Going to ground: how used coffee beans can help your garden and your health



File 20180201 157495 1dbwul7.jpg?ixlib=rb 1.1
Coffee’s usefulness doesn’t have to end here.
Yanadhorn/Shutterstock.com

Tien Huynh, RMIT University

Did you know that your morning cup of coffee contributes to six million tonnes of spent coffee grounds going to landfill every year? This does not have to be the fate of your caffeine addiction and there are many opportunities to up-cycle spent coffee grounds into valuable commodities.

From fresh fruit, to roasted bean, to used up grounds, coffee’s chemical composition offers a range of uses beyond making your daily brew.




Read more:
Sustainable shopping: here’s how to find coffee that doesn’t cost the Earth


Potential applications range from biofuels, to health products, and fertiliser for farms or your garden. So why are we throwing this precious product away?

The answer is that processing and production can be more complex than you might imagine – even when we’re talking about simply using coffee grounds in your garden. What’s more, many recycling initiatives to turn waste coffee into valuable commodities are still in their early stages.

When composted properly, coffee can be an excellent fertiliser.
Author provided

You may have noticed that some cafes now offer free spent coffee grounds for customers to take home and use in the garden. In theory, this is a great initiative but the reality is that fresh coffee grounds are high in caffeine, chlorogenic acid and tannins that are beneficial to humans but toxic to plants.

The spent coffee must be detoxified by composting for a minimum of 98 days for plants to benefit from the potassium and nitrogen contained in the roasted beans. Without adequate composting, the benefits are scant (see below). So if you do take some coffee grounds home from your local cafe, make sure you compost them before sprinkling them on the veggie patch.

Parsley plants after 70 days in soil containing a) 21 days composted spent coffee; b) fresh spent coffee grounds; c) newspaper; d) soil only; and e) fertiliser.
Brendan Janissen, unpublished experimental results., Author provided

The good news is that properly composted coffee grounds offer a cheap alternative to agro-industrial fertilisers, potentially helping urban communities become greener and more sustainable. Savvy businesses have begun processing coffee grounds on a commercial scale, turning them into nutrient-rich fertilisers or soil conditioners in convenient pellets for use in the garden.

The coffee berries before harvest.
Author provided

But why stop there? A potentially even more valuable ingredient is the chlorogenic acid. Although toxic to plants, as mentioned above, chlorogenic acid has potential as a natural health supplement for humans, because of its antioxidant, anticancer and neuroprotective properties.




Read more:
Where’s that bean been? Coffee’s journey from crop to cafe


The whole coffee production process is abundant in chlorogenic acid, particularly in raw coffee beans. Chlorogenic acid conversion efficiency is even better from green coffee pulp, with a 50% recovery rate, compared with 19% for spent coffee grounds.

As undersized and imperfect beans are discarded at this raw stage, many businesses have seized the opportunity to market green coffee extracts as a weight loss product, although more research is needed to confirm this potential.

Roasted coffee beans ready for grinding.
Author provided

The list doesn’t end there. Coffee waste can be used to create a diverse list of chemicals, including enzymes and hormones for digestion of common biological compounds and to improve plant growth; and feedstocks for high-end crops such as mushrooms. Coffee oil has even been trialled as a fuel for London buses.

The ConversationWith abundant waste supplies due to the popularity of coffee consumption, by recycling the byproducts, perhaps we can enjoy one of our favourite beverages without too much guilt.

Tien Huynh, Senior Lecturer in the School of Sciences, RMIT University

This article was originally published on The Conversation. Read the original article.

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Australia: Great Barrier Reef


Pesticide Use a Threat to the Reef

The link below is to an article on Australia’s Great Barrier Reef and threat posed to it by the pesticide diuron being used within reach of the reef. A 3 month ban has now ended and spraying can resume with a number of restrictions imposed.

For more visit:
http://www.guardian.co.uk/environment/2012/mar/27/great-barrier-reef-australia-pesticides

Recycled Ink Cartridges to Build Bicycle Track in the West MacDonnell National Park


Here is a great recycling news story coming out of the Northern Territory in Australia – a 170km bicycle track is being built between Alice Springs and Simpson’s Gap in the West MacDonnell Ranges National Park, out of recycled plastics, including plastic from used printer ink cartridges. The bike track is a popular tourist destination in and around Alice Springs, so this upgrade is certainly a welcome one – especially given it that is being made out of recycled plastics. Full marks to the Northern
Territory government on this project – great news for all.

http://www.engadget.com/2010/06/13/recycled-ink-cartridges-used-to-build-bike-path-in-australian-na/

Visit Repeat Plastics Australia at:

http://www.replas.com.au/index.shtml

MYSTERY SOLVED: PLANE IS THAT OF STEVE FOSSETT


There is now more information on the story I posted yesterday regarding the disappearance of Steve Fossett at:

https://kevinswildside.wordpress.com/2008/10/02/steve-fossett-mystery-solved/

The wreckage discovered during the renewed search for Steve Fossett (following the discovery of several items belonging to Steve Fossett by a bushwalker) has turned out to be that of the missing Steve Fossett. Human remains have also been found in the wreckage with DNA testing to be used to confirm whether the remains are indeed those of Steve Fossett.