Energy use in New Zealand agricultural production

Chudleigh, P. D.; Greer, Glen

doi:10.1016/0167-5826(84)90043-3

Cited by 1 publication

(1 citation statement)

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“…Essentially, this requires a mobile material storage bin with rotating discs at an aperture, kinetic energy imparted by the discs randomly sprays the particulate material onto the field. Approximately 21 kWh t −1 is required for a spreading density of 2.5 t ha −1 (Chudleigh and Greet, 1983), although this is substantially more than the 0.2 kWh t −1 quoted in ASAE (1999) or 0.5-1.5 kWh t −1 calculated from emission data in Lal (2004). Of course, this value will change with respect to spreading density.…”

Section: Application Of Silicates To Landmentioning

confidence: 94%

The potential of enhanced weathering in the UK

Renforth¹

2012

International Journal of Greenhouse Gas Control

190

191

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a b s t r a c tEnhanced weathering is the process by which carbon dioxide is sequestered from the atmosphere through the dissolution of silicate minerals on the land surface. The carbon capture potential of enhanced weathering is large, yet there are few data on the effectiveness or engineering feasibility of such a scheme. Here, an energy/carbon balance is presented together with the associated operational costs for the United Kingdom as a case study. The silicate resources are large and could theoretically capture 430 billion tonnes (Gt) of CO 2 . The majority of this resource is contained in basic rocks (with a carbon capture potential of ∼0.3 tCO 2 t −1 rock). There are a limited number of ultrabasic formations (0.8 tCO 2 t −1 rock) with a total carbon capture potential of 25.4 GtCO 2 . It is shown that the energy costs of enhanced weathering may be 656-3501 kWh tCO 2 −1 (net CO 2 draw-down, which accounts for emissions during production) for basic rocks and 224-748 kWh tCO 2 −1 for ultrabasic rocks. Comminution and material transport are the most energy intensive processes accounting for 77-94% of the energy requirements collectively. The operational costs of enhanced weathering could be £44-361 tCO 2 −1 ($70-578 tCO 2 −1 ) and £15-77 tCO 2 −1 ($24-123 tCO 2 −1 ) for basic and ultrabasic rocks respectively. Providing sufficient weathering rates full exploitation of this resource is not possible given the environmental and amenity value of some of the rock formations. Furthermore, the weathering rate and environmental impact of silicate mineral application to the land surface is not fully understood, and further investigation in this area is required to reduce the uncertainty in the estimated costs presented here.

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Section: Application Of Silicates To Landmentioning

confidence: 94%