Top 10 tips for composting in schools

Composting is a fantastic opportunity for communities to get together to create a greener environment.

Nowhere is this more valuable than in schools, where children can be taught skills that will last them a lifetime.

Composting enables people to take responsibility for their own waste and deal with it in the most environmentally-friendly way – onsite where it is produced – reducing the energy and cost required to transport it further afield for treatment.

 When people compost they become aware of how much waste they produce; as a result they tend to waste less and recycle more.

What is composting?

Composting is the natural process that occurs when insects, worms and micro-organisms break down organic waste (food scraps, garden waste, paper waste) into a nutritious substance – compost – that can be used to feed soil and plants.

By managing the composting process, we help the micro-organisms to thrive and produce compost faster.    

What are the benefits of composting?

Composting is one of the most worthwhile things you can learn. There are only a few rules, and you only have to learn them once – the laws of nature don’t change. This knowledge will serve you well through life.

Composting:

 * creates free nutrient-rich soil food for your own use

* retains moisture in the soil, so reduces the need for watering

* helps plants to grow stronger and healthier

* cuts the amount of waste sent to landfill or incineration

* reduces your carbon footprint

* has a positive impact on the environment

*  inspires children to become composters of the future

How to make it work

Compost bins are not ordinary bins; some degree of management is needed and there are a few golden rules to follow.

Experience has taught us to give composting communities the following advice:

  • At least one person/member of staff should have overall responsibility and check in on the composter every couple of days to prevent issues developing.
  • Ensure as many people as possible have access to an instruction manual so they get to know the three golden rules: the balance needed between materials; aeration; moisture levels.
  • In a school, composting should ideally be a whole-school project. For example, a lot of carbon-rich materials will be needed and it’s much easier if this can be stored in lidded containers so it’s ready for use. This can prompt fun activities such as cardboard tearing sessions. Children could also bring cardboard from home to get parents involved too.
  • To educate the whole school – staff as well as pupils – put up posters giving basic composting information for everyone who will be adding organic waste to the bin. We have A3 posters available for schools and groups, or children could design their own.  
  • Help everyone to understand that every time a caddy of food waste is added to a compost bin (adding nitrogen-rich materials) this should be followed by an equal amount of carbon-rich materials.
  • Many schools produce a lot of fruit waste, especially in the younger classes, and this needs particular attention as it has a high water content which can create a soggy mess if it’s not balanced with appropriate materials and aerated well.  Sawdust works well as a biofilter to absorb unpleasant smells. Fruit waste and sawdust should be added in thin layers and mixed well.
  • It’s a good idea if someone can keep the composting going during holidays by taking waste from home every couple of days so the bin continues to be fed.
  • Teach children that micro-organisms are living creatures, and the composting process is all about nurturing them.
  • Our blog – Compost School – a guide for absolute beginners – is a useful aid for lesson planning. It’s written simply for children to understand but is also aimed at anyone who may not have composted before.
  • Master composters are people who are passionate about composting and have trained as volunteers to share their composting knowledge. They visit schools and groups to offer advice. Check with Garden Organic – www.gardenorganic.org.uk – to see if there are any in your area.

If all goes well, your composting project can expand to compost even more waste by using several compost bins or a Ridan giant tumbler, which has a cog and gear system that makes the handle easier to turn.

 Get a ‘compost chief’!

Projects involving a lot of people can hit problems if composting methods are not followed by everyone.

Occasionally, Green Johannas have been used in schools as general wastebins for food waste, without the necessary balance with carbon-rich materials, and this has inevitably led to problems. This has usually been the result of there not being a nominated ‘compost chief’ in charge.

Disappointing experiences give the impression that composting doesn’t work, which isn’t the case, so we are keen to help where we can.

What about the Green Cone?  

If you think a Green Cone Food Waste Digester might suit your aims, consider the following points:

  • You need a sunny spot in well-draining soil (not clay or chalk) where you can dig the hole required for the Cone’s underground basket.
  • One Green Cone can accept the food waste of the average family of four – about 1kg per day.
  •  Food waste lands in the underground basket; once the underground basket is full, you should stop adding waste until there is space in the basket for more.
  • Regular additions of accelerator powder are recommended – aim to use one sachet per month. Accelerator powder contains beneficial bacteria which digest the waste and boost the breakdown process.
  • As this is a food waste digester rather than a composter, no compost is produced. Instead, a nutrient-rich liquid seeps from the Cone’s underground basket and feeds surrounding soil.
  • The Green Cone doesn’t accept garden waste or paper waste.

Helpful advice

Some people are put off composting because of a fear of pests, but there are steps you can take to make a compost bin and the surrounding area so unattractive to unwanted visitors that they will go somewhere else instead. Read our blogs about how to deter pests and flies.  

How we can help

We are keen to support community composting projects. We can send you several copies of the instruction manuals for the Green Johanna and Green Cone so they can be shared out, as well as colourful A3-size posters about the Green Johanna.   Contact us at [email protected].

The book that will keep you composting

You might expect anything written about composting to be down to earth (pun intended) but if you read a lot on the subject, as we do, you’ll know that’s not always the case.

Sometimes you come away from an article thinking you must need a PhD to compost. You wonder how Mother Nature manages without the aid of a spreadsheet and calculator for tracking temperatures and working out ratios. If spreadsheets and calculators are your thing, don’t let us stop you (some of the GGS team are guilty as charged).

But most of us just want simple advice we can follow. That’s why at Great Green Systems we often point customers towards Master Composter Rod Weston’s website (carryoncomposting.com) because it offers straight-forward, practical guidance. So we were delighted to learn that Rod has turned his knowledge into a book.

The Great Green team love this book and anyone who is into composting, or could be with a little encouragement, will love it too. It gives the lowdown on just about every compost bin going so it helps you to understand your own bin better or to choose one that will work best for you.

Rod hopes the book will encourage householders to compost their organic waste ‘and most importantly, to continue composting.’ He acknowledges that people new to composting may encounter various problems while trying to master the craft, but by showing different techniques to deal with issues he hopes to help new recruits to persevere.

‘The key message is to keep composting, whatever style you adopt,’ he says. ‘All techniques can be modified to suit your own particular circumstances.’

He also hopes to encourage groups to set up small-scale community composting on allotments, at schools, and on community gardens. He points out that if garden and catering waste can be dealt with on site, the environmental costs of transporting it to a central location for processing can be avoided.

We recently paid Rod a visit at the Stokes Wood Allotment site in Leicester, which includes a demonstration site that is home to every composter you can think of. Rod demonstrates different bins and techniques to the public.  

The site provides a community composting service for allotment plot holders and also takes food waste from the café on site. Plot holders leave their waste for composting in designated spots and can take compost (and liquid feed) for their own use when it’s ready.

Working bays and bins at Stokes Wood Allotments composting demonstration site

Rod’s book also explains the idea behind the Master Composters scheme. In 2004 around 40 per cent of householders who had started home composting gave up because of a lack of knowledge. Almost two decades later, councils and others now produce information and train Master Composters to provide support. This has resulted in a reduction in the dropout rate to between 8 and 14 per cent. In more recent years this has reduced again to 3.9 per cent. Obviously the scheme has been a great success.

Like many of his generation, as a child Rod helped his father on his allotment ‘in the days when allotments were an important piece of ground that played a major role in providing fruit and vegetables for the family’.  

Before becoming interested in the environmental aspects of composting, Rod initially composted on his own allotment in order to dispose of garden waste and to use the compost produced as a soil improver. He says it was his wife who first became interested in becoming a Master Composter ‘but then suggested it to me because she thought it would keep me off the streets!’

On our visit we loved talking to Rod about all aspects of composting. It’s so refreshing in this world of uncompromising opinions to hear his relaxed straight-forward views. Like us he’s pleasantly obsessed but not a purist. Rod’s attitude is that we can all compost – you just have to find a system and bin that works for you.  The more people who compost the better it is for all of us and for the planet.

Anyone living in or around Leicester is lucky to have easy access to his talks and demonstrations.

‘If you are interested and want to get involved with your bin, go for hot composting. If you’re lazy or too busy, just go for a cold system,’ he says.

He goes about the business of promoting composting in a practical, fun way, giving talks to garden clubs, allotment societies and schools.  For school visits, when talking about wormeries he takes along some slugs and snails as well as worms, knowing his audience will approve.

Other props are a soft toy rat and dog poo (spoiler alert – it’s fake) which is used to explain the workings of a wormery used for dog poo.

Sitting pretty – on the dog poo wormery

He thinks composting will become more popular as more local authority food waste collections come into operation, since a lot of people could prefer to compost their food waste in their gardens rather than having it waiting for collection by the council.

Rod is a fan of the Green Johanna and has a couple at home as well as one on the site.

‘It just sits there quietly and gets on with its job, breaking stuff down, with no trouble,’  he says approvingly.

Rod told us that badgers from a nearby wood had recently made a nocturnal visit and tried to get into the site’s Green Johanna, but failed.

We inspected the teeth marks on the Johanna’s lid and Insulating Jacket, proud that the Johanna had stood firm. And this Johanna is 13 years old.

Rod shows Mark evidence of the failed badger attack

The site also demonstrates an old Green Cone, which Rod says has never needed emptying or cleaning.

Apparently the number one problem with Green Cones that people ask him about is caused by the owner not having read the instruction manual properly. The manual states that food waste should never come higher than the top of the Cone’s underground basket, so there should never be food waste inside the Cone itself, which is above ground level.  Rod said he has seen Cones that have been filled right to the top like a composter, which would not be a great problem to have to sort out.

How a Green Cone should work – with food waste only in the underground basket

We appreciated this insight and we intend to make this point much clearer in the next edition of the Green Cone manual so that no one can possibly miss it. Although it’s obviously not much good if people don’t read the manual.

In his book, Rod says: ‘There are almost as many ways of composting as there are composters and, despite what might be read online, there is no single right way of doing anything. If what you are doing works, it must be right for you, although, of course, the method may be open to improvement. The main thing is to enjoy your composting in the knowledge that, while you are improving your soil to produce better crops, you are also, in a small way, helping to save the planet. ‘

Wise words from a Master (Composter).

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