	4196.2–14,100.3	3649.7–12,263.9
Total energy for biomass drying (kWh year⁻¹)^e	53,900.00	53,900.00	53,900.00	53,900.00	53,900.00
Total energy for oil recovery (kWh year⁻¹)^f	34,534.00	34,534.00	34,534.00	34,534.00	34,534.00
Total energy consumption for producing biomass	437.42–1011.85	440.05–1020.68	353.52–729.91	330–650.89	312.29–591.39
Total energy consumption for producing oil (GJ year⁻¹)	561.74–1136.17	564.37–1145	477.84–854.24	454.32–775.22	436.61–715.71
Energy produced as oil (GJ year⁻¹)^g	1204.3	1537.8	1203.9	1176.3	1176.3
Energy produced as 100,000 kg biomass (GJ year⁻¹)^h	3155.33	3155.33	3155.33	3155.33	3155.33
NER for oil productionⁱ	2.14–1.06	2.72–1.34	2.52–1.41	2.59–1.52	2.69–1.64
NER for biomass production	7.21–3.12	7.17–3.09	8.93–4.32	9.56–4.85	10.1–5.34
Energy consumption for oil (MJ kg⁻¹ bio-oil)	17.86–36.13	14.06–28.52	15.2–27.17	14.79–25.24	14.22–23.3
Energy consumption for oil (MJ MJ⁻¹ bio-oil)	0.47–0.94	0.37–0.74	0.4–0.71	0.39–0.66	0.37–0.61

The assumed annual biomass production is 100,000 kg
^aData were based on this study
^bDetermined by dividing the illuminated area actual by production the volume of each unit
^c3.72 W m⁻³ from Jorquera et al. [23]. 12.5 W m⁻³ from the actual date for the 200 m² raceway pond
^dIncludes 8 h of daily pumping
^eStepan et al. [52]. 539 kWh ton⁻¹ biomass
^fStephenson et al. [53]; Gao et al. [54]. 345.34 kWh ton⁻¹ biomass
^gEnergy content of net oil yield (assumed value of 39.04 MJ kg⁻¹); Jorquera et al. [23]
^hEnergy content of net biomass yield (assumed value of 31.55 MJ kg⁻¹); Jorquera et al. [23]
ⁱNER would be above 1 if including coproduct allocation [55]

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ISSN: 2731-3654

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