Mon, Jun 23, 2008 page11

• At Toyota's greenhouse, CO² is no sin

  BLOOMING MARVELS A new scheme is expected to help the Japanese auto giant to slash its CO² emissions by 460 tonnes a year and invigorate plants

  • AFP
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  In a sprawling greenhouse with shiny silver ducts running through, stacks of cardboard boxes feature prints of a flower alongside the distinctive red Toyota logo.

  In an experiment aimed at putting to use some of the carbon dioxide blamed for global warming, the giant auto group is using Asia’s largest greenhouse for potted flowers, stretching across 20,000m².

  “Nowadays you automatically think of C0² as a villain. But it’s what plants need to grow,” said Teruo Takatomi of Toyota Floritech Co Ltd.

  The system generates power by burning natural gas, with electricity used for lighting over plants, “waste” heat for warming water, and emitted carbon dioxide falling on plants to promote their photosynthesis.

  “You have gas emissions when you generate electricity. After removing nitrogen oxide from the gas, C0² is returned here for plants to inhale,” farm chief Takuya Sato said.

  The new system, introduced in March, is expected to help the company slash C0² emissions by a combined 460 tonnes a year, he said.

  The farm is the first large commercial facility in Japan to introduce a form of “trigeneration” system — production and use of three different resources from a single fuel, according to project partner Kansai Electric Power Co.

  The system comes along with a machine that provides high-oxygen water to help invigorate plant roots.

  “The point of the system is — let’s generate power and use the byproduct too, leaving almost nothing wasted,” said Hiroshi Teshima, of Kansai Electric.

  “People who grow plants say that C0² during winter is as effective as sunlight,” he said.

  Kansai Electric, Toyota Floritech and other firms spent ¥70 million (US$650,000) to install the system at the greenhouse on Japan’s main island of Honshu, which is a few minutes drive from a major nuclear fuel plant.

  Another ¥120 million was spent to switch the energy source from heavy oil to natural gas by building a satellite tower to store liquefied natural gas.

  “Agriculture of course absorbs C0² thanks to photosynthesis but we hope this system will help cut the gas further,” said Masao Ikoma, managing director at Kansai Electric.

  Toyota Floritech is a 50-50 joint venture between Toyota Motor Corp and Hakusan Co Ltd, a Japanese firm dealing with seeds and seedling.

  The basic design of the automated farm came from Denmark. It employs only eight full-time, non-clerical employees who work in the greenhouse with support of 30 to 40 part-timers.

  Toyota Motor, reputed for its production efficiency, has helped the subsidiary but its expertise does not always apply to agriculture, the farm chief said.

  “We have received useful tips. For example, these lines,” Sato said, referring to white and yellow lines drawn on the floor showing what areas are for humans and for machines.

  He also said the auto giant had taught the farm to tidy things up in clearly labeled boxes to keep the manufacturing floor clean.

  “But we are handling living things. Life is very different from machines and components,” Sato said.

  “Supposing you are assembling a car, you wouldn’t miss the schedule even by one day. But it’s totally impossible to keep plants production precisely on time,” he said.
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