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Halophytes.Pdf Halophytes.qxp_feature.qxp 28/05/2014 12:28 Page 1 feedstocks Are salt-tolerant halophytes the answer to an aviation industry increasingly focused on renewable fuels? Charlotte Niemiec looks at this “game changer” in the biofuels industry and how an ecosystem could be put in place to make it even more sustainable as the biofuel problem finally been cracked? A team of scientists at the MASDAR Institute in Abu Dhabi firmly believes it has found the answer to indirect land use change (ILUC) concerns and food versus fuel debates in the form Hof halophytes. Unlike most plants, halophytes are salt tolerant. They can therefore be grown in arid places such as the desert and watered with sea water. They grow in saline water, such as saline semi-deserts, man - grove swamps, marshes and sloughs. There are thousands of species of halophytes – most of the plants on the beach are halophytes, for example – and they grow in most tropical and moderate cli - mate, are perennial and very hardy. Some species are edible, such as salicornia , which is currently marketed in the USA as a gourmet food product. It tastes like asparagus or green beans and contains salt. Halophytes do have natural predators, such as beetles, but these pests can be controlled by introducing spiders to the crop. Goats are also rather fond of halophytes as HALOPHYTES CONTAIN 30% OIL, ARE SALT TOLERANT AND CAN BE GROWN ON ARID LAND they can tolerate higher salt contents. Halophytes have other uses, too. They are excel - lent at cleansing the environment, decontaminat - ing soils, desalinating brackish waters and carbon sequestration. They have been put to the test in land remedia - tion; in 2007, hurricanes salinated soyabean fields, Halophytes: a biofuel b r rendering them barren. Scientists introduced a native species of salicornia into the fields, which produced usable crops of halophytes and desali - mance-based logistics and training. Biofuels top traditional fuels in the air nated the soil in the process. Boeing is part of the Sustainable Bioenergy In companion work with Professor Gallagher at Research Consortium (SBRC) and is a member of Morgan explains that biofuels are technically supe - the University of Delaware, a soyabean field fal - the Sustainable Aviation Users Group, formed in rior to kerosene, which took the aviation industry lowed by hurricane floodwaters was planted with September 2008 with support and advice from somewhat by surprise. This is because biological sea-shore marrow that produced useable seed, leading environmental organisations such as the sources lend themselves better to the creation of even in a dry season. The halophyte remediation National Resources Defense Council and the hydrotreated fuels – those devoid of oxygen – technology could also be applied to aquifer irri - Roundtable on Sustainable Biomaterials (RSB). which function better in plane engines. Tar sands gated land farms, which are becoming more sali - The group is focused on accelerating the develop - and shale crude oil contain contaminants that nated each year. ment and commercialisation of sustainable avia - interfere with aviation and create inefficiencies in There are numerous organisations investigating tion biofuels, including biofuels derived from the system, but mineral oils are cleaner. the potential of biofuel derived from halophytes, halophytes. Nevertheless, says Morgan, the problem for the with strong interest shown from the aviation Also partnered with the SBRC is the MASDAR industry is that aviation itself has a relatively small industry. Darrin Morgan, director of sustainable Institute of Science and Technology, the world’s carbon footprint, which makes investors reluctant aviation fuels at Boeing, explains in an interview first graduate-level university dedicated to provid - to invest in biofuels. with Zachary Shahan, director of the ing real-world solutions to issues of sustainability; A new path had to be found, which would not CleanTechnica website, how his company is Etihad Airways, the flag carrier airline of the utilise fresh water and expensive farmland as first- involved in these projects. Boeing is the world’s United Arab Emirates (UAE); Honeywell UOP (for - generation biofuels had done. It was also impor - largest aerospace company and is a leading manu - merly known as Universal Oil Products), a multi- tant not to create a fuel that required a change in facturer of commercial jetliners and defence, national company developing and delivering plant engines; the fuel had to fit the plane. space and security systems. It produces tailored technology to the petroleum refining, gas process - It is important to remember that (most) mod - services including commercial and military air - ing, petrochemical production and major manu - ern aircraft cannot run solely on biofuels. In an craft, satellites, weapons, electronic systems, facturing industries; and Safran, a leading interview by Sander Olsen with Dr Bilial Bomani, defence systems, launch systems, advanced infor - international high-technology group with three the head of NASA’s green lab research facility, mation and communication systems, and perfor - core businesses in aerospare, defence and security. Bomani explains: “The seals and fuelling systems 18 OFI – JUNE 2014, BIOFUELS ISSUE www.oilsandfatsinternational.com Halophytes.qxp_feature.qxp 28/05/2014 12:28 Page 33 feedstocks M it was more sustainable – and made solid financial Concluding, he states that halophytes are a O C . sense – to create a halophyte ecosystem by merg - “game changer for biofuels” and the “biggest A I D ing aquaculture with halophyte farms. breakthrough for biofuels ever”, relevant not just E P I K Aquaculture has come under fire for returning the to the aviation industry but everywhere. I W / fish waste it produces to the ocean, but the nutri - A C Replacing other renewable fuels I ents in this waste are exactly what halophytes need N I G to grow and make natural, non-chemical fertiliser. R I V In an interview with Dr Alejandro Rios, director How much land, then, would it take to fuel the A I N at the Bioenergy Research Consortium at MAS - entire aerospace industry? Bomani comments: “If R O DAR, he explained to Oils & Fats International we dedicated the land mass of Maryland to grow - C I L A that SBRC scientists were in the process of build - ing advanced algal technologies, along with halo - S : ing a lab-scale, pilot facility on two hectares of phyte optimisation, we could almost supply the O T land within Masdar city. The next step will be to entire aerospace industry in the USA. If we had the O H P create a test ecosystem on 200ha in western Abu land mass of the Sahara desert, we could meet the Dhabi. aviation fuel needs for the entire world using pri - The pilot facility will use grid energy but it is marily advanced halophyte plants. We are trying to hoped that, when the ecosystems are in place, the use under-utilised NASA land in Florida to grow energy produced by the halophyte farms will be halophytes. We actually see beach sand as our soil, used to power all infrastructure, making it a self- which normally has no nutrients. The beach sand sustaining system. gets its nutrients from the water below. With the The plants currently produce two tonnes of projection that the aerospace industry will grow seed/ha, which equates to 600-700 litres of oil. about four percent per year, currently fuelling With agricultural engineering, however, the team requirements – based on current aircraft designs – hopes to increase the yield up to four or five are expected to double by 2020.” tonnes of seed/ha. It is worth remembering, however, that the avi - Furthermore, the 40 tonnes/ha of biomass pro - ation industry accounts for just eight percent of duced, Rios says, contains “extremely interesting world oil consumption, according to IFFP Energies properties” such as chemicals and sugars that Nouvelles’ website, therefore it is questionable have attracted the interest of the pharmaceutical whether there is enough suitable, available land to and cosmetic industries. cover entire world oil use with halophyte-derived The halophyte ecosystem will use flood irriga - biofuel. tion in a similar way to that used in the growing of In terms of yields, halophytes are competitive rice. An engineered system will use gravity to irri - with soyabeans. In a paper written by R C gate the plants, which will be grown in the open Hendricks of the NASA Glenn Research Center in air rather than in greenhouses. Waste seawater Cleveland, Ohio, and D M Busnhell of the NASA from a fish and shrimp farm will nourish halo - Langley Research Center in Hampton, Virginia, phytes that clean the water as they grow. The titled ‘ Halophytes energy feedstocks: back to our water will next flow into a field of mangroves roots ’, published in February 2008, the authors before returning (cleansed) to the ocean. The pro - discuss the viability of halophytes as a biofuel feed - ject will investigate the scaleability and viability of stock. an integrated seawater energy and agriculture sys - They note that experimental farms yield tem, known as the ISEAS concept ( see Figure 1, 1.7kg/m 2/yr of total biomass and 0.2kg/m 2/year previous page ). of oil, similar to soyabean seed oil yields. To com - pare-the yield from soyabeans is about 19% oil and b reakthrough Commercially viable in just five years 48% protein. It produces 10.9lbs/bushel, 468lbs/acre or 61 gallons/acre of oil with an aver - But what is rather remarkable is how quickly these age crop of 43 bushels/acre. Halophyte seeds pro - of legacy aircraft aren’t designed for biofuels and systems could be put in place and producing com - vide 30% oil and yields are 0.2kg/m 2 (two will leak if loaded with pure biofuels. So, we have petitive biofuel.
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